测量工具 vs PD Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
测量工具
This utility app offers a suite of measurement tools for your phone. It includes a ruler, protractor, noise meter, distance calculator, level, compass, and flashlight. Easily measure lengths, angles, sound levels, and more with convenient on-the-go tools.
- Ruler (metric/inch)
- Noise meter (decibel)
- Protractor (camera-based)
- Distance measurement
- Level tool
- Compass
- Flashlight
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Measurement tools, eight sets of small tools. 1: the ruler to measure the length of the gadget, support metric and inch. 2 noise meter: through the phone to detect the surrounding sound decibel 3: get the object angle protractor tool, measured by the camera shooting. 4 paintings: calibration quick view home pendant is neat gadget. 5 measuring distance: input object height, accurate calculation of horizontal distance. 6 level: put the phone on the test object, you can know whether the level of small tools. 7 Compass: fast positioning precision gadget, no longer lost. 8 flashlight: a key to open the phone lights. A collection of a variety of gadgets function measurement tools, it contains a ruler, protractor, noise meter, measuring the distance of these conventional small features, and support level, compass, a flashlight, hang a picture to use it, calibration tools, user can really feel the heart of this product designers design. Measurement tool - really is a commonly used, put in the pocket gadget. QQ Group: 556446705 Welcome to join us and look forward to your suggestions and we will try our best to improve our products.
PD Meter
This application uses AI technology to measure interpupillary distance accurately. It offers a contactless method for measurement, avoiding close proximity required by traditional devices. Users can manually correct any AI recognition errors for precise results.
- AI-powered binocular interpupillary measurement
- Contactless measurement method
- High accuracy (0.1mm)
- Manual error correction
- Supports FPD and NPD measurements
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MEIDAI Interpupillometer is the world's first app which using AI technology for binocular interpupillary measurement. Using it can avoid the risk that traditional handheld interpupillometers requiring doctors and users facing each other in a extreme close distance (approximately 20cm). [Accuracy] 0.1mm [Result error] 0.3-0.5mm [Tips for use] For FPD measurement, focus at least 4 meters away. For NPD measurement, please follow the "distance reminder". [Steps] (1) Adjusting the face to the camera (2) Keep your face steady when prompted (3) Focus distance required to adjust sight * Use interpupillary distance for distance, look beyond the "tip arrow" to see the distance * Close to interpupillary distance, focus on "tip arrow" camera (4)) Click [Measure] to get interpupillary results (5) The errors in AI's pupil recognition can be corrected manually. For further technical support from professional organizations, please contact us: WeChat: 13957778558 Email: support@meidaitech.com Official Website: https://www.meidaitech.com
Screenshots
Verdict
The clearest difference is review sentiment: 测量工具 at 84% against PD Meter's 25%. 测量工具 also leads on rating (4.5 vs 2.0) and ratings volume (77 vs 4). PD Meter's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, update cadence, 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. Neither carries in-app purchases, so what you see is what you pay.
测量工具 holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: 测量工具 has 77 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 84% of 测量工具's written reviews are positive against 25% of PD Meter's.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.
| Parameter | 测量工具 | PD Meter |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (77 ratings) — better | 2.0 (4 ratings) |
| Positive reviews | 84.0% of reviews — better | 25.0% of reviews |
| Number of ratings | 77 — better | 4 |
| Update frequency | Monthly | Monthly |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 93 MB |
| Age rating | 4+ | 4+ |
| Developer | 飞剑 姚 | 杭州美戴科技有限公司 |
Customer experience
测量工具
PD Meter
In-app purchases
测量工具
No in-app purchases
PD Meter
No in-app purchases
