Ruler ++ vs 100cm 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.
100cm Ruler
This app provides a digital ruler for measuring the length and diameter of small objects directly on your device. It features a millimeter scale and allows for easy sliding to measure.
- Digital ruler functionality
- Millimeter scale
- Diameter measurement
- Screen sliding for measurement
- Ad removal option
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Plotting scale is useful to measure the length of small articles and insects. Squared in millimeters on the lower left, thus the diameter can be measured roughly. Hold the screen and slide your iPhone to the right. https://www.youtube.com/watch?v=kxU9xi88IiY Ads can be removed on "Info page".
Screenshots
Verdict
The clearest difference is rating: 100cm Ruler at 4.0 against Ruler ++'s 3.5. 100cm Ruler also leads on review sentiment (45% vs 15%). Ruler ++'s advantage is ratings volume (934 vs 1) and iOS requirement (8.0 vs 12.0). 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. Ruler ++ sells 1 one-off in-app purchase and 100cm Ruler sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
100cm Ruler holds the better App Store score, 4.0 against 3.5. That said, the two scores are not equally well evidenced: Ruler ++ has 934 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 15% of Ruler ++'s written reviews are positive against 45% of 100cm Ruler's.
Ruler ++ ships an update every 5 months, 100cm Ruler every 3 months. The most recent releases landed on September 26, 2026 and June 11, 2026 respectively.
| Parameter | Ruler ++ | 100cm Ruler |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (934 ratings) | 4.0 (1 ratings) — better |
| Positive reviews | 14.9% of reviews | 45.1% of reviews — better |
| Number of ratings | 934 — better | 1 |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 8.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 17 MB | 62 MB |
| Age rating | 4+ | 4+ |
| Developer | Fapps World et Cie S.E.C.S. | ZOOMO, Inc. |
Customer experience
Ruler ++
100cm Ruler
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
100cm Ruler
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ruler ++
- Advertisement-free upgrade$0.99
100cm Ruler
- Remove ADS$1.99
Questions
Is Ruler ++ free?
Is 100cm Ruler free?
Which has better reviews, Ruler ++ or 100cm Ruler?
Do Ruler ++ or 100cm Ruler have ads?
Which is updated more often, Ruler ++ or 100cm Ruler?
Other comparisons
