# CallingU Softphone vs UUSolar

The clearest difference is update cadence: UUSolar at monthly against CallingU Softphone's every 7 months. UUSolar also leads on iOS requirement (12.0 vs 16.0). 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.

CallingU Softphone ships an update every 7 months, UUSolar monthly. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | CallingU Softphone | UUSolar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Size | 109 MB | 47 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [FIBRE TELECOM NETWORKS LTD](https://appshunter.io/developer/1616517943) | [泽炜 李](https://appshunter.io/developer/1774184312) |

## What reviewers say

### CallingU Softphone

[App page](https://appshunter.io/ios/app/callingu-softphone/id1616517941)

**In-app purchases:** none


### UUSolar

[App page](https://appshunter.io/ios/app/uusolar/id6737028315)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CallingU Softphone free?

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

### Is UUSolar free?

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

### Do CallingU Softphone or UUSolar have ads?

Neither CallingU Softphone nor UUSolar shows ads.

### Which is updated more often, CallingU Softphone or UUSolar?

CallingU Softphone ships an update every 7 months, and UUSolar monthly. Most recently, CallingU Softphone was updated on November 7, 2026 and UUSolar on November 8, 2026.

---

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