Ruler® vs Chronicle (PLUM Study)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ruler®
This app provides a versatile toolkit for all your measurement needs. It includes a classic ruler, a tape measure, and a camera ruler for precise measurements. Easily switch between units and document your findings by adding measurements directly to photos.
- Classic ruler and tape measure
- Camera ruler mode
- Photo measures mode
- Dual unit support (inches/cm)
- Precision sliders for small objects
- Elegant and user-friendly interface
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Your Comprehensive Ruler Solution for Your Phone! Experience the ultimate ruler toolkit on your phone, featuring a classic ruler, a tape measure, and a camera ruler. Key Features: - Elegant Design: Enjoy a stylish and user-friendly interface for all your measurement needs. - Dual Units: Easily switch between inches and centimeters for versatile measuring. - Precision Sliders: Accurately measure small objects with intuitive sliders. - Camera Ruler Mode: Utilize your phone's camera to measure objects seamlessly. - Photo Measures Mode: Add measurement data directly to your photos for organized documentation. Make every measurement a breeze with our complete ruler solution! Download now for a sleek and efficient measuring experience. Terms Of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Chronicle (PLUM Study)
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Chronicle is a passive sensing application for behavioral research studies. Participants must first be enrolled in an approved research study and be possession of a unique enrollment link provided by the researcher in order to provide data. This application also queries, but does not collect step counts from HealthKit as a workaround to known SensorKit limitations.
Screenshots
Verdict
The clearest difference is in-app purchases: Chronicle (PLUM Study) at none against Ruler®'s 2. Chronicle (PLUM Study) also leads on update cadence (daily vs every 2 months). 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. Ruler® sells 2 in-app purchases, starting at $1.99 per 7 days. Chronicle (PLUM Study) asks for nothing beyond the download.
Ruler® ships an update every 2 months, Chronicle (PLUM Study) daily. The most recent releases landed on October 14, 2026 and September 29, 2026 respectively.
| Parameter | Ruler® | Chronicle (PLUM Study) |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (35K ratings) — better | — |
| Positive reviews | 21.9% of reviews | — |
| Number of ratings | 35K — better | — |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 22 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Tue Nguyen Minh | Methodic, Inc. |
Bugs and requests
Ruler®
Reported bugs
2 issues- Inconsistent measurements
- Compatibility issues with newer devices
Requested features
3 requests- Ability to switch between metric and imperial units without paying
- Improved accuracy for larger measurements
- Removal of time limits on free usage
Chronicle (PLUM Study)
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ruler®
- Ruler Pro (Weekly)3 Days trial$1.997 Days
- Pro Features$1.99
Chronicle (PLUM Study)
No in-app purchases
Questions
Is Ruler® free?
Is Chronicle (PLUM Study) free?
Do Ruler® or Chronicle (PLUM Study) have ads?
Which is updated more often, Ruler® or Chronicle (PLUM Study)?
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