# Cal Smart vs GulpGulp Water Tracker

The clearest difference is iOS requirement: Cal Smart at 15.5 against GulpGulp Water Tracker's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Cal Smart sells 3 in-app purchases, starting at $1.99 per 7 days and GulpGulp Water Tracker sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Cal Smart ships an update monthly, GulpGulp Water Tracker every 3 weeks. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Cal Smart | GulpGulp Water Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cal-smart/id6737219020/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Freemium | — |
| Size | 135 MB | 15 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jienan Yao](https://appshunter.io/developer/994410104) | [建锐 赵](https://appshunter.io/developer/6786929575) |

## What reviewers say

### Cal Smart

[App page](https://appshunter.io/ios/app/cal-smart/id6737219020)

Instantly analyze meals by taking a photo to get calorie and macronutrient breakdowns. Receive personalized health advice and track workouts for a holistic approach to wellness. View weekly reports to monitor progress and make informed dietary choices.

**Highlights:** Photo-based nutrient recognition, Personalized health advice, Integrated workout tracking, Weekly health reports, Simple and intuitive interface, Comprehensive health tracking

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cal Smart Membership | $1.99 | per 7 days |
| Cal Smart Membership | $6.99 | per month |
| Cal Smart Membership | $24.99 | per year |


### GulpGulp Water Tracker

[App page](https://appshunter.io/ios/app/gulpgulp-water-tracker/id6787708863)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Home Screen Widgets | $1.99 | one-time |


## Frequently asked questions

### Is Cal Smart free?

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

### Is GulpGulp Water Tracker free?

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

### Do Cal Smart or GulpGulp Water Tracker have ads?

Neither Cal Smart nor GulpGulp Water Tracker shows ads.

### Which is updated more often, Cal Smart or GulpGulp Water Tracker?

Cal Smart ships an update monthly, and GulpGulp Water Tracker every 3 weeks. Most recently, Cal Smart was updated on October 8, 2026 and GulpGulp Water Tracker on October 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.*