# ChatAI聊天 vs Ruler

The clearest difference is ads: Ruler at none against ChatAI聊天's shown. ChatAI聊天's advantage is update cadence (every 2 months vs every 5 months) and iOS requirement (10.1 vs 15.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ChatAI聊天 ships an update every 2 months, Ruler every 5 months. The most recent releases landed on October 26, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | ChatAI聊天 | Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.6 (40 ratings)](https://appshunter.io/ios/app/ruler-accurate-ruler/id1084232739/reviews)** |
| Number of ratings | — | **40** |
| Positive reviews | — | 54.2% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | — | Free |
| Size | 66 MB | 4 MB |
| Requires iOS | **10.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [新 张](https://appshunter.io/developer/766514344) | [祥祎 刘](https://appshunter.io/developer/1071522659) |

## What reviewers say

### ChatAI聊天

[App page](https://appshunter.io/ios/app/chatai/id767216349)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ruler

[App page](https://appshunter.io/ios/app/ruler-accurate-ruler/id1084232739)

This application provides a precise measurement tool by rendering according to your device's screen width specifications. It has been tested on a wide range of Apple devices to ensure accuracy for your measuring needs.

**Highlights:** Accurate screen-based rendering, Device-specific calibration, Wide device compatibility, Precise measurement tool

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✅ Accurate measurements compared to physical rulers
- 👍 Simple and intuitive user interface
- 🎯 No intrusive ads or minimal advertising
- ⚡ Fast and responsive performance
- 🆓 Free to use application

**What reviewers complain about**

- 🐛 Blank white screen on newer devices
- ❌ No support for iPhone 12 and newer models
- ❌ No support for iPhone X and iPhone 11
- 🔄 App not updated in years
- ⚠️ Device compatibility detection issues

**Reported bugs**

- White/blank screen display on newer iOS versions
- App crashes and freezes on launch
- Ruler not rendering or displaying
- Toggle switches stuck in grey/disabled state
- Incorrect device identification (iPad size misidentification)

**Requested features**

- Support for iPhone 12, 13, 14, 15, 16 and newer models
- Millimeter measurement option
- Longer ruler display
- Fractional inches (1/16, 1/8) instead of decimal inches
- Support for newer iPad models


## Frequently asked questions

### Is ChatAI聊天 free?

ChatAI聊天 is free to download, with no in-app purchases.

### Is Ruler free?

Ruler is free to download, with no in-app purchases.

### Do ChatAI聊天 or Ruler have ads?

ChatAI聊天 shows ads; Ruler does not.

### Which is updated more often, ChatAI聊天 or Ruler?

ChatAI聊天 ships an update every 2 months, and Ruler every 5 months. Most recently, ChatAI聊天 was updated on October 26, 2026 and Ruler on October 20, 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.*