# Fast vs STACK DAYS Elite Training

The clearest difference is iOS requirement: STACK DAYS Elite Training at 15.0 against Fast's 18.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Fast sells 8 in-app purchases, starting at $4.99 per month and STACK DAYS Elite Training sells 1 in-app purchase, starting at $249.00 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 1, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Fast | STACK DAYS Elite Training |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3.3K ratings)](https://appshunter.io/ios/app/fast-fasting-tracker-and-timer/id1545737691/reviews)** | — |
| Number of ratings | **3.3K** | — |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 116 MB | 52 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Maxima Apps](https://appshunter.io/developer/1153277200) | [Mobile Trainer, LLC](https://appshunter.io/developer/1793616106) |

## What reviewers say

### Fast

[App page](https://appshunter.io/ios/app/fast-fasting-tracker-and-timer/id1545737691)

This app helps you track intermittent fasting routines, monitor progress, and analyze health data. It offers educational content, motivational challenges, and a journal to record your feelings. Connect with friends for support and motivation on your wellness journey.

**Highlights:** Fasting timer and tracker, Progress analytics and history, Educational 'Know It' section, Motivational challenges and trophies, Mood tracker and journal, Health app integration (steps), Fasting buddy feature

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fast Premium Monthly | $4.99 | per month |
| Fasting Monthly | $14.99 | per month |
| Fasting Annually | $19.99 | per year |
| Fasting Premium | $27.99 | per 3 months |
| Fast Premium Yearly | $29.99 | per year |
| Fasting Premium Yearly | $39.99 | per year |
| Fasting One Time Special Offer | $19.99 | one-time |
| Fasting Pro | $49.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Helpful for weight loss
- 👍 Motivating with trophies
- 👍 Customizable fasting plans
- 👍 Integrates with health apps

**What reviewers complain about**

- 🐛 Timer issues/inaccuracies
- 🐛 Inability to edit fasting times
- 🐛 Syncing/data saving problems
- 🐛 Crashes and glitches
- 🔍 Lacking advanced features

**Reported bugs**

- Timer not accurately recording fasting times
- Inability to update weight in app
- Crashing when trying to view friend's status

**Requested features**

- Option to edit fasting start/end times
- More detailed analytics and progress tracking
- Improved syncing and data saving reliability
- Expanded customization options


### STACK DAYS Elite Training

[App page](https://appshunter.io/ios/app/stack-days-elite-training/id6741225635)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| STACK PRO | $249.00 | per month |


## Frequently asked questions

### Is Fast free?

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

### Is STACK DAYS Elite Training free?

STACK DAYS Elite Training is free to download, with in-app purchases available.

### Do Fast or STACK DAYS Elite Training have ads?

Neither Fast nor STACK DAYS Elite Training shows ads.

### Which is updated more often, Fast or STACK DAYS Elite Training?

Fast ships an update every 2 months, and STACK DAYS Elite Training every 2 months. Most recently, Fast was updated on October 1, 2026 and STACK DAYS Elite Training on September 20, 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.*