Send documents for signature.
Compliant where it counts.
PurpleSign is an e-signature service designed and tested against 21 CFR Part 11 — built for clinical research sites and anyone whose signatures must stand up to inspection.
Signups open at launch. Pilot members get in first — write to support@purplesign.app.
Built so the record holds up
Audit trail on every envelope
Every send, view, and signature is recorded. Completed envelopes ship with a Certificate of Completion and a tamper-evident hash — the evidence is part of the document, not an add-on.
Never ration signatures
Every paid tier sends unlimited envelopes. No per-send metering, no surprise overage, no upsell wall between you and a signed document.
Serious about regulated work
Designed and tested against 21 CFR Part 11, with support for HIPAA workflows under a BAA on the Business tier. Built by people who work in clinical research every day.
Pricing
Free is the full individual product with a monthly cap — not a crippled demo. Paid tiers never meter your envelopes.
Free
$0
- 3 envelopes / 30 days
- Templates & quick-sign
- Audit trail + completion certificate
- Signed-PDF delivery
Business
$25 / user / month
- Unlimited envelopes, multiple seats
- API keys & webhooks
- Part 11 mode eligibility
- HIPAA workflows under a BAA
- Custom branding
PurpleSign is in early access: external signups are gated while we finish the pilot. Request access and we will set your workspace up directly. Enterprise (custom retention, contract terms) is sales-led — same address.
Who builds this
PurpleSign is built by Purple Directive, a clinical-research operations company. We run trials, write SOPs, and sit through audits — this product exists because the signature tools we were handed didn't hold up to that work.
Questions before you commit an envelope to it? Ask us anything at support@purplesign.app.