What AI assistants actually recommend when buyers ask about open-source e-signature tools — measured weekly across 4 engines, published as open data.
Updated 2026-08-04 · 55 sampled answers · rolling 4-week window · methodology
Rankings are measured from sampled AI answers — never editorial, never paid. Orbator builds AI-visibility tooling; when Orbator itself appears in any category, it is measured by the same rules as everyone else.
Sample: 55 AI answers · Window: Jul 7, 2026 – Aug 4, 2026 (4-week rolling) · trend vs prior 4 weeks (36 answers)
Across 55 sampled AI answers from 4 engines, DocuSeal is recommended most often — appearing in 94.5% of recommendations, followed by OpenSign (90.9%) and Documenso (78.2%).
This is a measurement of share of voice across 4 AI engines — not an editorial pick. See the full ranking below.
| # | Product | Share | Trend | Engines | |
|---|---|---|---|---|---|
| 1 | DocuSeal docuseal.com | 94.5% 95% CI 85.1–98.1% 52 mentions · avg pos 3.6 first pick 50% | — | GEMINI 100%CHATGPT 100%CLAUDE 71.4%PERPLEXITY 95.2% | Claim |
| 2 | OpenSign opensignlabs.com | 90.9% 95% CI 80.4–96.1% 50 mentions · avg pos 4.6 first pick 4% | — | GEMINI 100%CHATGPT 100%CLAUDE 42.9%PERPLEXITY 95.2% | Claim |
| 3 | Documenso documenso.com Best for: AI recommends Documenso most when buyers ask “lightweight self-hosted e-signature alternatives to costly commercial signing platforms for small teams” (100% of those answers) | 78.2% 95% CI 65.6–87.1% 43 mentions · avg pos 4 first pick 9.3% | — | GEMINI 75%CHATGPT 100%CLAUDE 71.4%PERPLEXITY 76.2% | Claim |
| 4 | Signer Best for: AI recommends Signer most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (100% of those answers) | 67.3% 95% CI 54.1–78.2% 37 mentions · avg pos 5.9 first pick 27% | — | GEMINI 90%CHATGPT 71.4%CLAUDE 42.9%PERPLEXITY 52.4% | Claim |
| 5 | LibreSign libresign.coop Best for: AI recommends LibreSign most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (100% of those answers) | 58.2% 95% CI 45–70.3% 32 mentions · avg pos 7.5 first pick 0% | — | GEMINI 80%CHATGPT 85.7%CLAUDE 57.1%PERPLEXITY 28.6% | Claim |
| 6 | Docker docker.com Best for: AI recommends Docker most when buyers ask “best open-source e-signature tool I can self-host for signing contracts internally” (87.5% of those answers) | 56.4% 95% CI 43.3–68.6% 31 mentions · avg pos 3.8 first pick 35.5% | — | GEMINI 70%CHATGPT 100%CLAUDE 28.6%PERPLEXITY 38.1% | Claim |
| 7 | DocuSign docusign.com Best for: AI recommends DocuSign most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (100% of those answers) | 54.5% 95% CI 41.5–67% 30 mentions · avg pos 5.8 first pick 10% | — | GEMINI 40%CHATGPT 100%CLAUDE 42.9%PERPLEXITY 57.1% | Claim |
| 8 | Nextcloud nextcloud.com Best for: AI recommends Nextcloud most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (100% of those answers) | 54.5% 95% CI 41.5–67% 30 mentions · avg pos 8.2 first pick 0% | — | GEMINI 70%CHATGPT 85.7%CLAUDE 57.1%PERPLEXITY 28.6% | Claim |
| 9 | PostgreSQL postgresql.org Best for: AI recommends PostgreSQL most when buyers ask “best open-source e-signature tool I can self-host for signing contracts internally” (50% of those answers) | 27.3% 95% CI 17.3–40.2% 15 mentions · avg pos 10.1 first pick 40% | — | GEMINI 40%CHATGPT 42.9%PERPLEXITY 19% | Claim |
| 10 | MongoDB mongodb.com Best for: AI recommends MongoDB most when buyers ask “best open-source e-signature tool I can self-host for signing contracts internally” (37.5% of those answers) | 20% 95% CI 11.6–32.4% 11 mentions · avg pos 6.2 first pick 0% | — | GEMINI 25%CHATGPT 14.3%PERPLEXITY 23.8% | Claim |
| 11 | OpenSSL Best for: AI recommends OpenSSL most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (37.5% of those answers) | 18.2% 95% CI 10.2–30.3% 10 mentions · avg pos 3.1 first pick 0% | — | GEMINI 50% | Claim |
| 12 | Supersign supersign.cc Best for: AI recommends Supersign most when buyers ask “best self-hosted digital signature platform that meets legal eIDAS or ESIGN requirements” (50% of those answers) | 18.2% 95% CI 10.2–30.3% 10 mentions · avg pos 4.5 first pick 40% | — | GEMINI 50% | Claim |
| 13 | Kubernetes kubernetes.io | 10.9% 95% CI 5.1–21.8% 6 mentions · avg pos 18.7 first pick 0% | — | CHATGPT 57.1%PERPLEXITY 9.5% | Claim |
| 14 | OnlyOffice onlyoffice.com | 9.1% 95% CI 3.9–19.6% 5 mentions · avg pos 3.4 first pick 0% | — | GEMINI 25% | Claim |
| 15 | SignServer Best for: AI recommends SignServer most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (37.5% of those answers) | 9.1% 95% CI 3.9–19.6% 5 mentions · avg pos 5.4 first pick 0% | — | GEMINI 20%PERPLEXITY 4.8% | Claim |
| 16 | WPsigner wpsigner.com Best for: AI recommends WPsigner most when buyers ask “best self-hosted digital signature platform that meets legal eIDAS or ESIGN requirements” (50% of those answers) | 7.3% 95% CI 2.9–17.3% 4 mentions · avg pos 3 first pick 0% | — | PERPLEXITY 19% | Claim |
| 17 | SourceForge sourceforge.net Best for: AI recommends SourceForge most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (50% of those answers) | 7.3% 95% CI 2.9–17.3% 4 mentions first pick 0% | — | PERPLEXITY 19% | Claim |
| 18 | PandaDoc pandadoc.com Best for: AI recommends PandaDoc most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (37.5% of those answers) | 5.5% 95% CI 1.9–14.9% 3 mentions · avg pos 2 first pick 33.3% | — | GEMINI 5%CLAUDE 14.3%PERPLEXITY 4.8% | Claim |
| 19 | Zapier AI zapier.com | 5.5% 95% CI 1.9–14.9% 3 mentions · avg pos 2 first pick 0% | — | GEMINI 5%PERPLEXITY 9.5% | Claim |
| 20 | Caddy caddyserver.com | 5.5% 95% CI 1.9–14.9% 3 mentions · avg pos 10.7 first pick 0% | — | GEMINI 5%PERPLEXITY 9.5% | Claim |
| 21 | Adobe Sign adobe.com Best for: AI recommends Adobe Sign most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (37.5% of those answers) | 5.5% 95% CI 1.9–14.9% 3 mentions first pick 0% | — | CHATGPT 14.3%CLAUDE 14.3%PERPLEXITY 4.8% | Claim |
| 22 | Veriffy | 3.6% 95% CI 1–12.3% 2 mentions · avg pos 3.5 first pick 0% | — | GEMINI 10% | Claim |
| 23 | JSignPdf | 3.6% 95% CI 1–12.3% 2 mentions · avg pos 5 first pick 0% | — | GEMINI 10% | Claim |
| 24 | LibreOffice libreoffice.org | 3.6% 95% CI 1–12.3% 2 mentions · avg pos 5 first pick 0% | — | GEMINI 10% | Claim |
| 25 | React react.dev | 3.6% 95% CI 1–12.3% 2 mentions · avg pos 5.5 first pick 0% | — | PERPLEXITY 9.5% | Claim |
| 26 | OpenAlternative openalternative.co Best for: AI recommends OpenAlternative most when buyers ask “open-source e-signature alternatives to expensive hosted document signing services” (37.5% of those answers) | 3.6% 95% CI 1–12.3% 2 mentions · avg pos 28.5 first pick 0% | — | CHATGPT 28.6% | Claim |
| 27 | FreeSign freesign.io | 3.6% 95% CI 1–12.3% 2 mentions · avg pos 38 first pick 0% | — | CHATGPT 28.6% | Claim |
| 28 | AWS aws.amazon.com | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 1 first pick 100% | — | CLAUDE 14.3% | Claim |
| 29 | Azure | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 1 first pick 100% | — | CLAUDE 14.3% | Claim |
| 30 | E-Sign | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 1 first pick 100% | — | PERPLEXITY 4.8% | Claim |
| 31 | MySQL mysql.com | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 1 first pick 100% | — | PERPLEXITY 4.8% | Claim |
| 32 | SQLite | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 1 first pick 100% | — | PERPLEXITY 4.8% | Claim |
| 33 | Sproof Sign | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 2 first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 34 | HelloSign hellosign.com | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 3 first pick 0% | — | GEMINI 5% | Claim |
| 35 | Parse Server | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 3 first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 36 | Binhex Cloud (Sign) | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 5 first pick 0% | — | GEMINI 5% | Claim |
| 37 | SignServer Community | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 5 first pick 0% | — | GEMINI 5% | Claim |
| 38 | eIDAS Advanced Electronic Signature Client | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 6 first pick 0% | — | GEMINI 5% | Claim |
| 39 | eSignature DSS | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 6 first pick 0% | — | GEMINI 5% | Claim |
| 40 | eSign.AI | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 20 first pick 0% | — | CHATGPT 14.3% | Claim |
| 41 | Redis redis.io | 1.8% 95% CI 0.3–9.6% 1 mentions · avg pos 78 first pick 0% | — | CHATGPT 14.3% | Claim |
| 42 | Blueink blueink.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 43 | Docupilot docupilot.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 44 | F6S f6s.com Best for: AI recommends F6S most when buyers ask “best self-hosted digital signature platform that meets legal eIDAS or ESIGN requirements” (37.5% of those answers) | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 45 | GetAccept getaccept.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 46 | Hostinger hostinger.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 47 | Inkless useinkless.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 48 | Open eSignForms | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 49 | Signeasy signeasy.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
| 50 | Sliplane sliplane.io Best for: AI recommends Sliplane most when buyers ask “lightweight self-hosted e-signature alternatives to costly commercial signing platforms for small teams” (37.5% of those answers) | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | CLAUDE 14.3% | Claim |
| 51 | The Digital Project Manager thedigitalprojectmanager.com | 1.8% 95% CI 0.3–9.6% 1 mentions first pick 0% | — | PERPLEXITY 4.8% | Claim |
Reading the numbers: Share is a point estimate on 55 sampled answers, so each row also shows its 95% CI — the Wilson score interval around that share. When two products' intervals overlap, the gap between them isn't statistically meaningful at this sample size. First pick is the share of a product's recommending answers where it was named first, which separates “always mentioned” from “usually the top recommendation”. Full methodology.
Independence: Orbator customers are badged for disclosure. Customer status does not affect prompts, sampling, extraction, or ranking — see the methodology. Your product on this list? Claim it to see the prompts behind your rank and track it weekly.
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