# Hydro vs StarLoc

The clearest difference is update cadence: Hydro at monthly against StarLoc's every 2 months. StarLoc's advantage is iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Hydro ships an update monthly, StarLoc every 2 months. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Hydro | StarLoc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/starloc/id6760946563/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | — | Paid |
| Size | 7 MB | 2 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Patrick](https://appshunter.io/developer/385768716) | [Daniel Schaich](https://appshunter.io/developer/1886958439) |

## What reviewers say

### Hydro

[App page](https://appshunter.io/ios/app/hydro-aquatic-data-hub/id6477622181)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### StarLoc

[App page](https://appshunter.io/ios/app/starloc/id6760946563)

This app provides precise GPS coordinates, altitude, and time data in a night-friendly interface for astronomers. It offers essential information for telescope alignment and observation, with a focus on preserving night vision.

**Highlights:** Night-friendly dark theme, Accurate latitude and longitude (DMS), Decimal coordinate support, Real-time GPS updates, Local, UTC, and offset time, Elevation in meters and feet, Horizontal and vertical accuracy

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydro free?

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

### Is StarLoc free?

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

### Do Hydro or StarLoc have ads?

Neither Hydro nor StarLoc shows ads.

### Which is updated more often, Hydro or StarLoc?

Hydro ships an update monthly, and StarLoc every 2 months. Most recently, Hydro was updated on October 8, 2026 and StarLoc on October 16, 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.*