# HydroAI vs Upster

The clearest difference is rating: HydroAI at 5.0 against Upster's 4.4. HydroAI also leads on monetization model (freemium vs subscription) and ads (none vs shown). Upster's advantage is update cadence (every 2 days vs every 3 weeks) and ratings volume (7 vs 1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. HydroAI sells 3 in-app purchases, starting at $9.99 per month and Upster sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

HydroAI holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Upster has 7 ratings behind it against 1, so its average is the more settled of the two.

HydroAI ships an update every 3 weeks, Upster every 2 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | HydroAI | Upster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydroai-hydration-tracker/id6676999718/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/upster-sit-less-move-more/id6763958930/reviews) |
| Number of ratings | 1 | **7** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | **Freemium** | Subscription |
| Size | 58 MB | 108 MB |
| Requires iOS | **13.4** | 16.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 12+ | 9+ |
| Developer | [Syncd Software LLC](https://appshunter.io/developer/1767900025) | [Oliver Welman](https://appshunter.io/developer/1879699392) |

## What reviewers say

### HydroAI

[App page](https://appshunter.io/ios/app/hydroai-hydration-tracker/id6676999718)

Effortlessly track your daily water intake and receive personalized reminders to stay hydrated. Simply answer a few questions about your goals, snap a photo of your drink, and view insightful progress reports. Achieve a healthier, more vibrant you with simple hydration management.

**Highlights:** AI-powered hydration analysis, Drink photo recognition, Personalized hydration goals, Progress tracking and insights, Customizable reminders, Effortless daily tracking

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $46.90 | per year |
| Pro Yearly | $59.99 | per year |


### Upster

[App page](https://appshunter.io/ios/app/upster-sit-less-move-more/id6763958930)

This app encourages regular movement breaks throughout the day by nudging users to stand up and walk. It gamifies the experience with collectible characters and streaks, ensuring honest progress through verified movement data.

**Highlights:** Movement nudges, Verified step breaks, Chair monster collection, Streak tracking, Apple Watch companion, Home screen widget

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Member | $7.99 | per month |
| Member | $34.99 | per year |


## Frequently asked questions

### Is HydroAI free?

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

### Is Upster free?

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

### Which has better reviews, HydroAI or Upster?

HydroAI is rated higher. HydroAI averages 5.0 out of 5 from 1 ratings, while Upster averages 4.4 from 7 ratings.

### Do HydroAI or Upster have ads?

Upster shows ads; HydroAI does not.

### Which is updated more often, HydroAI or Upster?

HydroAI ships an update every 3 weeks, and Upster every 2 days. Most recently, HydroAI was updated on October 30, 2026 and Upster on November 5, 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.*