Independent consultants · Boutique agencies

Turn project briefs
into proposals clients can sign.

Plumbline turns your brief into a one-page proposal clients can review through one link; they sign and pay the deposit in the same flow.

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What it is
Three in one

Proposal, signature, and deposit.

How you get paid
Held, then released

Per agreed milestone.

What it costs
$19

Flat monthly.

Plumbline markPlumbline
Proposal · 0024

Prepared for

Northwind Operations Co.

Engagement

Operating-model review

Timeline

8 weeks

Investment

$24,000

Deposit

$6,000

Scope

  • Discovery interviews + ops audit
  • Operating-model redesign
  • Implementation playbook

Sign + deposit

Confirm $6,000 commencement deposit to lock the engagement.

Sign →

Why Plumbline

One link. Three capabilities. Zero back-and-forth.

Write, send, and get paid in one flow. Your client reviews and signs the proposal — and the deposit arrives with the signature.

Features

What you actually get.

Three steps, one link. Here is what your client sees and what happens behind the scenes.

Write the proposal
Type a few details about the project. Plumbline produces a clean, one-page proposal you can review in under a minute.
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Send one link
Your client opens the link on any device. They read the proposal and sign it in the same view — no separate signing tool.
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Get paid upfront
The deposit is collected when they sign. Plumbline holds it, then releases it as the work hits agreed milestones.
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A straightforward guarantee
Cancel anytime — no questions asked
Made for independent creators

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A client voice
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