development in the details
eSignStack is our own e-signature product. A team uploads a PDF, places the fields, chooses who signs and in what order, and follows the envelope until everyone has signed. Signers sign on a phone or a computer without making an account, and every signed copy is kept with a record of who signed and when.
Paid plans send unlimited envelopes from the app, starting at $12 a month, and a free plan covers 5 envelopes a month. The REST API, webhooks and embedded signing come with every plan.
From Upload to Signed
Upload one PDF or several, place signature, initials, date, text, checkbox, dropdown and attachment fields, and add the people who sign. Choose whether they sign in order or all at once, set how often reminders go out and when the request expires, then send. The envelope list shows who has signed and who hasn't, and a reminder is one click away. When everyone is done, eSignStack produces the signed PDF with a certificate and the full signing history.
Templates, Signing Links and Kiosks
Teams save as many templates as they need and send from them in a few clicks, or share a signing link that anyone can open. On Pro and up, a tablet at the front desk becomes a kiosk for waivers and check-in, and signers see the workspace's own logo and colors.
Signed Documents You Can Check
Anyone can upload a signed PDF to the eSignStack verification page and see that it hasn't changed since it was signed. On the Platform plan, signed PDFs also carry an Adobe-trusted seal and timestamps, and signers can be asked for an access code or a code sent by text. The PDF work runs on Vicam PDF, the engine we build for our own products.
Built for Software That Serves Many Businesses
The Platform plan gives every business on a customer's software its own workspace, brand kit and monthly usage, all on one API key, with "Powered by eSignStack" hidden. Developers get a REST API, webhooks, embedded signing and a free sandbox for testing.
Send Envelopes from Claude or ChatGPT
eSignStack also works with the AI assistant a team already uses. Connect Claude, ChatGPT or Codex, and the assistant can prepare an envelope, send it, check who hasn't signed and send a reminder. It works with the permissions of the person who connected it and checks with them before it sends, voids or deletes anything.
