MD Binary vs Bike Sizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MD Binary
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Check your bike's potential with the Binary system with a simple click! Calculate and set the optimal sprockets for your bike with the Binary Gear® system from MagneticDays. The app allows you to quickly and easily determine which types and sizes of optimal chainrings you should use on your bike fitted with the Binary Gear® system and the resulting metric ratio development, and compare it to the performance of a classic rear derailleur.
Bike Sizer
Find your ideal bicycle or optimize your current setup with AI-powered recommendations. Access a comprehensive bike database and generate detailed, exportable reports to improve your cycling performance.
- AI-driven bike sizing
- Extensive bike database
- Positioning enhancement
- PDF-exportable reports
- Cycling practice optimization
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Discover Bike Sizer, the ultimate app for cycling enthusiasts. With AI-driven algorithms, find the perfect bike or enhance your positioning. Explore an extensive database of recommended bikes and generate detailed, PDF-exportable reports for an optimal cycling experience. Download today and transform your cycling practice with Bike Sizer! This app uses Apple’s standard End User License Agreement (EULA). You can review these terms [here](https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)
Screenshots
Verdict
The clearest difference is in-app purchases: MD Binary at none against Bike Sizer's 1. MD Binary also leads on update cadence (every 4 days vs weekly) and iOS requirement (14.0 vs 17.0). 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. Bike Sizer sells 1 one-off in-app purchase. MD Binary asks for nothing beyond the download.
MD Binary ships an update every 4 days, Bike Sizer weekly. The most recent releases landed on June 8, 2026 and June 3, 2026 respectively.
| Parameter | MD Binary | Bike Sizer |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| Update frequency | Every 4 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 11 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | Marco Sbragi | TECHNOLOGIES KALIDA INC. |
In-app purchases
MD Binary
No in-app purchases
Bike Sizer
- session$2.99
