# Flow Rate Conversion vs CoolDing

The clearest difference is price: CoolDing at Free against Flow Rate Conversion's $2.99. CoolDing also leads on update cadence (every 9 months vs every 29 months) and iOS requirement (5.1.1 vs 13). On ads, in-app purchases and device support there is nothing between them.

CoolDing is free to download; Flow Rate Conversion costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Flow Rate Conversion ships an update every 29 months, CoolDing every 9 months. The most recent releases landed on October 1, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Flow Rate Conversion | CoolDing |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/flow-rate-conversion/id525300855/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 9 months** |
| Monetization | Paid | — |
| Size | 1 MB | 39 MB |
| Requires iOS | 13 | **5.1.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Anna Technology B.V.](https://appshunter.io/developer/427593629) |

## What reviewers say

### Flow Rate Conversion

[App page](https://appshunter.io/ios/app/flow-rate-conversion/id525300855)

Easily convert between various units of flow rate, including volume-based, mass-based, and mole-based measurements. Essential for physics and engineering applications involving fluid dynamics and hydrometry.

**Highlights:** Volume flow rate conversion, Mass flow rate conversion, Mole-based flow rate conversion, Physics and engineering utility, Fluid dynamics calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### CoolDing

[App page](https://appshunter.io/ios/app/coolding/id912132568)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Flow Rate Conversion free?

Flow Rate Conversion costs $2.99, with no in-app purchases.

### Is CoolDing free?

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

### Do Flow Rate Conversion or CoolDing have ads?

Neither Flow Rate Conversion nor CoolDing shows ads.

### Which is updated more often, Flow Rate Conversion or CoolDing?

Flow Rate Conversion ships an update every 29 months, and CoolDing every 9 months. Most recently, Flow Rate Conversion was updated on October 1, 2026 and CoolDing on October 12, 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.*