Comparison

J55Xデータ管理 vs Sleep Sounds

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

Head to head
About

J55Xデータ管理

Features
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J55xシリーズで測定したデータを管理するアプリです J558では血管年齢にも対応しています 対応機種 J556K、J558 J55xシリーズで出力されたQRコードをアプリから読み込むことで、スマホにデータを取り込むことができます。 J55xシリーズではストレス度、自律神経の活性度、脈拍の状態等を測定し、自律神経の状態を把握することができます。

About

Sleep Sounds

Drift off to sleep with a vast library of calming sounds, including white noise, nature soundscapes, and ambient tones. Create custom mixes, utilize a smart sleep timer, and enjoy background playback for uninterrupted relaxation.

Highlights
  • Real-time synthesized noise generator
  • Extensive library of nature and ambient sounds
  • Customizable sound mix builder
  • Sleep timer with fade-out functionality
  • Background playback
  • Offline sound downloads
  • Apple Watch companion app
Features
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SleepMaker: White Noise & Sleep Sounds Fall asleep faster with white noise, pink noise, brown noise, rain sounds, ocean waves, and a rich library of calming sleep sounds. Whether you need to block distractions, soothe a baby, focus at work, or simply relax before bed, SleepMaker gives you studio-quality audio tuned for deep sleep, stress relief, and natural relaxation. NEW: REAL-TIME NOISE MACHINE White, pink, brown, blue, grey, and violet noise synthesised on-device in real time — not looped recordings, so they never repeat and never fade out mid-sound. Adjust tilt (brighter or darker), stereo width, and volume to dial in exactly the sound that helps you fall asleep. Includes its own sleep timer with fade-out. FULL SOUND LIBRARY • White noise, pink noise, brown noise — procedural, loop-free • Rain sounds, thunder, storms, rainfall on tents • Ocean waves, streams, rivers, waterfalls • Forest ambience, crickets, birds, wind • Fan sounds, hairdryer, vacuum, airplane cabin, air conditioner • Baby-specific: womb, heartbeat, lullabies, swaddle ambient • Focus loops for study, work, meditation, and yoga CUSTOM MIX BUILDER Layer any sounds together and save your personal mix. Combine rain, fan, and distant thunder — or ocean, seagulls, and wind. Mix to your taste and recall it with one tap. SLEEP TIMER WITH FADE-OUT Set the timer and drift off. SleepMaker gently fades the audio to zero over your chosen duration so it never stops abruptly and never wakes you up. FOR EVERY NEED • Insomnia — mask tinnitus, racing thoughts, and noisy neighbours • Babies and toddlers — gentle heartbeat, womb, and lullaby tones • Focus — pink noise and ambient tones for studying, coding, reading • Meditation and yoga — forest, stream, and chime backdrops • Travel — block airplane, train, and hotel noise • ASMR — gentle whispers, crackles, and taps • Anxiety and stress relief — calming spa and nature soundscapes WORKS EVERYWHERE • Apple Watch companion — start, stop, and switch sounds from your wrist • Home-screen widget showing the current mix and playback state • Lock Screen and Dynamic Island Now Playing controls with artwork • Background playback — keep sounds running while you use other apps • Offline — every sound is downloadable for use without Wi-Fi • 40+ app languages supported FREE TO USE, PRO UNLOCKS EVERYTHING Core sounds and the noise generator are free. Pro unlocks the full catalogue, all noise colours, advanced mix features, and the complete timer range. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions auto-renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. Manage or cancel in your Apple ID account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://mobilealchemy.co/privacy-policy.html Support: https://sleepmaker.app

Screenshots

J55Xデータ管理4 screens
Sleep Sounds4 screens

Verdict

The call

The clearest difference is in-app purchases: J55Xデータ管理 at none against Sleep Sounds's 4. J55Xデータ管理 also leads on iOS requirement (13.0 vs 16.6). Sleep Sounds's advantage is update cadence (every 10 days vs every 24 months). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sleep Sounds sells 4 in-app purchases, starting at $1.99 per 7 days. J55Xデータ管理 asks for nothing beyond the download.

UpkeepUpdate frequency

J55Xデータ管理 ships an update every 24 months, Sleep Sounds every 10 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
J55Xデータ管理 versus Sleep Sounds: the parameters behind the verdict, then further details
ParameterJ55Xデータ管理Sleep Sounds
PriceFreeFree
Rating—1.0 (1 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 24 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.6
Further details — not scored
Size10 MB36 MB
Age rating12+4+
DeveloperWORK JOY, CO.,LTD.MOBILE ALCHEMY LTD

In-app purchases

None

J55Xデータ管理

No in-app purchases

4 purchases

Sleep Sounds

Subscriptions4
  • Weekly3 Days trial$1.997 Days
  • Monthly7 Days trial$5.991 Month
  • Yearly7 Days trial$39.991 Year
Show 1 more
  • Yearly with Family Sharing7 Days trial$59.991 Year

Questions

Is J55Xデータ管理 free?
J55Xデータ管理 is free to download, with no in-app purchases.
Is Sleep Sounds free?
Sleep Sounds is free to download, with in-app purchases available.
Do J55Xデータ管理 or Sleep Sounds have ads?
Neither J55Xデータ管理 nor Sleep Sounds shows ads.
Which is updated more often, J55Xデータ管理 or Sleep Sounds?
J55Xデータ管理 ships an update every 24 months, and Sleep Sounds every 10 days. Most recently, J55Xデータ管理 was updated on November 2, 2026 and Sleep Sounds on October 31, 2026.

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