# Bluebird vs KnowDay

The clearest difference is in-app purchases: KnowDay at none against Bluebird's 5. KnowDay also leads on update cadence (every 5 weeks vs every 3 months). Bluebird's advantage is iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Bluebird sells 5 in-app purchases, starting at $9.99 per month. KnowDay asks for nothing beyond the download.

Bluebird ships an update every 3 months, KnowDay every 5 weeks. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Bluebird | KnowDay |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Size | 45 MB | 67 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Pronunciator LLC](https://appshunter.io/developer/520228857) | [Daniel Brouwer](https://appshunter.io/developer/1870224712) |

## What reviewers say

### Bluebird

[App page](https://appshunter.io/ios/app/bluebird-learn-hebrew/id1582767075)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited languages (1 month) | $9.99 | per month |
| Unlimited languages (1 year) | $99.99 | per year |
| RAPID TEST PRODUCT | $19.99 | one-time |
| One Language Lifetime purchase | $99.00 | one-time |
| Lifetime purchase | $199.99 | one-time |


### KnowDay

[App page](https://appshunter.io/ios/app/knowday/id6758007504)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bluebird free?

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

### Is KnowDay free?

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

### Do Bluebird or KnowDay have ads?

Neither Bluebird nor KnowDay shows ads.

### Which is updated more often, Bluebird or KnowDay?

Bluebird ships an update every 3 months, and KnowDay every 5 weeks. Most recently, Bluebird was updated on October 10, 2026 and KnowDay on October 25, 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.*