# Fast.io vs 75 Challenge Tracker

The clearest difference is update cadence: 75 Challenge Tracker at every 3 days against Fast.io's monthly. 75 Challenge Tracker also leads on iOS requirement (17.6 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 75 Challenge Tracker sells 1 in-app purchase, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Fast.io ships an update monthly, 75 Challenge Tracker every 3 days. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Fast.io | 75 Challenge Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/75-challenge-tracker/id6757087060/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 23 MB | 3 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Sturm](https://appshunter.io/developer/416803387) | [Diego Gonzalez](https://appshunter.io/developer/836967202) |

## 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 Challenge Tracker

[App page](https://appshunter.io/ios/app/75-challenge-tracker/id6757087060)

This app helps you track and complete the 75-Day Challenge, a program designed to build discipline and resilience. Log daily habits, monitor streaks, and stay accountable with friends to achieve personal transformation.

**Highlights:** Daily habit tracking, 75-Day streak monitoring, Friend invitations for shared accountability, Accountability reminders, Progress visualization, Customizable daily tasks

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Subscription | $1.99 | per month |


## Frequently asked questions

### Is Fast.io free?

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

### Is 75 Challenge Tracker free?

75 Challenge Tracker is free to download, with in-app purchases available.

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

Neither Fast.io nor 75 Challenge Tracker shows ads.

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

Fast.io ships an update monthly, and 75 Challenge Tracker every 3 days. Most recently, Fast.io was updated on September 21, 2026 and 75 Challenge Tracker on June 1, 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.*