白丁友记 vs 53Hz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
白丁友记
This app offers a slow-paced communication experience, allowing users to send physical letters, connect with pen pals, and share thoughts anonymously. It features a "walking letter" system, same-frequency matching, and a digital diary exchange.
- Send physical letters with virtual stamps
- Connect with real pen pals
- Anonymous "tree hole" for sharing thoughts
- Same-frequency matching to find like-minded users
- Drift bottle feature for sending/receiving messages
- Exchange diaries with a secret friend
- Virtual pet companions for emotional support
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【白丁 · 给这个快时代的一封慢信】 在这个什么都要"秒回"的世界，白丁想给愿意慢下来的人留一个角落。 ◆ 写一封会走路的信 挑选一张邮票，把心意装进信封。它在路上要走上一小段时间， 收信人拆开的那一刻，能闻到纸短情长。写信紧张？信使会把你的心意排好队。 ◆ 真人笔友，慢慢熟悉 不刷脸、不攀粉丝数，从一封信开始，认识一个愿意认真回信的人。 聊得来的人，可以一直写下去。 ◆ 匿名树洞 有些话，说给陌生人听刚刚好。写下来，会收到温柔的回声。 ◆ 同频匹配 写下一句真心话，在几千封信签里，遇见和你同频的人。 ◆ 漂流瓶 把心事装进瓶子抛进海里，也捡一捡别人的。漂了七天的瓶子，等你打开。 ◆ 交换日记 和一位秘友交换三十天日记，互相成为对方的阅读者。 ◆ 白丁伙伴 选一只伙伴：粘人的兔子、高冷的猫、元气的狗、撒娇的狐狸。 陪它，听它说心事，它也会替你保管今天的情绪。 ◆ 安静的小工具 写信、日记、清单、番茄钟，都在一个不打扰的角落。 —— 愿你我都能收到一封走了很久、却刚刚好在的信。
53Hz
Express your current thoughts and connect with others through algorithmically matched anonymous content. Unlock identities and start conversations only after mutual interest is shown, prioritizing genuine expression over popularity metrics.
- Publish dynamic thoughts
- Content-based matching
- Receive 6 matched recommendations
- Anonymous browsing
- Unlock identity upon mutual interest
- Private chat space
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53Hz 是一个基于“同频匹配”的表达与连接平台。 在这里，你只需要写下此刻的动态。 系统会通过算法，为你匹配 6 条与你内容高度相关的动态。 你看到的是匿名内容。 只有在你主动点亮之后，彼此才会解锁身份，并可以开启对话。 我们希望让连接回到内容本身，而不是关注数或点赞数。 —— 【核心功能】 • 发布动态，表达此刻想法 • 基于内容的同频匹配机制 • 每次获得 6 条同频推荐 • 匿名浏览，点亮后解锁身份 • 私密对话空间 —— 【拉一拉】 当首页没有同频内容时，可以通过“拉一拉”获取新的匹配。 系统会根据你的过往表达与互动记录，为你生成新的推荐。 —— 【Pro 会员（可选）】 • 查看你的同频档案 • 解锁更多表达方式（图片、语音等） • 更深入了解你的互动特征 53Hz 不追求热闹。 它更关注真实表达与自然共鸣。 写下此刻。 遇见同频。 Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: 白丁友记 at 4.0 against 53Hz's 3.2. 白丁友记 also leads on iOS requirement (15.0 vs 17.0). 53Hz's advantage is update cadence (every 2 days vs fortnightly) and ratings volume (5 vs 1). On price, review sentiment, ads and in-app purchases 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. 白丁友记 sells 3 one-off in-app purchases and 53Hz sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
白丁友记 holds the better App Store score, 4.0 against 3.2. That said, the two scores are not equally well evidenced: 53Hz has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
白丁友记 ships an update fortnightly, 53Hz every 2 days. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.
| Parameter | 白丁友记 | 53Hz |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | 3.2 (5 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 5 — better |
| Update frequency | Fortnightly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 54 MB | 198 MB |
| Age rating | 17+ | 17+ |
| Developer | 士诚 赵 | Haoqiang Chai |
Customer experience
白丁友记
53Hz
In-app purchases
白丁友记
- 邮票包$0.99
- 季会员$1.99
- 年会员$3.99
53Hz
- PRO 包月续费1 Month trial$1.991 Month
- 加油包$0.99
- PRO 月费$2.99
- PRO 年包$6.99
