# Memorize Pi Digits vs AR鲁班尺

The clearest difference is rating: AR鲁班尺 at 4.9 against Memorize Pi Digits's 4.4. AR鲁班尺 also leads on ads (none vs shown) and price ($0.29 vs $4.99). On ratings volume, update cadence, in-app purchases and device support there is nothing between them.

Memorize Pi Digits costs $4.99 and AR鲁班尺 $0.29 up front. Memorize Pi Digits sells 1 one-off in-app purchase and AR鲁班尺 sells 7 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

AR鲁班尺 holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 155 and 82 respectively. Written reviews point the same way: 74% of Memorize Pi Digits's written reviews are positive against 94% of AR鲁班尺's.

Memorize Pi Digits ships an update every 5 months, AR鲁班尺 every 4 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Memorize Pi Digits | AR鲁班尺 |
| --- | --- | --- |
| Price | $4.99 | **$0.29** |
| Rating | [4.4 (155 ratings)](https://appshunter.io/ios/app/memorize-pi-digits-314/id1264340985/reviews) | **[4.9 (82 ratings)](https://appshunter.io/ios/app/ar/id1384164285/reviews)** |
| Number of ratings | **155** | 82 |
| Positive reviews | 74.4% of reviews | **93.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 103 MB | 105 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Oscar Tsang](https://appshunter.io/developer/416987065) | [桐明 陈](https://appshunter.io/developer/1197339496) |

## What reviewers say

### Memorize Pi Digits

[App page](https://appshunter.io/ios/app/memorize-pi-digits-314/id1264340985)

This app helps you memorize digits of Pi, offering up to one million digits for practice. It features a dark mode interface and a network competition mode for up to five players. Ideal for educational purposes and memory improvement.

**Highlights:** Memorize up to 1 million Pi digits, Dark mode UI design, Network competition mode (up to 5 players), Educational game for memory improvement, Track progress day by day

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove AD | $1.99 | one-time |


### AR鲁班尺

[App page](https://appshunter.io/ios/app/ar/id1384164285)

This app transforms your phone into a digital measuring tool, ideal for home buying, renting, and renovation. It offers customizable ruler lengths, unit conversions, and the ability to view CAD files and create floor plans. It also includes a feature to measure land area on a map.

**Highlights:** AR measurement with auspicious meanings, Customizable and preset ruler lengths, Multiple measurement units, View and analyze CAD files, Create floor plans, Map-based land area measurement

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月VIP会员 | $4.99 | per month |
| 年VIP会员 | $12.99 | per year |
| 移除广告 | $3.99 | one-time |
| 最长测量长度为2千米 | $4.99 | one-time |
| 46.08厘米尺长 | $4.99 | one-time |
| 50.4厘米尺长 | $4.99 | one-time |
| 解锁所有功能 | $19.99 | one-time |


## Frequently asked questions

### Is Memorize Pi Digits free?

Memorize Pi Digits costs $4.99, and also offers in-app purchases.

### Is AR鲁班尺 free?

AR鲁班尺 costs $0.29, and also offers in-app purchases.

### Which has better reviews, Memorize Pi Digits or AR鲁班尺?

AR鲁班尺 is rated higher. Memorize Pi Digits averages 4.4 out of 5 from 155 ratings, while AR鲁班尺 averages 4.9 from 82 ratings.

### Do Memorize Pi Digits or AR鲁班尺 have ads?

Memorize Pi Digits shows ads; AR鲁班尺 does not.

### Which is updated more often, Memorize Pi Digits or AR鲁班尺?

Memorize Pi Digits ships an update every 5 months, and AR鲁班尺 every 4 months. Most recently, Memorize Pi Digits was updated on November 6, 2026 and AR鲁班尺 on November 6, 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.*