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justzone2

justzone2

Zone 2 Training Made Simple

1 ratings
2 reviews
💪 Health & Fitness
$1.99

Details

Released
September 23, 2026
Updated
October 21, 2026

Features

Developer

GEORGE GAIMES WHICHELOE
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About

This app automatically adjusts your smart trainer's resistance to keep your heart rate within a specific zone during indoor cycling. It offers adaptive targeting, optional interval training, and seamless integration with your fitness gear and data platforms.

✓Adaptive Zone 2 heart rate targeting
✓Automatic cardiac drift adjustment
✓Optional interval training builder
✓Works with FTMS Bluetooth smart trainers
✓Heart rate monitoring from various devices
✓One-tap upload to Strava and Apple Health
✓Live Activity for Lock Screen stats
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What's New in justzone2

1.0.5

October 21, 2026

• Calories: rides now save calories to Apple Health, calculated from your trainer's measured power, so they show in the Fitness app and count towards your Move ring. • Strava is optional, and the app now works fully without it: History charts the rides you record in the app, and the ride image saves to Photos at the end of each ride. • Brief heart-rate sensor dropouts (a reading far below your real heart rate) are filtered out, so they no longer upset the live display, Zone Targeting or your saved ride. • History: bubble size now shows how long each ride was. • A new look for the saved ride image. • Fixed: a "Recover Workout?" banner could appear after a ride that had finished normally. • Clearer messages if connecting to Strava doesn't work.

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User reviews

Most RecentHighest RatedLowest Rated

Einfach, unkompliziert und funktioniert super!

Die App macht genau das, was sie verspricht. Ich habe meinen Zwift Hub und meine Apple Watch (ebenfalls mit der App) verbunden, und alles hat super funktioniert, sogar im Hintergrund.

Der große Pluspunkt ist das unkomplizierte Setup: Alles lässt sich direkt über das iPhone steuern. Kein zusätzlicher Bildschirm, Laptop oder Tisch neben dem Rollentrainer nötig.
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FFloglin

Response from developer

Thanks for the feedback Floglin - glad you're enjoying the the app. Let me know if there's anything you'd like to to see in the app via https://www.justzone2.com

Confused

Not sure why there is a 60w adjustment zone at all.
MMattweig

Response from developer

Hi Mattweig - thanks for your question. The 60w adjustment zone is really there as a safety catch so that the power doesn't get too far from your preferred anchor that you set at the beginning. Would be very happy to discuss further if you get in touch via https://www.justzone2.com - there's a contact button at the bottom. If the 60w zone is too tight I can definitely add an option to remove it. Thanks again, George.

FAQ

What is justzone2?

justzone2 is an indoor cycling app that automatically adjusts your smart trainer's resistance to keep your heart rate within Zone 2. It focuses on maintaining your target effort without manual adjustments.

How does justzone2 keep my heart rate in Zone 2?

The app uses a PID controller to continuously adjust your trainer's resistance in real-time, matching your heart rate to your desired Zone 2 target. It automatically compensates for cardiac drift.

Can justzone2 be used for interval training?

Yes, justzone2 includes an optional Interval Builder. You can set the number of intervals, their duration, and power targets, as well as recovery power, for structured hard workouts.

What devices does justzone2 work with?

justzone2 is compatible with any smart trainer supporting the FTMS Bluetooth standard. It can read heart rate from Apple Watch, Bluetooth chest straps, optical arm bands, and AirPods Pro 3.

Does justzone2 have ads?

No, justzone2 is ad-free. The app is designed to get out of the way and does not feature any advertisements or upsells.

How much does justzone2 cost?

justzone2 is a paid app, available for a one-time purchase of $1.99. There are no subscriptions or in-app purchases required after the initial buy.

Can I upload my workouts from justzone2?

Yes, justzone2 offers one-tap uploads to Strava, including data like power, heart rate, cadence, distance, and calories. It also saves workouts to Apple Health.

What are the requirements for justzone2?

To use justzone2, you need a smart trainer that supports the FTMS Bluetooth standard and a heart rate monitor. The app is available on iPhone, iPad, and Apple Watch.