Valuday vs Erosion 蚀
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Valuday
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Was it worth the price? Valuday tracks the cost per day and cost per use of the things you own, and helps you pause before buying something new. Understand what you already own • Track long-term possessions by day, or log individual uses of shoes, cameras, classes and more. • Record when an item is idle, sold, given away, discarded, expired or retired. Sale proceeds reduce its net cost. • Add goals, notes and past usage records to see how value changes with use. Think before you buy Open the calculator in Settings, enter a price and your expected days or uses, and estimate the unit cost. Set an optional monthly spending allowance as a personal reference. Put uncertain purchases on the cooling-off list and decide after a waiting period. Your language, your currency Nine languages, regional number and date formats, and a choice of currencies. Records and totals stay separate by currency. Amounts are not automatically converted. Optional Pro features Item photos, custom widgets, CSV export, cost trends and item comparisons. Monthly and yearly subscriptions renew automatically; a lifetime purchase is also available. Manage or cancel subscriptions in your Apple account settings. Privacy matters No app account required. Records are stored on your device and use your private CloudKit database when iCloud is available. Photos remain on the device. No third-party ads, usage analytics or session replay. Privacy policy: https://www.real-tech.online/zhi-value-privacy.txt Terms of Use: https://www.real-tech.online/zhi-value-terms.txt
Erosion 蚀
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Erosion 是一款基于任务记录的专注工具。 应用采用“负向愿景”机制:通过呈现未完成任务所带来的结果变化,帮助用户更直观地理解时间与行动之间的关系。 在 Erosion 中,用户每天最多可以设置 3 个任务,并为每个任务分配专注时长。任务的完成或未完成,都会被记录并反馈到系统中。 应用的核心反馈方式为“日蚀状态”: - 当任务按计划完成时,日蚀程度减弱,秩序值提升 - 当任务未完成或被放弃时,日蚀程度加深,秩序值下降 这种可视化变化用于直观呈现任务执行情况,而不依赖传统的提醒或奖励机制。 主要功能包括: - 每日最多设置 3 个任务 - 支持专注时长记录 - 任务完成情况记录与展示 - 基于任务状态的日蚀变化反馈 - 简洁界面与低干扰设计 应用不提供复杂的激励或提醒功能,重点在于通过清晰的结果反馈,帮助用户专注于当前任务并理解执行情况。
Screenshots
Verdict
The clearest difference is in-app purchases: Erosion 蚀 at none against Valuday's 3. On price, update cadence, ads 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. Valuday sells 3 in-app purchases, starting at $0.99 per month. Erosion 蚀 asks for nothing beyond the download.
Valuday ships an update weekly, Erosion 蚀 fortnightly. Both last shipped on October 31, 2026.
| Parameter | Valuday | Erosion 蚀 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | 伟杰 袁 | 名哲 张 |
In-app purchases
Valuday
- Valuday Pro Monthly$0.991 Month
- Valuday Pro Yearly$5.951 Year
- Valuday Pro Lifetime$14.90
Erosion 蚀
No in-app purchases









