--- title: "Letterhead" url: "https://getknit.dev/ipaas-connectors/letterhead/" date: "2026-09-23T12:00:08+00:00" modified: "2026-09-23T17:22:51+00:00" type: "agent_app" --- # Letterhead [iPaaS Connectors](https://getknit.dev/ipaas-connectors) / [Email Marketing](https://getknit.dev/ipaas-connectors-categories/email-marketing-connectors/) / Letterhead ![Letterhead](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg)Letterhead Integrations ======================= Put Letterhead to work with AI and enterprise-grade automation Try: Letterhead → Claude Letterhead → Snowflake Letterhead → Admiral [Learn more about the Integrations Agent](/products/integrations-agent/) or [talk to a human](/book-demo) Trusted by teams already building on Knit·![4.9 out of 5 stars](https://getknit.dev/wp-content/themes/knit/assets/images/g2/g2-star-rating.svg)4.9/5 on G2·![Google](https://getknit.dev/wp-content/themes/knit/assets/images/investor-logos/google-g.png)Google for Startups Accelerator ![prismforce](https://storage.googleapis.com/knit-website-media/2026/08/6a1eebbdaa38eb74c2d39fc9_prismforce-1.svg)![Hackerearth](https://storage.googleapis.com/knit-website-media/2026/08/6a1eeb591e00bd216f61488b_hackerearth-1.svg)![Isotopes AI](https://storage.googleapis.com/knit-website-media/2026/08/691596a13b8cd38e2f3dc822_isotopes_ai_greyscale-1.svg)![Infojobs](https://storage.googleapis.com/knit-website-media/2026/08/68fc54d2ee31fc7f0e2f7ce1_infojobs_bnw-1.svg)![Payoneer](https://storage.googleapis.com/knit-website-media/2026/08/payoneer.png)![Outsolve](https://storage.googleapis.com/knit-website-media/2026/08/683469796fef776e21802928_outsolve-1.svg)![Skuad](https://storage.googleapis.com/knit-website-media/2026/08/68346986ac834ab404bc57d8_Skuad-1.svg)![Payworks](https://storage.googleapis.com/knit-website-media/2026/08/6879e68c044e681ac17de2b8_payworks_logo-1.svg)![Itilite](https://storage.googleapis.com/knit-website-media/2026/08/itilite.svg)![Onsurity](https://storage.googleapis.com/knit-website-media/2026/08/onsurity.svg)![RazorpayX](https://storage.googleapis.com/knit-website-media/2026/08/razorpay.png)![Multiplier](https://storage.googleapis.com/knit-website-media/2026/08/multiplier.svg)![Peoplestrong](https://storage.googleapis.com/knit-website-media/2026/08/68346a01a0576f307fa7b51c_people-strong-1.svg)![Scrut](https://storage.googleapis.com/knit-website-media/2026/08/scrut.svg)![Ceipal](https://storage.googleapis.com/knit-website-media/2026/08/ceipal.svg) Apps Letterhead connects with ----------------------------- Apps already live on Knit alongside Letterhead. Where there's a pre-built pairing you'll land on every automation between the two — otherwise the tile opens that app's own page. [ ![](https://storage.googleapis.com/knit-website-media/2026/09/admiral-avatar.svg) Admiral Marketing ](https://getknit.dev/ipaas-connectors/letterhead/admiral/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/googleforms-logo.svg) Google Forms Forms & Surveys ](https://getknit.dev/ipaas-connectors/letterhead/google-forms/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/mailchimp-logo-2.svg) Mailchimp Marketing Automation ](https://getknit.dev/ipaas-connectors/letterhead/mailchimp/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/donorbox-avatar.svg) Donorbox Fundraising ](https://getknit.dev/ipaas-connectors/letterhead/donorbox/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/chatgpt-avatar.svg) ChatGPT AI Assistants & Chatbots ](https://getknit.dev/ipaas-connectors/letterhead/chatgpt/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/wordware-avatar.svg) Wordware AI Models ](https://getknit.dev/ipaas-connectors/wordware/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/cohereai-avatar.svg) Cohere AI AI Models ](https://getknit.dev/ipaas-connectors/cohere-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/mistralai-logo.svg) Mistral AI AI Models ](https://getknit.dev/ipaas-connectors/mistral-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/replicate-logo.svg) Replicate AI Models ](https://getknit.dev/ipaas-connectors/replicate/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/pipelessrecommendations-avatar.svg) Pipeless Recommendations AI Models ](https://getknit.dev/ipaas-connectors/pipeless-recommendations/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/clerk-logo.svg) Clerk AI Models ](https://getknit.dev/ipaas-connectors/clerk/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/exaai-avatar.svg) Exa AI AI Models ](https://getknit.dev/ipaas-connectors/exa-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/deepseek-logo.svg) DeepSeek AI Models ](https://getknit.dev/ipaas-connectors/deepseek/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/hatzai-avatar.svg) Hatz AI AI Models ](https://getknit.dev/ipaas-connectors/hatz-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/teamai-avatar.svg) TeamAI AI Models ](https://getknit.dev/ipaas-connectors/teamai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/humeai-avatar.svg) Hume AI AI Models ](https://getknit.dev/ipaas-connectors/hume-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/platerecognizer-avatar.svg) Platerecognizer AI Models ](https://getknit.dev/ipaas-connectors/platerecognizer/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/stackai-avatar.svg) Stack AI AI Models ](https://getknit.dev/ipaas-connectors/stack-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/leapai-avatar.svg) Leap AI AI Models ](https://getknit.dev/ipaas-connectors/leap-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/promptly-avatar.svg) Promptly AI Models ](https://getknit.dev/ipaas-connectors/promptly/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/flowiseai-avatar.svg) FlowiseAI AI Models ](https://getknit.dev/ipaas-connectors/flowiseai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/azureopenai-avatar.svg) Azure OpenAI AI Models ](https://getknit.dev/ipaas-connectors/azure-openai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/assemblyai-avatar.svg) AssemblyAI AI Models ](https://getknit.dev/ipaas-connectors/assemblyai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/deepgram-logo.svg) Deepgram AI Models ](https://getknit.dev/ipaas-connectors/deepgram/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/oneai-avatar.svg) One AI AI Models ](https://getknit.dev/ipaas-connectors/one-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/edenai-avatar.svg) Eden AI AI Models ](https://getknit.dev/ipaas-connectors/eden-ai/) [ ![](https://storage.googleapis.com/knit-website-media/2026/09/grokbyxai-avatar.svg) Grok by xAI AI Models ](https://getknit.dev/ipaas-connectors/grok-by-xai/) No Letterhead connector? The Agent builds one. ---------------------------------------------- Web search for Letterhead's public API docs, or hand over your own — either way, the Agent researches the real API surface and ships a working connector. [Try Knit Free](https://agent.getknit.dev/) Not a block library. Real code. ------------------------------- Legacy automation tools like Zapier, Workato, and Make hand you a fixed library of pre-built steps to drag, drop, and configure around the edges. Knit's Integrations Agent writes real, custom Letterhead integration code for your exact logic. Legacy iPaaS - Fixed library of pre-built steps — drag, drop, configure around the edges - Capped by whatever the vendor's already built - AI features bolted on after the fact Knit Integrations Agent - Real, inspectable code for your exact Letterhead logic - Auto-builds a missing Letterhead connector itself - Native LLM connectors built in, not bolted on Prompt "When a new lead is created in HubSpot, add them as a subscriber in Letterhead." ``` from knit import Knit client = Knit(api_key=KNIT_API_KEY) @client.on("new-subscriber-added") def add_or_update_a_subscriber(event): return client.email_marketing.add_or_update_a_subscriber( integration_id=LETTERHEAD_INTEGRATION_ID, record_id=event["id"], fields={ "source": "Letterhead", "synced_at": event["updated_at"], }, # ...maps the event to a real "Add or update a subscriber" call ) ``` Example: illustrative of what the Agent generates from a plain-English prompt — real, inspectable, and yours to edit. Skip the engineering. Ship the workflows. ----------------------------------------- ### See what you can build with Letterhead on Knit [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Admiral logo](https://storage.googleapis.com/knit-website-media/2026/09/admiral-avatar.svg) Letterhead → Admiral When a new email is verified in Admiral, add or update the audience member in Letterhead. ](https://getknit.dev/ipaas-connectors/letterhead/admiral/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Google Forms logo](https://storage.googleapis.com/knit-website-media/2026/09/googleforms-logo.svg) Letterhead → Google Forms When a new response is submitted in Google Forms, instantly add the content to Letterhead curations. ](https://getknit.dev/ipaas-connectors/letterhead/google-forms/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Mailchimp logo](https://storage.googleapis.com/knit-website-media/2026/09/mailchimp-logo-2.svg) Letterhead → Mailchimp When new or updated audience members are detected in Letterhead, create or update subscriber contacts in Mailchimp. ](https://getknit.dev/ipaas-connectors/letterhead/mailchimp/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Donorbox logo](https://storage.googleapis.com/knit-website-media/2026/09/donorbox-avatar.svg) Letterhead → Donorbox When content or contact updates happen in Letterhead, sync subscriber details to Donorbox. ](https://getknit.dev/ipaas-connectors/letterhead/donorbox/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Admiral logo](https://storage.googleapis.com/knit-website-media/2026/09/admiral-avatar.svg) Letterhead → Admiral When a new email is verified in Admiral, add or update the audience member in Letterhead. ](https://getknit.dev/ipaas-connectors/letterhead/admiral/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Google Forms logo](https://storage.googleapis.com/knit-website-media/2026/09/googleforms-logo.svg) Letterhead → Google Forms When a new response is submitted in Google Forms, instantly add the content to Letterhead curations. ](https://getknit.dev/ipaas-connectors/letterhead/google-forms/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Mailchimp logo](https://storage.googleapis.com/knit-website-media/2026/09/mailchimp-logo-2.svg) Letterhead → Mailchimp When new or updated audience members are detected in Letterhead, create or update subscriber contacts in Mailchimp. ](https://getknit.dev/ipaas-connectors/letterhead/mailchimp/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Donorbox logo](https://storage.googleapis.com/knit-website-media/2026/09/donorbox-avatar.svg) Letterhead → Donorbox When content or contact updates happen in Letterhead, sync subscriber details to Donorbox. ](https://getknit.dev/ipaas-connectors/letterhead/donorbox/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![ChatGPT logo](https://storage.googleapis.com/knit-website-media/2026/09/chatgpt-avatar.svg) Letterhead → ChatGPT When content curation events occur in Letterhead, send the text to ChatGPT (OpenAI) for automated summarization. ](https://getknit.dev/ipaas-connectors/letterhead/chatgpt/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Wordware logo](https://storage.googleapis.com/knit-website-media/2026/09/wordware-avatar.svg) Letterhead → Wordware When something happens in Letterhead, use Wordware to summarize it or draft a reply. ](https://getknit.dev/ipaas-connectors/letterhead/wordware/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Cohere AI logo](https://storage.googleapis.com/knit-website-media/2026/09/cohereai-avatar.svg) Letterhead → Cohere AI When something happens in Letterhead, use Cohere AI to summarize it or draft a reply. ](https://getknit.dev/ipaas-connectors/letterhead/cohere-ai/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Mistral AI logo](https://storage.googleapis.com/knit-website-media/2026/09/mistralai-logo.svg) Letterhead → Mistral AI When something happens in Letterhead, use Mistral AI to summarize it or draft a reply. ](https://getknit.dev/ipaas-connectors/letterhead/mistral-ai/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![ChatGPT logo](https://storage.googleapis.com/knit-website-media/2026/09/chatgpt-avatar.svg) Letterhead → ChatGPT When content curation events occur in Letterhead, send the text to ChatGPT (OpenAI) for automated summarization. ](https://getknit.dev/ipaas-connectors/letterhead/chatgpt/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Wordware logo](https://storage.googleapis.com/knit-website-media/2026/09/wordware-avatar.svg) Letterhead → Wordware When something happens in Letterhead, use Wordware to summarize it or draft a reply. ](https://getknit.dev/ipaas-connectors/letterhead/wordware/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Cohere AI logo](https://storage.googleapis.com/knit-website-media/2026/09/cohereai-avatar.svg) Letterhead → Cohere AI When something happens in Letterhead, use Cohere AI to summarize it or draft a reply. ](https://getknit.dev/ipaas-connectors/letterhead/cohere-ai/) [ ![Letterhead logo](https://storage.googleapis.com/knit-website-media/2026/09/letterhead-avatar.svg) ![Mistral AI logo](https://storage.googleapis.com/knit-website-media/2026/09/mistralai-logo.svg) Letterhead → Mistral AI When something happens in Letterhead, use Mistral AI to summarize it or draft a reply. ](https://getknit.dev/ipaas-connectors/letterhead/mistral-ai/) [Browse all workflow recipes →](/integration-workflows/) See the APIs & webhooks enabling Letterhead Integrations ------------------------------------------------------------ ### The real endpoints Knit's Agent can call to turn a plain-English use case into working Letterhead Integration code Add Content to Curations Add a URL to a post, page, or other piece of content on the web to save to your curations library, which will make it easier to compose your newsletter. Add or Update Contact Add a contact to your company-wide audience, or update an existing one. Identified by email — if the contact already exists, their details are updated. Optionally set the contact's subscription status on one or more channels. Requires a company-level API key. Add Contact to Tag Add a Letterhead tag to a contact in your company-wide audience, identified by email. Requires a company-level API key, and a company-wide audience that is switched on for your account. Remove Contact From Tag Remove a Letterhead tag from a contact in your company-wide audience, identified by email. Requires a company-level API key, and a company-wide audience that is switched on for your account. Other Email Marketing Connectors -------------------------------- [ ![ManyReach](https://storage.googleapis.com/knit-website-media/2026/09/manyreach-avatar.svg)### ManyReach A cold email outreach software that automates email campaigns, manages sender domains, and improves inbox deliverability. ](https://getknit.dev/ipaas-connectors/manyreach/) [ ![Spotler Mail+](https://storage.googleapis.com/knit-website-media/2026/09/spotlermail-avatar.svg)### Spotler Mail+ An email marketing platform that enables businesses to create, automate, and send targeted email newsletters and marketing campaigns. ](https://getknit.dev/ipaas-connectors/spotler-mail/) [ ![MailerCheck](https://storage.googleapis.com/knit-website-media/2026/09/mailercheck-avatar.svg)### MailerCheck An email deliverability and list verification tool that detects invalid email addresses to protect domain sender reputation. ](https://getknit.dev/ipaas-connectors/mailercheck/) [ ![Mailifier](https://storage.googleapis.com/knit-website-media/2026/09/mailifier-avatar.svg)### Mailifier Mailifier is an email verification and validation service that cleans email lists to improve deliverability and reduce bounce rates. ](https://getknit.dev/ipaas-connectors/mailifier/) [ ![Createsend](https://storage.googleapis.com/knit-website-media/2026/09/createsend-avatar.svg)### Createsend Createsend is an email marketing API service that allows businesses to build, send, and manage email campaigns and subscriber lists. ](https://getknit.dev/ipaas-connectors/createsend/) [ ![SendMails](https://storage.googleapis.com/knit-website-media/2026/09/sendmails-avatar.svg)### SendMails SendMails is an email marketing platform that enables users to build automated email campaigns, manage contact lists, and track deliverability. ](https://getknit.dev/ipaas-connectors/sendmails/) [ ![OHWO](https://storage.googleapis.com/knit-website-media/2026/09/ohwo-avatar.svg)### OHWO OHWO is a business messaging tool used to create, deliver, and manage transactional email communications. ](https://getknit.dev/ipaas-connectors/ohwo/) [ ![Vero](https://storage.googleapis.com/knit-website-media/2026/09/vero-avatar.svg)### Vero An email messaging platform that helps businesses send targeted customer communications based on behavioral user data. ](https://getknit.dev/ipaas-connectors/vero/) [ ![Enormail](https://storage.googleapis.com/knit-website-media/2026/09/enormail-avatar.svg)### Enormail Enormail is an email marketing platform designed for creating, sending, and managing subscriber newsletters and promotional campaigns. ](https://getknit.dev/ipaas-connectors/enormail/) [ ![FireDrum Email Marketing](https://storage.googleapis.com/knit-website-media/2026/09/firedrumemailmarketing-avatar.svg)### FireDrum Email Marketing An email marketing service that enables businesses to create, send, and track automated email campaigns and newsletters. ](https://getknit.dev/ipaas-connectors/firedrum-email-marketing/) [ ![SMASHSEND Email Marketing](https://storage.googleapis.com/knit-website-media/2026/09/smashsendemailmarketing-avatar.svg)### SMASHSEND Email Marketing Email marketing software that helps businesses design, send, and track promotional email campaigns and newsletters. ](https://getknit.dev/ipaas-connectors/smashsend-email-marketing/) [ ![Buttondown](https://storage.googleapis.com/knit-website-media/2026/09/buttondown-avatar.svg)### Buttondown Buttondown is an email newsletter service designed for independent creators to write, distribute, and monetize published content. ](https://getknit.dev/ipaas-connectors/buttondown/) [ ![Kirim.Email](https://storage.googleapis.com/knit-website-media/2026/09/kirimemail-avatar.svg)### Kirim.Email Kirim.Email is an email marketing platform designed to help businesses send broadcasts, manage subscriber lists, and automate campaigns. ](https://getknit.dev/ipaas-connectors/kirim-email/) [ ![EmailListVerify](https://storage.googleapis.com/knit-website-media/2026/09/emaillistverify-avatar.svg)### EmailListVerify EmailListVerify is an email verification platform that validates mailing lists to improve deliverability and reduce bounce rates. ](https://getknit.dev/ipaas-connectors/emaillistverify/) [ ![Campayn](https://storage.googleapis.com/knit-website-media/2026/09/campayn-avatar.svg)### Campayn An email marketing application that allows businesses to create, send, and track graphical newsletter campaigns and mailing lists. ](https://getknit.dev/ipaas-connectors/campayn/) [ ![Emelia](https://storage.googleapis.com/knit-website-media/2026/09/emelia-avatar.svg)### Emelia Emelia is a cold email platform that helps businesses create, automate, and track outbound email campaigns. ](https://getknit.dev/ipaas-connectors/emelia/) [ ![Wavo](https://storage.googleapis.com/knit-website-media/2026/09/wavo-avatar.svg)### Wavo Wavo is an email outreach and automation tool that helps businesses send personalized drip campaigns and manage sales communication. ](https://getknit.dev/ipaas-connectors/wavo/) [ ![Instiller](https://storage.googleapis.com/knit-website-media/2026/09/instiller-avatar.svg)### Instiller An email marketing and delivery platform built for agencies and software companies to send customer campaigns. ](https://getknit.dev/ipaas-connectors/instiller/) [ ![Cakemail](https://storage.googleapis.com/knit-website-media/2026/09/cakemail-avatar.svg)### Cakemail Cakemail is an email marketing platform that helps small businesses create, send, and track email campaigns and newsletters. ](https://getknit.dev/ipaas-connectors/cakemail/) [ ![TrueMail](https://storage.googleapis.com/knit-website-media/2026/09/truemail-avatar.svg)### TrueMail TrueMail is an email verification service that cleans contact lists by checking email address validity and removing invalid addresses. ](https://getknit.dev/ipaas-connectors/truemail/) [ ![dibbi](https://storage.googleapis.com/knit-website-media/2026/09/dibbi-avatar.svg)### dibbi dibbi is an email newsletter publishing platform that helps creators write, send, and monetize digital newsletter content. ](https://getknit.dev/ipaas-connectors/dibbi/) [ ![Mailvio](https://storage.googleapis.com/knit-website-media/2026/09/mailvio-avatar.svg)### Mailvio Mailvio is an email marketing tool that offers automated campaign management, contact segmentation, and email deliverability tracking. ](https://getknit.dev/ipaas-connectors/mailvio/) [ ![e-shot](https://storage.googleapis.com/knit-website-media/2026/09/eshot-avatar.svg)### e-shot e-shot is an email marketing platform designed to help organizations send targeted newsletters and automated communication campaigns. ](https://getknit.dev/ipaas-connectors/e-shot/) [ ![INBOX](https://storage.googleapis.com/knit-website-media/2026/09/inbox-avatar.svg)### INBOX INBOX is an email platform that enables businesses to create, execute, and analyze email marketing campaigns. ](https://getknit.dev/ipaas-connectors/inbox/) [See all Email Marketing Connectors](https://getknit.dev/ipaas-connectors-categories/email-marketing-connectors/) Enterprise-grade security ------------------------- ![SOC 2 certified](/wp-content/themes/knit/assets/images/security-logos/soc2-fallback.png) ![GDPR compliant](/wp-content/themes/knit/assets/images/security-logos/gdpr-fallback.png) ![ISO 27001 certified](/wp-content/themes/knit/assets/images/security-logos/iso.png) [Visit our Security Center](https://compliance.getknit.dev/) [Review the DPA](/dpa) Customer Stories ---------------- See how leading technology firms are scaling their operations ![Multiplier](https://storage.googleapis.com/knit-website-media/2026/08/multiplier.svg)[Case Study ](https://getknit.dev/case-studies/multiplier-closes-enterprise-deals-by-shipping-a-workday-integration-in-one-week-through-knit/) > Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude. HHuynh H Developer, Multiplier ![Scrut](https://storage.googleapis.com/knit-website-media/2026/08/scrut.svg)[Case Study ](https://getknit.dev/case-studies/how-scrut-automation-automates-grc-automation-with-knits-unified-hris-api/) > A brilliant tool to let you seamlessly integrate with many different systems. It is very easy to integrate with and customer support is next level. JJayesh Co-Founder, Scrut ![Onsurity](https://storage.googleapis.com/knit-website-media/2026/08/onsurity.svg) > Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support. PPoorvi Product Manager, Onsurity ![RazorpayX](https://storage.googleapis.com/knit-website-media/2026/08/razorpay.png)[Case Study ](https://getknit.dev/case-studies/razorpayx-payroll-unlocks-multi-entity-pay-runs-with-knits-unified-hrms-api/) > Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development. AAditya Product Lead, RazorpayXPayroll ![Payoneer](https://storage.googleapis.com/knit-website-media/2026/08/payoneer.png)[Case Study ](https://getknit.dev/case-studies/payoneer-workforce-management-launches-a-global-hris-to-netsuite-bridge-for-clients-using-knits-unified-api/) > Knit shipped a brand-new Timesheet API in a week and handed us a ready-to-use NetSuite sandbox. That velocity is priceless when you're running payroll in 40+ countries. RRohit Singh GM, Payoneer Workforce Management \#1 in Ease of Integrations --------------------------- ![4.9 out of 5 stars](/wp-content/themes/knit/assets/images/g2/g2-star-rating.svg) 4.9 out of 5 stars on G2 ![G2 Leader, Spring 2026](/wp-content/themes/knit/assets/images/g2/g2-leader.svg)![G2 Fastest Implementation, Spring 2026](/wp-content/themes/knit/assets/images/g2/g2-fastest-implementation.svg)![G2 High Performer, Spring 2026](/wp-content/themes/knit/assets/images/g2/g2-high-performer.svg)![G2 Best Est. ROI, Spring 2026](/wp-content/themes/knit/assets/images/g2/g2-best-roi.svg) FAQCommon questions about the Letterhead automation ------------------------------------------------ Is there a pre-built Letterhead automation?Not yet — Letterhead isn't in Knit's Unified API or MCP Servers catalog today, so there's no pre-built connector for it either. The Integrations Agent can build the real automation (and the connector powering it) on demand instead of you waiting on our roadmap. How does the Agent actually build the Letterhead connector?It researches Letterhead's real public API documentation — authentication, endpoints, data schema — and writes a working connector against that real surface. You can also upload your own docs if Letterhead's aren't public. How long does it take?Minutes to build a first working version, not weeks — you test it against real Letterhead data before it goes anywhere near production. What happens after the Agent builds it?You own it. It runs the same way any Knit-built connector does — you are not left maintaining hand-rolled integration code yourself. Could Letterhead become a real pre-built connector later?Yes — as apps get built and used through the Agent, the highest-demand ones are natural candidates to join the pre-built Unified API/MCP Servers catalog directly. [See all FAQs](/faq) Put Integrations on Autopilot. Talk to Experts. ----------------------------------------------- Knit is loved by customers across the globe due to our seamless product and white glove support. You'll love us too! [Talk to a Human](/book-demo)