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Get Redpen on your computer.
Install it, open a set, and you are working. Sign in with your Redpen account to unlock Pro.
Windows
Windows 10 and 11, 64-bit. Installs for your user, no admin rights needed.
Download Redpen 0.7.9Released October 14, 2026
SHA-256 74aa22cb5b44bfd16701213fee491c313c399f785b81830aa235b713630a350a
Mac
macOS 12 or later.
Not sure which? Apple menu → About This Mac. “Chip: Apple M…” means Apple silicon.
What's new in 0.7.9
Merge branch 'main' of https://github.com/cooperhurt/redpendpdf
No drawings handy?
Try Redpen on our two-sheet sample set (floor plan and lighting plan, 1/4" = 1'-0").
1. Install
Run the installer. Redpen can become your default PDF app if you like.
2. Sign in
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3. Stay current
Redpen tells you when an update is ready and installs it when you say so.
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