# 4iiii vs Notio

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.

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.

## The numbers

| Metric | 4iiii | Notio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (92 ratings)](https://appshunter.io/ios/app/4iiii/id600704389/reviews) | **[2.5 (2 ratings)](https://appshunter.io/ios/app/notio/id1463217936/reviews)** |
| Number of ratings | **92** | 2 |
| Positive reviews | 10.9% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 30 MB | 38 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [4iiii Innovations Inc.](https://appshunter.io/developer/600704392) | [Notio Technologies inc.](https://appshunter.io/developer/1348398928) |

## What reviewers say

### 4iiii

[App page](https://appshunter.io/ios/app/4iiii/id600704389)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✅ 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

**What reviewers complain about**

- 🐛 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

**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

**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


### Notio

[App page](https://appshunter.io/ios/app/notio/id1463217936)

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.

**Highlights:** 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

**In-app purchases:** none


## Frequently asked questions

### Is 4iiii free?

4iiii is free to download, with no in-app purchases.

### Is Notio free?

Notio is free to download, with no in-app purchases.

### Which has better reviews, 4iiii or Notio?

Notio is rated higher. 4iiii averages 1.6 out of 5 from 92 ratings, while Notio averages 2.5 from 2 ratings.

### Do 4iiii or Notio have ads?

4iiii shows ads; Notio does not.

### Which is updated more often, 4iiii or Notio?

4iiii ships an update every 3 months, and Notio every 4 months. Most recently, 4iiii was updated on October 20, 2026 and Notio on September 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*