# Fasting Center vs Formulate

The clearest difference is in-app purchases: Fasting Center at none against Formulate's 4. Fasting Center also leads on update cadence (every 3 days vs every 3 weeks) and device support (4 vs 2). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Formulate sells 4 in-app purchases, starting at $12.99 per month. Fasting Center asks for nothing beyond the download.

Fasting Center ships an update every 3 days, Formulate every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Fasting Center | Formulate |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (25 ratings)](https://appshunter.io/ios/app/fasting-center-fast-tracker/id6780227473/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 48 MB | 87 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Andrey Titov](https://appshunter.io/developer/6780227475) | [Jesse Guevara](https://appshunter.io/developer/6783192991) |

## What reviewers say

### Fasting Center

[App page](https://appshunter.io/ios/app/fasting-center-fast-tracker/id6780227473)

Plan extended fasts with personalized projections. Input your body stats and desired duration to estimate weight change, fat loss, and energy use. This data-driven tool provides a clear starting point for your fasting journey.

**Highlights:** Personalized fast planning, Extended fast duration options, Projected weight change, Estimated fat loss, Energy use projection, Data-driven starting point

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

**In-app purchases:** none


### Formulate

[App page](https://appshunter.io/ios/app/formulate-longevity-tracker/id6783192989)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Formulate+ Monthly | $12.99 | per month |
| Formulate++ Monthly | $12.99 | per month |
| Formulate+ Yearly | $89.99 | per year |
| Formulate++ Yearly | $119.99 | per year |


## Frequently asked questions

### Is Fasting Center free?

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

### Is Formulate free?

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

### Do Fasting Center or Formulate have ads?

Neither Fasting Center nor Formulate shows ads.

### Which is updated more often, Fasting Center or Formulate?

Fasting Center ships an update every 3 days, and Formulate every 3 weeks. Most recently, Fasting Center was updated on October 24, 2026 and Formulate on October 24, 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.*