定規(Ruler) vs Ruler 2.0
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
定規(Ruler)
A straightforward measuring tool for iPhones, offering accurate measurements in both millimeters and inches. It's designed for ease of use and provides a cool, functional experience for everyday measuring needs.
- Accurate measurements
- Millimeter display
- Inch display
- Supports all iPhone sizes
- Simple interface
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シンプルな定規、mmとinch表示で全てのサイズのiPhoneで正確に測れます。カッコいいでしょ You can measure correctly in iPhone with the size of everything by simple ruler, mm and inch indication. It would be cool
Ruler 2.0
This app provides a precise on-screen measuring tool for your iPhone or iPad. Easily measure length and width in centimeters, millimeters, or inches, with options to save measurements as photos and customize the ruler's appearance. It's designed for accurate, user-friendly measurements.
- On-screen ruler
- Measure length and width
- Centimeters, millimeters, inches
- Save measurements as photos
- 3 ruler color options
- Manual measurement adjustment
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Ruler 2.0 - ruler app for high measurement accuracy on the iPhone and iPad. Accurate, exact, precise, precision, correct, true, easy to use and free - these are the words that can describe this ruler app the best way. - Save the measurement as a photo - 3 colors of the ruler for your comfort - Centimeters, millimeters or inches - Measure the length only or width and length at the same time Tap on the measurement result to change it manually. Pan with two fingers anywhere on the screen for even higher accuracy. Measure every length and width with precision on-screen Ruler 2.0. Choose your preferred units of measurement - inches (inch), centimeters (cm) or millimeters (mm). Metric and Imperial systems are supported. Use on-screen ruler as you wish. Tap "Save" button to save the result to the Camera Roll of your device.
Screenshots
Verdict
The clearest difference is review sentiment: 定規(Ruler) at 80% against Ruler 2.0's 30%. 定規(Ruler) also leads on rating (5.0 vs 3.9). Ruler 2.0's advantage is ratings volume (205 vs 2) and iOS requirement (12.0 vs 15.6). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
定規(Ruler) holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Ruler 2.0 has 205 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 80% of 定規(Ruler)'s written reviews are positive against 30% of Ruler 2.0's.
定規(Ruler) ships an update every 6 months, Ruler 2.0 every 5 months. Both last shipped on October 24, 2026.
| Parameter | 定規(Ruler) | Ruler 2.0 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 3.9 (205 ratings) |
| Positive reviews | 80.0% of reviews — better | 29.6% of reviews |
| Number of ratings | 2 | 205 — better |
| Update frequency | Every 6 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Mayumi Kato | Oleg Osipov |
Customer experience
定規(Ruler)
Ruler 2.0
Bugs and requests
定規(Ruler)
Not enough reviews yet to summarise bugs or requests.
Ruler 2.0
Reported bugs
8 issues- Crashes after a few seconds
- Keeps crashing
- Wrong scale/dimension measurement on newer iPhones (13, 14, 15 series, SE 2022)
- Inches are too small (e.g., 1cm shows as smaller than 4mm)
- Measurements are off by about half
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- Screen scale wrong (1cm showing smaller than 4mm)
- Grid is shrunk on newer iPhones
- App frequently corrects '20' to '2.0'
Requested features
7 requests- Update for newer iPhone displays (high DPI)
- Manual adjustment for screen size/resolution
- Add option to manually enter dimensions
- Add inch fractions as measurement option
- Allow adjustable text font size when saving
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- Implement lighter background option (plain white)
- Make the measuring line not reset based on finger position
In-app purchases
定規(Ruler)
No in-app purchases
Ruler 2.0
No in-app purchases
