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Draft or uploadAI draftPastePDF
Draft it or bring your own
Describe the agreement and Sign drafts it, paste your own text, or upload a PDF (scans included). Merge fields fill names and dates.
E-signature from SAIG
Contracts signed, proven, filed.
Draft with AI or upload a PDF, send it to anyone by email, and get back a signed PDF with a certificate of completion and an audit trail nobody can edit. No account needed for the person signing.
Free plan, 5 envelopes a month No card to start API on every plan
9SAIG apps signing with it
88envelopes since July 2026
63signatures recorded
How it works
Three steps, one link for the signer.
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RecipientsSignerCountersignViewer
Send in order, or all at once
Parallel or sequential routing, a countersign step for you, reminders, and a void with a recorded reason if plans change.
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SignEmail codeSigned inConsent
They sign from the email
A secure link opens the document. The signer proves it is them with a 6-digit code or their SAIG sign-in, ticks consent, and signs. Everyone gets the PDF.
What you get
Everything a signature needs, nothing it doesn't.
AI drafting
Describe what you need and get a clean, structured agreement to edit before sending.
PDF upload
Large scans and passports upload straight to storage, with every page preserved.
Routing & countersign
Parallel or in order, with your own countersign step and expiry dates you set.
Signer verification
A forwarded email is not a signature. The signer proves it is them with a code or their sign-in; the wrong account is refused.
Reminders & void
Nudge whoever is pending with a fresh link; void with a reason that goes on the record.
Your branding
Your name and colours on the emails and the signing page, and a redirect to your site when done.
Webhooks
Sent, viewed, signed, declined, completed: each event posts to your system as it happens.
Embed in your portal
Already know who the user is? Mint an embed session and they sign inside your app, no email round trip.
Evidence
A signature without a verifiable trail is decoration.
Every completed envelope comes back as a PDF with a certificate of completion inside it. This is what the certificate records, for every signer.
- Consent, then intentAn explicit consent tick before signing, then a clear "Sign document" action.
- Typed legal nameThe name the signer typed, exactly as typed.
- The exact contentA SHA-256 fingerprint of the document as signed, so a changed file can never pass as the original.
- When, and from whereUTC timestamp, IP address and browser for each signature.
- How we knew it was themSigned in as the recipient, a 6-digit code sent to their email, or an authenticated session in your own app.
- An append-only audit trailCreated, sent, viewed, verified, signed, declined, voided, completed: events are written once and never edited.
Already at work
Built for our own businesses first.
Sign is the signature engine behind the SAIG estate. Nine of our apps send with it today; these are the busiest.
Pricing
Pay per envelope sent, not per seat.
An envelope is one document sent for signature, however many people sign it. Drafts you never send cost nothing. Prices in GBP, per month.
Free
£0 /month
- 5 envelopes a month
- AI drafting, PDF upload, routing, reminders
- Certificate and audit trail
- API access
- Branding and webhooks
- Stops at 5; no overage
Starter
£9 /month
- 50 envelopes a month
- Everything in Free
- Your branding on emails and signing page
- Webhooks
- 15p per extra envelope
Most room
Growth
£29 /month
- 300 envelopes a month
- Everything in Starter
- Reusable templates
- 10p per extra envelope
Scale
£99 /month
- 2,500 envelopes a month
- Everything in Growth
- Priority support
- 5p per extra envelope
Paid plans are billed monthly through SAIG Pay by card or Bacs Direct Debit; choose a plan, sign in with your SAIG account, and checkout opens. Cancel any time and the plan returns to Free at the end of the period. VAT is added where it applies. Our own SAIG apps use Sign under the estate licence, not these plans.
Developers
Signing in your software by lunchtime.
One REST API. Create an envelope with your document and recipients, send it, and listen for the webhook. Keys live in your SAIG account; the free plan includes the API.
POST /api/sign/generateAI-draft a document from a promptPOST /api/sign/envelopesCreate: title, content or PDF, recipients, routingPOST /api/sign/envelopes/:id/sendSend the invitations (this is the metered unit)POST …/:id/remind · …/:id/voidNudge, or void with a reasonGET /api/sign?op=document&id=The signed PDF with its certificate# 1. create the envelope
curl https://console.skylite.group/api/sign/envelopes \
-H "Authorization: Bearer sk_sign_live_…" \
-H "Content-Type: application/json" \
-d '{
"title": "Engagement letter",
"content_md": "# Engagement letter\n\nThis letter sets out …",
"recipients": [
{ "name": "A. Client", "email": "client@example.com", "role": "signer" }
],
"routing": "parallel",
"webhookUrl": "https://yourapp.example/hooks/sign"
}'
# → { "ok": true, "envelopeId": "…" }
# 2. send it (recipients get a signing link by email)
curl -X POST https://console.skylite.group/api/sign/envelopes/ENVELOPE_ID/send \
-H "Authorization: Bearer sk_sign_live_…"
# → { "ok": true, "status": "sent", "invited": 1,
# "usage": { "plan": "free", "remaining": 4 } }
Start today
Send your first envelope in the next five minutes.
Sign in with your SAIG account, or create one. Five envelopes a month are free, for as long as you like.