# Conversion Calculator vs ReefKeep

The clearest difference is update cadence: ReefKeep at daily against Conversion Calculator's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Conversion Calculator sells 1 one-off in-app purchase and ReefKeep sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Conversion Calculator ships an update every 5 weeks, ReefKeep daily. Both last shipped on October 9, 2026.

## The numbers

| Metric | Conversion Calculator | ReefKeep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (157 ratings)](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523/reviews)** | — |
| Number of ratings | **157** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Collins Cheruiyot](https://appshunter.io/developer/1579009978) | [Enovira AB](https://appshunter.io/developer/1878624311) |

## What reviewers say

### Conversion Calculator

[App page](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523)

Easily convert between metric and imperial units for weight, length, temperature, area, and time. This app offers precise, fast results with a clean interface, working offline for daily, travel, school, or work needs.

**Highlights:** Metric and imperial unit conversion, Weight, length, temperature, area, time, Offline functionality, Precise and fast results, Clean and minimal interface, Over 100 measurement types

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access forever | $8.99 | one-time |


### ReefKeep

[App page](https://appshunter.io/ios/app/reefkeep/id6762442240)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReefKeep Pro - monthly | $4.99 | per month |
| ReefKeep Pro - Yearly | $29.99 | per year |
| ReefKeep Lifetime Subscription | $79.99 | one-time |


## Frequently asked questions

### Is Conversion Calculator free?

Conversion Calculator is free to download, with in-app purchases available.

### Is ReefKeep free?

ReefKeep is free to download, with in-app purchases available.

### Do Conversion Calculator or ReefKeep have ads?

Neither Conversion Calculator nor ReefKeep shows ads.

### Which is updated more often, Conversion Calculator or ReefKeep?

Conversion Calculator ships an update every 5 weeks, and ReefKeep daily. Most recently, Conversion Calculator was updated on October 9, 2026 and ReefKeep on October 9, 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.*