# Opus VO vs Calvis

The clearest difference is rating: Calvis at 4.7 against Opus VO's 2.9. Calvis also leads on update cadence (weekly vs every 3 weeks) and review sentiment (63% vs 54%). Opus VO's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.2). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Calvis holds the better App Store score, 4.7 against 2.9. Both are backed by a comparable volume of ratings — 18 and 13 respectively. Written reviews point the same way: 54% of Opus VO's written reviews are positive against 63% of Calvis's.

Opus VO ships an update every 3 weeks, Calvis weekly. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Opus VO | Calvis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (18 ratings)](https://appshunter.io/ios/app/opus-vo/id1618812016/reviews) | **[4.7 (13 ratings)](https://appshunter.io/ios/app/calvis/id6502692141/reviews)** |
| Number of ratings | **18** | 13 |
| Positive reviews | 53.8% of reviews | **62.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 56 MB | 48 MB |
| Requires iOS | **13.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [OPUS VIRTUAL OFFICES, LLC](https://appshunter.io/developer/1618812018) | [Calvis](https://appshunter.io/developer/1746469324) |

## What reviewers say

### Opus VO

[App page](https://appshunter.io/ios/app/opus-vo/id1618812016)

Manage your company portal and account on the go. Send SMS and make calls using your company's dedicated phone number as your outbound caller ID. This app functions as your corporate phone, whether you are domestic or international.

**Highlights:** Company portal access, Account management, Send SMS, Make calls, Custom outbound caller ID, Corporate phone functionality

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Calvis

[App page](https://appshunter.io/ios/app/calvis/id6502692141)

Easily book and manage security services. For security personnel, this platform simplifies shift pickup and ensures prompt payment.

**Highlights:** Book security services, Manage security bookings, Pick up security shifts, Seamless payment for guards, Future of security management

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Opus VO free?

Opus VO is free to download, with no in-app purchases.

### Is Calvis free?

Calvis is free to download, with no in-app purchases.

### Which has better reviews, Opus VO or Calvis?

Calvis is rated higher. Opus VO averages 2.9 out of 5 from 18 ratings, while Calvis averages 4.7 from 13 ratings.

### Do Opus VO or Calvis have ads?

Neither Opus VO nor Calvis shows ads.

### Which is updated more often, Opus VO or Calvis?

Opus VO ships an update every 3 weeks, and Calvis weekly. Most recently, Opus VO was updated on October 1, 2026 and Calvis on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*