# 4iiii

> Fitness device management and cycling data recording app. (iPhone/iPad app by 4iiii Innovations Inc..)

- Source: https://appshunter.io/ios/app/4iiii/id600704389 (this page in markdown: same URL + `.md`)
- Developer: [4iiii Innovations Inc.](https://appshunter.io/developer/600704392)
- Category: Health & Fitness, Sports
- Price: Free
- Rating: 1.60/5 from 91 App Store ratings · 156 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 30 MB
- Languages: American English
- Released: 2013-02-16
- Data updated: 2026-07-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/4iiii/id600704389/reviews.md

## What is 4iiii?

The 4iiii app is a valuable tool to get the most out of the features of your 4iiii products and achieve your fitness goals. Using the app, you can connect to your 4iiii power meter (PRECISION 3/3+ models) and your Viiiiva heart rate monitor to both configure and update them. You can record workout data to be later uploaded to your favourite training software.

The companion Ride Watch app turns your Apple Watch into a cycling head unit. View power, cadence, heart rate, speed, distance, live while riding. Ride records your workout data to FIT file, and to Apple Fitness for closing your rings. Auto-sync to Strava keeps your activity feed up-to-date on completion of every outdoor or indoor cycling workout.

Features include:

4iiii app
Supported devices: PRECISION and Podiiiium Powermeters, Viiiiva heart rate monitors, Fliiiight Smart Trainer
Record workout data (heart rate, power, cadence, pace, speed, distance, time, laps, calories)
Manage stored files
Access the Finder Feature map

Ride Apple Watch app

4iiii PRECISION Power meters (PRECISION and Podiiiium)
Unlock new features to future-proof your devices
Personalize your device name
Pair and unpair dual powermeters
Perform zero offset
Use the Finder Feature to locate your power meter
Easy over-the-air firmware updates

Viiiiva
Personalize your device name
Pair with ANT+ devices to enable ANT+ to Bluetooth passthrough
Record data of paired devices (powermeter, cadence/ speed sensor, etc.)
Store up to 65hr of workout data
Download stored .fit files from your Viiiiva to the 4iiii app

Fliiiight
Personalize device name
Trainer configuration changes (manual positioning, wheel circumference, firmware update)
Diagnostic tools
Workout modes (resistance training, Erg training)

Note: Available for iOS only (supports only iOS version 15.0 or higher)

## Key features

- Connects to power meters and heart rate monitors
- Records workout data (power, heart rate, cadence, etc.)
- Performs zero offset and firmware updates
- Apple Watch cycling head unit functionality
- Auto-syncs to Strava
- Locates power meters with Finder Feature

## What do users think of 4iiii?

Overall sentiment: negative

**Pros**

- ✅ Firmware updates work smoothly when functioning
- 🔋 Battery status display
- ⚙️ Zero offset calibration functionality
- 🎯 Successfully pairs with power meters (when working)
- 📱 Simple and straightforward UI for basic functions
- 🔗 Effective ANT+ to Bluetooth bridging (when operational)

**Cons**

- 🐛 Cannot detect multiple power meters simultaneously
- 🐛 Frequent connection failures and disconnections
- 🐛 App crashes and freezes regularly
- 🐛 Data fields clear themselves unexpectedly
- 🐛 Firmware updates fail mid-process
- 🐛 Dual-sided power meter recognition issues
- 🐛 Login and account creation problems
- 🐛 Incompatibility with iOS updates
- 🐛 Bluetooth connectivity unreliable
- 🐛 Poor bikeindex.org integration
- 😤 Mandatory account creation requirement
- 📍 Forced location tracking and data collection
- 🔐 Privacy concerns with excessive data harvesting
- ⚠️ Outdated and unintuitive UI design
- ❌ Inconsistent app behavior across devices
- 🚫 Bricked power meters after failed updates
- 📞 Non-responsive customer support
- 🌍 Limited language support (no Spanish, Japanese, etc.)

**Commonly reported bugs**

- Cannot pair multiple power meters - only recognizes one at a time
- App fails to detect power meters that other apps find easily (Garmin, Wahoo)
- Dual-sided power meter only shows one side (usually left)
- Firmware update failures brick power meters permanently
- Login credentials not accepted despite being correct
- Password reset emails never arrive
- App crashes on startup and during use
- Data fields randomly clear after being filled
- Bluetooth connection drops unexpectedly during rides
- Ride recording stops without notification
- FIT files become corrupted
- Battery percentage displays incorrectly (shows 49% constantly, 0% when charged)
- Zero offset calibration fails with error messages
- App unresponsive on device settings screen
- Update notifications loop continuously
- Registration screen doesn't scale properly on smaller screens
- App won't open after updates
- Incompatible with iOS 13, iOS 16
- Workout data incomplete or not recorded
- App keeps running in background draining battery
- Offset detection inconsistent (sometimes left, sometimes right)

**Most requested features**

- Support for multiple power meters on single device
- Spanish language support
- Japanese language support
- Optional notifications instead of mandatory
- Improved bikeindex.org integration
- Better UI/UX design modernization
- Offset number display for calibration verification
- ANT+ sensor support for non-4iiii devices
- Workout recording and history features
- Strava integration
- Optional account creation (local-only functionality)
- Improved error messages and feedback

## Recent user reviews (10 of 156)

All indexed reviews: https://appshunter.io/ios/app/4iiii/id600704389/reviews.md

### 1/5 — Hit and miss, usually miss

*2026-03-31, version 3.5.0*

So, I have 2 4iii power meters on 2 bikes. The app seems only to be able to recognise one at a time even though my Garmin can find them both. This has led me on quite a wild goose chase believing the meters were faulty. Really poor.

### 5/5 — Funktioniert

*2026-02-26, version 3.5.0*

Nutze einen Powermeter und bin zufrieden. Alles funktioniert. Kalibrieren, Batteriestatus, Update. Alles gut

### 2/5 — Aggravatingly buggy

*2026-02-16, version 3.4.1*

Fields keep clearing themselves after filling them out and the bikeindex.org integration doesn’t support adding a power meter to an existing bike.

### 1/5 — Could not connect

*2026-01-14, version 3.4.1*

For the first time the app could connect my powermeter. But later my device connection became inactive. I tried removing old connection and pair it from the scratch but the app cannot find my powermeter

### 1/5 — Schlecht.

*2025-11-01, version 3.4.1*

Hab an meinem Cube Nuroad C:62 Race werksmässig den einseitigen 4iiii Precision 3+ Powermeter.
Dieser zeigt leider in der App nur ganz komische Daten. Zum Beispiel wird die Geschwindigkeit oft falsch angezeigt. 
Ich würde den Hersteller hiermit bitten dieses Problem zu lösen.

### 1/5 — Müll

*2025-10-17, version 3.4.1*

Diese App ist der größte Müll.
Schon bei der Anmeldung löscht es dir Daten aus den Feldern und erkennt den/die Powermeter nicht automatisch.

### 1/5 — Non serve a niente 😂😂😂

*2025-08-02, version 3.4.1*

Un disastro totale ….non si collega mai…e non capisco perché non intervenite a spiegare a chi li vendendo come funziona..ripeto un vero disastro..

### 1/5 — Will not connect

*2025-06-11, version 3.4.1*

HRM links to Zwift and other apps. But will not link to this.  In fact the screenshot of this app are different to what is available and what is described in the HRM manual.

### 1/5 — Can’t find power meters that Garmin finds instantly

*2025-03-09, version 3.4.1*

This is on multiple power meters

### 1/5 — wahoo can find powermeter this app cant

*2025-03-07, version 3.4.1*

wahoo can find powermeter this app cant

## Frequently asked questions about 4iiii

### What does the 4iiii app do?

The 4iiii app allows you to connect to and manage your 4iiii power meters (PRECISION 3/3+ models) and Viiiiva heart rate monitors. You can configure, update firmware, and record workout data for later analysis or upload to your favorite training software.

### What are the key features of the 4iiii app?

Key features include connecting to supported devices like PRECISION and Podiiiium Powermeters, Viiiiva heart rate monitors, and Fliiiight Smart Trainer. It records comprehensive workout data, allows file management, and offers a Finder Feature to locate your power meter.

### Is the 4iiii app free to use?

The application is free to download and use. However, it does have in-app purchases, suggesting some advanced features or device unlocks might require payment.

### What devices are compatible with the 4iiii app?

The app supports 4iiii PRECISION and Podiiiium Powermeters, Viiiiva heart rate monitors, and Fliiiight Smart Trainer. The Ride Watch app specifically turns your Apple Watch into a cycling head unit.

### Can I use the 4iiii app for outdoor cycling?

Yes, the companion Ride Watch app functions as a cycling head unit, displaying real-time data like power, cadence, heart rate, speed, and distance while you ride. It records workout data and can auto-sync to Strava.

## Version history (last 5 releases)

### 3.5.0 — 2026-02-24

Support for the new Viiiiva 2 heart rate monitor was added.

### 3.4.1 — 2025-01-06

- fix for bug preventing route records from being added to Apple Fitness workouts

### 3.4.0 — 2024-11-18

Updated look showcasing 4iiii's new branding.

### 3.3.0 — 2024-10-17

Update for iOS 18 and watchOS 11 
- support for Varia rearview radar
- bugfixes

### 3.2.1 — 2024-07-25

Fixes for issues experienced when running on iPad.

## Apps similar to 4iiii

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [OPTIfit.](https://appshunter.io/ios/app/optifit/id1582456380) | — | Free | Health & Fitness |
| [Garmin Connect™](https://appshunter.io/ios/app/garmin-connect/id583446403) | 4.4 (57,411) | Free | Health & Fitness |
| [Monadnock Gymnastics Center](https://appshunter.io/ios/app/monadnock-gymnastics-center/id1583625180) | 5.0 (3) | Free | Health & Fitness |
| [Académie KINESPORT](https://appshunter.io/ios/app/academie-kinesport/id1585633120) | — | Free | Health & Fitness |
| [SwimUp: Swimming Workouts App](https://appshunter.io/ios/app/swimup-swimming-workouts-app/id1477061412) | 4.7 (135) | Free | Health & Fitness |
| [My Coach app](https://appshunter.io/ios/app/my-coach-app/id1582359740) | — | Free | Health & Fitness |

## More apps by 4iiii Innovations Inc.

- [Obvious Discover](https://appshunter.io/ios/app/obvious-discover/id1444256027)

All apps by 4iiii Innovations Inc.: https://appshunter.io/developer/600704392

## Related topics

[4iiii](https://appshunter.io/ios/topics/4iiii) · [4iiii power meter](https://appshunter.io/ios/topics/4iiii-power-meter)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*