Perkoon vs Proofapp

File transfer was a solved problem. Then everyone decided to make it worse — size caps, forced signups, expiring links, surprise paywalls. The usual.
Perkoon unsolved it.
Free P2P transfers beam files directly between browsers. No server in the middle. No size limit. No account. Both parties online, files move. Simple physics.
Cloud storage exists for when the other human is offline, encrypted and waiting for them whenever they show up. This one costs money. Servers aren't powered by good vibes.
Here's where it gets interesting: Perkoon is the first file transfer service built with native agent accessibility. Machine-readable state, stable DOM selectors, automation API. Your AI workflows can send and receive files without pretending to be a human clicking buttons. The future showed up early.
CLI included: npx perkoon send/receive. Works browser-to-CLI, CLI-to-CLI. Because terminals deserve nice things too.

Proof is a visual feedback and website review platform that helps designers, developers, and their clients collaborate more efficiently. Upload any website URL and Proof automatically captures desktop and mobile screenshots. Reviewers can pin comments directly on the design, reply in threads, attach files, and resolve feedback — all without needing an account. Features include real-time notifications, Slack integration, multi-page support, customizable accent colors, and a generous free tier. Whether you're a freelancer collecting client feedback or an agency managing multiple projects, Proof eliminates the confusion of scattered emails and vague revision notes by keeping all feedback visual, organized, and actionable.