# TDSBot vs CO2 Filter Calc

The clearest difference is update cadence: CO2 Filter Calc at weekly against TDSBot's every 2 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.

TDSBot ships an update every 2 months, CO2 Filter Calc weekly. The most recent releases landed on October 3, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | TDSBot | CO2 Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 48 MB | 1 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WaterTDS Inc](https://appshunter.io/developer/1529399108) | [TOMCO2 Systems Company](https://appshunter.io/developer/1683554220) |

## What reviewers say

### TDSBot

[App page](https://appshunter.io/ios/app/tdsbot/id1534287431)

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

**In-app purchases:** none


### CO2 Filter Calc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TDSBot free?

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

### Is CO2 Filter Calc free?

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

### Do TDSBot or CO2 Filter Calc have ads?

Neither TDSBot nor CO2 Filter Calc shows ads.

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

TDSBot ships an update every 2 months, and CO2 Filter Calc weekly. Most recently, TDSBot was updated on October 3, 2026 and CO2 Filter Calc on October 18, 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.*