ProtoPeek

Prototype sharing tools accumulate: links live forever, old versions pile up, and eventually nobody knows what is still exposed. This inverts the default. Fourteen days after upload the prototype, every version, all reviewer feedback and all screenshots are destroyed — and nothing moves that date. Publishing a new version does not extend it. There is no grace period and no re-open.

Reviewers need no signup and no account; they enter an email only so comments are attributed, and they pin annotations directly onto the running page. Every pin ships with the screenshot the reviewer was actually looking at, so the agent reads the pixels rather than guessing from a CSS selector. The whole service is open source under MIT, which is what makes the privacy claims checkable rather than promised.