# iodyne vs Circle ID

The clearest difference is ratings volume: iodyne at 5 against Circle ID's 1. Circle ID's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for iodyne against 5.0 for Circle ID. That said, the two scores are not equally well evidenced: iodyne has 5 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | iodyne | Circle ID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/iodyne/id6740823814/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/circle-id/id6786508839/reviews) |
| Number of ratings | **5** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | Free |
| Size | 50 MB | 69 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [iodyne, LLC](https://appshunter.io/developer/1791786091) | [Circle Systems](https://appshunter.io/developer/1584198871) |

## What reviewers say

### iodyne

[App page](https://appshunter.io/ios/app/iodyne/id6740823814)

Manage and monitor your storage devices with this utility app. Unlock iodyne drives using passkeys and scan NFC tags for other devices. Track file transfers and view workflow metadata in real-time.

**Highlights:** Unlock iodyne drives with passkeys, Scan NFC tags for non-iodyne drives, View device provisioning metadata, Monitor file transfers in real-time, Manage workflow metadata

**In-app purchases:** none


### Circle ID

[App page](https://appshunter.io/ios/app/circle-id/id6786508839)

This app replaces traditional passwords with secure, passwordless sign-in using passkeys. It offers one-tap credential filling and protects your information with biometric security, making logins faster and more secure.

**Highlights:** Passwordless sign-in with passkeys, One-tap AutoFill for credentials, Face ID biometric protection, Quick QR code setup, Strong on-device encryption, Cross-device login approval

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iodyne free?

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

### Is Circle ID free?

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

### Which has better reviews, iodyne or Circle ID?

iodyne and Circle ID are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do iodyne or Circle ID have ads?

Neither iodyne nor Circle ID shows ads.

### Which is updated more often, iodyne or Circle ID?

iodyne ships an update every 3 weeks, and Circle ID every 3 weeks. Most recently, iodyne was updated on October 28, 2026 and Circle ID on October 24, 2026.

---

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