---
title: "Ruler - CM, MM, Inches - Reviews, Revenue and Downloads in United Kingdom | Apple App Store"
description: "Ditch bulky tools! Measure lengths, widths, and diagonals precisely anywhere with just your phone.  *** Features ***  ► Smart Multi-Mode Measure     *  Switch units freely: cm/mm, inch/fractions, with"
---

# Ruler - CM, MM, Inches — United Kingdom
> CM, MM, In. Measure Anything.

![Ruler App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/0f/e7/87/0fe787c9-6bf7-0724-0e8e-f173dc3490f2/AnyIcon-0-0-1x_U007epad-0-1-0-sRGB-85-220.png/434x0w.png)

**Developer:** [Xi'an 7kit Technology Co](https://apptail.io/developer/xian-7kit-technology-co-HOl) (China)
**Category:** Utilities
**Rating:** 3.2/5 (13 ratings)
**Price:** Free
**Bundle ID:** com.softlibs.ios.ChiZi
**Store:** Apple App Store
**Country:** United Kingdom
**Version:** 26 (released 2025-10-03)
**Original Release:** 2015-08-12
**Languages:** English, Chinese

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/gb/app/app/id1022857549)
**AppTail Page:** [https://apptail.io/app/app-Tmvb/united-kingdom](https://apptail.io/app/app-Tmvb/united-kingdom)

## Ruler Description
Ditch bulky tools! Measure lengths, widths, and diagonals precisely anywhere with just your phone.

*** Features ***

► Smart Multi-Mode Measure
    *  Switch units freely: cm/mm, inch/fractions, with dual-unit display for instant comparison.
    *  Flexible starting points: Measure from screen edges or device edges for diverse scenarios.
    *  Full-direction coverage: Horizontal, vertical, or diagonal measurements. Paired with the 2.54m ultra-long scroll ruler, no corner is beyond reach!

► Zero-error Guarantee
    *  Auto-calibration tech: Dynamically adjusts based on device model, ensuring ≤1% error rate.
    *  Screen lock: Freeze measurements instantly to prevent accidental touches or slips.

► Auto-Renew VIP
    *  Member Perks: Ad-free
    *  Subscription Period: 1 month (auto-renewable)
    *  Subscription Price: Subject to the In-App Purchase (iAP) details, e.g. Auto-Renewable Subscription at $4.99/month

► Auto-Renewal Terms
    *  Payment: Will be charged to your Apple ID account at confirmation of purchase.
    *  Renewal: Your subscription will automatically renew, and your Apple ID account will be charged 24 hours before the end of the current period.
    *  Cancellation: To cancel your subscription, turn off auto-renewal at least 24 hours before the current period ends in your Apple ID account settings. You will retain access through the end of your paid billing period.
    *  Free Trial: Your free trial benefits will not be revoked if you choose to renew or cancel during the trial period. You may continue using the service until the trial ends.

► Terms of Use
    *  By downloading and using this app, you agree to Apple's End User License Agreement (EULA). Full terms at: 
    *  Privacy Policy: 

► Contact Us
    *  Email: ceo@7kit.cn

## Ruler Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/1f/2f/72/1f2f7290-5bfe-b630-0a98-35bf65444634/1.png/2732x2048.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/aa/da/87/aada8713-d25f-78ba-8237-ce8cf46e559c/2.png/2732x2048.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/57/0c/01/570c0118-9baa-8b0c-863a-e900b2baa719/3.png/2732x2048.png)

## Ruler Rating Breakdown in United Kingdom
- 5 stars: 5 (38%)
- 4 stars: 1 (8%)
- 3 stars: 2 (15%)
- 2 stars: 1 (8%)
- 1 stars: 4 (31%)

## Ruler Reviews in United Kingdom

### *---- "Too many ads"
Ads keep popping up, even can’t use it.
-- ChrisPW6, 2025-10-01

### *---- "Ads"
Ads keep popping up!!!
-- a19000a, 2022-08-14

### *---- "Advertisements"
Paid to remove advertisements, updated and now have adverts again without way to remove ? When is this going to be resolved ?

Thanks !
-- b348xyx, 2022-04-15

### ***-- "Calibration wrong on iPhone 13 mini"
I really like this app — it’s simple and clean-looking, and the ability to measure to the edge of the device is great. But there’s one big gotcha: on my iPhone 13 mini it over-estimates by about 13%. I’m sure it’s a screen resolution thing, but it would be great if we could calibrate this ourselves.

I agree with another reviewer that it would be nice to be able to scroll the crosshairs without them always being under your finger.
-- chazzo_b, 2021-11-21

### ***-- "Nearly great."
Firstly, as a ‘free’ app, it’s still very useful. Thanks for that. 

I’d be happy to purchase, but two aspects keep me from doing so:

- My main issue is ‘inches scaling’ options. Would it be possible to have imperial scaling (8ths and 16ths) on the ruler as an alternative? I live/work in the UK, and although I’m metric for 99% of my work, imperial does have its place/need from time to time. So many tools/parts are a mix of metric and imperial that this is lacking on this app. 

- Secondary issue is that I’d like the XY position lines to be able to be used ‘offset’ from your finger, so that you can actually see the numbers clearly as you move them around (I hope that makes sense) as currently your finger partially conceals the numbers..annoying if you want to be more accurate. 

Thanks again!
-- Anon81, 2021-09-17

### ***** "Crazy useful"
Meaning shopping for gloves a lot and this has been invaluable to get the right measurements without leaving the sofa.
-- Stefwanna, 2020-08-15

### ***** "Now excellent 👍"
Added feature to input required measurement, now this is great !

Ad’s seem to be gone too.

Thank you for an excellent app 👍👍

(Now one more feature to consider implementing - would be hiding ruler digits. To be able to still see ruler length marks, but turn off digits (numbers), so that you could focus on the shape better. This should be an option, not permanent)
-- .E.T., 2020-08-04

### ***-- "The program needs a addition ."
Like your program, but it needs a lot more.

Please add a click on every 1/10 of a inch..
In the setup.
-- Colin exhale, 2016-05-07

[View all Ruler reviews and detailed analytics on AppTail](https://apptail.io/account/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Ruler In-App Purchases
| Item | Price |
|------|-------|
| VIP | £4.99 |

## Ruler Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Free | Taiwan | Utilities | #427 |
| Top Free | Netherlands | Utilities | #484 |

## Ruler Discovered Keywords
- ruler app
- free ruler
- picture measure
- 尺子
- ruler cm

## Apps Similar to Ruler
- [Ruler®](https://apptail.io/app/ruler-Kqd/united-kingdom)
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- [Tape Measure™](https://apptail.io/app/tape-measure-eKm/united-kingdom)
- [尺子 AR 测量工具-专业的 测距仪 和 测距离](https://apptail.io/app/ar-TRm/united-kingdom)
- [Tape Measure & Ruler Арр](https://apptail.io/app/tape-measure-ruler-arr-jdr/united-kingdom)
- [Ruler, Measuring Tape - AR App](https://apptail.io/app/ruler-measuring-tape-ar-app-qKr/united-kingdom)
- [The Tape Measure & 3D Scanner](https://apptail.io/app/the-tape-measure-3d-scanner-mSy/united-kingdom)
- [Ruler •](https://apptail.io/app/ruler-FMic/united-kingdom)
- [Measuring Tape+ Measure AR app](https://apptail.io/app/measuring-tape-measure-ar-app-HMic/united-kingdom)

## Ruler Available In
- [China](https://apptail.io/app/app-Tmvb/china)
- [United States](https://apptail.io/app/app-Tmvb/united-states)
- [Taiwan](https://apptail.io/app/app-Tmvb/taiwan)
- [Russia](https://apptail.io/app/app-Tmvb/russia)
- [Australia](https://apptail.io/app/app-Tmvb/australia)
- [United Kingdom](https://apptail.io/app/app-Tmvb/united-kingdom)
- [Thailand](https://apptail.io/app/app-Tmvb/thailand)
- [Poland](https://apptail.io/app/app-Tmvb/poland)
- [Ukraine](https://apptail.io/app/app-Tmvb/ukraine)
- [Canada](https://apptail.io/app/app-Tmvb/canada)
- [Saudi Arabia](https://apptail.io/app/app-Tmvb/saudi-arabia)
- [Vietnam](https://apptail.io/app/app-Tmvb/vietnam)
- [Hong Kong SAR China](https://apptail.io/app/app-Tmvb/hong-kong)
- [Italy](https://apptail.io/app/app-Tmvb/italy)
- [India](https://apptail.io/app/app-Tmvb/india)
- [Türkiye](https://apptail.io/app/app-Tmvb/turkey)
- [Netherlands](https://apptail.io/app/app-Tmvb/netherlands)
- [Czechia](https://apptail.io/app/app-Tmvb/czechia)
- [Germany](https://apptail.io/app/app-Tmvb/germany)
- [South Korea](https://apptail.io/app/app-Tmvb/south-korea)
- [France](https://apptail.io/app/app-Tmvb/france)
- [Mexico](https://apptail.io/app/app-Tmvb/mexico)
- [Indonesia](https://apptail.io/app/app-Tmvb/indonesia)
- [Japan](https://apptail.io/app/app-Tmvb/japan)
- [Philippines](https://apptail.io/app/app-Tmvb/philippines)
- [Malaysia](https://apptail.io/app/app-Tmvb/malaysia)
- [Singapore](https://apptail.io/app/app-Tmvb/singapore)
- [Kazakhstan](https://apptail.io/app/app-Tmvb/kazakhstan)
- [Slovakia](https://apptail.io/app/app-Tmvb/slovakia)
- [Belgium](https://apptail.io/app/app-Tmvb/belgium)
- [Finland](https://apptail.io/app/app-Tmvb/finland)
- [Croatia](https://apptail.io/app/app-Tmvb/croatia)
- [Hungary](https://apptail.io/app/app-Tmvb/hungary)
- [Israel](https://apptail.io/app/app-Tmvb/israel)
- [Romania](https://apptail.io/app/app-Tmvb/romania)
- [Norway](https://apptail.io/app/app-Tmvb/norway)
- [Egypt](https://apptail.io/app/app-Tmvb/egypt)
- [New Zealand](https://apptail.io/app/app-Tmvb/new-zealand)
- [Azerbaijan](https://apptail.io/app/app-Tmvb/azerbaijan)
- [Argentina](https://apptail.io/app/app-Tmvb/argentina)
- [Peru](https://apptail.io/app/app-Tmvb/peru)
- [Chile](https://apptail.io/app/app-Tmvb/chile)
- [Spain](https://apptail.io/app/app-Tmvb/spain)
- [United Arab Emirates](https://apptail.io/app/app-Tmvb/united-arab-emirates)
- [Austria](https://apptail.io/app/app-Tmvb/austria)
- [Bulgaria](https://apptail.io/app/app-Tmvb/bulgaria)
- [Brazil](https://apptail.io/app/app-Tmvb/brazil)
- [Belarus](https://apptail.io/app/app-Tmvb/belarus)
- [Switzerland](https://apptail.io/app/app-Tmvb/switzerland)
- [Estonia](https://apptail.io/app/app-Tmvb/estonia)
- [Greece](https://apptail.io/app/app-Tmvb/greece)
- [Macao SAR China](https://apptail.io/app/app-Tmvb/macau)
- [Portugal](https://apptail.io/app/app-Tmvb/portugal)
- [Sweden](https://apptail.io/app/app-Tmvb/sweden)
- [Uzbekistan](https://apptail.io/app/app-Tmvb/uzbekistan)
- [South Africa](https://apptail.io/app/app-Tmvb/south-africa)
- [Latvia](https://apptail.io/app/app-Tmvb/latvia)
- [Nigeria](https://apptail.io/app/app-Tmvb/nigeria)
- [Luxembourg](https://apptail.io/app/app-Tmvb/luxembourg)
- [Lithuania](https://apptail.io/app/app-Tmvb/lithuania)
- [Nepal](https://apptail.io/app/app-Tmvb/nepal)
- [Sri Lanka](https://apptail.io/app/app-Tmvb/sri-lanka)
- [Panama](https://apptail.io/app/app-Tmvb/panama)
- [Lebanon](https://apptail.io/app/app-Tmvb/lebanon)
- [Cayman Islands](https://apptail.io/app/app-Tmvb/cayman-islands)
- [Pakistan](https://apptail.io/app/app-Tmvb/pakistan)
- [Kuwait](https://apptail.io/app/app-Tmvb/kuwait)
- [Bahrain](https://apptail.io/app/app-Tmvb/bahrain)
- [Paraguay](https://apptail.io/app/app-Tmvb/paraguay)
- [Iceland](https://apptail.io/app/app-Tmvb/iceland)
- [Ireland](https://apptail.io/app/app-Tmvb/ireland)
- [Ecuador](https://apptail.io/app/app-Tmvb/ecuador)
- [Armenia](https://apptail.io/app/app-Tmvb/armenia)
- [Algeria](https://apptail.io/app/app-Tmvb/algeria)
- [Slovenia](https://apptail.io/app/app-Tmvb/slovenia)
- [Dominican Republic](https://apptail.io/app/app-Tmvb/dominican-republic)
- [Suriname](https://apptail.io/app/app-Tmvb/suriname)
- [Denmark](https://apptail.io/app/app-Tmvb/denmark)
- [Tunisia](https://apptail.io/app/app-Tmvb/tunisia)
- [Cyprus](https://apptail.io/app/app-Tmvb/cyprus)
- [Colombia](https://apptail.io/app/app-Tmvb/colombia)
- [North Macedonia](https://apptail.io/app/app-Tmvb/north-macedonia)
- [Brunei](https://apptail.io/app/app-Tmvb/brunei)
- [Malta](https://apptail.io/app/app-Tmvb/malta)
- [Mauritius](https://apptail.io/app/app-Tmvb/mauritius)
- [Madagascar](https://apptail.io/app/app-Tmvb/madagascar)

---

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