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.
J55Xデータ管理
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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。
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.
- 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
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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
Verdict
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
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.
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.
| Parameter | J55Xデータ管理 | Sleep Sounds |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 24 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 10 MB | 36 MB |
| Age rating | 12+ | 4+ |
| Developer | WORK JOY, CO.,LTD. | MOBILE ALCHEMY LTD |
In-app purchases
J55Xデータ管理
No in-app purchases
Sleep Sounds
- Weekly3 Days trial$1.997 Days
- Monthly7 Days trial$5.991 Month
- Yearly7 Days trial$39.991 Year
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- Yearly with Family Sharing7 Days trial$59.991 Year








