# Inner Space vs SunSync

The clearest difference is in-app purchases: Inner Space at none against SunSync's 2. Inner Space also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.6). SunSync's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 7 months). On price there is nothing between them.

Both are free to download. SunSync sells 2 in-app purchases, starting at $1.99 per year. Inner Space asks for nothing beyond the download.

Inner Space ships an update every 7 months, SunSync every 3 weeks. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Inner Space | SunSync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Size | 129 MB | 22 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Inner Space](https://appshunter.io/developer/1471862476) | [Marta Rodriguez](https://appshunter.io/developer/1873973295) |

## What reviewers say

### Inner Space

[App page](https://appshunter.io/ios/app/inner-space/id6751198717)

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

**In-app purchases:** none


### SunSync

[App page](https://appshunter.io/ios/app/sunsync-circadian-tracker/id6762293528)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Year | $1.99 | per year |
| Lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Inner Space free?

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

### Is SunSync free?

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

### Do Inner Space or SunSync have ads?

Inner Space shows ads; SunSync does not.

### Which is updated more often, Inner Space or SunSync?

Inner Space ships an update every 7 months, and SunSync every 3 weeks. Most recently, Inner Space was updated on October 1, 2026 and SunSync on October 11, 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.*