# DP vs CO2 Filter Calc

The clearest difference is update cadence: CO2 Filter Calc at weekly against DP's every 16 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.

DP ships an update every 16 months, CO2 Filter Calc weekly. The most recent releases landed on October 1, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | DP | CO2 Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/dp-select/id934888136/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Weekly** |
| Monetization | Free | — |
| Size | 15 MB | 1 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DP Pumps](https://appshunter.io/developer/934888135) | [TOMCO2 Systems Company](https://appshunter.io/developer/1683554220) |

## What reviewers say

### DP

[App page](https://appshunter.io/ios/app/dp-select/id934888136)

This tool helps users configure and select DP pumps for their specific applications. It provides detailed product information, including technical specifications, hydraulic curves, and dimensions, based on your selection criteria.

**Highlights:** Intuitive product configuration, Selection via hydraulic data (Q, H), Replacement product comparison, Direct pump type selection, Technical specification sheets, Hydraulic curves, Dimensions and drawings

**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 DP free?

DP 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 DP or CO2 Filter Calc have ads?

Neither DP nor CO2 Filter Calc shows ads.

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

DP ships an update every 16 months, and CO2 Filter Calc weekly. Most recently, DP was updated on October 1, 2026 and CO2 Filter Calc on October 2, 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.*