Ruler ++ vs Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ruler ++
This app allows you to measure lengths accurately in both inches and centimeters. It provides a simple and straightforward tool for quick measurements.
- Measure in inches
- Measure in centimeters
- Accurate length measurement
- Simple interface
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Measure length in inches and cm.
Ruler
This application provides a precise measurement tool by rendering according to your device's screen width specifications. It has been tested on a wide range of Apple devices to ensure accuracy for your measuring needs.
- Accurate screen-based rendering
- Device-specific calibration
- Wide device compatibility
- Precise measurement tool
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You may already noticed that most of ruler apps are actually wrong. Accurate Ruler renders according to screen width spec of the device that your are currently using. So It is accurate. Already tested in following devices including: iPhone X, XR, XS, Max All sizes of iPad 2019 iPhone 4 iPhone 4s iPhone 5 iPhone 5s iPhone 5c iPhone 6 iPhone 6 plus iPhone 6s iPhone 6s plus iPhone se iPhone 7 iPhone 7 plus iPad 2 iPad 3 iPad 4 iPad air iPad air 2 iPad mini iPad min 2 iPad min 3 iPad mini 4 iPad pro, iPod Touch 5/6 If your device is one of them, we insure it is accurate.
Screenshots
Verdict
The clearest difference is rating: Ruler ++ at 3.5 against Ruler's 2.6. Ruler ++ also leads on ratings volume (934 vs 40) and iOS requirement (8.0 vs 15.6). Ruler's advantage is review sentiment (54% vs 15%) and in-app purchases (none vs 1). On price, update cadence, ads and device support 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. Ruler ++ sells 1 one-off in-app purchase. Ruler asks for nothing beyond the download.
Ruler ++ holds the better App Store score, 3.5 against 2.6. That said, the two scores are not equally well evidenced: Ruler ++ has 934 ratings behind it against 40, so its average is the more settled of the two. Written reviews complicate that: 15% of Ruler ++'s written reviews are positive against 54% of Ruler's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 17, 2026 and October 16, 2026 respectively.
| Parameter | Ruler ++ | Ruler |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (934 ratings) — better | 2.6 (40 ratings) |
| Positive reviews | 14.9% of reviews | 54.2% of reviews — better |
| Number of ratings | 934 — better | 40 |
| Update frequency | Every 5 months | Every 5 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 17 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Fapps World et Cie S.E.C.S. | 祥祎 刘 |
Customer experience
Ruler ++
Ruler
User reviews
Ruler ++
From 934 App Store ratingsWhat we love
- 👍 Simple and quick to use
- 👍 Includes both metric and Imperial measures
- 🚀 Great for wanting to measure displayed length
Room to improve
- 🐛 Measurements are not accurate
- 🐛 Ruler not matching real-world measurements
- 🐛 Ruler not scaling properly on different devices
- 🔋 Ads make it impossible to use
- 🔋 Constant, intrusive ads
Ruler
From 40 App Store ratingsWhat we love
- ✅ Accurate measurements compared to physical rulers
- 👍 Simple and intuitive user interface
- 🎯 No intrusive ads or minimal advertising
- ⚡ Fast and responsive performance
- 🆓 Free to use application
Room to improve
- 🐛 Blank white screen on newer devices
- ❌ No support for iPhone 12 and newer models
- ❌ No support for iPhone X and iPhone 11
- 🔄 App not updated in years
- ⚠️ Device compatibility detection issues
Bugs and requests
Ruler ++
Reported bugs
3 issues- Ruler markings are incorrect
- Ruler not displaying full length on screen
- Incompatible with newer iPhone models
Requested features
3 requests- Add ability to calibrate ruler for different devices
- Improve accuracy of measurements
- Reduce or remove ads
Ruler
Reported bugs
10 issues- White/blank screen display on newer iOS versions
- App crashes and freezes on launch
- Ruler not rendering or displaying
- Toggle switches stuck in grey/disabled state
- Incorrect device identification (iPad size misidentification)
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- Incompatibility with iOS 13.3 and newer
- Authenticator code clipboard access on launch
- Screen rotation issues
- Inaccurate ruler scaling on iPhone 8, 11, 12, 13, 16 Pro
- App requests rating before allowing use
Requested features
7 requests- Support for iPhone 12, 13, 14, 15, 16 and newer models
- Millimeter measurement option
- Longer ruler display
- Fractional inches (1/16, 1/8) instead of decimal inches
- Support for newer iPad models
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- Ability to disable ads
- Better device detection and compatibility
In-app purchases
Ruler ++
- Advertisement-free upgrade$0.99
Ruler
No in-app purchases
