# Flow Alert vs Water Snapshot

The clearest difference is in-app purchases: Flow Alert at none against Water Snapshot's 1. Water Snapshot's advantage is update cadence (every 3 weeks vs every 7 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Water Snapshot sells 1 one-off in-app purchase. Flow Alert asks for nothing beyond the download.

Flow Alert ships an update every 7 months, Water Snapshot every 3 weeks. The most recent releases landed on October 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Flow Alert | Water Snapshot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/water-snapshot/id6761510156/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 34 MB | 35 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shaina Schwartzel](https://appshunter.io/developer/1873818873) | [Andy Jordan](https://appshunter.io/developer/1890067775) |

## What reviewers say

### Flow Alert

[App page](https://appshunter.io/ios/app/flow-alert/id6758588550)

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

**In-app purchases:** none


### Water Snapshot

[App page](https://appshunter.io/ios/app/water-snapshot/id6761510156)

Access real-time river, lake, and reservoir data from trusted USGS sources. Monitor water levels, flow, temperature, and precipitation forecasts. Receive alerts for NWS flood warnings and track historical trends.

**Highlights:** View flow, elevation, and water temperature, Monitor rivers, lakes, and reservoirs, Track historical trends (24hr, 7-day, 30-day), See local weather and forecast precipitation, Receive NWS flood alert notifications, Set custom water condition alerts, Calculate % Full for reservoirs

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Water Snapshot Pro | $4.99 | one-time |


## Frequently asked questions

### Is Flow Alert free?

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

### Is Water Snapshot free?

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

### Do Flow Alert or Water Snapshot have ads?

Neither Flow Alert nor Water Snapshot shows ads.

### Which is updated more often, Flow Alert or Water Snapshot?

Flow Alert ships an update every 7 months, and Water Snapshot every 3 weeks. Most recently, Flow Alert was updated on October 26, 2026 and Water Snapshot on October 6, 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.*