# 历史今天 vs π Pi Challenge

The clearest difference is in-app purchases: 历史今天 at none against π Pi Challenge's 1. 历史今天 also leads on ads (none vs shown) and iOS requirement (9.0 vs 13.0). π Pi Challenge's advantage is update cadence (every 2 months vs every 9 months). On price and device support there is nothing between them.

Both are free to download. π Pi Challenge sells 1 in-app purchase, starting at $0.99 per month. 历史今天 asks for nothing beyond the download.

历史今天 ships an update every 9 months, π Pi Challenge every 2 months. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 历史今天 | π Pi Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 2 months** |
| Size | 74 MB | 73 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [涛 殷](https://appshunter.io/developer/478791127) | [SIC Company Limited](https://appshunter.io/developer/1800842356) |

## What reviewers say

### 历史今天

[App page](https://appshunter.io/ios/app/id1205402712)

**Features:** macOS Compatibility

**In-app purchases:** none


### π Pi Challenge

[App page](https://appshunter.io/ios/app/pi-challenge/id6756227034)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |


## Frequently asked questions

### Is 历史今天 free?

历史今天 is free to download, with no in-app purchases.

### Is π Pi Challenge free?

π Pi Challenge is free to download, with in-app purchases available.

### Do 历史今天 or π Pi Challenge have ads?

π Pi Challenge shows ads; 历史今天 does not.

### Which is updated more often, 历史今天 or π Pi Challenge?

历史今天 ships an update every 9 months, and π Pi Challenge every 2 months. Most recently, 历史今天 was updated on November 11, 2026 and π Pi Challenge on November 5, 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.*