# OnceOne vs Chrono

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.

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.

## The numbers

| Metric | OnceOne | Chrono |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chrono/id6753885021/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | — | Free |
| Size | 3 MB | 8 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dongliang Yin](https://appshunter.io/developer/1030365061) | [雨辰 沈](https://appshunter.io/developer/1845477994) |

## What reviewers say

### OnceOne

[App page](https://appshunter.io/ios/app/onceone-grouping-to-do-tasks/id6744550176)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro(Monthly) | $0.99 | per month |
| Pro(Annual) | $9.99 | per year |
| Pro(Lifetime) | $24.99 | one-time |


### Chrono

[App page](https://appshunter.io/ios/app/chrono/id6753885021)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*