HIIT Addict

Interval timer that draws each workout as colour blocks, with ERG control and GCN Training YouTube rides

Innovation: nearly 40 GCN Training YouTube workouts mapped by hand into a colour-block timeline that shows every effort coming up

Indie

Get it on Google Play

Visit hiitaddict.comReddit launch postSaved in this browser only
A HIIT Addict cycling workout on a phone: a large interval countdown under the colour-block profile, with target power, current watts and cadence, in a Play Store graphic.
HIIT Addict · play.google.com
A YouTube cycling workout in HIIT Addict: the video above its colour-block effort profile and a list of segments with RPE targets, in a Play Store graphic.
HIIT Addict · play.google.com

2 screenshots. Scroll or swipe sideways.

About

HIIT Addict is an interval timer that shows a workout as a row of colour blocks: width is duration, height and colour are effort, so you can see what's coming and how hard. For cycling, it connects to any Bluetooth FTMS smart bike or trainer and sets the resistance for each interval in ERG mode, with targets in watts or % of FTP; a Passive mode leaves the resistance to you. It has a built-in FTP ramp test, sprint tracking that warns when your power fades, and stars for staying on target. The Discover library holds cycling workouts such as VO2 Max, Tabata, Norwegian 4×4 and Sweet Spot, plus nearly 40 GCN Training YouTube videos with the block timeline added, which need an internet connection. Without a smart trainer you can follow the same workouts by effort on a 1–10 scale on any stationary bike. Also builds circuits and EMOMs for strength sessions. Bluetooth heart rate monitors connect too; the site doesn't mention ANT+. No virtual world, races or Strava sync. On Android now, with iPhone and iPad coming; a desktop web version needs a Pro account created in the mobile app. Made by Buchmann Digital.

Features

  • ERG mode
  • Workouts
  • Video
  • Dumb trainers

Other sports

  • Strength

In these lists

Changelog

  1. Google Play

    • Upload heart rate, power, cadence and other metrics to Intervals.icu
    • Save metrics as a .fit file for Strava and other services

  2. Google Play

    • Added FTP ramp test from 100 W with +20 W steps after a 5-minute warmup
    • Import of Zwift .zwo workout files, opening thousands of workouts
    • Redesigned bottom navigation tabs and a new minute/second duration picker
    and 4 more changes

  3. Google Play

    • Added FTP ramp test: 5 min warmup, then power rises 20 W each minute from 100 W
    • Redesigned bottom navigation tabs and modernized UI with restyled dialog buttons
    • New min/sec duration picker and a preference for default timer work/rest colors
    and 3 more changes

Summarized by AI from the published release notes; the link has the full notes. Checked 14 Nov 2026.

Sources

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  • Structured RideFree browser workout editor that converts between .zwo, .erg, .mrc and .fit, with a Bike Sim to ride the workouts on a smart trainer
  • TwinRideFree, ad-free app for riding with your club: ERG workouts, ghosts and shared journeys, without a 3D world
  • SweetWattMac app that runs ERG workouts from the MacBook notch while your show plays full screen
  • GradientLight Android app for ERG workouts, heart-rate rides and real climbs on a smart trainer, with no account and no internet access
  • parat.io workoutsERG workouts for FTMS smart trainers on iPhone and iPad, with no account and rides kept on the device

All training apps in the table