Comparison

Sun to Moon Sleep Clock vs TwinClock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sun to Moon Sleep Clock

This app acts as a gentle sleep trainer for young children, visually indicating when it's time to stay in bed and when it's okay to wake up. It offers customizable features like sleep sounds, nap timers, and a reward system to encourage good sleep habits.

Highlights
  • Visual star countdown for bedtime
  • Customizable sleep and wake sounds
  • Nap timers and bedtime routine tools
  • Personalizable characters with outfits
  • Optional Snooze Rewards system
  • Visual shooting-star progress bar
  • PIN-protected settings
Features
Read full description

Sun to Moon Sleep Clock is a gentle sleep trainer that helps toddlers and young children learn when to stay in bed and when it’s okay to get up. Throughout the night, 26 stars disappear one by one, giving kids an easy visual countdown until morning. The app is quick to set up, fully customizable, and packed with optional sleep sounds, wake sounds, nap timers, and bedtime-routine tools. Kids can personalize the friendly Sun and Moon characters with outfits and accessories from their shops. Everything is unlocked from the start, but you can enable the optional Snooze Rewards system to encourage healthy sleep habits. The longer your child stays in bed, the more Snooze Coins they earn — and they can trade them for fun gifts for Sun and Moon. Wake-up times can be set from the settings screen or by tapping the orange time buttons on the main daytime screen. Tapping Goodnight triggers an instant sunset at bedtime. Need an early wake-up for a nap or a schedule change? Tap Moon’s nose three times for an out-of-schedule sunrise — and three more times for an immediate sunrise. Full instructions: https://www.msibley.com/sleep-clock Updates & tips: https://www.facebook.com/suntomoonsleepclock –––––––––––––––––––––––––––– Key Features • Gentle sleep training with a visual star countdown • Soothing sleep sounds: Fan, white noise (hair dryer), waves, heartbeat, whale song, rain and more — or silence • Fun wake-up sounds: Birds, digital alarm, drums, rooster, Happy Birthday, Santa/Jingle Bells and more — or silence • Custom schedules: Optional 7-day routine planner • Digital or analog clock styles, including a large-digit mode • Speaking Clock: Tap Sun or Moon’s mouth to hear the time (optional) • Customizable outfits and accessories for Sun and Moon • Themes: Birthday, Christmas, Easter, Halloween, St Patrick’s Day, Pirates, Sports, Space • Snooze Rewards system using collectible Snooze Coins (optional) • Shooting-star progress bar for nighttime visualization • Final Countdown Mode: Faster 12-star countdown before wake-up (optional) • Reading Time: Moon reads for up to an hour at sunrise or sunset • Nose Tap Naps: Set a nap duration and activate with 3 taps • Immediate Sunrise: Trigger instantly with 3 extra taps • Morning Memo: Write a message for your child — Sun can read it aloud (optional) • Dim & Auto-Dim controls to reduce brightness • Dark Mode for softer nighttime colors • Built-in help screens throughout the app • Multilingual support: English, German, Spanish, French, Italian, Dutch, Portuguese, Simplified Chinese, Japanese and Korean • PIN-protected settings with Face ID / Touch ID support (master code: 8529) • Dreamy illustrations by artist Michael Sibley –––––––––––––––––––––––––––– Helpful Notes • For uninterrupted use, enable Guided Access to disable device buttons • Keep your device plugged in while the app is running overnight • Reduce screen brightness or enable Auto-Dim for extended nighttime use • If you forget your settings PIN, the master code is 8529 –––––––––––––––––––––––––––– If You Find the App Helpful… A rating or review on the App Store really helps us improve Sun to Moon. Thank you for your support — and sweet dreams!

About

TwinClock

This app helps toddlers develop better sleep habits by visually signaling when it's time to wake up. It uses fun animations and a reward system to encourage children to wait for the sun to appear before leaving their beds.

Highlights
  • Customizable wake-up time
  • Optional unlock code
  • Fun graphics and animations
  • Works on various devices
  • No special permissions needed
  • Reward program for children
Features
Read full description

TwinClock is a simple sleep trainer app for your toddler. Just wait for the sun to show up before getting out of the bed! All you set is the wake-up time and an optional unlock code, and then leave it to TwinClock to make it fun for your little one to sleep longer. The funny stars will disappear one by one until the big bright smiley sun comes up. With a reward program based on your child’s ability to wait for the sun before getting out of the bed, you can expect great results after a week and sleep longer in the mornings. Features - Customizable wake up time - Setup your own unlock code, making sure your little one can’t wake up the sun earlier - Funny graphics and animations made for children - Works on all major devices such as tablets and phones, including older ones - No specific permissions required to run Recommendations - Place your device on a shelf for instance, ensuring your toddler cannot easily grab it - Adjust your device’s screen brightness accordingly - Make sure your device is in airplane mode, to avoid any notifications from calls or messages - Mute your device sounds & notifications - Great results with toddlers from 2 years old

Screenshots

Sun to Moon Sleep Clock4 screens
TwinClock4 screens

Verdict

The call

The clearest difference is update cadence: TwinClock at every 5 days against Sun to Moon Sleep Clock's every 2 months. TwinClock also leads on price ($0.99 vs $2.99). On review sentiment, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Sun to Moon Sleep Clock costs $2.99 and TwinClock $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sun to Moon Sleep Clock ships an update every 2 months, TwinClock every 5 days. Both last shipped on October 29, 2026.

Scorecard3 real differences · 7 level
Sun to Moon Sleep Clock versus TwinClock: the parameters behind the verdict, then further details
ParameterSun to Moon Sleep ClockTwinClock
Price$2.99$0.99 — better
Rating4.5 (107 ratings) — better—
Positive reviews94.1% of reviews100.0% of reviews — better
Number of ratings107 — better—
Update frequencyEvery 2 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size52 MB97 MB
Age rating4+4+
DeveloperMichael SibleyOxegena Sarl

Customer experience

Sun to Moon Sleep Clock

All ratings107 ratings
Positive86.9%
Neutral4.7%
Negative8.4%
Written reviews17 reviews
Positive94.1%
Neutral5.9%
Negative0.0%

TwinClock

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sun to Moon Sleep Clock

No in-app purchases

None

TwinClock

No in-app purchases

Questions

Is Sun to Moon Sleep Clock free?
Sun to Moon Sleep Clock costs $2.99, with no in-app purchases.
Is TwinClock free?
TwinClock costs $0.99, with no in-app purchases.
Do Sun to Moon Sleep Clock or TwinClock have ads?
Neither Sun to Moon Sleep Clock nor TwinClock shows ads.
Which is updated more often, Sun to Moon Sleep Clock or TwinClock?
Sun to Moon Sleep Clock ships an update every 2 months, and TwinClock every 5 days. Most recently, Sun to Moon Sleep Clock was updated on October 29, 2026 and TwinClock on October 29, 2026.

Other comparisons