# Hydralert vs NutrientOS

The clearest difference is update cadence: Hydralert at every 2 days against NutrientOS's fortnightly. NutrientOS's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Hydralert sells 3 in-app purchases, starting at $2.99 per month and NutrientOS sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Hydralert against 5.0 for NutrientOS. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Hydralert ships an update every 2 days, NutrientOS fortnightly. The most recent releases landed on September 6, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Hydralert | NutrientOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydralert/id6468425578/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/nutrientos-calorie-tracker/id6765582312/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Fortnightly |
| Monetization | Freemium | Free with in-app purchases |
| Size | 69 MB | 22 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Colby Mehmen](https://appshunter.io/developer/1615430352) | [Jeremiyah Escobedo](https://appshunter.io/developer/1895999641) |

## What reviewers say

### Hydralert

[App page](https://appshunter.io/ios/app/hydralert/id6468425578)

Easily track your fluid intake, including water, caffeine, and alcohol, to maintain optimal hydration. Set personalized goals and gain insights into your hydration patterns with user-friendly analytics. Achieve your daily hydration targets with this intuitive health companion.

**Highlights:** Hydration tracking, Caffeine and alcohol monitoring, Customizable hydration goals, Insightful hydration analytics, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Annually | $9.99 | per year |
| Lifetime Access | $14.99 | one-time |


### NutrientOS

[App page](https://appshunter.io/ios/app/nutrientos-calorie-tracker/id6765582312)

Track your nutrition, understand your meals, and build healthier habits with food logging, macro and micronutrient tracking, and workout logging. Optional AI tools offer advanced guidance and insights for personalized wellness.

**Highlights:** Food diary with calories, macros, and micronutrients, Barcode and food search, Restaurant menu browsing, Fitness, hydration, and sleep tracking, AI meal scan, AI Coach for guidance, AI recipe builder

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atlas Pro Monthly | $7.99 | per month |
| Atlas Premium Monthly | $12.99 | per month |


## Frequently asked questions

### Is Hydralert free?

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

### Is NutrientOS free?

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

### Which has better reviews, Hydralert or NutrientOS?

Hydralert and NutrientOS are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Hydralert or NutrientOS have ads?

Neither Hydralert nor NutrientOS shows ads.

### Which is updated more often, Hydralert or NutrientOS?

Hydralert ships an update every 2 days, and NutrientOS fortnightly. Most recently, Hydralert was updated on September 6, 2026 and NutrientOS on September 19, 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.*