# Bike Fast Fit > Bike Fast Fit is a family of three iOS bike-fitting apps by Double Dog > Studios, a small family studio. The apps read a rider's position from 240 fps > slow-motion video with markerless, cycling-trained AI and recommend specific > millimeter changes. Measurements are read at Maximum Knee Extension (MKE), not > Bottom Dead Center, and calibrated from the rider's crank length. The three apps (each a separate App Store download; iCloud data carries forward when you move up): - Bike Fast Fit EZ ($4.99/year): fast self-check at home. Side view, the big three measurements (saddle height, fore and aft, riding position). https://www.bikefastfit.com/apps/ez/ - Bike Fast Fit Elite ($19.99/year): the full self-fitting toolkit. Side and front view, the full measurement suite, analysis tools, reports. https://www.bikefastfit.com/apps/elite/ - Bike Fast Fit Pro ($99.99/year): the professional platform for fitters and bike shops. Adds rear view, LiveCheck real-time analysis, client records, and branded comparison reports. https://www.bikefastfit.com/apps/pro/ ## Key pages - Compare all three apps: https://www.bikefastfit.com/compare/ - Updates and release notes: https://www.bikefastfit.com/updates/ - About the studio: https://www.bikefastfit.com/about/ - Support: https://www.bikefastfit.com/support/ ## Learning - BFF Academy (free bike-fitting course, no signup required): https://academy.bikefastfit.com