# OptiUniverse vs Sideris

The clearest difference is in-app purchases: OptiUniverse at none against Sideris's 1. Sideris's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Sideris sells 1 one-off in-app purchase. OptiUniverse asks for nothing beyond the download.

OptiUniverse ships an update every 10 days, Sideris every 2 weeks. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OptiUniverse | Sideris |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Size | 421 MB | 137 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Maksim Doroshenko](https://appshunter.io/developer/1058512649) | [Loris BERT](https://appshunter.io/developer/6809145520) |

## What reviewers say

### OptiUniverse

[App page](https://appshunter.io/ios/app/optiuniverse/id6751552499)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sideris

[App page](https://appshunter.io/ios/app/sideris-sky-map-plate-solver/id6809145518)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Plate Solving | $9.99 | one-time |


## Frequently asked questions

### Is OptiUniverse free?

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

### Is Sideris free?

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

### Do OptiUniverse or Sideris have ads?

Neither OptiUniverse nor Sideris shows ads.

### Which is updated more often, OptiUniverse or Sideris?

OptiUniverse ships an update every 10 days, and Sideris every 2 weeks. Most recently, OptiUniverse was updated on October 24, 2026 and Sideris on October 31, 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.*