SkyLetter vs Glitch Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SkyLetter
Create personalized messages drawn in the sky with airplane contrails. Share your creations as videos or photos on social media, perfect for sending unique greetings or declarations.
- Draw messages in the sky with contrails
- Share creations as video or photo
- Personalize messages for friends
- Unique social media content
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【Deliver your message in the cloud】 "SkyLetter" is an application that draws a message in the sky with contrail. Look up at the sky after entering the message. The airplane which received your message there draws a message with a trail of contrail. Why don't you draw in the sky the names of you, your friends, and the messages you want to convey? You can share it as a video or photo on social media. Let's take a photo that is drawn message and send it to many people. 【Recommended environment】 Support for iOS12.0 or later / iPhone 6S later. If your device is under iOS 12.0, please update and install.
Glitch Clock
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Hamon turns your screen into a calm pool of water. Tap to drop a ripple and watch it spread, interfere with others, and reflect off the edges — a real fluid simulation, not a looping animation. Switch to ink and stir colors together with your finger: indigo, vermilion and viridian blend the way real ink does in water, then slowly sink and fade. WATCH A living water surface you can touch. Leave it be and ripples appear on their own. CLOCK The time floats on the water, gently distorted by every ripple. Choose a calm water surface or flowing ink behind it. CREATE Adjust the flow — distance, waves, ink density, swirl — and save your own patterns. Designed to be quiet. The interface fades away so only the water remains. No accounts. No ads. No tracking. Everything stays on your device.
Screenshots
Verdict
The clearest difference is iOS requirement: SkyLetter at 12.0 against Glitch Clock's 17.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
SkyLetter ships an update fortnightly, Glitch Clock every 10 days. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.
| Parameter | SkyLetter | Glitch Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Fortnightly | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 45 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Kiyotaka Watanabe | Ryoma Yanagimoto |
In-app purchases
SkyLetter
No in-app purchases
Glitch Clock
No in-app purchases
