InvoiceProof wraps every invoice in a legally-trackable layer — read receipts, IP-logged opens, e-signatures, and a tamper-evident audit trail you can attach to a demand letter.
Create your invoice and send it through InvoiceProof. Your client receives a tracked link — no app, no account, no friction on their end.
Opens, re-opens, time-on-page, IP address, device — every interaction is timestamped and chained into a tamper-evident audit log.
Generate a court-ready Chain of Custody PDF in one click. Attach it to a demand letter, forward to a lawyer, or use it in small claims.
Each event record includes a SHA-256 hash of the previous one. Any tampering breaks the chain — making the log cryptographically verifiable in a dispute.
When your client opens the invoice, we capture their IP address, user agent, and precise timestamp. Not just "opened" — forensic-grade open confirmation.
Clients sign directly on the invoice page. The signature is stored with IP, timestamp, and an explicit acknowledgment — enforceable under ESIGN and eIDAS.
One-click PDF that looks like a legal exhibit — formatted for a demand letter or small claims filing, with every event, hash, and signature in one document.
| Feature | InvoiceProof | FreshBooks | Wave | Bonsai |
|---|---|---|---|---|
| Read receipts with IP logging | ✓ | — | — | partial |
| Hash-chained tamper-evident log | ✓ | — | — | — |
| E-signature with legal acknowledgment | ✓ | — | — | ✓ |
| Court-ready Chain of Custody PDF | ✓ | — | — | — |
| Dispute evidence export | ✓ | — | — | — |
"I sent the invoice. The client said they never received it. I had no proof — just my word against theirs. I wrote off $3,200."
— Freelance designer, Atlanta
InvoiceProof would have logged the open at 2:47 PM, from their office IP, three days before the dispute.
7-day trial on every plan. Card required.
For freelancers sending up to 30 tracked invoices a month.
Unlimited invoices with full legal-grade tracking and e-signatures.
For teams managing multiple clients and billing at scale.
Join freelancers and agencies who send invoices with proof built in — not an afterthought.
Start your 7-day free trial →Card required · No software for your clients · Cancel anytime