# Fast Tracker vs Atomic Calories

The clearest difference is update cadence: Atomic Calories at weekly against Fast Tracker's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Fast Tracker sells 1 in-app purchase, starting at $2.99 per month and Atomic Calories sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Fast Tracker ships an update monthly, Atomic Calories weekly. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Fast Tracker | Atomic Calories |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (431 ratings)](https://appshunter.io/ios/app/fast-tracker-fasttrack/id1518096512/reviews)** | — |
| Number of ratings | **431** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 22 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [App Factory, LLC](https://appshunter.io/developer/1175925584) | [Eduardo Ferrari](https://appshunter.io/developer/1797054943) |

## What reviewers say

### Fast Tracker

[App page](https://appshunter.io/ios/app/fast-tracker-fasttrack/id1518096512)

This app simplifies intermittent fasting by allowing users to set custom fasting and eating windows. It provides timely alerts and tracks weight progress, making it ideal for beginners. It helps manage your fasting schedule with ease.

**Highlights:** Customizable fast and eating windows, Fasting and eating period timers, Start and finish fasting alerts, Weight tracking for progress, Simple and easy to use interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastTrack Premium Access | $2.99 | per month |

**What reviewers like**

- 👍 Simple and intuitive user interface
- ⏱️ Effective fasting and eating window tracking
- 💰 Completely free with no hidden charges
- 🔔 Helpful reminders and notifications
- 📊 Clear stats display on single screen

**What reviewers complain about**

- 💸 Recent paywall implementation for core features
- ⏳ Limited to 23.5 hour maximum fast duration
- 📝 Unable to edit weight entries after initial save
- 🔐 Difficult account cancellation process
- ⚠️ Lacks extended fasting support (36+ hours)

**Reported bugs**

- Weight input only accepts first 3 digits despite decimal point display
- Username validation prevents review submission
- Cannot retrieve fasting history without premium after update
- Unable to edit start time without paid subscription

**Requested features**

- Water intake tracking
- Extended fasting support (36+ hours, multi-day fasts)
- Calendar view for planning future fasts
- 30-minute pre-fast end notifications
- Ability to edit weight entries


### Atomic Calories

[App page](https://appshunter.io/ios/app/atomic-calories/id6749408081)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $9.99 | per month |
| Year Premiumm | $29.99 | per year |


## Frequently asked questions

### Is Fast Tracker free?

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

### Is Atomic Calories free?

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

### Do Fast Tracker or Atomic Calories have ads?

Neither Fast Tracker nor Atomic Calories shows ads.

### Which is updated more often, Fast Tracker or Atomic Calories?

Fast Tracker ships an update monthly, and Atomic Calories weekly. Most recently, Fast Tracker was updated on October 23, 2026 and Atomic Calories on October 18, 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.*