# Sigma vs Water Tracker CoffeeWatch

The clearest difference is in-app purchases: Sigma at none against Water Tracker CoffeeWatch's 3. Sigma also leads on review sentiment (87% vs 75%) and ratings volume (54 vs 7). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Water Tracker CoffeeWatch sells 3 in-app purchases, starting at $1.99 per 7 days. Sigma asks for nothing beyond the download.

Water Tracker CoffeeWatch holds the better App Store score, 4.6 against 4.4. That said, the two scores are not equally well evidenced: Sigma has 54 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 87% of Sigma's written reviews are positive against 75% of Water Tracker CoffeeWatch's, so the app with the better star average is not the one people write more warmly about.

Sigma ships an update weekly, Water Tracker CoffeeWatch every 5 days. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sigma | Water Tracker CoffeeWatch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (54 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews) | **[4.6 (7 ratings)](https://appshunter.io/ios/app/water-tracker-coffeewatch/id6748468232/reviews)** |
| Number of ratings | **54** | 7 |
| Positive reviews | **86.8% of reviews** | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | **Free** | Freemium |
| Size | 231 MB | 81 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) | [Shutong Technology](https://appshunter.io/developer/1803950076) |

## What reviewers say

### Sigma

[App page](https://appshunter.io/ios/app/sigma-ai/id6743433033)

This app offers a clean and engaging running experience with detailed analysis and personalized AI coaching. Track your runs, visualize your progress, and collect memories of your journeys on a unique map diary.

**Highlights:** Ad-free running experience, Daily, weekly, and monthly analysis, Map diary of runs and moods, AI-powered personalized coaching, Visualized calorie consumption, Data migration from popular wearables

**In-app purchases:** none


### Water Tracker CoffeeWatch

[App page](https://appshunter.io/ios/app/water-tracker-coffeewatch/id6748468232)

Monitor your caffeine intake and understand its impact on your body. Visualize your 24-hour metabolism curve and receive personalized insights to optimize focus and sleep.

**Highlights:** Real-time caffeine monitoring, 24-hour metabolism curve, One-tap drink logging, Caffeine trends and history, Sleep-friendly reminders, Apple Watch integration, Widgets and Lock Screen info

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caffeine Tracker Premium Week | $1.99 | per 7 days |
| Coffee Watch - Premium Year | $29.99 | per year |
| Caffeine Tracker LifetimeMembership | $39.99 | one-time |


## Frequently asked questions

### Is Sigma free?

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

### Is Water Tracker CoffeeWatch free?

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

### Which has better reviews, Sigma or Water Tracker CoffeeWatch?

Water Tracker CoffeeWatch is rated higher. Sigma averages 4.4 out of 5 from 54 ratings, while Water Tracker CoffeeWatch averages 4.6 from 7 ratings.

### Do Sigma or Water Tracker CoffeeWatch have ads?

Neither Sigma nor Water Tracker CoffeeWatch shows ads.

### Which is updated more often, Sigma or Water Tracker CoffeeWatch?

Sigma ships an update weekly, and Water Tracker CoffeeWatch every 5 days. Most recently, Sigma was updated on October 20, 2026 and Water Tracker CoffeeWatch on October 8, 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.*