Comparison

UnDo vs Kotonemu

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

Head to head
About

UnDo

Features
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你是否已经厌倦了各种充满压迫感的 To-Do List 和打卡软件? 一旦中断就红牌警告,没完成任务就充满负罪感——这不该是管理生活的方式。 UnDo 是一款围绕“克制冲动”设计的轻量级应用。它不是监督你“要做什么”的严厉教练,而是一个帮你暂存冲动、拉开反应距离的“欲望降温箱”。 【核心功能】 欲望捕获与冷冻: 当冲动发生时(想冲动消费、想熬夜、想点高热量外卖),别急着行动,先把它写下来并放入“冰块”中冷冻。拉开距离,是化解冲动的第一步。 诚实的主动结算: 冷却期结束后,系统会轻量提示你回看并结清。结果只有两个:我破功了,或者我忍住了。 零压力的失败处理: 如果没忍住,点击“破功”,该记录会直接从本地数据中静默删除。我们不保留失败历史,不累计失败次数,拒绝给你增加羞耻感。 静谧的收集箱: 如果你成功克制了冲动,它将转化为美丽的琥珀,永久存入收集箱中。这里只记录成功,不记录失败。 【产品特色】 极简输入,支持快捷选项与照片附加。 灵活的自定义冷却时长(从 1 分钟到 24 小时)。 数据完全基于本地持久化存储,你的欲望和隐私只属于你自己。 在 UnDo,放下焦虑,享受没有压力的静谧胜利。 (推荐在iOS26进行使用,体验会更好)

About

Kotonemu

Features
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For nights when your thoughts will not stop. Kotonemu reads out unrelated words, one at a time, in a gentle voice. Apple. Umbrella. Mailbox. While you picture words that have nothing to do with each other, your brain cannot keep a chain of reasoning going. As that effort loosens, sleep arrives on its own. It is a direct implementation of the method known as cognitive shuffle. WHAT MAKES IT DIFFERENT - A different order every night. 600 words, chosen so that related ones never follow each other. No two words from the same category, and no two starting with the same sound. You will not learn the sequence. - It fades as it goes. Volume, the gap between words, and the reading speed all ease off over the session, so it keeps reaching you if you are still awake without waking you once you are not. BUILT NOT TO DISTURB - No ads. Nothing interrupts you. - No network. It works in airplane mode. - The screen dims by itself, and you can hide the words entirely. - Optional rain or ocean underneath. THE VOICE All 600 words were recorded by a voice actor. Nothing is synthesised. PRICING The app is free. All 600 words and the 10, 15 and 30 minute sessions stay free forever. For seven days you can also use every session length. After that, a single payment unlocks the 60 minute, 90 minute and unlimited sessions if you want them. There is no subscription. This app is not a medical device and is not intended to diagnose or treat insomnia. If sleeplessness persists, please consult a doctor. LINKS Support https://kotonemu.glspace.co.jp/support.html Privacy Policy https://kotonemu.glspace.co.jp/privacy.html Terms of Use https://kotonemu.glspace.co.jp/terms.html

Screenshots

UnDo4 screens
Kotonemu4 screens

Verdict

The call

The clearest difference is in-app purchases: UnDo at none against Kotonemu's 2. UnDo also leads on update cadence (weekly vs every 5 weeks). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Kotonemu sells 2 one-off in-app purchases. UnDo asks for nothing beyond the download.

UpkeepUpdate frequency

UnDo ships an update weekly, Kotonemu every 5 weeks. Both last shipped on October 31, 2026.

Scorecard2 real differences · 4 level
UnDo versus Kotonemu: the parameters behind the verdict, then further details
ParameterUnDoKotonemu
PriceFreeFree
Update frequencyWeekly — betterEvery 5 weeks
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhoneiPhone
Requires iOS17.617.0 — better
Further details — not scored
Size2 MB38 MB
Age rating4+4+
Developer朝峰 陈GYOU GI

In-app purchases

None

UnDo

No in-app purchases

2 purchases

Kotonemu

One-time2
  • At Your Ear$12.99
  • All Night$12.99

Questions

Is UnDo free?
UnDo is free to download, with no in-app purchases.
Is Kotonemu free?
Kotonemu is free to download, with in-app purchases available.
Do UnDo or Kotonemu have ads?
Neither UnDo nor Kotonemu shows ads.
Which is updated more often, UnDo or Kotonemu?
UnDo ships an update weekly, and Kotonemu every 5 weeks. Most recently, UnDo was updated on October 31, 2026 and Kotonemu on October 31, 2026.

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