Hey Product Hunt! Jon here, maker of ProofStack. I've been on both sides of the creative approval process — as a designer waiting days for feedback buried in email threads, and as a client trying to explain what "move it slightly to the left" actually means on a static screenshot. The approval loop is where creative projects go to die. Files get lost in email. Feedback is scattered across Slack, texts, and Google Docs. And when a client finally says "approved" — there's no record, no timestamp, nothing you can point to when they come back two weeks later saying "I never signed off on that." ProofStack fixes this with one simple flow: upload your deliverable, share a magic link, get feedback and approval — no client login required. A few things I'm particularly proud of: - Pin-drop annotations — clients click exactly where they mean, no more "the thing on the right side" - Cryptographic approval seals — every approval is hashed with SHA-256 so there's a tamper-proof record of who approved what, and when - Zero friction for clients — one link, no account, no password. They open it and start reviewing immediately - Version history — every revision is tracked so you never lose context on how a project evolved I built this because I wanted the approval step to feel as intentional as signing a document, not as forgettable as a thumbs-up emoji in a chat thread. Would love your feedback — what does your creative approval workflow look like today? What's the most painful part?

ProofStack

The approval workflow creatives actually deserve

The approval workflow creatives actually deserve