OnceOne vs Chrono
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OnceOne
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With OnceOne, you can manage your to-do tasks offline or on multiple devices through iCloud. We provide a powerful filter function to help you quickly locate the task list that meets specific conditions. ## Core Features - To-do management - Custom filter list - Tomato countdown focus - Activity records - Data statistics and chart display Privacy policy: https://yindongliang.com/docs/App/OnceOne-Privacy-Policy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Chrono
This intelligent efficiency app integrates calendar management, task planning, and time tracking. It seamlessly syncs with iOS Calendar and Reminders for a fluid schedule. Gain insights into your time usage with efficiency analysis and multi-device synchronization.
- Integrated calendar and task management
- Seamless iOS Calendar & Reminders sync
- Event and habit tracking
- Customizable smart reminders
- Efficiency analysis with charts
- Multi-device synchronization (iPhone, iPad, Mac)
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Chrono是一款集「日程管理」「任务规划」「时间追踪」于一体的智能效率 App。 支持与 iOS 系统的「日历」和「提醒事项」无缝打通，让你的时间安排更加自然流畅。 功能亮点： • 日程与任务一体化：统一时间轴视图，清晰掌控每天安排。 • 系统级同步：与 iOS 日历和提醒事项双向同步，无需重复输入。 • 事件追踪：轻松记录项目进展、习惯或生活瞬间。 • 智能提醒：支持自定义通知，助你不错过任何关键任务。 • 效率分析：通过图表洞察时间使用与习惯趋势。 Chrono，不只是时间管理，更是你与系统完美协作的智能助手。
Screenshots
Verdict
The clearest difference is in-app purchases: Chrono at none against OnceOne's 3. OnceOne's advantage is update cadence (weekly vs every 3 months). 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. OnceOne sells 3 in-app purchases, starting at $0.99 per month. Chrono asks for nothing beyond the download.
OnceOne ships an update weekly, Chrono every 3 months. The most recent releases landed on September 20, 2026 and September 10, 2026 respectively.
| Parameter | OnceOne | Chrono |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Weekly — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Dongliang Yin | 雨辰 沈 |
In-app purchases
OnceOne
- Pro(Monthly)$0.991 Month
- Pro(Annual)$9.991 Year
- Pro(Lifetime)$24.99
Chrono
No in-app purchases
