# Fast.io vs TrueFast

The clearest difference is update cadence: TrueFast at every 6 days against Fast.io's monthly. TrueFast also leads on iOS requirement (18.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Fast.io sells 1 one-off in-app purchase and TrueFast sells 6 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Fast.io ships an update monthly, TrueFast every 6 days. The most recent releases landed on September 21, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Fast.io | TrueFast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/truefast/id6762436547/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 6 days** |
| Monetization | — | Freemium |
| Size | 23 MB | 6 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Stefan Sturm](https://appshunter.io/developer/416803387) | [Evan Mattson](https://appshunter.io/developer/1887047359) |

## What reviewers say

### Fast.io

[App page](https://appshunter.io/ios/app/fastio-fasting-timer/id6755233993)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fast.io Pro | $6.99 | one-time |


### TrueFast

[App page](https://appshunter.io/ios/app/truefast/id6762436547)

Track your intermittent fasting journey with a clean, ad-free interface. Monitor your progress, set personalized goals, and access educational content. Offers seamless integration with Apple Watch and Lock Screen widgets for easy access.

**Highlights:** Fasting timer with elapsed and remaining time, Saved goals for common fasting plans, Schedules and reminders, History calendar, streaks, and badges, Lock Screen widgets and Apple Watch support, Fasting phase education, Local-first data storage

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TrueFast Pro Monthly | $2.99 | per month |
| TrueFast Pro Yearly | $19.99 | per year |
| Buy Us a Coffee | $1.99 | one-time |
| Power the Fast | $4.99 | one-time |
| Super Supporter | $9.99 | one-time |
| TrueFast Pro (Lifetime) | $29.99 | one-time |


## Frequently asked questions

### Is Fast.io free?

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

### Is TrueFast free?

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

### Do Fast.io or TrueFast have ads?

Neither Fast.io nor TrueFast shows ads.

### Which is updated more often, Fast.io or TrueFast?

Fast.io ships an update monthly, and TrueFast every 6 days. Most recently, Fast.io was updated on September 21, 2026 and TrueFast on September 15, 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.*