107.9 COOL vs Krun
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
107.9 COOL
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If you’re a child of the 70s, 80s, or 90s you’ve found a HOME! We play the greatest hits from all of those decade! “Your Morning with Joe & Julianne” will put a smile on your face, and they’ll become your instant friends, as will all of our other fun DJ’s, like Jeremy and Dionna. Plus, we give you lots of chances everyday to win AWESOME stuff with “Cognition Query”, “The Birthday/Anniversary Bash”, and “The Trivia Café”! Don’t miss “The Drive @ 5”, three upbeat feel-good tunes in a row, all relating to the same theme! Now taking us with you wherever you go is easier than ever! So, grab your favorite beverage and let’s hop in the time machine and travel back to when music was the COOLEST…on 107-9 Cool FM!
Krun
Engage with a digital pinwheel that creates captivating optical illusions as it spins and slows. Customize shapes, colors, and speed for a unique visual experience. It's a simple yet mesmerizing tool for all ages.
- Swipe-to-spin pinwheels
- Illusions appear as rotation slows
- Shape, color, and speed customization
- Unlock all content
- Remove ads
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Spin a pinwheel and watch hidden shapes appear while it's moving. Swipe to spin, then enjoy optical illusions as the speed changes. Simple and intuitive for kids and adults. • Swipe-to-spin pinwheels • Illusions that appear as rotation slows • Shape, color, and speed customization • Premium: unlock all and remove ads
Screenshots
Verdict
The clearest difference is in-app purchases: 107.9 COOL at none against Krun's 1. Krun's advantage is update cadence (every 3 days vs every 32 months) and iOS requirement (16.6 vs 18.2). On price, ads and device support 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. Krun sells 1 one-off in-app purchase. 107.9 COOL asks for nothing beyond the download.
107.9 COOL ships an update every 32 months, Krun every 3 days. Both last shipped on October 24, 2026.
| Parameter | 107.9 COOL | Krun |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 32 months | Every 3 days — better |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 18.2 | 16.6 — better |
| Further details — not scored | ||
| Size | 13 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Burt Broadcasting Inc. | Shinichiro Eto |
In-app purchases
107.9 COOL
No in-app purchases
Krun
- Premium Unlock$2.99
