Simple Ruler
A screen ruler you can calibrate with any credit card
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Most of us have a ruler app we have never checked against a real ruler. Phones don't tell apps how big their screens physically are, so every screen ruler starts with a guess - on a recent iPhone Pro, an unchecked 10 cm can stretch to 10.6 cm. Simple Ruler fixes that in seconds with any credit card, then measures length, gaps, width x height and angles. Lay a screw or a SIM tray on the screen and read it in millimeters. Free with ads, offline, no account.
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PH · launched Oct 20, 2026 · 1 upvote (top 67%)
- Horizontal
- Prosumer
- Not AI
- Android
- Design Tools
- Productivity
- Home
Similar launches
See all 221 similar launches →Could you build this?
Yes A screen ruler calibrated against a credit card is a simple app. It needs a device display-dimension lookup table and a calibration screen, which a solo builder can assemble.
Competitors
Other products that read as similar to this one : 221 launches clear the similarity bar, closest 8 shown.
Attention rank: #88 of 222 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 340 days after the earliest competitor.
- Online Ruler · ph · 2026-10-23 · 1 upvotes · similarity 0.70
- Reaal Online Ruler · ph · 2026-10-02 · 1 upvotes · similarity 0.68
- DisplayMath · ph · 2026-10-07 · 1 upvotes · similarity 0.52
- Easy Scale Calc · ph · 2026-10-06 · 2 upvotes · similarity 0.49
- SizeCompared · ph · 2026-10-12 · 1 upvotes · similarity 0.46
- PdfRuler · ph · 2026-10-23 · 2 upvotes · similarity 0.45
- Scan or describe it. Get a 3D print · ph · 2026-09-26 · 1 upvotes · similarity 0.44
- RingSizeCharts · ph · 2026-10-16 · 2 upvotes · similarity 0.44
Other launches for this product
- No other launches for this product.