Double dummy problems vs 围棋之书
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Double dummy problems
Read full descriptionHide full description
To provide hundreds of double dummy bridge problems for you to solve. The app gives one solution, it is not the only one, you can work out your own solutions and save them.
围棋之书
Read full descriptionHide full description
这一款围棋软件是将日常的学习以及训练对弈结果为基础，通过统计和人工智能辅助给用户学习围棋的薄弱知识点,并给予加强练习,这款软件让用户专注于练习死活题,通过做题的积累以及难点分析,可以系统的学习围棋的知识要点，达成快速升级入段的学习目标！
Screenshots
Verdict
The clearest difference is ads: 围棋之书 at none against Double dummy problems's shown. Double dummy problems's advantage is iOS requirement (14.1 vs 16.6). On price, update cadence, in-app purchases 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
Both are free to download. Double dummy problems sells 1 one-off in-app purchase and 围棋之书 sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Double dummy problems ships an update every 3 weeks, 围棋之书 monthly. The most recent releases landed on September 9, 2026 and September 7, 2026 respectively.
| Parameter | Double dummy problems | 围棋之书 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 71.4% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.1 — better | 16.6 |
| Further details — not scored | ||
| Size | 27 MB | 72 MB |
| Age rating | 4+ | 4+ |
| Developer | 丽娜 夏 | 文艺 邓 |
In-app purchases
Double dummy problems
- You will pay to remove ads.$1.99
围棋之书
- 连续包月1 Month trial$2.991 Month
- 连续包年1 Year trial$29.991 Year
- 永久会员$24.99
