Comparison

Interval Clock vs Relax SoundMachine

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

Head to head
About

Interval Clock

This app provides a customizable countdown timer for interval training. It alerts users to speed up or slow down, making it suitable for various exercise equipment or audio-only workouts. Users can set their own interval lengths and timers, with the app remembering the last configuration.

Highlights
  • Customizable interval lengths
  • Countdown timer with alerts
  • Supports audio-only workouts
  • Remembers last interval settings
  • Ideal for stationary bikes and treadmills
Read full description

Interval Clock guides you through interval training with a countdown timer that alerts you when you have to go faster or slower. This is ideal for use on a stationary bike, treadmill, or other piece of exercise equipment that allows you to look at your phone (although you can use the app for just its audio alerts without machinery if you prefer). The app was originally designed for a 20 minute workout with short intervals, as this was found to be an ideal way to train (see this Lifehacker post for details: http://lifehacker.com/5989669). Now the app supports interval lengths and timers of your choosing. It will also remember the last interval you chose so you don't have to change it. If you have any issues or want to report bugs, please let me know and I'll do my best to fix them.

About

Relax SoundMachine

This app offers a wide range of ambient sounds and guided meditations to improve sleep, reduce stress, and boost focus. Create custom soundscapes by mixing multiple audio tracks and utilize features like bedtime reminders and motivational quotes to enhance your daily well-being.

Highlights
  • Massive library of ambient sounds
  • Custom soundscape mixer
  • Bedtime reminders
  • Motivational quotes and affirmations
  • Nature sounds, white noise, and ASMR
  • Calms children and pets
Features
Read full description

Take your first step towards a better, happier life with Sensity. This app is more than just relaxing sounds—it’s a gateway to unlocking your full potential. Whether you're looking to sleep better, calm your mind, boost focus, or simply feel inspired, this sound machine app offers tailored soundscapes and features to meet your every need. Your Journey to a Better You Starts Here! With ambient noise app, sound becomes a tool for transformation. From soothing melodies that lull you into restful sleep to energizing tones that inspire creativity, our extensive collection of soundscapes has been designed with care to help you live your best life. What Can Sensity Do for You? - Transform Sleep into a Blissful Escape. Struggle with falling asleep, staying asleep, or waking up refreshed? Let noise maker app guide you. With soundscapes that mimic nature, white noises, and calming frequencies, you can drift into restorative sleep effortlessly. - Enhance Focus and Productivity. Need to concentrate in a noisy environment or dive into deep work? Use Sensity’s curated soundscapes to eliminate distractions and elevate your focus. - Soothe Your Soul and Reduce Stress. Feeling overwhelmed or anxious? Explore melodies designed to calm your nerves and center your mind, helping you relax and recharge anytime, anywhere. - Calm Children and Pets. Help little ones drift into dreamland with lullabies or relax a stressed pet with soothing ambient sounds. Key Features: - Massive Library of Sounds. Dive into categories like white noise sound, fan noise, sleep sounds, soft music, nature sounds, rain noise, thunderstorm sounds, ASMR, and more. Each category is carefully curated to match your mood and goal, offering a unique audio experience every time. - Sound Mixer. Create your perfect soundscape! Combine up to three HD-quality sounds in an ambient mixer to craft the ambiance you need—whether it’s a peaceful forest, a lively city, or your favorite blend of ocean waves and birdsong, the sound generator has you covered. - Bedtime Reminder. Build healthy sleep habits with bedtime notifications. Our sleep sounds app will gently remind you when it’s time to wind down, making better sleep a natural part of your routine. - Motivational Morning Boost. Begin each day with uplifting quotes and life-changing affirmations. Let inspiration fuel your journey toward greatness in the best sound machine app. Why Choose Sensity? - Improved Sleep Quality. Better sleep means better days. With white noise app, you’ll wake up feeling energized, focused, and ready to connect more deeply with loved ones. - Support for Every Lifestyle. Whether you're a busy professional, a parent, or simply someone seeking peace, the best white noise app has something for you. - Perfect for Pets Too! Calm anxious pets with sounds specifically designed to ease their stress. - Focus on Versatility. Play soothing sounds for relaxation, meditation, work, or play—whatever your needs, the app adapts to your lifestyle. Who Needs Sensity? - Those seeking better sleep or relief from insomnia. - Parents helping their children fall asleep peacefully using white noise for baby. - Pet owners soothing stressed animals with ambient sound. - Anyone in need of a moment of calm in a hectic world. With a background noise app, the possibilities are endless. Unlock the power of sound and discover how it can transform your sleep, focus, and overall well-being. Privacy Policy & Terms of Use At Sensity, your privacy and security are a top priority. Please review our Privacy Policy and Terms of Use for more details about how we protect your data and ensure a safe experience. Note that some features require an in-app purchase/subscription. Functional link to the Terms of Use - https://sensityapp.com/terms-of-use/. Functional link to the Privacy policy - https://sensityapp.com/privacy-policy/.

Screenshots

Interval Clock3 screens
Relax SoundMachine4 screens

Verdict

The call

The clearest difference is rating: Relax SoundMachine at 4.7 against Interval Clock's 3.3. Relax SoundMachine also leads on review sentiment (50% vs 25%) and ratings volume (233 vs 4). Interval Clock's advantage is in-app purchases (none vs 15) and iOS requirement (5.1.1 vs 15.0). On price 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

Both are free to download. Relax SoundMachine sells 14 in-app purchases, starting at $4.99 per 7 days. Interval Clock asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Relax SoundMachine holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Relax SoundMachine has 233 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 25% of Interval Clock's written reviews are positive against 50% of Relax SoundMachine's.

Scorecard7 real differences · 3 level
Interval Clock versus Relax SoundMachine: the parameters behind the verdict, then further details
ParameterInterval ClockRelax SoundMachine
PriceFreeFree
Rating3.3 (4 ratings)4.7 (233 ratings) — better
Positive reviews25.0% of reviews50.0% of reviews — better
Number of ratings4233 — better
Update frequency—Every 2 weeks
Ads—No
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Devices—iPhone, iPod — better
Requires iOS5.1.1 — better15.0
Further details — not scored
Size17 MB203 MB
Age rating4+4+
DeveloperAdam DachisINSP MOBILE LIMITED

Customer experience

Interval Clock

Written reviews4 reviews
Positive25.0%
Neutral50.0%
Negative25.0%

Relax SoundMachine

All ratings234 ratings
Positive91.5%
Neutral3.8%
Negative4.7%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Interval Clock

No in-app purchases

14 purchases

Relax SoundMachine

Subscriptions11
  • Sleep Sounds – 1 Week Access$4.997 Days
  • Sleep Sounds - 1 Week + trial3 Days trial$4.997 Days
  • Sleep Sounds - 1 Week Access$7.997 Days
Show 8 more
  • Sleep Sounds – Monthly Access3 Days trial$9.991 Month
  • Sleep Sounds – Monthly Access$9.991 Month
  • Sleep Sounds – 3 Months Access$19.993 Months
  • Get Sleepy: 1 Year Membership7 Days trial$49.991 Year
  • Sleep Sounds - 1 Year + trial7 Days trial$59.991 Year
  • Sleep Sounds - 1 Year Access1 Year trial2 variants$59.991 Year
  • Sleep Sounds - 1 Year Access$59.991 Year
  • Sleep Sounds - 1 Year + trial7 Days trial$89.991 Year
One-time3
  • Get Sleep: Lifetime Membership$39.99
  • Get Sleep: Lifetime Membership$49.99
  • Get Sleep: Lifetime Membership$59.99

Questions

Is Interval Clock free?
Interval Clock is free to download, with no in-app purchases.
Is Relax SoundMachine free?
Relax SoundMachine is free to download, with in-app purchases available.
Which has better reviews, Interval Clock or Relax SoundMachine?
Relax SoundMachine is rated higher. Interval Clock averages 3.3 out of 5 from 4 ratings, while Relax SoundMachine averages 4.7 from 233 ratings.

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