Signing17 of 20
Legal strength0 of 20
Security11 of 19
Connections9 of 15
Price and limits26 of 26
e-signature service · OpenSign Labs
OpenSign
Open-source e-signature service with a free plan that has unlimited signatures and templates.
In short
- The free plan lists unlimited e-signatures, unlimited templates, signing in order and completion certificates1.
- Professional costs $9.99 a month on yearly billing ($29.99 on monthly billing)1.
- Professional adds API access, webhooks, Zapier and bulk send, with 240 premium credits a year1.
- The code is open source under AGPL-3 and can be self-hosted3.
- Single sign-on is listed only on the Enterprise plan, and a mobile app and payments are marked coming soon1.
OpenSign suits people who want to send unlimited documents for free, or run the software themselves1,3. Professional at $9.99 a month adds the API, bulk send and Zapier1. The catch: the pricing page names no security certification and no EU signature level, and its mobile app and payments are not yet released1,2.
Best for: People who want free unlimited signing and the option to self-host.
Where the points come from
Signing 17 of 20 points
| Rule | What is published | Points |
|---|---|---|
| Reusable templates | YesFree plan lists unlimited templates; Professional includes everything in the free plan1. | 6 / 6 |
| Bulk send | YesProfessional lists bulk send, up to 240 documents a year on yearly billing1. | 4 / 4 |
| Signing order | YesThe free plan lists send in order1. | 3 / 3 |
| Collect payment while signing | NoPayment requests are marked coming soon on the Teams plan1. | 0 / 3 |
| Audit trail on every document | YesCompletion certificates are listed on the free plan, which Professional includes; they carry access logs1,2. | 4 / 4 |
Legal strength 0 of 20 points
| Rule | What is published | Points |
|---|---|---|
| Highest eIDAS signature level | Not publishedNot published on the vendor's FAQ or pricing pages2,1; the FAQ says only that signatures comply with laws in many jurisdictions. | 0 / 12 |
| Signer ID check | Not publishedNot published on the vendor's pricing or FAQ pages; the pricing page lists only email-based verification1,2. | 0 / 5 |
| US ESIGN and UETA named | Not publishedNot published on the vendor's FAQ page, which names no specific law2. | 0 / 3 |
Security 11 of 19 points
| Rule | What is published | Points |
|---|---|---|
| SOC 2 Type II or ISO 27001 | Not publishedNot published on the vendor's FAQ or pricing pages2,1. | 0 / 8 |
| Single sign-on (SSO) | YesSSO support is listed among the Enterprise features1. | 5 / 5 |
| Two-factor sign-in | YesThe help centre documents two-factor sign-in with an authenticator app under Settings, Preferences, Security5. | 3 / 3 |
| Open source | YesThe GitHub repository says OpenSign is licensed under AGPL-33. | 3 / 3 |
Connections 9 of 15 points
| Rule | What is published | Points |
|---|---|---|
| Public API | YesAPI documentation is public, and API access is listed on Professional at $9.99 a month4,1. | 7 / 7 |
| Storage and automation links | Dropbox, ZapierFree plan lists import from Dropbox; Professional lists Zapier. Google Drive and OneDrive are not named1. | 2 / 4 |
| Mobile apps | NoneThe pricing page marks a mobile app as coming soon1. | 0 / 4 |
Price and limits 26 of 26 points
| Rule | What is published | Points |
|---|---|---|
| Free plan | YesFree for life: request signatures from others with unlimited e-signatures1. | 8 / 8 |
| Documents a month on the cheapest paid plan | 100The free plan, included in Professional, lists unlimited signatures; premium credits (240 a year) cover only API, public-link, kiosk and bulk sends1. | 8 / 8 |
| Cheapest paid plan | $9.99/moProfessional, $9.99 a month on yearly billing1. | 10 / 10 |
The rule behind each line: how we score e-signature services.
Plans and prices
As the vendor lists them, before tax. Prices are in US dollars unless the plan shows euros; the points use US dollars, with euros converted at the ECB rate.
| Plan | Price as listed | Per month | Notes |
|---|---|---|---|
| Free1 person | Free1 | $0 | Unlimited signatures and templates, send in order |
| Professional1 person | $9.99/month1 | $9.99 | API, webhooks, Zapier, bulk send; $29.99 on monthly billing |
| TeamsTeams | $19.99/user/month1 | $19.99 | Shared templates, 500 premium credits a year; $39.99 on monthly billing |
The yearly view of the pricing page is labelled 66% off; the $29.99 and $39.99 figures are the monthly view1.
Strengths
- Free plan lists unlimited signatures, templates and guest signers, and lets you request signatures from others1.
- Source code is public on GitHub under AGPL-33.
- Two-factor sign-in with an authenticator app is documented in the help centre5.
- Each finished document gets a completion certificate with access logs2,1.
- API documentation covers documents, templates, contacts and webhooks4.
Limits
- Premium actions such as API sends and bulk send use credits: 240 a year on Professional1.
- The pricing page marks the mobile app and payment requests as coming soon1.
- Single sign-on is listed only for Enterprise, which is priced on request1.
- No SOC 2, ISO 27001 or eIDAS level is named on its pricing or FAQ pages1,2.
What OpenSign Labs says
Vendor claims. We show them, but they earn no points.
- OpenSign says its signatures are legally binding in most countries2.
Other e-signature services
- 1
BoldSignSmall teams that want cheap plans and a qualified-signature option92/100$5/mocheapest paid plan - 2
Zoho SignIndividuals and small teams that want a free plan and a path to qualified signatures90/100$10/mocheapest paid plan - 3
Dropbox SignIndividuals and small teams who want unlimited sending and a Dropbox link85/100$15/mocheapest paid plan - 4
DocuSign eSignatureTeams that need certifications and EU signature levels, and can pay for them76/100$10/mocheapest paid plan
Sources
- OpenSign pricing, OpenSign. Accessed 8 Oct 2026.
- OpenSign FAQs, OpenSign. Accessed 8 Oct 2026.
- OpenSignLabs/OpenSign, GitHub. Accessed 8 Oct 2026.
- OpenSign API v1.1 documentation, OpenSign docs. Accessed 8 Oct 2026.
- Security (two-factor authentication and passkeys), OpenSign docs. Accessed 8 Oct 2026.
Website: www.opensignlabs.com · Markdown version · We are not affiliated with OpenSign Labs.