# 4iiii vs Cadra

The clearest difference is in-app purchases: 4iiii at none against Cadra's 2. 4iiii also leads on device support (3 vs 1). Cadra's advantage is update cadence (every 3 weeks vs every 3 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Cadra sells 2 in-app purchases, starting at $9.99 per month. 4iiii asks for nothing beyond the download.

4iiii ships an update every 3 months, Cadra every 3 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 4iiii | Cadra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/4iiii/id600704389/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 10.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 70 MB | 44 MB |
| Requires iOS | 17.6 | **16.2** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [4iiii Innovations Inc.](https://appshunter.io/developer/600704392) | [Ty Edmeades](https://appshunter.io/developer/1884779959) |

## 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, Apple Watch app

**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


### Cadra

[App page](https://appshunter.io/ios/app/cadra/id6760514759)

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cadra Pro Monthly | $9.99 | per month |
| Cadra Pro Annual | $59.99 | per year |


## Frequently asked questions

### Is 4iiii free?

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

### Is Cadra free?

Cadra is free to download, with in-app purchases available.

### Do 4iiii or Cadra have ads?

Neither 4iiii nor Cadra shows ads.

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

4iiii ships an update every 3 months, and Cadra every 3 weeks. Most recently, 4iiii was updated on November 6, 2026 and Cadra on October 31, 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.*