# Sunsync vs Anniversary Countdown Tracker

The clearest difference is iOS requirement: Sunsync at 15.6 against Anniversary Countdown Tracker's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 6, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Sunsync | Anniversary Countdown Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Size | 43 MB | 4 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Clusia LLC](https://appshunter.io/developer/1585054563) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## What reviewers say

### Sunsync

[App page](https://appshunter.io/ios/app/sunsync/id6469003195)

**Features:** macOS Compatibility

**In-app purchases:** none


### Anniversary Countdown Tracker

[App page](https://appshunter.io/ios/app/anniversary-countdown-tracker/id6772254699)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sunsync free?

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

### Is Anniversary Countdown Tracker free?

Anniversary Countdown Tracker is free to download, with no in-app purchases.

### Do Sunsync or Anniversary Countdown Tracker have ads?

Neither Sunsync nor Anniversary Countdown Tracker shows ads.

### Which is updated more often, Sunsync or Anniversary Countdown Tracker?

Sunsync ships an update every 4 months, and Anniversary Countdown Tracker every 4 months. Most recently, Sunsync was updated on October 6, 2026 and Anniversary Countdown Tracker on September 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.*