Comparison

历史今天 vs π Pi Challenge

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

Head to head

Master the digits of Pi

Free

📚 Education

No ratingsView app →

About

历史今天

Features

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历史上的今天-Today On History 在我们生活中，日历是一个简单而重要的工具，只要翻开不同年份的日历，你会发现日期的排布总是一样的，在每一年我们都会经历相同的一天，就在这简单的一天里，在历史上曾经发生过许多不同寻常的事情，甚至是改变世界历史的事情。这些历史事件发生的时间和意义被牢牢地记录在历史书籍上，自己感兴趣的那一天里，在历史上都发生过什么重要的事情。可以设置到IOS Today Extension. 显示今天历史上发生的事件。中国历史朝代表，中国历史版图，世界历史版图。信息来源于互联网，仅供参考。历史上的今天-Today On History 1. 选择历史今天，中国历史朝代表，中国历史版图，世界历史版图。 2. 默认显示当天历史发生的事件。点击看详情。 3. 通过日历，选择日期，看指定日期发生的事件。 4. 通过ToDay 扩展设置，添加到通知，显示当天历史事件。

About

π Pi Challenge

Features

Read full description

An app for memorizing the digits of Pi. It supports up to 30 million digits… totally unnecessary, but fun. Comes with a ranking feature! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

历史今天4 screens

π Pi Challenge2 screens

Verdict

The call

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.

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

UpkeepUpdate frequency

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.

Scorecard4 real differences · 2 level

历史今天 versus π Pi Challenge: the parameters behind the verdict, then further details
Parameter	历史今天	π Pi Challenge
Price	Free	Free
Update frequency	Every 9 months	Every 2 months — better
Ads	No — better	Yes
In-app purchases	No — better	Yes
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	9.0 — better	13.0
Further details — not scored
Size	74 MB	73 MB
Age rating	4+	4+
Developer	涛殷	SIC Company Limited

In-app purchases

None

历史今天

No in-app purchases

1 purchases

π Pi Challenge

Subscriptions1

Monthly Subscription$0.991 Month

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.