100cm Ruler vs Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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".
Ruler
Transform your phone into a precise measuring tool. Accurately measure objects, surfaces, and distances using your screen or camera. Ideal for home, work, or on-the-go tasks, providing quick and reliable measurements.
- Measure objects on screen
- Switch between units (cm, mm, inches)
- Save and share measurements
- Easy-to-use interface
- Accurate and fast measurements
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Turn your phone into a powerful measuring device with our app. Measure objects, surfaces, and distances precisely using your screen or camera. Whether you’re at home, at work, or on the go — our product gives you accurate measurements in seconds. Main Features: • Measure objects directly on your screen • Switch between units (cm, mm, inches) • Save and share your measurements • Sleek and easy-to-use interface Why You’ll Love It: • Always have a ruler in your pocket • Ideal for DIY, design, school, or daily use • Accurate, fast, and convenient Subscription Details: • Weekly Plan: $4.99/week • Yearly Plan: $19.99/year with a 3-day free trial Payment will be charged to your iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours before the subscription ends. Manage or cancel your subscription anytime in your iTunes Account settings. Any unused portion of a free trial will be forfeited when a subscription is purchased. Privacy Policy: https://www.icloud.com/pages/06esymWNjEpTQKyTyk7xrSiLQ#Blank Terms of Use: https://www.icloud.com/pages/0b4ufgCLIPuBpn14hhoiELQOA#Blank_3
Screenshots
Verdict
The clearest difference is rating: Ruler at 5.0 against 100cm Ruler's 4.0. Ruler also leads on update cadence (every 2 days vs every 3 months) and ratings volume (5 vs 1). 100cm Ruler's advantage is monetization model (free with in-app purchases vs subscription) and iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases 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. 100cm Ruler sells 1 one-off in-app purchase and Ruler sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Ruler holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Ruler has 5 ratings behind it against 1, so its average is the more settled of the two.
100cm Ruler ships an update every 3 months, Ruler every 2 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | 100cm Ruler | Ruler |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 45.1% of reviews | — |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 3 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 62 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | ZOOMO Inc. | Myroslav Drozd |
In-app purchases
100cm Ruler
- Remove ADS$1.99
Ruler
- Smart Ruler3 Days trial$2.997 Days
- Smart Ruler3 Days trial$4.997 Days
- Smart Ruler3 Days trial$6.997 Days
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- Smart Ruler$9.991 Year
- Smart Ruler$14.991 Year
- Smart Ruler$19.991 Year
- Smart Ruler$24.991 Year









