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Send contracts by email or WhatsApp, collect electronic signatures, and prove everything with an audit trail, SHA-256 hash, and timestamp.
7-day free trial — no credit card required
legal compliance
from /mo
ready-to-use templates
A simple experience for senders, signers, and anyone who needs proof.
Send documents by email and WhatsApp. The signer signs from their phone in seconds — no app, no signup.
SHA-256 hash, FreeTSA timestamp, audit trail with 16+ events, geolocation, IP, and public verification with QR Code.
NDA, service contracts, leases, employment and more. WYSIWYG editor to customize every clause.
Multiple signers with e-CPF and e-CNPJ on the same document, full legal validity (ITI-approved).
Every signed document is generated in PDF/A-2b, the ISO standard for long-term preservation — ready for legal archival.
Every document signed on VaultSign goes through 4 layers of security that create complete digital forensic evidence. The same standard used by banks and large enterprises.
Each document gets a unique cryptographic fingerprint. If even 1 byte changes, the hash changes completely.
RFC 3161 certified timestamp via FreeTSA.org. Proves the exact date of the signature and that the document existed at that moment.
Every action generates an automatic record with complete digital forensic evidence. Impossible to deny signing.
Anyone — bank, lawyer, judge — can verify authenticity in seconds. Exclusive to VaultSign.
From the underlying infrastructure to the signer's identity — every link in the chain operates under an auditable security standard.
VaultSign runs on Vercel (compute) and Supabase (database + storage), which in turn run on AWS. All three are audited annually under SOC 2 Type 2 and certified to ISO 27001. The infrastructure controls are inherited from these providers; VaultSign itself does not hold these certifications.
TLS 1.3 on every HTTPS connection. AES-256 at rest for document storage and the Postgres database, managed by Supabase.
Digital signatures using an ICP-Brasil-chained certificate have the same legal weight as a handwritten signature, per MP 2.200-2/2001 and Law 14.063/2020 (Brazil).
Personal-data handling aligned with Law 13.709/2018. 5-year retention policy for biometric data collected via KYC (Article 11). Data-subject rights served by the support team.
Every meaningful action — created, sent, opened, signed, declined, expired — generates an immutable record with IP, geolocation, user-agent and timestamp, attached to the document's completion certificate.
Two-factor authentication via email for account holders. Signer identity verification (selfie + document + liveness) via Didit, for flows that require identity assurance.
The SOC 2 Type 2 and ISO 27001 certifications belong to the infrastructure providers (Vercel, Supabase, AWS). VaultSign inherits these providers' controls but does not hold these certifications in its own name.
The flow is designed to reduce friction without compromising the legal trail.
Pick from 40+ ready-to-use templates or upload your PDF. Customize with the visual editor.
Add signers, position signature fields, and send with one click.
PDF with completion certificate, SHA-256 hash, timestamp, and verification QR Code.
| Feature | VaultSign | DocuSign | ClickSign |
|---|---|---|---|
| Starting price | $14.99/mo / $99.99 LTV | $25+/mo | R$49+/mo |
| KYC (identity verification) | Included (5/month) | Paid add-on | ✕ |
| ICP-Brasil signature (multi-signer) | Included | ✕ | Paid add-on |
| WhatsApp sending | ✓ | ✕ | Paid |
| Public verification + QR Code | ✓ | ✕ | ✕ |
| US + Brazil validity | ✓ | ✓ | Brazil only |
| SHA-256 hash + TSA | ✓ | ✓ | ✓ |
| PDF/A-2b long-term archival (ISO 19005) | ✓ | — | — |
| VaultSign AI assistant | Included | ✕ | ✕ |
| Google sign-in | ✓ | ✓ | ✕ |
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