Dev tools · alternatives · 2026
24 alternatives to SignatureAPI – Electronic Signature API
Hey HN! Victor here from SignatureAPI (https://signatureapi.com) SignatureAPI is an electronic signature platform via API. Our customers use SignatureAPI to add electronic signatures to their apps and workflows. SignatureAPI was born out of the frustration of a friend of mine who needed to integrate electronic signatures into his app, but found Docusign API, at $1+ per envelope, too expensive for his use case. We quickly realized that many others shared this same frustration. We are different from other platforms such as Docusign, Dropbox Sign, Adobe Sign, etc in two key ways: 1.…
SignatureAPI is an electronic signature platform designed as an API-first solution for developers who need to add digital signatures to their applications and workflows. It serves software companies and developers… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. SignatureAPI – Electronic Signature API launched in 2024; newer entries below may have overtaken it.
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Firma.dev▲310E-signatures API for your app averaging ~3¢ per envelope
Jun 2026 · firma.dev · its alternatives →
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Documenso▲760Enterprise-Grade Signature Infrastructure for Everyone
2023 · documenso.com · its alternatives →
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SignHouse▲244Create an electronic signature: legally binding and free
2023 · usesignhouse.com · its alternatives →
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Autonomous AI for smarter e-signatures
Dec 2025 · marketplace.microsoft.com · its alternatives →
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Woke up today with a 100-degree fever & found out Google is now our competitor. Last week, we started building signwith.co/ - a simple, pay-per-use e-signature tool for people who are struggling with complex e-sign tools. The plan was to build quietly, run a private beta, get 50 users in 15 days, and then do a launch. Easy peasy. But since Google dropped into the e-signature space - we needed to talk. So after 30 minutes of existential dread, a lot of “what are we even doing?” thoughts, and one strong dose of paracetamol we said, screw it. - let’s change gears. So now we're opening our…
2024 · signwith.co · its alternatives →
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Sign yourself or get documents signed. Easy, secure, legally binding and free.
2017 · signrequest.com · its alternatives →
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Create a free downloadable electronic signature
2019 · signwell.com · its alternatives →
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Hi HN, I built Signbee while working on AI agents that handle contracting workflows. The agents could draft agreements, negotiate terms, manage deals — but the moment a signature was needed, the workflow broke. It always ended with "please upload this to DocuSign" — which meant human intervention, account setup, and manual uploads. So I built a simple API. You POST markdown and Signbee generates the PDF, or you pass a URL to your own PDF if you already have one designed the way you want it. No templates, no editor. Either way, it verifies both parties via email OTP and produces a signed…
Mar 2026 · signb.ee · its alternatives →
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Simple, intuitive and binding e-signatures, absolutely free
2021 · useanvil.com · its alternatives →
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Enterprise-Level Document Signing Goes Open-Source
2023 · opensignlabs.com · its alternatives →
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Cloud based platform for electronic signatures
2021 · documentesign.com · its alternatives →
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Effortlessly create your perfect digital signature
2024 · ai-signaturegenerator.com · its alternatives →
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Discover OpenSign™, the leading open-source DocuSign alternative for secure & reliable PDF document signing. Our platform offers state-of-the-art encryption, a user-friendly interface & robust API support, making it the go-to solution for individuals and businesses seeking an open-source alternative
2023 · opensignlabs.com · its alternatives →
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The First AI-Powered Handwritten Signature Tool! ✍️🤖
2023 · ai-signature-generator.compromath.com · its alternatives →
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Integrate hassle-free eSignature experiences into your apps
2022 · signnow.com · its alternatives →
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Create free electronic signature for signing document online
2021 · hellobonsai.com · its alternatives →
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Add eSignatures to your apps with a simple REST API
Aug 2026 · esignature-api.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →