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4iiii

4iiii

by 4iiii Innovations Inc.

91 ratings
156 reviews
With Ads
💪 Health & Fitness
⚽ Sports
Free
With Ads

Details

  • Released
  • Updated
  • February 16, 2013
  • February 24, 2026

Features

Developer

4iiii Innovations Inc.
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About

Connect and configure your 4iiii power meters and heart rate monitors. Record workout data, update device firmware, and even turn your Apple Watch into a cycling head unit. Track power, cadence, heart rate, and more while riding.

✓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
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What users say

Summarized from real user reviews of 4iiii. Based on 91 reviews and a 1.6/5 average, it highlights the 6 positives and 18 negatives reviewers mention most about this Health & Fitness app.

Positive things

  • ✅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)

Negative things

  • 🐛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  • ⚠️Outdated and unintuitive UI design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.)
See all reviews

What's New in 4iiii

3.5.0

February 24, 2026

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

User reviews

Most RecentHighest RatedLowest Rated

Hit and miss, usually miss

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.
Mark2rallyMark2rally

Funktioniert

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

Aggravatingly buggy

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

Could not connect

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
Rusoriz13Rusoriz13

Schlecht.

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.
Don_NinoDon_Nino
See 151 more reviews

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User experience

🐞

Reported Bugs

21 issues

Cannot pair multiple power meters - only recognizes one at a time

Bug

App fails to detect power meters that other apps find easily (Garmin, Wahoo)

Bug

Dual-sided power meter only shows one side (usually left)

Bug

Firmware update failures brick power meters permanently

Bug

Login credentials not accepted despite being correct

Bug

Password reset emails never arrive

Bug

App crashes on startup and during use

Bug

Data fields randomly clear after being filled

Bug

Bluetooth connection drops unexpectedly during rides

Bug

Ride recording stops without notification

Bug

FIT files become corrupted

Bug

Battery percentage displays incorrectly (shows 49% constantly, 0% when charged)

Bug

Zero offset calibration fails with error messages

Bug

App unresponsive on device settings screen

Bug

Update notifications loop continuously

Bug

Registration screen doesn't scale properly on smaller screens

Bug

App won't open after updates

Bug

Incompatible with iOS 13, iOS 16

Bug

Workout data incomplete or not recorded

Bug

App keeps running in background draining battery

Bug

Offset detection inconsistent (sometimes left, sometimes right)

Bug
✨

Requested Features

12 requests

Support for multiple power meters on single device

Feature

Spanish language support

Feature

Japanese language support

Feature

Optional notifications instead of mandatory

Feature

Improved bikeindex.org integration

Feature

Better UI/UX design modernization

Feature

Offset number display for calibration verification

Feature

ANT+ sensor support for non-4iiii devices

Feature

Workout recording and history features

Feature

Strava integration

Feature

Optional account creation (local-only functionality)

Feature

Improved error messages and feedback

Feature

FAQ

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.