# String vs vtxMobile

The clearest difference is rating: vtxMobile at 5.0 against String's 3.5. vtxMobile also leads on monetization model (free vs free with in-app purchases). String's advantage is ratings volume (62 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence, 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.

vtxMobile holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: String has 62 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | String | vtxMobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (62 ratings)](https://appshunter.io/ios/app/string-modern-phone-inbox/id1445655431/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/vtxmobile/id1559019847/reviews)** |
| Number of ratings | **62** | 1 |
| Positive reviews | 68.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 68 MB | 124 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NumberBarn, LLC](https://appshunter.io/developer/1031383867) | [Kloud Communications Inc.](https://appshunter.io/developer/1598998448) |

## What reviewers say

### String

[App page](https://appshunter.io/ios/app/string-modern-phone-inbox/id1445655431)

Enhance customer engagement with a business SMS and voice platform. Organize your inbox, automate responses, and manage contacts efficiently. Send personalized messages to individuals or groups, and access your workflow from any device.

**Highlights:** Use existing or new phone numbers, Organize inbox with sales funnel view, Automated responses and auto-replies, Contact management and CRM integrations, 1-1, group, and mass messaging, Templates and voicemail transcription, Browser and mobile app access

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

**In-app purchases:** none


### vtxMobile

[App page](https://appshunter.io/ios/app/vtxmobile/id1559019847)

This app transforms your mobile device into a business phone extension, enabling free inter-office calls and cost-effective international communication. It offers features like voicemail, call transfer, and team messaging for seamless on-the-go business operations.

**Highlights:** Free inter-office extension calls, Company caller ID, Cost-effective international calls, Three-way calling, Call transfer, Voicemail, Team messaging

**Features:** macOS Compatibility, Siri integration

**In-app purchases:** none


## Frequently asked questions

### Is String free?

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

### Is vtxMobile free?

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

### Which has better reviews, String or vtxMobile?

vtxMobile is rated higher. String averages 3.5 out of 5 from 62 ratings, while vtxMobile averages 5.0 from 1 ratings.

### Do String or vtxMobile have ads?

Neither String nor vtxMobile shows ads.

### Which is updated more often, String or vtxMobile?

String ships an update every 2 months, and vtxMobile every 2 months. Most recently, String was updated on October 24, 2026 and vtxMobile on October 6, 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.*