# CO2 Filter Calc vs Solar Live

The clearest difference is update cadence: Solar Live at every 4 days against CO2 Filter Calc's weekly. CO2 Filter Calc's advantage is iOS requirement (14.0 vs 26.0). 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.

CO2 Filter Calc ships an update weekly, Solar Live every 4 days. The most recent releases landed on October 18, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | CO2 Filter Calc | Solar Live |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Size | 1 MB | 4 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TOMCO2 Systems Company](https://appshunter.io/developer/1683554220) | [Cloud App Labs](https://appshunter.io/developer/1731035092) |

## What reviewers say

### CO2 Filter Calc

[App page](https://appshunter.io/ios/app/co2-filter-calc/id6448122642)

**Features:** macOS Compatibility

**In-app purchases:** none


### Solar Live

[App page](https://appshunter.io/ios/app/solar-live/id6762562178)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CO2 Filter Calc free?

CO2 Filter Calc is free to download, with no in-app purchases.

### Is Solar Live free?

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

### Do CO2 Filter Calc or Solar Live have ads?

Neither CO2 Filter Calc nor Solar Live shows ads.

### Which is updated more often, CO2 Filter Calc or Solar Live?

CO2 Filter Calc ships an update weekly, and Solar Live every 4 days. Most recently, CO2 Filter Calc was updated on October 18, 2026 and Solar Live 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.*