# Dian Dian vs Chronion

The clearest difference is in-app purchases: Chronion at none against Dian Dian's 3. Chronion also leads on ads (none vs shown). Dian Dian's advantage is iOS requirement (15.0 vs 26.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Dian Dian sells 3 in-app purchases, starting at $1.99 per month. Chronion asks for nothing beyond the download.

Dian Dian ships an update every 5 days, Chronion every 3 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | Dian Dian | Chronion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 65 MB | 10 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Override SAS](https://appshunter.io/developer/1888186144) | [Marco Bormann](https://appshunter.io/developer/1893711045) |

## What reviewers say

### Dian Dian

[App page](https://appshunter.io/ios/app/dian-dian-year-tracker/id6761432329)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Yearly | $8.99 | per year |
| Premium Lifetime | $22.99 | one-time |


### Chronion

[App page](https://appshunter.io/ios/app/chronion/id6762303355)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Dian Dian free?

Dian Dian is free to download, with in-app purchases available.

### Is Chronion free?

Chronion is free to download, with no in-app purchases.

### Do Dian Dian or Chronion have ads?

Dian Dian shows ads; Chronion does not.

### Which is updated more often, Dian Dian or Chronion?

Dian Dian ships an update every 5 days, and Chronion every 3 days. Most recently, Dian Dian was updated on October 25, 2026 and Chronion on October 25, 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.*