Probability vs 百信吧
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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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.
百信吧
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百信吧 是由个人开发者独立设计与实现的一款轻量级即时通讯项目，旨在探索跨平台通信技术的实践与分享。前端采用 uniapp + Vue3，后端基于 ThinkPHP 框架，本应用无任何商业用途，数据均存储于用户本地或开发者自建服务器，代码结构清晰。
Screenshots
Verdict
The clearest difference is in-app purchases: 百信吧 at none against Probability's 1. 百信吧 also leads on update cadence (every 5 days vs every 10 days). On price, 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
Both are free to download. Probability sells 1 one-off in-app purchase. 百信吧 asks for nothing beyond the download.
Probability ships an update every 10 days, 百信吧 every 5 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | Probability | 百信吧 |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 10 days | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 14.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 166 MB | 70 MB |
| Age rating | 4+ | 17+ |
| Developer | Man Hung Sun | 君强 丁 |
In-app purchases
Probability
- Upgrade$0.99
百信吧
No in-app purchases
