月下の契約
AGENT-FIRST · MCP-NATIVE · LEGALLY BINDING

You will never edit a contract again.

LetSign.ai is an agentic deal-closing app: personalised proposals drafted from your calls, sent and signed while you keep selling. Legally binding e-sign + Stripe, MCP native.

The lowest-fee, most agent-native way to generate contracts and close deals. Verifiably ->

Start freeSee pricing - $19 until Oct 1
Pricing

One plan. $19 until October 1.

Founding price for early workspaces, locked with your rates until 2028.

Launch price ends in
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Days
00
Hours
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Minutes
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Seconds
Free
$0/mo
  • 0.20% on payments collected
  • Unlimited seats - Full MCP
Start free
Current - Until Oct 1
Launch
$19$49/mo
  • 0% to $20,000/mo, then 0.05%
  • Price + rates locked to Oct 1, 2028
$19 for 00d 00h 00m 00s
Lock 0% fees
From Oct 1
Future
$49/mo
  • What the launch plan becomes
See full pricing and the fee comparison ->
一期一会
FROM THE CALL

The proposal remembers the call.

FROM THE TRANSCRIPT

“As discussed Thursday, lead with the rebrand before the campaign work.”

“The $4,200/mo we agreed - 6-month minimum, then month to month.”

“Their worry: being locked in. Answered in the terms.”

PREPARED FOR ASTER BOTANICALS

Pick the retainer that fits - the middle tier is the $4,200/mo we agreed on the call.

Essentials$3,800/mo
Identity only
Recommended
Growth$4,200/mo
Rebrand + launch campaign
Partner$6,900/mo
Full retainer

The agent read the call. The proposal reflected it: priorities in the scope, the price you discussed on the cards, the objection answered in the terms. It arrives minutes after the call, while it is warm. Personalized proposals close; generic PDFs stall.

Pairs with Fathom, Granola, and Fireflies.

見本Try it

Your client signs this. Play with it.

A real contract an agent generated. Switch the look, swap the template, or hand it a prompt and watch it rewrite. Obviously fake. Reassuringly non-committal.

app.letsign.ai/sign/aster-retainer

Style

Template

Hand it a prompt

HANDS ON

Fully editable by hand. Always.

Agents are fast, but they are not the only way in. Open any draft in the LetSign app and it becomes a document you edit directly - the same blocks, prices and clauses the MCP writes, now under your cursor. Set the brand it wears in the same place. Nothing is locked until you send.

app.letsign.ai / proposals / aster-botanicals
A proposal open in the LetSign editor, with each pricing tier's price, billing interval and accent editable by hand
The proposal an agent drafted - every price, tier and clause editable by hand.
app.letsign.ai / branding
The LetSign Branding screen: brand colours, accent gradient and Instrument Sans typography that every proposal inherits
Your colours, gradient and type - set once, applied to every proposal.
EVERY BLOCK
Rewrite the scope, swap a testimonial, reorder sections, fix a line. The agent's draft is a starting point, not a cage.
CHANGE THE NUMBERS
Adjust a tier's price, add a discount, change the billing interval or the compare-at price. The cards your client sees update live.
FULL MCP PARITY
Everything an agent authors through the MCP, a person can author or amend by hand, and the reverse. One document model, two ways in.
The agent runs the paperwork. You keep the pen.
THE SHIFT

Manual contracts are slow. Deals aren't.

Contracts used to be edited by hand: slow, rigid, one at a time. LetSign generates beautiful contracts on the fly, matched to each customer's exact needs, at any scale.

BEFORE
Manual edits. Slow, inflexible, one contract at a time.
WITH LETSIGN
Beautiful contracts generated on the fly, matched to the customer, at scale.
THE BRIDGE BETWEEN HUMANS AND AGENTS
橋渡し
HOW IT WORKS

End to end, no one in the loop, and you above it.

Agents never sign. They orchestrate. Your customer signs; you supervise from the app.

01
Generate
The agent drafts the right contract, matched to the deal, the style, the template.
02
Update
Terms, pricing and clauses change in real time as the deal evolves.
03
Track
Every open, view and signature is tracked. The agent follows up on its own.
04
Collect
Subscriptions set up, payments collected, inside the same flow.
05
Sign
Your customer signs. Legally. Agents never do. They orchestrate.
USE CASES

Three ways agents already contract with LetSign.

01 · PROPOSAL-MATCHED CONTRACTS

The contract looks exactly like the proposal. Because it came from it.

Claude writes the proposal, then attaches a contract in the same style, same content. Your customer never looks twice.

PROPOSAL
CONTRACT · SAME STYLE
Amara K.
E-SIGNED
CHOOSE YOUR TERMS
UPDATED 12s AGO BY AGENT
MONTHLY
cancel anytime
ANNUAL
selected by customer
PILOT
8 weeks, fixed
02 · LIVE NEGOTIATION

Terms move as the conversation moves.

The agent adjusts terms and options in real time as the negotiation evolves. Conditional pricing tables let the customer pick their own deal.

03 · AUTOMATION AT SCALE

Thousands of contracts. Zero humans in the loop.

A quote becomes a signed job with payment collected automatically, at any volume. You see the ledger.

04:12 AM
Quote → signed job · Fencing, Dulwich Hill
$3,140.00
PAID
04:12 AM
Retainer renewal · Studio Ando
$2,400.00/mo
SIGNED
04:13 AM
Quote → signed job · Rewire, Marrickville
$1,860.00
PAID
04:15 AM
SOW amendment · Kite & Co
·
COUNTERSIGNED
TODAY1,284 SIGNED · $412,806 COLLECTED
THE LETSIGN THESIS
“A contract should fit the deal it closes. Not the template it came from.”
筆は人の手に
TRUST & LEGALITY

Binding where it matters. Auditable everywhere.

Enforceable across Western jurisdictions. Agents orchestrate. The signature is always human.

Email verification
Every signer is verified before the pen touches paper.
E-signature
Signatures compliant with ESIGN, eIDAS and equivalents.
Full audit trail
Every generation, edit and view, timestamped and immutable.
Western jurisdictions
Enforceable across the US, EU, UK, Canada and Australia.
FLEXIBILITY

Bends to the deal. Never the other way.

Built to disappear into whatever your agent is doing: a proposal, a negotiation, ten thousand quotes.

Manageable templates
Curate the templates your agents draw from. Change once, apply everywhere.
Conditional pricing
Offer pricing tables the recipient picks from, inside the contract itself.
Style-matching
Contracts inherit the exact look of whatever the agent just produced.
MCP-native
A first-class MCP server. One-click install from Claude or Codex.
夜明け

Let the agents work the night.

One click from Claude or Codex, and LetSign slots into your agentic flows. Contracts by morning.

START FREE FROM CLAUDESTART FREE FROM CODEX