Train smarter with HIIT Addict.
App coming second half of May 2025
Everything your training demands.
Built for athletes who want total clarity and control — from your first warm-up block to your final sprint.
Visual Interval Timeline
See the shape of your entire session before you start. Block height = intensity, block width = duration. No mental math — just better pacing and stronger finishes.
Custom Workout Builder
Chain warmups, cooldowns, work/rest intervals, and custom segments into complex routines. Optionally target intensity with RPE (1–10) or Heart Rate Zones (1–5).
Supercharged YouTube Workouts
Overlay visualization blocks on curated fitness videos. See the full intensity profile before you press play — no more surprises mid-set.
Heart Rate Zone Training
Connect a compatible Bluetooth HR monitor and train by zone. Avg, max, and time-in-zone stats are automatically saved after every session.
Discover Feed
Browse a growing weekly-curated library of HIIT, cycling, and interval videos — all pre-mapped with visualization blocks. One tap clones them into your library.
Desktop Mode (Pro)
Log in from any browser and follow YouTube workouts on your full screen. Maximum visibility, completely phone-free.
The Ultimate Fitness Hybrid
HIIT Addict is a 2-in-1 powerhouse: a professional-grade, highly customizable interval timer merged with a data-rich YouTube workout player that shows you exactly what's coming up, for how long, and how hard it'll be.
Powerful Interval Builder
Go beyond basic "on/off" timers. Chain together an unlimited number of blocks to create complex intervals, EMOMs, or custom circuits. If the workout is "time-based", HIIT Addict is for you. Perfect for Tabata, HIIT, intervals, EMOM, and custom circuits.
Supercharged YouTube Workouts*
With our segmented visualization, instantly see a detailed panel showing exactly what's coming up, for how long, and how hard they'll be. Choose from our curated selection (updated weekly), or build your own. GCN Training is not affiliated with HIIT Addict, but is a great source of workouts that can be compatible with HIIT Addict. * Not all YouTube workouts lend themselves well to this feature. However, we're always curating new ones which you will find in the Discover page.
Heart Rate Integration
Connect a compatible heart rate strap via Bluetooth to monitor your heart rate live. HIIT Addict tracks your zones throughout the session and automatically saves your average, max, and time-in-zone stats directly to your workout notes for deep progress analysis.
Desktop/Laptop Support (Pro version)
Pro users can sync their custom timers and YouTube workouts to the web version of HIIT Addict. (It's this website. Click 'Sign in' button above.) This is expecially useful when exercsing along to Youtube workouts on a larger screen.
Curated Discovery Feed
Access our "Discover" page for weekly curated timers and optimized YouTube workouts that include the segment visualizations. One tap clones them into your personal collection, allowing you to tweak and customize them to fit your specific goals.
Contact
Have a question or feedback? Want to be notified when HIIT Addict is ready? Send us a message.