# World Clock... vs LanguageKnow

The clearest difference is in-app purchases: LanguageKnow at none against World Clock...'s 2. LanguageKnow also leads on update cadence (every 2 weeks vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. World Clock... sells 2 in-app purchases, starting at $1.99 per month. LanguageKnow asks for nothing beyond the download.

World Clock... ships an update monthly, LanguageKnow every 2 weeks. The most recent releases landed on October 3, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | World Clock... | LanguageKnow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/languageknow-teach-and-learn/id6778675744/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | — | Ad-supported |
| Size | 121 MB | 6 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Olga Ivanova](https://appshunter.io/developer/1733570435) | [Koms Services LLC](https://appshunter.io/developer/6778675746) |

## What reviewers say

### World Clock...

[App page](https://appshunter.io/ios/app/world-clock/id6751114970)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| timezones_by_oliva_subscription | $1.99 | per month |
| timezones_by_oliva_donation | $1.99 | one-time |


### LanguageKnow

[App page](https://appshunter.io/ios/app/languageknow-teach-and-learn/id6778675744)

Learn or teach any language, from endangered dialects to global languages, with AI tutors and native speakers. Features personalized lessons, speech practice, and tools for educators to share and preserve linguistic heritage.

**Highlights:** AI conversation practice, Personalized lessons & quizzes, Speech and pronunciation practice, Verified dictionary, Tools for language teachers, Preservation of endangered languages, Community language groups

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

**In-app purchases:** none


## Frequently asked questions

### Is World Clock... free?

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

### Is LanguageKnow free?

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

### Do World Clock... or LanguageKnow have ads?

Both World Clock... and LanguageKnow show ads.

### Which is updated more often, World Clock... or LanguageKnow?

World Clock... ships an update monthly, and LanguageKnow every 2 weeks. Most recently, World Clock... was updated on October 3, 2026 and LanguageKnow on September 23, 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.*