Length vs Millimeter Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Length
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Turn your device into a ruler and measure small distances in either imperial inches or metric cm and convert any value between the two units. Features: - inch/cm converter for any arbitrary value - tap and drag the line to snap to multiple values of 0.05in (left side) or 0.1cm (right side) - supports the iPad Pro, iPad Mini and all iPhones - support for the iPad multitasking (split view..)
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
Screenshots
Verdict
The clearest difference is update cadence: Millimeter Pro at every 4 months against Length's every 11 months. Length's advantage is price ($0.99 vs $3.99) and iOS requirement (12.0 vs 15.0). On 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
Length costs $0.99 and Millimeter Pro $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Length ships an update every 11 months, Millimeter Pro every 4 months. The most recent releases landed on October 18, 2026 and October 20, 2026 respectively.
| Parameter | Length | Millimeter Pro |
|---|---|---|
| Price | $0.99 — better | $3.99 |
| Rating | — | 4.4 (109 ratings) — better |
| Positive reviews | — | 57.9% of reviews |
| Number of ratings | — | 109 — better |
| Update frequency | Every 11 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 34 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Piet Jonas | VisTech.Projects LLC |
In-app purchases
Length
No in-app purchases
Millimeter Pro
No in-app purchases
