The desktop app runs entirely on your machine: PDFs are opened in place, compared locally, and nothing is uploaded anywhere. It's free to download — the demo inside compares one sheet pair at a time, and a licence removes the limit.
Same application either way.
Installs per-user into your own profile — no admin rights required, works on locked-down corporate machines. Adds Start Menu shortcut, opens .revisic project files on double-click, and license activation links from email work with one click.
Unzip anywhere and run Revisic.exe. No installation, no registry changes. File associations and one-click activation links are not set up — you paste the license key into the app by hand instead.
Honesty over a paid badge, for now.
The beta build is not yet code-signed with an EV certificate (a paid identity check we'll complete as the product matures), so Windows SmartScreen may show "Windows protected your PC" the first time you run the installer. Click More info → Run anyway. To verify what you downloaded, compare its SHA-256 checksum with the one below — and the complete list of everything the app does on the network is below and ships with the app as NETWORK.txt.
a05e33b3bf6bf9cb18015f8e0f9bbf74a506c54bcf9985efb26540812e1b69f7502f8fc5b5a8bf64a533cc6898634af250d439a298c347fa6ddcb78a471adea3On Windows, check a downloaded file with PowerShell:
Get-FileHash -Algorithm SHA256 "$HOME\Downloads\Revisic-Setup.exe"
Exhaustive, and enforced by an automated test in the codebase.
Once when you enter a license key, then roughly monthly to renew the signed offline ticket. Sends the key, a random installation id (no hardware fingerprint) and the app version. No file names, no document data. Without a key: never.
Once per app start it fetches a small static version file from revisic.com — nothing about you or your session is sent. Turn it off in the License dialog and this request is never made.
No telemetry, no analytics, no crash reporting. The help video loads from youtube-nocookie.com only if you open Help. "Report a problem" builds a log archive locally and opens your email client — nothing is uploaded, and your drawings are never in it.
Nothing exotic.
Windows 10 (21H2+) or Windows 11, 64-bit. 8 GB RAM (16 GB recommended for 50+ sheet A1 sets — the comparison engine scales its memory use to what's available). About 600 MB of disk space, plus temporary files during comparison. Display from 1280×800; 100–150% scaling is fully supported. WebView2 Runtime is required — Windows 10/11 usually has it already, and the installer adds it automatically if missing.
The web demo runs one PDF pair with the same engine. No account needed.