# 21 Day Container Tracker vs CalmRabbit

The clearest difference is in-app purchases: CalmRabbit at none against 21 Day Container Tracker's 3. 21 Day Container Tracker's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. 21 Day Container Tracker sells 3 in-app purchases, starting at $4.99 per 7 days. CalmRabbit asks for nothing beyond the download.

21 Day Container Tracker ships an update every 3 weeks, CalmRabbit monthly. The most recent releases landed on September 7, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | 21 Day Container Tracker | CalmRabbit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (510 ratings)](https://appshunter.io/ios/app/21-day-container-tracker/id994287813/reviews)** | — |
| Number of ratings | **510** | — |
| Positive reviews | 74.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Subscription | — |
| Size | 45 MB | 80 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Cube Software Solutions Inc.](https://appshunter.io/developer/994287812) | [Wan Chung Yau](https://appshunter.io/developer/1813380781) |

## What reviewers say

### 21 Day Container Tracker

[App page](https://appshunter.io/ios/app/21-day-container-tracker/id994287813)

This app helps users track their progress on a 21-day program. It allows for easy logging of containers, water intake, exercises, and body measurements. Visualize your journey with progress graphs and access an approved food list.

**Highlights:** Tap & Track™ container and water logging, Automatic container generation, Body Part Indicator™ measurements, Exercise tracking with custom options, Daily notes and body weight tracking, Progress graphs, Approved food list

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 21 Day Tracker Weekly | $4.99 | per 7 days |
| 21 Day Container Tracker Pro | $29.99 | per year |
| 21 Day Tracker Annual Pro | $29.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 📊 Helpful for tracking progress
- 🔍 Comprehensive food lists
- 🗓️ Convenient for daily tracking
- 💪 Supports various fitness programs

**What reviewers complain about**

- 💰 Paid subscription required
- 🔁 Resets data after each cycle
- 🚫 Limited customization options
- 📋 Lacks detailed food logging
- 🔔 Needs more notifications/reminders

**Reported bugs**

- Data loss when switching between cycles
- Compatibility issues with older devices
- Inconsistent container tracking behavior

**Requested features**

- Ability to manually enter food items
- Long-term data tracking and analytics
- Integration with other fitness apps
- Customizable container settings
- Meal planning and recipe suggestions


### CalmRabbit

[App page](https://appshunter.io/ios/app/calmrabbit/id6748315072)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 21 Day Container Tracker free?

21 Day Container Tracker is free to download, with in-app purchases available.

### Is CalmRabbit free?

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

### Do 21 Day Container Tracker or CalmRabbit have ads?

Neither 21 Day Container Tracker nor CalmRabbit shows ads.

### Which is updated more often, 21 Day Container Tracker or CalmRabbit?

21 Day Container Tracker ships an update every 3 weeks, and CalmRabbit monthly. Most recently, 21 Day Container Tracker was updated on September 7, 2026 and CalmRabbit on September 9, 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.*