# Touver Guide vs CO2 Filter Calc

The clearest difference is update cadence: CO2 Filter Calc at weekly against Touver Guide's every 14 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.

Touver Guide ships an update every 14 months, CO2 Filter Calc weekly. The most recent releases landed on September 17, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Touver Guide | CO2 Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (25 ratings)](https://appshunter.io/ios/app/touver-guide/id1454562461/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Weekly** |
| Monetization | Free | — |
| Size | 25 MB | 1 MB |
| Requires iOS | 15 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Deschamps Aplicativos de Software Ltda](https://appshunter.io/developer/1453217921) | [TOMCO2 Systems Company](https://appshunter.io/developer/1683554220) |

## What reviewers say

### Touver Guide

[App page](https://appshunter.io/ios/app/touver-guide/id1454562461)

This app serves as a catalog for automatic transmissions, organized by vehicle. It helps mechanics identify transmission types and models, and often suggests the correct certified fluid for maintenance.

**Highlights:** Catalog of automatic transmissions, Identifies transmission type and model, Suggests certified transmission fluid, Organized by vehicle, Works offline

**Features:** macOS Compatibility

**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 Touver Guide free?

Touver Guide 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 Touver Guide or CO2 Filter Calc have ads?

Neither Touver Guide nor CO2 Filter Calc shows ads.

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

Touver Guide ships an update every 14 months, and CO2 Filter Calc weekly. Most recently, Touver Guide was updated on September 17, 2026 and CO2 Filter Calc on September 14, 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.*