100cm Ruler vs AirRuler AR
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".
AirRuler AR
Measure distances and lengths using your device's camera. Simply tap the screen and move your phone to get accurate measurements on flat surfaces with good lighting. This tool is designed for quick and easy spatial calculations.
- AR measurement
- Tap-to-measure functionality
- Distance calculation
- Works on flat surfaces
- Requires ARKit
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Touch anywhere on screen and move your iPhone to measure the distance.It works better on flat surface with good light. This app will only work on iPhone6S or newer with ARKit.
Screenshots
Verdict
The clearest difference is in-app purchases: AirRuler AR at none against 100cm Ruler's 1. AirRuler AR also leads on rating (4.4 vs 4.0) and ratings volume (95 vs 1). 100cm Ruler's advantage is update cadence (every 3 months vs every 32 months) and review sentiment (45% vs 20%). On price, ads, device support 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. 100cm Ruler sells 1 one-off in-app purchase. AirRuler AR asks for nothing beyond the download.
AirRuler AR holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: AirRuler AR has 95 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 45% of 100cm Ruler's written reviews are positive against 20% of AirRuler AR's, so the app with the better star average is not the one people write more warmly about.
100cm Ruler ships an update every 3 months, AirRuler AR every 32 months. The most recent releases landed on October 14, 2026 and October 29, 2026 respectively.
| Parameter | 100cm Ruler | AirRuler AR |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) | 4.4 (95 ratings) — better |
| Positive reviews | 45.1% of reviews — better | 20.0% of reviews |
| Number of ratings | 1 | 95 — better |
| Update frequency | Every 3 months — better | Every 32 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 62 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | ZOOMO Inc. | Appulet, Inc |
Customer experience
100cm Ruler
AirRuler AR
In-app purchases
100cm Ruler
- Remove ADS$1.99
AirRuler AR
No in-app purchases
Questions
Is 100cm Ruler free?
Is AirRuler AR free?
Which has better reviews, 100cm Ruler or AirRuler AR?
Do 100cm Ruler or AirRuler AR have ads?
Which is updated more often, 100cm Ruler or AirRuler AR?
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