Overlay tools drown a moved view or a resized sheet in false red. Revisic lines up the views first, then shows only what actually changed.
“Other tools overlay two PDFs and call it done. When a view moves to another sheet, or the sheet is resized to a different format, you get a wall of red — and the actual changes drown in noise.”
You've seen all of these. Each one is a one-line bug report against the way diff has always worked on drawings.
A view shifted position, or migrated to another sheet entirely, between revisions. Pixel overlay reports it as “deleted + added.” Revisic lets you compare it as the same view, wherever it ended up.
Same drawing, larger format. Pixel overlay reports every element as moved. We normalize the layout before comparing.
No new file format. No plugins. PDF in, side-by-side report out.
Drop the old PDF and the new PDF. The tool reads every sheet in each set.
Match the sheets across revisions and align each pair — the tool absorbs scale and format changes. A view that moved? Mark it once and compare it in place.
A side-by-side report highlights what actually changed inside each view — not the noise from a shifted layout. Export to PDF and take it back into your normal workflow.
No account, no email. Drop two PDF revisions, or load the sample pair — the demo tool opens in your browser.
Engineers checking revisions before stamping. You need to be sure nothing slipped past the markup.
Construction project reviewers comparing consultant deliverables across issue dates.
Anyone who's received “what changed in rev C?” by email and dreaded opening both PDFs side by side.
Listed alphabetically. All four columns refer to the publicly documented compare features of each tool.
| Tool | Pixel overlay | Handles moved views | Handles resized sheets |
|---|---|---|---|
| Adobe Acrobat Pro — Compare | ✓ | — | — |
| Bluebeam Revu — Compare Documents | ✓ | — | — |
| Diffchecker — File diff | ✓ | — | — |
| Revisic | ✓ | ✓ | ✓ |
Based on each tool's publicly documented compare features. Compare-feature behaviour may change in later versions of those tools.
Same view-level comparison in every paid tier. Pay monthly, or switch to annual and get two months free.
Subscriptions aren't open yet — the demo is free to use now. Leave your email and we'll tell you the moment paid plans go live.
They do pixel overlay well, and for markup that's a solid workflow. Where they break down: any layout change between revisions makes overlay flag differences everywhere.
Revisic works at a different level — it understands which views correspond across revisions before comparing.
That's exactly what Revisic is built for. It matches views across revisions first, then compares the content inside them — so moving a view to another sheet or resizing the sheet to a different format doesn't produce a page full of false differences.
Revisic surfaces every geometric difference between two revisions — it doesn't judge which ones matter, that's left to you. It's tuned to err toward showing more rather than hiding something important.
It's standard-agnostic — no national rules baked in. It compares what's actually drawn on the page, so it works with any drawing convention. Built for engineering drawings, but works on any PDF.
Try the free demo with your own pair — no signup. It works best on vector PDFs exported from CAD/BIM; scans work too, but a skewed or blurry scan adds noise.
If your case isn't a fit, tell us — we look at real examples.
AI is genuinely powerful — but it can confidently miss or invent a change, and it needs a human to check. In drawings the cost of that error is high: it reaches the site.
Revisic doesn't interpret; it shows every geometric difference and leaves the call to you. Best results come from using both together.
No. Revisic surfaces what changed so you look in the right places faster. It is not a substitute for professional review, and you remain responsible for the drawings you stamp. See the Terms of Service.
A hand check of two large-format sheets is 10–20 minutes of strained attention per pair, and the eye tires exactly on the small stuff. Revisic does it in seconds. Even a single missed change can create rework that outweighs the subscription cost.
Files are processed on an EU server over an encrypted connection, are never shared between customers, and are deleted automatically a few hours after you stop working (within 48 hours at most). They are never used to train anything — we only keep anonymised technical data (timings, errors), never your drawings. Full detail in the Privacy Policy.
For teams that can't send files out at all, a local standalone version is coming — it runs on your machine and sends nothing.
Try the demo. If it saves you an hour, buy it.