How to Share Prototypes with Investors Without Leaking Your IP

You've built something worth showing. An investor wants to see it. A potential client asks for a demo. A beta tester needs access.

But the moment you share a URL, you lose control. Anyone with that link can forward it. Screenshots happen. Ideas get mentioned in conversations you'll never hear about.

You need feedback to build the right thing. But sharing your work exposes the very ideas that make it valuable.

The usual approaches

Most teams reach for one of these:

Password-protected pages are simple, but passwords get shared. Once someone texts "the password is demo123" to a colleague, the gate is gone. You also have no record of who accessed what.

Screen-share calls are safe, but they don't scale. The reviewer can't explore at their own pace, and you're bottlenecked by your calendar. (They can still screenshot during the call anyway.)

Private beta platforms like TestFlight work for native apps, but web prototypes don't have a built-in access layer. Most beta platforms also skip the legal side entirely.

And "just trust them" works until it doesn't. Without explicit confidentiality terms, you have no legal recourse if something leaks.

Authentication + legal agreement + proxy

The approach that actually covers everything combines three pieces:

First, authentication. Every reviewer proves their identity before seeing anything. Not a shared password, but real identity verification tied to their email.

Second, a legal agreement. They read and accept an NDA with their name, timestamp, and IP recorded. Not a checkbox buried in a terms page, but a full-screen agreement they have to sign.

Third, a reverse proxy. Your prototype stays on your own infrastructure, unchanged. Authenticated traffic gets forwarded to it. The reviewer never gets your real URL.

This is how ProtoWall works. You create a project, point it at your prototype, and invite reviewers by email. They click the link in the invite email, sign the NDA, and access the prototype through the proxy. One click from their inbox to the agreement page. If you update the NDA later, they have to re-accept before they can get back in. You can revoke access at any time, and their sessions terminate immediately.

The audit trail is your insurance

Every action gets logged with a timestamp, IP address, and user agent. Who was invited. Who accepted which version of the NDA. Who accessed the prototype and when. Who got revoked.

This is legal protection. If something leaks, you have timestamped evidence that the person accepted specific confidentiality terms before viewing your work. Export the full audit trail as CSV, or download a per-reviewer PDF evidence package with consent records, the signed NDA text, IP addresses, and SHA-256 content hashes. That's the difference between "we trusted them" and "here's a documented paper trail."

Your prototype doesn't need to change

ProtoWall is a reverse proxy. It sits between the reviewer and your app, handling authentication and agreements. Your prototype serves requests exactly as it always did. You don't install an SDK, add middleware, or change any code.

You can optionally add a one-line check for an origin secret header to block direct access, but even that's optional.

When this matters most

Investor demos where your prototype contains unreleased features or proprietary algorithms. Client previews before contracts are signed. Private betas where you're iterating on something competitors would love to see. Design reviews with external advisors. Due diligence for a potential acquisition.

Any situation where you're sharing work that has value precisely because it's not public yet.

Getting started

ProtoWall's free plan includes one project and five invites. Enough to run a real pilot with a small group. No credit card required. Setup takes about five minutes.