ProofLens

ProofLens

Auto-align & strobe PDF/AI/image compare tool

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As a packaging designer with 18 years of experience, I built ProofLens to solve the pain of manual proofing. Unlike complex enterprise systems, this is a simple, focused tool that auto-aligns your files and highlights differences instantly. Features like "Strobe Mode" (flashing between versions) help you catch subtle shifts or missing elements in seconds. Stop relying on your tired eyes—let ProofLens handle the comparison.
ProofLens gallery image
ProofLens gallery image
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Launch tags:Design Tools•Productivity•Printing
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What do you think? …

Evelyn Yi-Ting Liu
Maker
📌
Hi Product Hunt! 👋 I'm Evelyn, a packaging designer with 18 years of experience. I built ProofLens because I was exhausted from the "stare and compare" game. You know the struggle: trying to spot if a barcode shifted 1mm or if a disclaimer line changed. Enterprise software was too complex, so I decided to build the tool I actually wanted to use. ProofLens is simple: Auto-alignment: No more manual nudging. Multi-page Support: Compare entire PDFs or multiple pages at once. Strobe Mode: Flash between versions to spot tiny changes instantly. Portable: It's a lightweight desktop tool (Windows)—no installation required, just click and run. 🎁 Launch Special: To celebrate the launch, I'm offering 50% OFF for the Product Hunt community until Dec 31! Use code: PH50. I’d love to hear what you think! Cheers!
Agbaje Olajide

This hits a major pain point for any designer doing client or print work. Staring at versions to catch a 1mm shift is the worst. Building a tool that's simple and does exactly that one job is perfect.

A practical question for professional workflows: Does ProofLens generate a summary report or highlight sheet of the differences it finds? This would be invaluable for sending feedback to clients or printers without them having to interpret the strobe mode themselves.

Evelyn Yi-Ting Liu
Maker

@olajiggy321

Thanks, really appreciate that — you described the pain point perfectly.

At the moment, ProofLens doesn’t generate a separate summary report or highlight sheet. Instead, it visually marks differences directly on the artwork (e.g. red boxes around shifted or missing elements).

In most workflows, designers simply screenshot or export those marked views and use them as feedback when communicating with clients or printers. That’s actually how I’ve been using it myself.

A dedicated summary or report feature is something I’ve thought about, but for now the focus is on keeping the tool fast, visual, and friction-free during proof checks.

Agbaje Olajide

@evelynytliu 
Thanks, that makes total sense—keeping it fast and visual is the core strength. Using marked screenshots for feedback is a solid real-world workflow.

It gave me a simple idea on how to frame that exact 'screenshot as report' method on your site to pre-empt the question and highlight speed. It's something you could try on your own.

Best way to send it to you?