# String vs UpCentral.io

The clearest difference is rating: UpCentral.io at 5.0 against String's 3.5. UpCentral.io also leads on monetization model (free vs free with in-app purchases) and update cadence (every 3 weeks vs every 2 months). String's advantage is ratings volume (62 vs 1). On price, ads, in-app purchases and device support there is nothing between them.

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

UpCentral.io 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.

String ships an update every 2 months, UpCentral.io every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | String | UpCentral.io |
| --- | --- | --- |
| 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/upcentralio/id6466556584/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 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 68 MB | 29 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NumberBarn, LLC](https://appshunter.io/developer/1031383867) | [UpCentral](https://appshunter.io/developer/1707467452) |

## 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


### UpCentral.io

[App page](https://appshunter.io/ios/app/upcentralio/id6466556584)

This business phone system transforms your mobile device into a comprehensive communication hub for small businesses. Handle calls and SMS messages with customers and vendors, ensuring you stay connected from any location with a reliable cloud-based solution.

**Highlights:** Business phone system, Mobile call management, SMS communication, Cloud-based solution, Easy-to-use interface

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

**In-app purchases:** none


## Frequently asked questions

### Is String free?

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

### Is UpCentral.io free?

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

### Which has better reviews, String or UpCentral.io?

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

### Do String or UpCentral.io have ads?

Neither String nor UpCentral.io shows ads.

### Which is updated more often, String or UpCentral.io?

String ships an update every 2 months, and UpCentral.io every 3 weeks. Most recently, String was updated on October 24, 2026 and UpCentral.io on October 24, 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.*