A tool for comparing screen-sizes and devices (to real scale) right on your display.
Hey everyone,
A few days ago I was stuck deciding between the 3.5" Flip V2 and the 4.0" RG40XXH. One thing I realized is that a lot of us compare devices online without actually having them in hand, which makes it surprisingly hard to visualize how different screen sizes and aspect ratios really feel.
I initially tried solving this myself by drawing the screens on my tablet using some basic trigonometry. But then I ran into another issue: the tablet canvas itself scales, so the measurements weren’t actually 1:1 with real life. Eventually, I calibrated everything manually using my tablet’s diagonal screen size just to get accurate dimensions.
It worked… but it was way more effort than it should’ve been.
So I ended up making a small tool called MeasureOnScreen.
The idea is simple:
- Enter a device’s screen size (diagonal)
- Choose the aspect ratio
- Instantly see the screen rendered at its actual real-world size
- Compare multiple devices side-by-side
The important part is that it calibrates itself based on the device you’re viewing it on. So whether you open it on a phone, tablet, monitor, or laptop, the scale adjusts accordingly to maintain a true 1:1 representation of the actual size in real life.
So if you’re debating between devices like:
- 3.5" vs 4"
- 4:3 vs 16:9
- Vertical vs horizontal handhelds
…you can actually see the difference before buying instead of relying only on specs or comparison videos.
It also works for full device dimensions if you want to compare ergonomics or overall footprint.
Actual 1:1 scaled screen sizes
You need to go to the screen estimator section for creating screens with diagonal lengths and aspect ratios.
I originally built it just for myself, but figured others here might find it useful too. Curious to know if there's something else that can be added.
tldr: A web tool (MeasureOnScreen) for comparing sizes of handhelds or their screen sizes to the actual scale, on any device.