# iF vs DoFast

The clearest difference is in-app purchases: DoFast at none against iF's 12. DoFast also leads on iOS requirement (15.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. iF sells 12 one-off in-app purchases. DoFast asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | iF | DoFast |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 45 MB | 8 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hans Babylone](https://appshunter.io/developer/1550504166) | [Igor Lenderman](https://appshunter.io/developer/1886154638) |

## What reviewers say

### iF

[App page](https://appshunter.io/ios/app/if-interfast/id1550503953)

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mediterranean Chicken | $0.99 | one-time |
| Fish Fillet in Tomatoes Garlic | $0.99 | one-time |
| Grilled Shrimp with Salsa | $0.99 | one-time |
| Salmon with Mango Salsa | $0.99 | one-time |
| Guacamole On Toast With Salad | $0.99 | one-time |
| Peppered Beef With Asparagus | $0.99 | one-time |
| Cauliflower Pizza | $0.99 | one-time |
| Chocolate Cupcake | $0.99 | one-time |
| Keto Pancake | $0.99 | one-time |
| Intermediate level | $2.99 | one-time |
| Experienced Level | $3.99 | one-time |
| Personalized & Statistics | $4.99 | one-time |


### DoFast

[App page](https://appshunter.io/ios/app/dofast-intermittent-fasting/id6760772207)

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

**In-app purchases:** none


## Frequently asked questions

### Is iF free?

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

### Is DoFast free?

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

### Do iF or DoFast have ads?

Neither iF nor DoFast shows ads.

### Which is updated more often, iF or DoFast?

iF ships an update every 2 months, and DoFast every 2 months. Most recently, iF was updated on October 8, 2026 and DoFast on October 16, 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.*