OpusTel vs Sleep Baby ©
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpusTel
This app provides a real Swiss international telephone number for secure VoIP calls on iOS devices. It offers HD audio quality, free global calls between users, and call recording capabilities, all with a focus on user privacy.
- Real Swiss international telephone number
- Secure VoIP calls
- HD high-definition audio quality
- Free global calls between users
- Call recording
- Conference calls
- Automatic language selection
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OpusTel OpusTel is the mobile phone App for iPhone, iPod and iPad, permitting one to use a real Swiss international telephone number, e.g. 0041 41 520 60 00. It allows one to make and to receive secure VoIP calls from any iOS device using 5G/4G/3G/UMTS or Wi-Fi Internet connectivity. It was developed with the focus on privacy. Features: 1. Secure incoming and outgoing calls 2. Incomming calls are free of charge (no roamingcosts) 2. HD high-definition audio quality with the G722 and Opus codec 3. Free global calls from OpusTel to OpusTel 4. Easy transfer calls to any telephone number 5. Ability to record incoming and outgoing calls 6. Conference calls 7. Automatic language selection based on handy language (15 languages like EN, DE, CN, FR, ES, IT ...)
Sleep Baby ©
This app provides a variety of white noise sounds scientifically proven to help babies sleep, reduce stress, and cry less. It also allows users to record custom audio and offers playback in the background with special effects.
- White noise sounds for baby sleep
- Record custom audio
- Background playback
- Shuffle mode
- Video repetition
- Special effects (snow, rain, confetti)
- AirPlay & Chromecast support
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Can not you sleep your baby? With this app you will have it easy. It is proven that white sounds help babies to sleep. NEW: record your own audios for your baby. Choose the sound that best suits your baby and he will fall asleep. - White noise reduces stress in babies - White noise helps babies sleep - White noise helps babies cry less - White noise will help you sleep better Hair dryer, car, carillon, many sounds to choose from. Key Features: - Valid for iPhone, iPad or Apple TV - Shuffle mode (suffle mode) - Possibility to repeat the video indefinitely - Possibility of reproduction in the background - Possibility of applying 5 effects to your favorite contents (snow, powder snow, rain, sparks and confetti) - AirPlay & Chromecast Download this application now and you and your baby can rest. Privacy Policy: http://jewelsapps.com/privacy-policy/ Terms of Use (EULA): http://jewelsapps.com/terms-of-use/
Screenshots
Verdict
The clearest difference is review sentiment: OpusTel at 80% against Sleep Baby ©'s 13%. OpusTel also leads on price (Free vs $0.99) and in-app purchases (none vs 2). Sleep Baby ©'s advantage is update cadence (every 4 months vs every 14 months) and device support (4 vs 1). On ads and iOS requirement 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
OpusTel is free to download; Sleep Baby © costs $0.99 up front. Sleep Baby © sells 2 in-app purchases, starting at $0.99 per month. OpusTel asks for nothing beyond the download.
OpusTel ships an update every 14 months, Sleep Baby © every 4 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | OpusTel | Sleep Baby © |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (7 ratings) — better | — |
| Positive reviews | 80.0% of reviews — better | 12.5% of reviews |
| Number of ratings | 7 — better | — |
| Update frequency | Every 14 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod, Apple TV — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 98 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | OpusTel | Jewelsapps S. L. |
Customer experience
OpusTel
Sleep Baby ©
In-app purchases
OpusTel
No in-app purchases
Sleep Baby ©
- Sleep Baby Full Version$0.991 Month
- Sleep Baby Full version$9.991 Year









