PlayWithClock vs Knowtopia
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PlayWithClock
An interactive clock application designed to help users learn to tell time. It allows manipulation of clock hands, provides spoken time in English and Japanese, and offers time-telling challenges. Users can even record their own voices for spoken time.
- Manipulate clock hands
- Listen to spoken time (English/Japanese)
- Time-telling challenges
- Record custom voice for time
- Switch between English and Japanese
- Customizable clock parts and colors
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An analog clock app to rotate the hands and see and hear the time. Try clock questions, record your voice to speak the time, switch Japanese and English display and audio, repeat the time at intervals, check X minutes before or after, and customize clock parts and colors. Reading analog clocks can help develop math skills. Enjoy it in your free time. Thank you for more than 1 million downloads (iOS only)!
Knowtopia
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Make English learning fun and effective with Knowtopia! This app is designed to be used in conjunction with the Knowtopia workbooks and storybooks, creating a complete learning system that combines reading, writing, listening, and speaking practice. Created by an educator with over 25 years of Eikaiwa (English conversation) experience in Japan, Knowtopia builds confidence through interactive activities, structured lessons, and engaging practice that goes beyond memorization. Features: - Interactive activities for natural conversation practice - Designed to work together with Knowtopia workbooks and storybooks - Fun lessons and exercises that reinforce vocabulary and grammar - Developed by an experienced English teacher in Japan - Encourages thinking, not just memorizing Whether at home or in the classroom, Knowtopia provides a full system for English learning that makes study both fun and meaningful.
Screenshots
Verdict
The clearest difference is in-app purchases: PlayWithClock at none against Knowtopia's 1. PlayWithClock also leads on update cadence (every 6 weeks vs every 3 months). Knowtopia's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Knowtopia sells 1 one-off in-app purchase. PlayWithClock asks for nothing beyond the download.
PlayWithClock ships an update every 6 weeks, Knowtopia every 3 months. The most recent releases landed on October 4, 2026 and September 20, 2026 respectively.
| Parameter | PlayWithClock | Knowtopia |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (16 ratings) — better | — |
| Positive reviews | 81.8% of reviews | — |
| Number of ratings | 16 — better | — |
| Update frequency | Every 6 weeks — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 127 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | Akiyo Imanaka | Chad Alexander Knowlton |
In-app purchases
PlayWithClock
No in-app purchases
Knowtopia
- Knowtopia Full-Access$0.49
Questions
Is PlayWithClock free?
Is Knowtopia free?
Do PlayWithClock or Knowtopia have ads?
Which is updated more often, PlayWithClock or Knowtopia?
Other comparisons
