AI-native, and honest about it
Field detection, plain-language summaries and risk flags help senders and signers move faster. AI is off until an admin turns it on, and every use is counted against your plan so nothing surprises you.
AI-native digital signatures
Agreements, signed fast and sealed with a record you can stand behind.
LystSign helps teams anywhere send, sign and seal documents, with AI assistance you control, an API your developers will like, and data kept in India by design.
No card needed. Free plan: 5 envelopes a month. Paid plans from $45 a month.
A record you can stand behind
Every envelope ends in a sealed PDF and a certificate of completion with a hash-chained audit trail: who opened, viewed, signed or declined, when, and from where.
API-first from day one
A versioned REST API, signed webhooks, OAuth apps and an embeddable signing view. Build sending into your own product with the same features the console uses.
Global product, India-first posture
Built for teams anywhere, with documents, keys and audit trails stored in AWS India regions and a design aligned with the IT Act 2000 and the DPDP Act 2023.
From upload to sealed in four steps
1
Upload
PDF, Word, Excel or PowerPoint. Office files are converted to PDF for you.
2
Place fields
Drag signature, initials, date and text fields, or reuse a template.
3
Send
Signers in order or in parallel, with reminders and expiry. No account needed to sign.
4
Seal
A tamper-evident PDF and certificate of completion, ready to download or fetch by API.
Security and compliance, stated carefully
Encryption at rest with LystSign's own AWS KMS keys, tenant isolation enforced in the database, strong sign-in with passkeys and two-factor authentication, and a private worker that processes documents without internet access. LystSign is designed for SOC 2 Type II and ISO/IEC 27001 readiness; we do not claim certification.
How we protect your documents →For developers
curl -X POST $LYSTSIGN/api/v1/envelopes \ -H "Authorization: Bearer ls_live_…" \ -H "Idempotency-Key: 7f1c…"API and webhooks →
Product news
Occasional updates on new signing methods and integrations.