往日之事 vs Probability
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
往日之事
Explore significant historical events that occurred on any given day. Discover world-changing moments and see if any important dates align with your own birthday.
- Daily historical events
- World-changing historical moments
- Event significance
- Birthday date correlation
Read full descriptionHide full description
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，也许你会碰巧发现一些重要的历史事件发生的日期就是你出生的那一天,你感兴趣的一天
Probability
Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.
- Probability assessment
- Decision-making improvement
- Problem-solving formulas
- Personalized notes
- Dice and coin toss simulations
Read full descriptionHide full description
Probability is the key to making decisions under uncertainty, and with our app, you can improve your ability to assess probabilities and make better decisions in life. Our app includes different formulas to help you solve problems and make decisions, as well as the option to take references and write down your own notes about probability. Plus, you can have fun with probability by tossing dice and coins.
Screenshots
Verdict
The clearest difference is price: Probability at Free against 往日之事's $0.29. Probability also leads on update cadence (every 10 days vs every 9 months). 往日之事's advantage is in-app purchases (none vs 1). On review sentiment, ads, device support and iOS requirement 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
Probability is free to download; 往日之事 costs $0.29 up front. Probability sells 1 one-off in-app purchase. 往日之事 asks for nothing beyond the download.
往日之事 ships an update every 9 months, Probability every 10 days. Both last shipped on November 3, 2026.
| Parameter | 往日之事 | Probability |
|---|---|---|
| Price | $0.29 | Free — better |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 9 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 5 MB | 166 MB |
| Age rating | 4+ | 4+ |
| Developer | 伟 曹 | Man Hung Sun |
Customer experience
往日之事
Probability
In-app purchases
往日之事
No in-app purchases
Probability
- Upgrade$0.99
