Comparison

Onoff Numbers vs OpusTel

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

Head to head
About

Onoff Numbers

Get a second phone number instantly without needing a physical SIM card or extra device. Manage professional and personal lines separately, protect your online privacy, and make international calls at low costs. Enjoy features like calls, SMS, visual voicemail, and contact synchronization.

Highlights
  • Multiple virtual phone numbers
  • Separate professional/personal lines
  • Enhanced online privacy
  • Low-cost international calls
  • Integrated visual voicemail
  • SMS and voice messaging
  • Contact list synchronization
Features
Read full description

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 Payment will be made through your iTunes account after confirmation of purchase, and will be withdrawn 24 hours before the end of each billing cycle.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/

About

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.

Highlights
  • 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
Read full description

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

Onoff Numbers4 screens
OpusTel4 screens

Verdict

The call

The clearest difference is review sentiment: OpusTel at 80% against Onoff Numbers's 44%. OpusTel also leads on in-app purchases (none vs 10) and rating (5.0 vs 4.6). Onoff Numbers's advantage is update cadence (every 2 weeks vs every 14 months) and ratings volume (793 vs 7). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Onoff Numbers sells 9 in-app purchases, starting at $7.99 per month. OpusTel asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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 793 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 44% of Onoff Numbers's written reviews are positive against 80% of OpusTel's.

UpkeepUpdate frequency

Onoff Numbers ships an update every 2 weeks, OpusTel every 14 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard6 real differences · 4 level
Onoff Numbers versus OpusTel: the parameters behind the verdict, then further details
ParameterOnoff NumbersOpusTel
PriceFreeFree
Rating4.6 (793 ratings)5.0 (7 ratings) — better
Positive reviews43.8% of reviews80.0% of reviews — better
Number of ratings793 — better7
Update frequencyEvery 2 weeks — betterEvery 14 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad — betteriPhone
Requires iOS16.016.0
Further details — not scored
Size319 MB98 MB
Age rating4+4+
DeveloperONOFFAPPOpusTel

Customer experience

Onoff Numbers

All ratings793 ratings
Positive90.3%
Neutral1.5%
Negative8.2%
Written reviews322 reviews
Positive43.8%
Neutral6.2%
Negative50.0%

OpusTel

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

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

9 purchases

Onoff Numbers

Subscriptions4
  • Onoff Premium7 Days trial$7.991 Month
  • 1 month$10.991 Month
  • 1 month$17.991 Month
Show 1 more
  • 1 month$21.491 Month
One-time5
  • 100 credits$1.99
  • 1000 credits$9.99
  • 1 month$10.99
Show 2 more
  • 1 month$12.99
  • 1 month2 variants$17.99
None

OpusTel

No in-app purchases

Questions

Is Onoff Numbers free?
Onoff Numbers is free to download, with in-app purchases available.
Is OpusTel free?
OpusTel is free to download, with no in-app purchases.
Which has better reviews, Onoff Numbers or OpusTel?
OpusTel is rated higher. Onoff Numbers averages 4.6 out of 5 from 793 ratings, while OpusTel averages 5.0 from 7 ratings.
Do Onoff Numbers or OpusTel have ads?
Neither Onoff Numbers nor OpusTel shows ads.
Which is updated more often, Onoff Numbers or OpusTel?
Onoff Numbers ships an update every 2 weeks, and OpusTel every 14 months. Most recently, Onoff Numbers was updated on November 6, 2026 and OpusTel on November 1, 2026.

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