Comparison

OnceOne vs Chrono

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

Head to head
About

OnceOne

Features
Read full description

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/

About

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.

Highlights
  • 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)
Features
Read full description

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

OnceOne3 screens
Chrono3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OnceOne sells 3 in-app purchases, starting at $0.99 per month. Chrono asks for nothing beyond the download.

UpkeepUpdate frequency

OnceOne ships an update weekly, Chrono every 3 months. The most recent releases landed on September 20, 2026 and September 10, 2026 respectively.

Scorecard2 real differences · 8 level
OnceOne versus Chrono: the parameters behind the verdict, then further details
ParameterOnceOneChrono
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyWeekly — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size3 MB8 MB
Age rating4+4+
DeveloperDongliang Yin雨辰 沈

In-app purchases

3 purchases

OnceOne

Subscriptions2
  • Pro(Monthly)$0.991 Month
  • Pro(Annual)$9.991 Year
One-time1
  • Pro(Lifetime)$24.99
None

Chrono

No in-app purchases

Questions

Is OnceOne free?
OnceOne is free to download, with in-app purchases available.
Is Chrono free?
Chrono is free to download, with no in-app purchases.
Do OnceOne or Chrono have ads?
Neither OnceOne nor Chrono shows ads.
Which is updated more often, OnceOne or Chrono?
OnceOne ships an update weekly, and Chrono every 3 months. Most recently, OnceOne was updated on September 20, 2026 and Chrono on September 10, 2026.

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