# Fast.io vs 75 Hard Challenge Day Tracker

The clearest difference is in-app purchases: 75 Hard Challenge Day Tracker at none against Fast.io's 1. 75 Hard Challenge Day Tracker also leads on update cadence (weekly vs monthly) and iOS requirement (17.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Fast.io sells 1 one-off in-app purchase. 75 Hard Challenge Day Tracker asks for nothing beyond the download.

Fast.io ships an update monthly, 75 Hard Challenge Day Tracker weekly. The most recent releases landed on September 21, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Fast.io | 75 Hard Challenge Day Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 23 MB | 67 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Sturm](https://appshunter.io/developer/416803387) | [Ngoc Truong](https://appshunter.io/developer/1837686613) |

## 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 |


### 75 Hard Challenge Day Tracker

[App page](https://appshunter.io/ios/app/75-hard-challenge-day-tracker/id6788652357)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fast.io free?

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

### Is 75 Hard Challenge Day Tracker free?

75 Hard Challenge Day Tracker is free to download, with no in-app purchases.

### Do Fast.io or 75 Hard Challenge Day Tracker have ads?

Neither Fast.io nor 75 Hard Challenge Day Tracker shows ads.

### Which is updated more often, Fast.io or 75 Hard Challenge Day Tracker?

Fast.io ships an update monthly, and 75 Hard Challenge Day Tracker weekly. Most recently, Fast.io was updated on September 21, 2026 and 75 Hard Challenge Day Tracker 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.*