Fast.io vs 75 Challenge Tracker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fast.io
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Fast.io is a beautifully simple intermittent fasting timer designed to help you stay consistent and focused on your fasting goals. Track your fast in real time, monitor hydration, and stay motivated with clear insights, widgets, and Live Activities. Perfect for popular fasting schedules like **16:8, 18:6, or OMAD**. #### TRACK YOUR FAST • Start fasting sessions with presets like 16:8, 18:6, or create custom fasting intervals • See elapsed time, remaining time, and fasting phases\ • Follow your fasting progress in real time #### TRACK YOUR WEIGHT • Sync weight with Apple Health • Monitor weight changes during fasting • Understand how fasting affects your body #### STAY CONSISTENT • Local reminders for fasting milestones • Daily hydration tracking • Motivation through achievements and streaks #### SEE YOUR PROGRESS • History with notes and mood tracking • Weekly, monthly, and yearly statistics • Understand and improve your fasting habits #### BUILT FOR APPLE DEVICES • Live Activities and Dynamic Island • Home Screen and Lock Screen widgets • Apple Watch companion app #### PRO FEATURES • One‑time purchase (no subscription) • Advanced customization • Extended fasting history Fast.io is designed to make intermittent fasting simple, beautiful, and effective.
75 Challenge Tracker
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.
- Daily habit tracking
- 75-Day streak monitoring
- Friend invitations for shared accountability
- Accountability reminders
- Progress visualization
- Customizable daily tasks
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Take on the 75-Day Challenge and transform your habits, discipline, and mindset — all with friends by your side. Endure is your daily habit tracker, streak keeper, and accountability partner for real change. The 75-Day Challenge is a mental toughness program designed to help you build discipline, consistency, and resilience. Over 75 consecutive days, you commit to completing daily tasks without skipping a day. Typical daily goals include: • Exercise twice a day (at least one outdoors) • Follow a structured nutrition plan • Drink plenty of water • Read personal development content • Take a progress photo The challenge is designed to push you mentally and physically. Miss a task, and the day doesn’t count, so staying consistent is key. Endure makes it easier by helping you track all tasks, monitor streaks, and stay accountable, especially when you do it with friends. Why Endure? • Daily Habit Tracker – log workouts, meals, water intake, reading, and progress photos • 75-Day Streaks – track your daily consistency • Friends & Community – invite friends, share progress, and motivate each other • Accountability Reminders – never miss a day • Progress Reports – visualize your transformation Who Is This For? • Anyone ready to take on a 75-day challenge • People who want to build discipline and mental toughness • Friends who want to do challenges together and stay accountable • Anyone committed to consistency, growth, and self-improvement How It Works • Start your 75-Day Challenge • Track daily habits: workouts, nutrition, water, reading, and progress photos • Invite friends for shared accountability • Celebrate milestones and maintain your streak • Complete 75 days and transform your life • Start the 75-Day Challenge today. Build habits, stay accountable, and endure it together. Terms of Service / EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Fast.io | 75 Challenge Tracker |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 26.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 23 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Sturm | Diego Gonzalez |
In-app purchases
Fast.io
- Fast.io Pro$6.99
75 Challenge Tracker
- Pro Monthly Subscription$1.991 Month





