Millimeter Pro vs Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Millimeter Pro
This app transforms your device into a versatile measuring tool. It allows for precise measurements of length, area, diameter, and angles using the touchscreen. Easily split objects into equal parts and switch between millimeters and inches for your convenience.
- Touchscreen ruler and tape measure
- Measure length, area, diameter, and angles
- Split objects into equal parts
- Supports millimeters and inches
- Estimate radius
- Thread pitch gauge
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App blog: https://goo.gl/da6LdZ Millimeter Pro is an easy-to-use and helpful measurement tool for iPhone or iPad. It uses a touch screen as a ruler or tape measure to make quick measurements, split objects into equal parts, measure object ratio (W/H), measure area, estimate diameter and angles, and split circular objects into equal parts. Place an object on the screen and simply touch and move rulers to measure it. You can measure in different units: MILLIMETERS or INCHES. Features: - mm and inch units - 2D measurements: vertical and horizontal rulers - area calculation - ratio calculation (W/H) - split linear and circular objects into equal parts - shows the length and angle of each part - disable/enable touch screen (freeze feature) - diameter or radius estimation - angle measure with Protractor / Goniometer mode - Thread pitch gauge for TPI and pitch size measurements Use this app in different areas to measure small objects that fit within your phone or tablet screen: jewelry, rings, stones, gem, beads, screws, bolts, buttons, nuts, knitting needles, knitting patterns, washers, insects, mosaic tile, hooks, frame wrap angle, etc. Enjoy the app and Thank you for your interest and support! VisTech.Projects Team
Ruler
This utility app uses augmented reality to measure the length and area of real-world objects using your smartphone's camera. It offers unlimited measurements and an ad-free experience with premium subscriptions.
- Augmented reality measurement
- Measure length and area
- High precision with AR Kit
- Unlimited measurements (premium)
- Ad-free experience (premium)
- Subscription options available
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Ruler is the easiest and most accurate based on augmented reality. The app uses augmented reality technology(AR) to measure the real world object's area and length with your smartphone's camera. We have constantly improved this app since AR Kit was released which ensure the highest precision. Premium Services 1. Unlimited length Measurement. 2. Unlimited Area Measurement. 3. No Annoying ads. * Subscription is available like any ruler app. The payments will be charged to your iTunes account at confirmation of your purchase. * Subscription automatically renews for the same price and duration period as the original “one week”/”one month”/ unless auto-renew is turned off at least 24-hours before the end of the current period Our Standard Subscriptions are: 1. A one-week auto-renewal subscription with a 3-day trial period. 2. A one-month auto-renewal subscription with a 3-day trial period. Privacy Policy: https://sites.google.com/view/rulerios/terms-condition/privacy-policy Terms of Use: https://sites.google.com/view/rulerios/terms-condition
Screenshots
Verdict
The clearest difference is price: Ruler at Free against Millimeter Pro's $3.99. Ruler also leads on iOS requirement (11.0 vs 15.0). Millimeter Pro's advantage is in-app purchases (none vs 2) and ads (none vs shown). On rating, ratings volume, update cadence 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
Ruler is free to download; Millimeter Pro costs $3.99 up front. Ruler sells 2 in-app purchases, starting at $1.99 per 7 days. Millimeter Pro asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.4 for Millimeter Pro against 4.3 for Ruler. Both are backed by a comparable volume of ratings — 109 and 136 respectively. Written reviews are what separate them: 58% of Millimeter Pro's written reviews are positive against 33% of Ruler's.
Millimeter Pro ships an update every 4 months, Ruler every 7 months. Both last shipped on October 24, 2026.
| Parameter | Millimeter Pro | Ruler |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.4 (109 ratings) — better | 4.3 (136 ratings) |
| Positive reviews | 57.9% of reviews — better | 33.3% of reviews |
| Number of ratings | 109 | 136 — better |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | #186 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 24 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | VisTech.Projects LLC | MD KHAIRUL ISLAM |
Customer experience
Millimeter Pro
Ruler
In-app purchases
Millimeter Pro
No in-app purchases
Ruler
- Ruler Premium Weekly3 Days trial$1.997 Days
- Ruler Monthly Premium3 Days trial$5.991 Month









