# Sum Hydration vs NotThat!

The clearest difference is update cadence: Sum Hydration at weekly against NotThat!'s every 2 months. Sum Hydration also leads on ratings volume (11 vs 2). On price, rating, ads and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Sum Hydration against 5.0 for NotThat!. That said, the two scores are not equally well evidenced: Sum Hydration has 11 ratings behind it against 2, so its average is the more settled of the two.

Sum Hydration ships an update weekly, NotThat! every 2 months. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Sum Hydration | NotThat! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (11 ratings)](https://appshunter.io/ios/app/sum-hydration/id6479608313/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/notthat/id6787238563/reviews) |
| Number of ratings | **11** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free | Free |
| Size | 61 MB | 35 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SUM LLC](https://appshunter.io/developer/1736501467) | [Niche Applications, LLC](https://appshunter.io/developer/6787238565) |

## What reviewers say

### Sum Hydration

[App page](https://appshunter.io/ios/app/sum-hydration/id6479608313)

This app allows users to connect to smart beverage dispensers to create personalized flavored water. Customize your drinks with various flavors and add nutrients like electrolytes and caffeine to meet your health goals. Track your hydration history and make secure payments for your orders.

**Highlights:** Connect via NFC/Bluetooth, Personalized flavor selection, Nutrient customization (electrolytes, caffeine), Order history tracking, Secure in-app payments

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### NotThat!

[App page](https://appshunter.io/ios/app/notthat/id6787238563)

Eliminate restaurant options quickly by comparing two choices at a time. This app helps you decide where to eat by repeatedly narrowing down your choices until a single winner remains. It also supports group decision-making for shared dining experiences.

**Highlights:** Compare two restaurants at a time, Eliminate unwanted choices, Group decision-making feature, Real-time voting for groups, View restaurant details (address, hours), Save favorite restaurants, View decision history

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

**In-app purchases:** none


## Frequently asked questions

### Is Sum Hydration free?

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

### Is NotThat! free?

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

### Which has better reviews, Sum Hydration or NotThat!?

Sum Hydration and NotThat! are both rated 5.0 out of 5 on the App Store, from 11 and 2 ratings respectively.

### Do Sum Hydration or NotThat! have ads?

Neither Sum Hydration nor NotThat! shows ads.

### Which is updated more often, Sum Hydration or NotThat!?

Sum Hydration ships an update weekly, and NotThat! every 2 months. Most recently, Sum Hydration was updated on October 9, 2026 and NotThat! on October 3, 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.*