Pricing.
The SDK is MIT-licensed and free forever. When you don't want to run Postgres, rotate certs, chase deliverability, or answer auditors — Cloud starts at $19/mo. Per-envelope overage is $0.20, the cheapest on the market.
- @e-sig/core, React UI, Supabase adapters
- PKCS#7 + RFC-3161 + PAdES
- Multi-signer envelopes
- Tamper-evident audit hash-chain
- Filesystem adapters — zero services
- Community support (GitHub Discussions)
- No warranty, no SLA
- 100 envelopes/mo · 1 user
- Managed Postgres audit chain
- S3 storage + verify page
- Postmark email (at cost)
- REST API + TypeScript SDK
- Webhooks, tokenized links
- $0.20/envelope overage
- Email support · 24h response
- 500 envelopes/mo · 5 users
- Everything in Starter
- Higher rate limits (300 req/min)
- Custom subdomain
- $0.20/envelope overage
- Priority email · 12h response
- 1,500 envelopes/mo · 15 users
- Everything in Team
- 1,000 req/min rate limit
- Priority queue on signing
- $0.20/envelope overage
- Priority email · 4h response
- Priority email + Slack Connect · 8-business-hour response
- Signed commercial invoice + W-9 + insurance certificate
- Vendor security questionnaire pack (CAIQ, SIG Core, DPA)
- Quarterly security patches · 90-day breaking-change notice
- DPA and BAA available
- Non-public @e-sig/enterprise adapters (SSO/SAML, LDAP audit sink, S3 Object-Lock, HSM)
- Named contact — a founder, not a queue
- Everything in Business
- Signed MSA (Common Paper base, redlined)
- Air-gapped / on-prem via Helm chart + installer
- HSM signer (CloudHSM / YubiHSM / on-prem PKCS#11)
- WORM archival (S3 Object-Lock or Glacier Vault Lock)
- SSO/SAML + SCIM
- Custom SLA (99.95% / 99.99% with credits)
- 24×7 Sev-1 · dedicated Slack Connect
- Volume-tiered per-envelope pricing above 100k/mo
Vertical add-ons
Available on Business + Enterprise. Priced separately so they never inflate the base — turn on the ones you need, leave the rest off.
| Add-on | Monthly | Who buys it |
|---|---|---|
| HIPAA BAA + Healthcare Runbook | $500 / mo | Clinical trials, EHR, telehealth |
| HSM Signer (PKCS#11) | $800 / mo | Regulated finance, notary, government |
| eIDAS QES Integration | $1,500 / mo | EU legal, real-estate, insurance |
| 21 CFR Part 11 | $1,200 / mo | Pharma, medical devices |
| UUAID Enterprise (agent-signed docs) | $500 / mo | AI agent platforms |
| WORM Archival (Object-Lock) | $300 / mo | SEC / FINRA, legal discovery |
How we price vs the market
| Provider | Entry paid | Volume plan | Overage / env | Self-host? | License |
|---|---|---|---|---|---|
| e-sig Cloud | $19/mo (100 env) | $79/mo (1,500 env) | $0.20 | Yes, free | MIT |
| DocuSign | $10/mo (5 env) | $40/user/mo | $2.00–$4.00 | No | Closed |
| Dropbox Sign | $15/mo | $300/mo API | $1.00–$1.20 | No | Closed |
| BoldSign | $5/user/mo | $30/mo API (40 env) | $0.75 | No | Closed |
| PandaDoc API | $40/mo (40 docs) | Custom | $2.00–$4.00 | No | Closed |
| DocuSeal | $20/user/mo | Pro only | — | Yes | AGPL-3.0 |
| Documenso Cloud | $30/user/mo | $30/user/mo | — | Yes | AGPL-3.0 |
Comparison reflects publicly available offerings as of 2026 and is intended as guidance for procurement conversations. Check each vendor for current terms.
Common questions
Why is the SDK free but the Cloud isn't?
The SDK is MIT and always will be. You pay us when you don't want to run Postgres, rotate certs, chase deliverability, and respond to auditors yourself.
Do I need Business if I self-host?
No. Business exists for teams whose procurement needs an invoice, a DPA, and a named contact. If you're a solo developer, self-host free.
What counts as an envelope?
One document, any number of signers. Same definition as DocuSign, BoldSign, Dropbox Sign. Verifications, downloads, and reminders are free.
What about SSO / SAML?
Available on Business and Enterprise. We don't put SSO behind a $50k+ tax — it's a $299/mo Business feature.
Is signing legally binding?
The signing path targets ESIGN and UETA in the US: intent (explicit consent), attribution (actor, IP, UA, cert fingerprint), integrity (PKCS#7 + optional RFC-3161 timestamp). You remain responsible for your own compliance review.
What are your uptime commitments?
Cloud is a 99.9% target (not contractually credited). Business is 99.95% credited. Enterprise negotiates 99.99% with credits, up to 30% of monthly fees.