LoginSign up

Build proposals you’d actually be proud to send

Drag, drop, click to edit. The proposal builder shows you exactly what your client will see, as you build it. No more sending and hoping for the best.

Start building for free
What you see is what they get

A live preview updates as you edit. No toggling between modes, no surprises when it lands in your client’s inbox.

Slide by slide

Build your proposal like a deck. Each slide has a purpose — cover, brief, services, timeline, pricing, signature. Add what you need, drop what you don’t.

Drag to reorder

Changed your mind about the flow? Grab any slide and move it. The structure is always in your hands.

Click anything to edit

No hunting through menus. Click a heading, a price, a paragraph — an editor opens right there. Close it and the change appears instantly.

Start with AI, finish with you

Let AI draft the whole thing from a quick brief, then tweak what needs tweaking. Or start from scratch if that’s your preference. Either way works.

Start with AI, finish with you

Let AI draft the whole thing from a quick brief, then tweak what needs tweaking. Or start from scratch if that’s your preference. Either way works.

How a proposal comes together

1. Fill in the basics

Client name, project title, a quick brief. That’s enough to get started. Prosperus fills in the rest or lets AI take a first pass.

2. Build the slides

Add your services, timeline, pricing, case studies. Drag them into the order that tells the right story for this particular client.

3. Send it

Hit publish. Your client gets a link, not an attachment. They can read it, choose a package, and sign — right from their browser.

FAQs

You can use AI to generate a full draft based on your project brief, or start from a blank canvas. Either way you’re never staring at an empty page.

Cover, about, project brief, services, timeline, pricing, case studies, team, terms, and custom slides for anything else. You can hide any slide you don’t need.

Yes. Clone any previous proposal with one click, swap out the client details, and you’re most of the way there.

No. They get a link and can view, comment, and sign without logging in to anything.

Yes. Changes you make after sending update the live version your client sees. Just be careful with pricing — clients notice.