# Visla GPS vs HydraAtlas

The clearest difference is in-app purchases: HydraAtlas at none against Visla GPS's 10. HydraAtlas also leads on update cadence (every 4 days vs every 11 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Visla GPS sells 10 in-app purchases, starting at $34.99 per year. HydraAtlas asks for nothing beyond the download.

Visla GPS ships an update every 11 days, HydraAtlas every 4 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | Visla GPS | HydraAtlas |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hydraatlas/id6749492232/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 4 days** |
| Monetization | — | Free |
| Size | 128 MB | 17 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Visla SRLS](https://appshunter.io/developer/1825164595) | [Kevin Bullock](https://appshunter.io/developer/1504358834) |

## What reviewers say

### Visla GPS

[App page](https://appshunter.io/ios/app/visla-gps/id6748318830)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annuale - 1 Dispositivo | $34.99 | per year |
| Annuale - 2 Dispositivi | $69.99 | per year |
| Annuale - 3 Dispositivi | $89.99 | per year |
| Annuale - 4 Dispositivi | $119.99 | per year |
| Annuale - 5 Dispositivi | $149.99 | per year |
| Annuale - 6 Dispositivi | $179.99 | per year |
| Annuale - 7 Dispositivi | $199.99 | per year |
| Annuale - 8 Dispositivi | $229.99 | per year |
| Annuale - 9 Dispositivi | $249.99 | per year |
| Annuale - 10 Dispositivi | $299.99 | per year |


### HydraAtlas

[App page](https://appshunter.io/ios/app/hydraatlas/id6749492232)

This app provides detailed flood risk information for any US location using official FEMA data. It offers real-time updates on stream gauges, weather alerts, and radar, helping users make informed decisions about potential flood hazards.

**Highlights:** FEMA flood zone mapping, USGS stream gauge readings, National Weather Service alerts, Interactive weather radar, Save monitored locations, Emergency preparedness info

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Visla GPS free?

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

### Is HydraAtlas free?

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

### Do Visla GPS or HydraAtlas have ads?

Neither Visla GPS nor HydraAtlas shows ads.

### Which is updated more often, Visla GPS or HydraAtlas?

Visla GPS ships an update every 11 days, and HydraAtlas every 4 days. Most recently, Visla GPS was updated on October 30, 2026 and HydraAtlas on October 30, 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.*