Screen Ruler vs Calculate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Screen Ruler
Transform your iPhone or iPad into a digital ruler. Measure small objects directly on your screen using centimeters or inches, with magnifier assistance and haptic feedback for precise alignment. Calibrate the ruler for accurate results.
- Calibratable digital ruler
- Centimeter and inch scales
- Magnifier for precise alignment
- Haptic feedback
- Measure small objects on screen
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Turn your iPhone or iPad into a calibratable digital ruler for measuring small objects directly on the screen. Screen Ruler supports centimeters and inches, magnifier-assisted alignment, and haptic feedback. Measure Small Objects on Your Screen Use Screen Ruler for stationery, frames, craft materials, and other small objects that fit along your device screen. Place the object directly on the screen, move the measurement marks to its edges, and read the length. Core Features • Calibratable ruler: Match the scale to an object of known length and save calibration for your device. • CM and inch scales: Switch between centimeters and inches for everyday measurements. • Magnifier assist: Align measurement marks with object edges more confidently. • Haptic feedback: Feel subtle feedback while adjusting the marks. How to Get More Reliable Results For best results, place the object directly on the screen and check the scale against a known length. Calibrate the ruler if you notice an offset. Accuracy and Limitations Screen Ruler is designed for short, everyday measurements. Accuracy depends on device calibration, screen placement, and how precisely the marks are aligned. It does not use the camera or AR and is not intended for measuring rooms or large objects. Feedback: ankek1er@gmail.com
Calculate
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Calculate is a clean, considered calculator built for the moments when accuracy actually matters — quotes, budgets, splitting costs, or just double-checking a big number. NEVER RETYPE A NUMBER Every calculation is saved to your history. Tap any number from a past result to reuse it instantly in your next calculation — no more retyping long figures and risking a costly typo. CUSTOM MULTIPLIER SHORTCUT Long press the % button to set your own multiplier — perfect for adding taxes, applying a margin, or working out a discount, all with a single tap. CURRENCY MODE Press $ to round to two decimal places and format as currency, exactly how you'd write it. LOCK AND PIN WHAT MATTERS Swipe to lock a calculation so it never gets deleted. Pin your most important figures to keep them always within reach at the bottom of your history. BUILT TO FEEL RIGHT Satisfying haptic feedback on every key press, a refined near-black and brass design, and a calculator that feels like a quality tool — not a toy. Simple. Considered. Built for how you actually think through numbers.
Screenshots
Verdict
The clearest difference is in-app purchases: Calculate at none against Screen Ruler's 2. Calculate also leads on ads (none vs shown). Screen Ruler's advantage is device support (3 vs 1). On price and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Screen Ruler sells 2 one-off in-app purchases. Calculate asks for nothing beyond the download.
| Parameter | Screen Ruler | Calculate |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (26 ratings) — better | — |
| Positive reviews | 53.1% of reviews | — |
| Number of ratings | 26 — better | — |
| Update frequency | Every 3 months | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 18 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | 向阳 杨 | Simon Dinh |
In-app purchases
Screen Ruler
- Ads-free experience$1.99
- Support for a cup of coffee$2.99
Calculate
No in-app purchases









