Cyclone

Phone app for FTMS smart trainers: free rides with live power, ERG workouts and multi-week plans by subscription

Innovation: multi-week FTP, sweet spot and base plans that queue each session on the phone, with no account and no data collected

Indie

Download on the App StoreGet it on Google Play

Visit arksigma.comSaved in this browser only
Cyclone's Free Ride screen: 218 watts, heart rate, cadence, speed, distance and time above a live power graph, with buttons to change the trainer's resistance.
ArkSigma · arksigma.com
Training plans in Cyclone: a 4-week FTP Builder, a 4-week Sweet Spot plan and an 8-week Base Builder, each with a Start Plan button, in an App Store graphic.
ArkSigma (App Store) · apps.apple.com
Cyclone's workout builder: warm-up, interval and cooldown segments, each with minutes, seconds and a % of FTP target, in an App Store graphic.
ArkSigma (App Store) · apps.apple.com
A finished ride in Cyclone: time in each power zone, a power curve from 1 second to 30 minutes, and an Export TCX button.
ArkSigma · arksigma.com

4 screenshots. Scroll or swipe sideways.

About

Cyclone is an iPhone and Android app for Bluetooth FTMS smart trainers. Free Ride shows live power, cadence, speed, distance and heart rate with a rolling power chart and buttons to change the trainer's resistance. Structured workouts run in ERG mode with each segment set as a % of your FTP; the site lists 22 built-in workouts, including ramp and 20-minute FTP tests, a builder for your own intervals, and 4- to 8-week plans (FTP Builder, Sweet Spot, Base Builder) that queue the next session. After a ride you get normalised power, intensity factor, TSS, time in each power and heart rate zone and a power curve from 1 second to 30 minutes. Rides are saved on the phone and export as TCX files to upload to Strava or elsewhere; the app has no account, no ads and, by its Google Play listing, collects no data. A Bluetooth heart rate strap can connect separately from the trainer. No virtual world, routes or ANT+. Riding is free; ERG workouts, the analytics charts and zone breakdowns need a subscription after a 14-day free trial. Made by ArkSigma Ltd.

Features

  • ERG mode
  • Workouts

Sends rides to

  • Any tracker, by file (FIT, TCX…)

In these lists

Changelog

  1. Version 1.1.35App Store

    • Redesigned interface with one high-contrast look across the app
    • Workout profiles show power zones in colour, and Free Ride has a large power display
    • Fixes for FTMS resistance control, workout saving on fresh installs, and a stuck History tab
    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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More training apps

  • Croissant RideFree open-source browser app for ERG workouts on a Bluetooth FTMS trainer, with 3D worlds and a .FIT file with a lap per step
  • 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