Firma.dev
Summary
Firma.dev offers an e-signatures API at an average cost of 3 cents per envelope for developers.
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Documenso pitches itself as a cheaper open-source alternative to DocuSign, offering team plans at $50/month with no fixed envelope quota and API access.
SignWith
SignWith 推出按文档付费的电子签名服务,无需订阅,免费签 3 份文档/月,之后可购买一次性信用包,并支持通过 API 与 MCP 在 Claude、ChatGPT 等 AI 助手中使用。
Formesign
Formesign is a product that adds legally binding eSignatures to Google Forms, allowing users to sign on any device with signed PDFs emailed and saved to Drive, while responses sync to Sheets.
TapSign
TapSign is a product for sending, signing, and managing documents easily.
esigna
esigna is an email signature design studio launched on Product Hunt, offering 26 original templates and a visual editor to customize signatures with light, dark, and mobile previews before copying into Gmail, Outlook, or Apple Mail.