Sign contracts
in minutes,
not days.
Cosine is the e-signature platform built for contractors. Upload, send, sign, done. No training required. No enterprise bloat.
How It Works
Three steps. That's it.
No onboarding calls. No training sessions. If you can send an email, you can use Cosine.
Upload your document
Upload any PDF — proposals, contracts, change orders, lien waivers. No conversion needed.
Add signature fields
Drag and drop signature, date, and initials fields exactly where they need to go. Takes under a minute.
Send & track
Recipients sign on any device — phone, tablet, desktop. You get notified the moment they sign.
Features
Everything you need. Nothing you don't.
Cosine is not an enterprise tool awkwardly scaled down for small contractors. It was built for you from the ground up.
Legally Binding
ESIGN and UETA compliant. Full audit trail with timestamps, IP addresses, and document hashes. Holds up in court.
Built for Speed
No training needed. Upload a PDF, add fields, send. Your client signs in under 60 seconds — on their phone, while standing in your driveway.
Contractor-First
Designed for proposals, contracts, change orders, and lien waivers. Every field type, every workflow — built for how you actually work.
Audit Trail
Every action logged. Every document hashed. Complete chain of custody — who signed, when they signed, what IP they used. Legal protection you can actually use.
Trusted by contractors who value their time
60s
Average signing time
ESIGN
& UETA compliant
256-bit
AES encryption at rest
Pricing
Free during beta.
No credit card. No commitments. Get started and tell us what you need.
Pricing will be announced before beta ends. Early users get priority rates.
Get Started — No Credit Card RequiredEverything included
- Unlimited documents during beta
- ESIGN & UETA compliant signatures
- Full audit trail with timestamps
- 256-bit AES encryption
- Send to any email address — no account required for signers
- Sign on any device
- Instant notifications when signed
- PDF download of completed documents
We will notify you before any pricing changes. Cancel or export your data anytime.