Onoff Numbers vs OpusTel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Onoff Numbers
Get a second phone number instantly through an app, without needing a new SIM card or device. Keep your personal and professional lives separate, protect your privacy, and make international calls at low costs. Manage calls, SMS, and voicemail all in one place.
- Second phone number
- Separate professional and personal lines
- Privacy protection
- Low-cost international calls
- Integrated visual voicemail
- Port existing numbers
- Numbers from 30+ countries
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What if you could get a second number in minutes, without the hassle of using a second phone or a second SIM card, but just by downloading an app? You dreamed of it, Onoff made it happen! You will want to use a second number for: Having a separate professional line - separate your professional and personal life Protecting your privacy when you are online - your safety is our priority Selling goods online in total confidence - safely communicating with your potential buyers Carrying only one phone on you - less weight in your pocket, less hassle between switching the phones Being able to use your phone number from any smartphone and even from your web browser - we want you to have a number as flexible as your email! Make low-cost international calls - the world is just one call away With Onoff, you also have: -Calls and SMS -Integrated visual voicemail -Voice messages -Synchronization of all your contacts list -Possibility of porting an existing number, in order to use it in the Onoff App -An app compatible with all SIM cards to always call on the best network -Numbers from more than 30 countries available And there’s much more ! You can follow us on: Facebook - Linkedin - Twitter - Instagram In the application, you can subscribe to a number or a calling plan, the prices of which vary depending on the nationality or region chosen, as well as the duration (1, 3 or 12 months). Payment will be made through your iTunes account after confirmation of purchase, and will be withdrawn 24 hours before the end of each billing cycle. You can deactivate automatic renewal in the settings of the App Store after purchase, at least 24 hours before the end of the current subscription period. With your Onoff number, you can make unlimited calls throughout Europe. For communication outside of Europe, you can also purchase credits, valid for any destination! Any demonstration product offered within promotions will be automatically terminated upon first purchase. We cannot guarantee the systematic compatibility of numbers with verification services by SMS. Onoff: several numbers in one application, without changing the SIM card! See https://www.onoff.app/en/privacy-policy for the Privacy Policy. Onoff app Terms and Conditions can be found at https://www.onoff.app/en/terms-conditions/
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 ...)
Screenshots
Verdict
The clearest difference is review sentiment: OpusTel at 80% against Onoff Numbers's 43%. OpusTel also leads on in-app purchases (none vs 14) and rating (5.0 vs 4.6). Onoff Numbers's advantage is update cadence (fortnightly vs every 14 months) and ratings volume (788 vs 6). On price, ads, device support 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
Both are free to download. Onoff Numbers sells 10 in-app purchases, starting at $7.99 per month. OpusTel asks for nothing beyond the download.
OpusTel holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Onoff Numbers has 788 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 43% of Onoff Numbers's written reviews are positive against 80% of OpusTel's.
Onoff Numbers ships an update fortnightly, OpusTel every 14 months. The most recent releases landed on September 28, 2026 and August 29, 2026 respectively.
| Parameter | Onoff Numbers | OpusTel |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (788 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 43.4% of reviews | 80.0% of reviews — better |
| Number of ratings | 788 — better | 6 |
| Update frequency | Fortnightly — better | Every 14 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 318 MB | 98 MB |
| Age rating | 4+ | 4+ |
| Developer | ONOFFAPP OU | OpusTel |
Customer experience
Onoff Numbers
OpusTel
Bugs and requests
Onoff Numbers
Reported bugs
4 issues- Calls and texts not going through
- Account validation issues
- Frequent app crashes
- Syncing problems with contacts
Requested features
4 requests- Add more country support
- Improve call and SMS reliability
- Introduce VoIP calling
- Offer better customer support
OpusTel
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Onoff Numbers
- Onoff Premium7 Days trial$7.991 Month
- 1 month$10.991 Month
- 1 month$17.991 Month
Show 1 moreShow fewer
- 1 month$21.491 Month
- 100 credits$1.99
- 1000 credits$9.99
- 1 month$10.99
Show 3 moreShow fewer
- 1 month$12.99
- 3 month$12.99
- 1 month2 variants$17.99
OpusTel
No in-app purchases









