Comparison

ChatAI聊天 vs Ruler

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

超级直尺的测量工具

★ 2.640 ratingsView app →

About

ChatAI聊天

Features

Read full description

功能全面升级集合生活中常用功能。 ChatAI聊天：智能AI机器人帮你解决你想问的问题。直尺测量：可以测量物体长度。条码比价：生活中多了一个好帮手，有条码扫一扫，查价格。指南针：在野外辨别方位。噪音检测：检测声音大小。日历黄历：大节日，小节日，统统跑不掉。

About

Ruler

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

Read full description

You may already noticed that most of ruler apps are actually wrong. Accurate Ruler renders according to screen width spec of the device that your are currently using. So It is accurate. Already tested in following devices including: iPhone X, XR, XS, Max All sizes of iPad 2019 iPhone 4 iPhone 4s iPhone 5 iPhone 5s iPhone 5c iPhone 6 iPhone 6 plus iPhone 6s iPhone 6s plus iPhone se iPhone 7 iPhone 7 plus iPad 2 iPad 3 iPad 4 iPad air iPad air 2 iPad mini iPad min 2 iPad min 3 iPad mini 4 iPad pro, iPod Touch 5/6 If your device is one of them, we insure it is accurate.

Screenshots

ChatAI聊天4 screens

Ruler1 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level

ChatAI聊天 versus Ruler: the parameters behind the verdict, then further details
Parameter	ChatAI聊天	Ruler
Price	Free	Free
Rating	—	2.6 (40 ratings) — better
Positive reviews	—	54.2% of reviews
Number of ratings	—	40 — better
Update frequency	Every 2 months — better	Every 5 months
Ads	Yes	No — better
In-app purchases	No	No
Monetization	—	Free
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	10.1 — better	15.6
Further details — not scored
Size	66 MB	4 MB
Age rating	17+	4+
Developer	新张	祥祎刘

Bugs and requests

ChatAI聊天

Not enough reviews yet to summarise bugs or requests.

Ruler

Reported bugs

10 issues

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)

Show 5 more

Incompatibility with iOS 13.3 and newer
Authenticator code clipboard access on launch
Screen rotation issues
Inaccurate ruler scaling on iPhone 8, 11, 12, 13, 16 Pro
App requests rating before allowing use

Requested features

7 requests

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

Show 2 more

Ability to disable ads
Better device detection and compatibility

In-app purchases

None

ChatAI聊天

No in-app purchases

None

Ruler

No in-app purchases

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.