# Ruler® vs Chronicle (PLUM Study)

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.

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.

## The numbers

| Metric | Ruler® | Chronicle (PLUM Study) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (35K ratings)](https://appshunter.io/ios/app/ruler/id623207505/reviews)** | — |
| Number of ratings | **35K** | — |
| Positive reviews | 21.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 4 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tue Nguyen Minh](https://appshunter.io/developer/434811167) | [Methodic, Inc.](https://appshunter.io/developer/1618305706) |

## What reviewers say

### Ruler®

[App page](https://appshunter.io/ios/app/ruler/id623207505)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruler Pro (Weekly) | $1.99 | per 7 days |
| Pro Features | $1.99 | one-time |

**What reviewers like**

- 🚀 Accurate measurements
- 👍 Easy to use
- 🔍 Convenient for small items
- 📏 Useful ruler tool

**What reviewers complain about**

- 💰 Paywall for basic features
- ⏱️ Limited free usage time
- 🔍 Inaccurate for larger objects
- 🙅‍♀️ Aggressive monetization tactics

**Reported bugs**

- Inconsistent measurements
- Compatibility issues with newer devices

**Requested features**

- 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)

[App page](https://appshunter.io/ios/app/chronicle-plum-study/id6451158243)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ruler® free?

Ruler® is free to download, with in-app purchases available.

### Is Chronicle (PLUM Study) free?

Chronicle (PLUM Study) is free to download, with no in-app purchases.

### Do Ruler® or Chronicle (PLUM Study) have ads?

Neither Ruler® nor Chronicle (PLUM Study) shows ads.

### Which is updated more often, Ruler® or Chronicle (PLUM Study)?

Ruler® ships an update every 2 months, and Chronicle (PLUM Study) daily. Most recently, Ruler® was updated on October 14, 2026 and Chronicle (PLUM Study) on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*