Lob
Sales outreachA print-and-mail API for letters, postcards, self-mailers and checks, with address verification. The Developer plan has no subscription fee; you pay print and postage per piece.
API/CLIFile import
Sales
Handwrytten
Sales outreach Sales MCPAPI/CLIFile import
Independent review. IonBin has no partnership with Handwrytten and was not paid for this page. Our evaluation is our own, based on public documentation and our research. Product names are trademarks of their owners and are used for identification only. How disclosure works.
Robot-written cards and notes in real pen, ordered one at a time or in baskets through an API, with a Claude connector listed on its site. Business plans include API access.
Best for
- Small batches of personal thank-you or intro notes
- Mail you have approved one by one
Not for
- Mass mailings where a printed letter is cheaper
- Messages you haven't read before they're sent
Top use cases
- Place a single-step card order through the API source ↗
- Queue several cards in a basket and send them together source ↗
- Ask Claude to pick a card and draft the message, with handwriting previews source ↗
In depth
API
Use an API key for new integrations; legacy password sign-in is deprecated. The API supports orders, baskets and catalog queries. Test mode accepts orders without fulfillment and authorizes payments without capturing them, so a temporary pending authorization can still appear. source ↗
Claude connector
The official tutorial documents a remote MCP server and account authorization in Claude. It recommends checking the message, addresses, basket price, postage and send date before explicitly ordering; previews are a review step, not a guarantee against incorrect mail. source ↗
Pricing
Retail cards cost $3.75 plus postage. Business Pro displays $449 monthly or a $374 monthly equivalent with annual billing, plus $1.99 per card and postage. The page footnote says monthly Business plans are billed every four weeks. Confirm the annual total and extras at checkout; domestic postage follows USPS rates and international orders have a manual-processing surcharge. source ↗
How to use it with AI
How Handwrytten connects to each AI platform: native connector or MCP, API through code the agent writes, browser control, or file upload.
| Platform | MCP / connector | API (agent-written code) | Browser | Upload / export |
|---|---|---|---|---|
| Claude (incl. Claude Code) | Not documented Claude connector. A named plugin, skill or CLI does not by itself establish an MCP/native connector pairing. Verify the route and client setup. Handwrytten named integration docs ↗Handwrytten MCP / connector evidence ↗Claude (incl. Claude Code) MCP docs ↗ | Not documented Claude (incl. Claude Code): Claude Code edits files and runs commands Handwrytten publishes an API, but this pairing still needs network, authentication and execution-scope checks. Handwrytten API ↗Claude (incl. Claude Code) docs ↗ | Inferred Claude Code with the Claude in Chrome extension (Chrome, Edge and other Chromium browsers). Handwrytten is a web app; the pairing itself is not documented. Claude (incl. Claude Code) browser docs ↗ | Not documented Verify which side exports and which imports, supported formats and permissions. Handwrytten's recorded upload/import status is yes; Claude (incl. Claude Code)'s file status is yes. These flags do not establish a file-transfer route. Handwrytten file docs ↗Claude (incl. Claude Code) file docs ↗ |
| OpenAI Codex | Not documented Handwrytten has an official MCP server and OpenAI Codex supports MCP, but Handwrytten's docs don't name this pairing. Auth setup may differ. Handwrytten MCP docs ↗OpenAI Codex MCP docs ↗ | Not documented OpenAI Codex: Edits files and runs commands locally; cloud tasks run in isolated workspaces Handwrytten publishes an API, but this pairing still needs network, authentication and execution-scope checks. Handwrytten API ↗OpenAI Codex docs ↗ | Inferred Only in the ChatGPT desktop app; not in the Codex CLI or IDE extension. Handwrytten is a web app; the pairing itself is not documented. OpenAI Codex browser docs ↗ | Not documented Verify which side exports and which imports, supported formats and permissions. Handwrytten's recorded upload/import status is yes; OpenAI Codex's file status is yes. These flags do not establish a file-transfer route. Handwrytten file docs ↗OpenAI Codex file docs ↗ |
| Google Antigravity | Not documented Handwrytten has an official MCP server and Google Antigravity supports MCP, but Handwrytten's docs don't name this pairing. Auth setup may differ. Handwrytten MCP docs ↗Google Antigravity MCP docs ↗ | Not documented Google Antigravity: Agents edit code and run tasks Handwrytten publishes an API, but this pairing still needs network, authentication and execution-scope checks. Handwrytten API ↗Google Antigravity docs ↗ | Inferred The /browser guide documents App and CLI support through Chrome DevTools MCP; the overview comparison conflicts on CLI availability. IDE browser features are separate. Handwrytten is a web app; the pairing itself is not documented. Google Antigravity browser docs ↗ | Not documented Verify which side exports and which imports, supported formats and permissions. Handwrytten's recorded upload/import status is yes; Google Antigravity's file status is yes. These flags do not establish a file-transfer route. Handwrytten file docs ↗Google Antigravity file docs ↗ |
Confirmed is reserved for evidence of the specific connection route. The current named integrations include plugins, skills and CLIs, so a named platform alone does not confirm MCP or a native connector. Inferred means each side documents a relevant capability, but no document describes the pairing. Code execution still needs network and credential access; file handling still needs a compatible format and transfer direction. Not documented means the records do not establish the route. IonBin has not tested these pairings. Recorded Oct 18, 2026.
Agent compatibility
MCPAPI/CLIFile import
| Level | Status | Detail / source |
|---|---|---|
| Native connector / MCP | Yes | Official docs ↗ — official remote MCP endpoint with account authorization and a documented Claude setup. |
| API / CLI | Yes | Official docs ↗ — API keys support orders, baskets and card catalog; login/password authentication is deprecated. |
| Browser / manual | No | Browser access is recorded alongside a documented programmatic route. |
| File upload / import | Yes | Official docs ↗ — Enterprise lists managed bulk uploads. API basket orders are a separate mechanism, not evidence of file import. |
Recorded Oct 18, 2026. Setup and plan limits vary; check the vendor's docs. How levels are assigned.
Appears in these proposed stacks
Connection capabilities to compare
An official MCP server is documented for this tool. These platforms separately document MCP client support: ChatGPT, Claude, Cursor, Gemini (Google), Google Antigravity, Grok, Grok Bot, Lindy, LM Studio, Mistral Vibe, OpenAI Codex. This inventory does not establish compatible transport, authentication or actions for a pairing. Check the connection matrix and linked sources.
Automation hubs to assess for a custom API connection: Gumloop, Make, n8n, Zapier. Verify credentials, supported requests, limits and error handling; no configured integration is implied.
Workflows using this tool
Review
No long-form review yet. Verdict is based on research, not hands-on testing.