# Castle Explorer vs Synodoss

The clearest difference is in-app purchases: Castle Explorer at none against Synodoss's 4. Castle Explorer also leads on iOS requirement (16.6 vs 26.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Synodoss sells 4 in-app purchases, starting at $18.99 per 7 days. Castle Explorer asks for nothing beyond the download.

Castle Explorer ships an update weekly, Synodoss every 4 days. The most recent releases landed on October 14, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Castle Explorer | Synodoss |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Size | 100 MB | 35 MB |
| Requires iOS | **16.6** | 26.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [richard prandini](https://appshunter.io/developer/321162688) | [VOWI](https://appshunter.io/developer/6796561749) |

## What reviewers say

### Castle Explorer

[App page](https://appshunter.io/ios/app/castle-explorer/id1661162772)

**Features:** macOS Compatibility

**In-app purchases:** none


### Synodoss

[App page](https://appshunter.io/ios/app/synodoss-connect-over-taste/id6806803824)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Synodoss Plus · 1 Week | $18.99 | per 7 days |
| Synodoss Plus · 1 Month | $49.99 | per month |
| Synodoss Plus · 6 Months | $99.99 | per 6 months |
| Synodoss Pro · 1 Year | $139.99 | per year |


## Frequently asked questions

### Is Castle Explorer free?

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

### Is Synodoss free?

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

### Do Castle Explorer or Synodoss have ads?

Neither Castle Explorer nor Synodoss shows ads.

### Which is updated more often, Castle Explorer or Synodoss?

Castle Explorer ships an update weekly, and Synodoss every 4 days. Most recently, Castle Explorer was updated on October 14, 2026 and Synodoss on October 26, 2026.

---

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