# SolarViewer vs ONESTO SOLAR

The clearest difference is update cadence: SolarViewer at every 5 weeks against ONESTO SOLAR's every 4 months. 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.

SolarViewer ships an update every 5 weeks, ONESTO SOLAR every 4 months. The most recent releases landed on September 6, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | SolarViewer | ONESTO SOLAR |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Size | 36 MB | 59 MB |
| Requires iOS | 8.0 | 8.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [AsianPowerDevicesInc](https://appshunter.io/developer/1214788661) | [Zhejiang Onesto Electric Co.,Ltd.](https://appshunter.io/developer/1705153314) |

## What reviewers say

### SolarViewer

[App page](https://appshunter.io/ios/app/solarviewer/id1462404751)

**Features:** macOS Compatibility

**In-app purchases:** none


### ONESTO SOLAR

[App page](https://appshunter.io/ios/app/onesto-solar/id6443592685)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SolarViewer free?

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

### Is ONESTO SOLAR free?

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

### Do SolarViewer or ONESTO SOLAR have ads?

Neither SolarViewer nor ONESTO SOLAR shows ads.

### Which is updated more often, SolarViewer or ONESTO SOLAR?

SolarViewer ships an update every 5 weeks, and ONESTO SOLAR every 4 months. Most recently, SolarViewer was updated on September 6, 2026 and ONESTO SOLAR on September 5, 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.*