Features
Every primitive your signing flow needs.
From AI field detection to HIPAA-grade audit trails, SpitShake ships the full stack for modern document signing.
Start freeAI field detection
Auto-place signature, date, and text fields on uploaded PDFs.
Multi-party signing
Ordered or parallel workflows. Witness sign-off. Delegation.
Knowledge-based auth
KBA quizzes for high-assurance identity verification.
SMS verification
Phone OTP before signing. Globally routed.
Email 2FA
Second-factor email verification at the signing link.
Digital signatures
Cryptographic PDF signatures with TSA timestamps.
Payments
Collect ACH / card payments inline with signatures.
Bulk import
Send hundreds of submissions from CSV / XLSX.
Custom domains
White-label signing at your domain.
Teams
Roles, permissions, and org-wide MFA enforcement.
Webhooks
14 HMAC-signed event types. Retried on failure.
MCP server
Let Claude / Cursor / ChatGPT send documents via MCP.