# SaturnMoons vs Sideris

The clearest difference is price: Sideris at Free against SaturnMoons's $2.99. Sideris also leads on update cadence (every 2 weeks vs every 26 months). SaturnMoons's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 15.0). On ads and device support there is nothing between them.

Sideris is free to download; SaturnMoons costs $2.99 up front. Sideris sells 1 one-off in-app purchase. SaturnMoons asks for nothing beyond the download.

SaturnMoons ships an update every 26 months, Sideris every 2 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SaturnMoons | Sideris |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/saturnmoons/id606938707/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 36 MB | 137 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guidebook Inc](https://appshunter.io/developer/1387977271) | [Loris BERT](https://appshunter.io/developer/6809145520) |

## What reviewers say

### SaturnMoons

[App page](https://appshunter.io/ios/app/saturnmoons/id606938707)

Explore Saturn's rings and moons with this interactive guide. Pinpoint the location of its largest moons and step through time to see their future positions. Discover fascinating facts and images of Saturn's unique lunar family.

**Highlights:** Locate Saturn's nine largest moons, Pinch-zoomable interface, Local time synchronization, Time controls (seconds, hours, days, years), Customizable telescope view, Encyclopedia of Saturn's moons, Stunning images of moons

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

**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 SaturnMoons free?

SaturnMoons costs $2.99, with no in-app purchases.

### Is Sideris free?

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

### Do SaturnMoons or Sideris have ads?

Neither SaturnMoons nor Sideris shows ads.

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

SaturnMoons ships an update every 26 months, and Sideris every 2 weeks. Most recently, SaturnMoons was updated on November 6, 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.*