THE I/O vs didit.fyi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
THE I/O
Book challenging and surprising group fitness classes. Manage your personal details and access contact information easily. Discover more features and expect the unexpected.
- Book group fitness classes
- Manage personal details
- Access contact information
- Discover new features
- Challenging workouts
Read full descriptionHide full description
Experience THE I/O anytime, anywhere with our app. Book group classes designed to challenge you, move you, and surprise you; manage your personal details or easily access our contact information. And this is just the beginning… there’s so much more to discover! Expect The Unexpected - THE I/O
didit.fyi
Read full descriptionHide full description
You start a program. Week one goes great. Then life gets in the way—bad sleep, travel, stress—and the plan falls apart. didit makes sure it doesn't. Upload any training program as a PDF and the AI follows along, adjusting workouts when you miss sessions, switch gyms, or need extra recovery. No program? No problem—just start logging and the AI learns how you train and builds workouts for you. Smart workout generation Every session is tailored to your training history, recovery data, and what's actually going on in your life. Missed a day? The AI reshuffles. Feeling run down? It adapts. Just open the app and train. Effortless logging Weight, reps, done. Smart suggestions are pre-filled so logging takes seconds. Works with any equipment—barbells, cables, unitless machines, bodyweight—no friction. Journal for context Add notes about sleep, stress, or how you're feeling. The AI uses this to make better decisions about your training. Track your form Upload videos and photos tagged to specific exercises to monitor technique over time. Wearable integrations Connect WHOOP, Garmin, or Strava to add recovery and cardio context. The app works great without them too. Sync with Strava Automatically share completed workouts to your Strava feed. Bring your history Switching from another app? Import your data from Strong in seconds. More sources coming soon. Whether you follow a coach's program or let the AI guide you, didit removes the decision fatigue so you can just show up and lift. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: THE I/O at none against didit.fyi's 2. THE I/O also leads on iOS requirement (12.0 vs 15.1). didit.fyi's advantage is update cadence (every 3 weeks vs every 4 months). On price, ads 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. didit.fyi sells 2 in-app purchases, starting at $12.99 per month. THE I/O asks for nothing beyond the download.
THE I/O ships an update every 4 months, didit.fyi every 3 weeks. Both last shipped on October 24, 2026.
| Parameter | THE I/O | didit.fyi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (14 ratings) — better | — |
| Number of ratings | 14 — better | — |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 195 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | The IO | Mithras R&D AS |
In-app purchases
THE I/O
No in-app purchases
didit.fyi
- didit.fyi Premium$12.991 Month
- didit.fyi Premium$99.991 Year
