Comparison

Sleep Timer vs Challenges Aid

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

Head to head
About

Sleep Timer

Drift off to sleep or find focus with a variety of calming soundscapes. This app allows you to create custom mixes and enjoy them even when your device is locked or the app is running in the background. Improve your sleep, reduce stress, and enhance meditation sessions.

Highlights
  • Custom sound mixes
  • Background playback
  • Offline playback (device locked)
  • Variety of sound themes
  • Stress and anxiety reduction
Features
Read full description

With Sleep Timer — Relaxing Sounds App you also can: ► Sleep better and feel healthier; ► Prepare for meditation session; ► Relax and concentrate; ► Reduce stress and anxiety; ---- OTHER FEATURES ---- ● App runs in the background; ● Create sound mixes; ● App runs while device locked; Enjoy sound themes ► Forest ► Ocean ► Beach ► Night River ► White Noise ► Space ► Winter ► Dive ► Marine life ► Waterfall ► Mountains Ideal for sleeping, meditation and concentration. Clear your mind, remove the stress.

About

Challenges Aid

This app helps you track and achieve your monthly Apple Watch fitness challenges. It provides insights into your progress, offers reminders, and displays your achievements through a history tab and customizable widgets.

Highlights
  • Monthly challenge progress tracking
  • Historical achievement overview
  • Motivational messages
  • Home and Lock Screen widgets
  • Limited Edition Challenge tracking
  • Customizable reminders
Features
Read full description

Struggling to complete your Apple Watch challenges each month? Let us aid you! With Challenges Aid you will get easier and better insights into your progress this month. You can be reminded on the first day of each month to set your new challenges and with the History tab you will build a great overview of your achievements through the years. Small motivational messages will keep you going and inform you how you are doing. And with both Lock Screen and Homescreen widgets you always have your progress right at hand! Challenges Aid gets your data from Apple Health and only requires read access. The Apple Watch challenges cannot be read from your Health app or the Watch, those must be set manually each month. A reminder will help you do that. ThisMonth Overview * Get a clear view on today's progress * Get an overview of this month's challenge and progress * Get an overview of how much time has passed in the month * See day by day whether or not you achieved that day's goal or reached the required average Limited Edition Challenges* * Track the current, upcoming and previous Limited Edition Challenges * Get a clear view on the current challenges * Look back which challenges you’ve achieved and which you didn’t * More details to come later History* * Add previous challenges and see at a glance which ones you achieved * Open a challenge to see more details Settings * Toggle motivational messages on or off * Choose between distances in kilometers or miles * Toggle the monthly reminder on or off and set a time* * Toggle the monthly summary on or off and let it be auto saved * Subscribe to Limited Edition Notifications to never miss one* With companion Apple Watch App (work in progress). Widgets for your iPhone's Home and Lock Screen and Apple Watch complications! Challenges Aid Plus: * Get access to Limited Edition Challenges * Get your full History instead of the past 12 months * Set reminders and notifications * More widgets (coming soon) * Deeper insights (coming soon) Standard Apple Terms of Use (EULA) applies: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Sleep Timer4 screens
Challenges Aid4 screens

Verdict

The call

The clearest difference is review sentiment: Sleep Timer at 100% against Challenges Aid's 30%. Sleep Timer also leads on rating (4.7 vs 4.1) and in-app purchases (none vs 3). Challenges Aid's advantage is price (Free vs $1.99). On ratings volume, 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

CostPrice · In-app purchases · Ads · Monetization

Challenges Aid is free to download; Sleep Timer costs $1.99 up front. Challenges Aid sells 3 in-app purchases, starting at $0.99 per month. Sleep Timer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sleep Timer holds the better App Store score, 4.7 against 4.1. Both are backed by a comparable volume of ratings — 17 and 7 respectively. Written reviews point the same way: 100% of Sleep Timer's written reviews are positive against 30% of Challenges Aid's.

UpkeepUpdate frequency

Sleep Timer ships an update weekly, Challenges Aid fortnightly. The most recent releases landed on September 14, 2026 and July 9, 2026 respectively.

Scorecard7 real differences · 3 level
Sleep Timer versus Challenges Aid: the parameters behind the verdict, then further details
ParameterSleep TimerChallenges Aid
Price$1.99Free — better
Rating4.7 (17 ratings) — better4.1 (7 ratings)
Positive reviews100.0% of reviews — better30.0% of reviews
Number of ratings17 — better7
Update frequencyWeekly — betterFortnightly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS13.0 — better17.0
Further details — not scored
Size198 MB8 MB
Age rating4+4+
DeveloperIrina TiukalovaTim Hilker

Customer experience

Sleep Timer

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews19 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Challenges Aid

All ratings7 ratings
Positive71.4%
Neutral28.6%
Negative0.0%
Written reviews10 reviews
Positive30.0%
Neutral20.0%
Negative50.0%

In-app purchases

None

Sleep Timer

No in-app purchases

3 purchases

Challenges Aid

Subscriptions2
  • Plus Monthly7 Days trial$0.991 Month
  • Plus Yearly$9.991 Year
One-time1
  • Plus Lifetime$29.99

Questions

Is Sleep Timer free?
Sleep Timer costs $1.99, with no in-app purchases.
Is Challenges Aid free?
Challenges Aid is free to download, with in-app purchases available.
Which has better reviews, Sleep Timer or Challenges Aid?
Sleep Timer is rated higher. Sleep Timer averages 4.7 out of 5 from 17 ratings, while Challenges Aid averages 4.1 from 7 ratings.
Do Sleep Timer or Challenges Aid have ads?
Neither Sleep Timer nor Challenges Aid shows ads.
Which is updated more often, Sleep Timer or Challenges Aid?
Sleep Timer ships an update weekly, and Challenges Aid fortnightly. Most recently, Sleep Timer was updated on September 14, 2026 and Challenges Aid on July 9, 2026.

Other comparisons