Useful tools
Small tools, free for everyone
We build them for our own work and share them with everyone. Use them for anything — free and without sign-up.
3Tools
$0Forever
Free · No sign-up
Arc
Aspect ratio calculator for images and video. Change one side — the other recalculates instantly.
Presets: 16:9, 4:3, 1:1, 9:16
Ratio from any size
Frame, screen & phone preview
arc.vlthemes.me
Open tool
Free · No sign-up
Hotkey
Keyboard shortcut cheat sheets for the apps designers, engineers and developers use every day.
VS Code, Fusion 360, SolidWorks, NX
Bambu Studio
Windows & Mac
hotkey.vlthemes.me
Open tool
Free · No sign-up
LRC
Rivet length calculator: enter the stack thickness and diameter — get the right rivet length.
Works both ways: stack ↔ length
Standard lengths for the diameter
Comparison across all diameters
lrc.vlthemes.me
Open tool
Next tool?
Something you do by hand every week? Tell us — the best ideas become free tools.
Suggest an idea
01Why free
Free, for good
No trials, no paid tiers. If a tool saves you five minutes, it did its job.
No sign-up
Open the page and use it — no account, nothing to install.
Built from real needs
Each tool started as something we needed ourselves. Your ideas shape the next one.
Found them useful?
Share them with a friend or a colleague — that's the best thank-you. Hotkey and LRC grew out of our 3D & prototyping work.
