# StringeeX vs Callio 4.0

The clearest difference is review sentiment: StringeeX at 89% against Callio 4.0's 0%. StringeeX also leads on in-app purchases (none vs 3) and iOS requirement (13 vs 15.0). Callio 4.0's advantage is update cadence (weekly vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Callio 4.0 sells 3 one-off in-app purchases. StringeeX asks for nothing beyond the download.

StringeeX ships an update every 2 weeks, Callio 4.0 weekly. The most recent releases landed on August 3, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | StringeeX | Callio 4.0 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/callio-40/id6446872573/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | **88.9% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 46 MB | 91 MB |
| Requires iOS | **13** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stringee Joint Stock Company](https://appshunter.io/developer/1373104803) | [Gadget Technology Solution](https://appshunter.io/developer/1488302008) |

## What reviewers say

### StringeeX

[App page](https://appshunter.io/ios/app/stringeex/id1443731231)

This business communication tool allows companies to manage incoming and outgoing calls through a dedicated company hotline. It provides features for receiving customer calls, making outbound calls, and maintaining a searchable contact list with call history, all synchronized across devices via cloud storage.

**Highlights:** Receive customer calls, Make outbound calls, Searchable contact list, Record call history, Cloud synchronization

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

**In-app purchases:** none


### Callio 4.0

[App page](https://appshunter.io/ios/app/callio-40/id6446872573)

Streamline your business operations with a centralized platform for managing customer interactions across multiple channels. Track customer history, generate detailed reports, and optimize your sales process with an intuitive interface.

**Highlights:** Multi-channel conversation management, Centralized customer information, Interaction history synchronization, Detailed business activity reports, Employee performance ranking, User-friendly interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BASIC | $1.99 | one-time |
| PRO | $9.99 | one-time |
| ULTIMATE | $12.99 | one-time |


## Frequently asked questions

### Is StringeeX free?

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

### Is Callio 4.0 free?

Callio 4.0 is free to download, with in-app purchases available.

### Do StringeeX or Callio 4.0 have ads?

Neither StringeeX nor Callio 4.0 shows ads.

### Which is updated more often, StringeeX or Callio 4.0?

StringeeX ships an update every 2 weeks, and Callio 4.0 weekly. Most recently, StringeeX was updated on August 3, 2026 and Callio 4.0 on September 9, 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.*