# SAI Alerts vs Water Temperature

The clearest difference is price: SAI Alerts at Free against Water Temperature's $2.99. SAI Alerts also leads on update cadence (every 2 months vs every 14 months) and iOS requirement (13.4 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

SAI Alerts is free to download; Water Temperature costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SAI Alerts ships an update every 2 months, Water Temperature every 14 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | SAI Alerts | Water Temperature |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[3.8 (6 ratings)](https://appshunter.io/ios/app/water-temperature/id6477423920/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 16.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 14 months |
| Monetization | — | Paid |
| Size | 27 MB | 2 MB |
| Requires iOS | **13.4** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [SAI Groups](https://appshunter.io/developer/1582185208) | [Aaron Satterfield](https://appshunter.io/developer/525215472) |

## What reviewers say

### SAI Alerts

[App page](https://appshunter.io/ios/app/sai-alerts/id1582185206)

**Features:** macOS Compatibility

**In-app purchases:** none


### Water Temperature

[App page](https://appshunter.io/ios/app/water-temperature/id6477423920)

Monitor and record water temperatures directly from your Apple Watch. Get real-time readings, switch between units, and track your session duration. Ideal for water sports enthusiasts and anyone interested in water conditions.

**Highlights:** Real-time temperature monitoring, Fahrenheit/Celsius unit switching, Accurate temperature readings, Session timer, Min/Max temperature recording, Latest reading display, Dive Mode integration

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is SAI Alerts free?

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

### Is Water Temperature free?

Water Temperature costs $2.99, with no in-app purchases.

### Do SAI Alerts or Water Temperature have ads?

Neither SAI Alerts nor Water Temperature shows ads.

### Which is updated more often, SAI Alerts or Water Temperature?

SAI Alerts ships an update every 2 months, and Water Temperature every 14 months. Most recently, SAI Alerts was updated on November 3, 2026 and Water Temperature on November 4, 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.*