4iiii vs Notio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
4iiii
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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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)
Notio
This app helps cyclists improve their aerodynamics by measuring drag coefficient and providing performance analysis. It works with dedicated sensor hardware and compatible Garmin devices, allowing for standalone recording and real-time data display. Analyze your performance over time and optimize your riding technique.
- Measure aerodynamic drag coefficient (CdA)
- Benchmark and analyze aero performance
- Track activities and statistics
- Sync with ANT+ bike sensors
- Standalone recording with sensor hardware
- Real-time wind speed and CdA display
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Notio combines sensor hardware and this app to improve your aerodynamics by transforming your drag coefficient into better performance. You do not need to carry your phone when you ride. The Notio can be used to record your ride in standalone mode and is compatible with Connect IQ compatible Garmin devices. The Garmin device can start/stop your Notio and display CdA and wind speed values while you ride. Notio’s app includes the ability to: • Benchmark and analyze your aero performances through time. • Track your activities and their related statistics. • Sync with multiple ANT+ compatible bike sensors. (1) Notio calculates: • CdA (aerodynamic drag coefficient) • Relative altitude • Air density • Wind Speed • Acceleration • Roll • Vibration The Notio app breaks speed down into a science. Helping you turn facts and figures into techniques and technology so that you can find your perfect riding sweet spot. Learn more about Notio app and devices at Notio.ai. (1) See compatible devices at Notio.ai/compatibility
Screenshots
Verdict
The clearest difference is rating: Notio at 2.5 against 4iiii's 1.6. Notio also leads on ads (none vs shown) and monetization model (free vs free with in-app purchases). 4iiii's advantage is ratings volume (92 vs 2) and device support (4 vs 2). On price, update cadence, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Notio holds the better App Store score, 2.5 against 1.6. That said, the two scores are not equally well evidenced: 4iiii has 92 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 11% of 4iiii's written reviews are positive against 33% of Notio's.
4iiii ships an update every 3 months, Notio every 4 months. The most recent releases landed on October 20, 2026 and September 30, 2026 respectively.
| Parameter | 4iiii | Notio |
|---|---|---|
| Price | Free | Free |
| Rating | 1.6 (92 ratings) | 2.5 (2 ratings) — better |
| Positive reviews | 10.9% of reviews | 33.3% of reviews — better |
| Number of ratings | 92 — better | 2 |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 30 MB | 38 MB |
| Age rating | 4+ | 12+ |
| Developer | 4iiii Innovations Inc. | Notio Technologies inc. |
Customer experience
4iiii
Notio
Bugs and requests
4iiii
Reported bugs
21 issues- 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
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- 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)
Requested features
12 requests- Support for multiple power meters on single device
- Spanish language support
- Japanese language support
- Optional notifications instead of mandatory
- Improved bikeindex.org integration
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- 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
Notio
Not enough reviews yet to summarise bugs or requests.
In-app purchases
4iiii
No in-app purchases
Notio
No in-app purchases
