# iKnow Birds PRO vs Quartet

The clearest difference is in-app purchases: Quartet at none against iKnow Birds PRO's 2. Quartet also leads on update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. iKnow Birds PRO sells 2 in-app purchases, starting at $1.99 per month. Quartet asks for nothing beyond the download.

iKnow Birds PRO ships an update every 2 months, Quartet weekly. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | iKnow Birds PRO | Quartet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (33 ratings)](https://appshunter.io/ios/app/iknow-birds-pro/id947434163/reviews)** | — |
| Number of ratings | **33** | — |
| Positive reviews | 48.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | — |
| Size | 453 MB | 1 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [NATURE MOBILE](https://appshunter.io/developer/964511943) | [KUAN HUANG](https://appshunter.io/developer/6783854163) |

## What reviewers say

### iKnow Birds PRO

[App page](https://appshunter.io/ios/app/iknow-birds-pro/id947434163)

Identify North American birds with a comprehensive field guide. Features detailed species information, professional images, and bird calls. Connect with experts for identification help and track your sightings.

**Highlights:** Comprehensive bird species library, High-quality images and bird calls, Online species consultation with experts, Sighting tracking with GPS and photos, Species training quiz game, Identification by appearance, habitat, and order

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iKnow Birds PRO - Monthly | $1.99 | per month |
| iKnow Birds PRO - Yearly | $5.99 | per year |


### Quartet

[App page](https://appshunter.io/ios/app/quartet/id6786406036)

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

**In-app purchases:** none


## Frequently asked questions

### Is iKnow Birds PRO free?

iKnow Birds PRO is free to download, with in-app purchases available.

### Is Quartet free?

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

### Do iKnow Birds PRO or Quartet have ads?

Neither iKnow Birds PRO nor Quartet shows ads.

### Which is updated more often, iKnow Birds PRO or Quartet?

iKnow Birds PRO ships an update every 2 months, and Quartet weekly. Most recently, iKnow Birds PRO was updated on November 11, 2026 and Quartet on November 5, 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.*