# Metric Converters vs Custom Formulas

The clearest difference is update cadence: Custom Formulas at every 5 days against Metric Converters's every 38 months. Metric Converters's advantage is price ($0.99 vs $3.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Metric Converters costs $0.99 and Custom Formulas $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Metric Converters ships an update every 38 months, Custom Formulas every 5 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Metric Converters | Custom Formulas |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/custom-formulas/id1623368630/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 5 days** |
| Monetization | — | Paid |
| Size | 20 MB | 1 MB |
| Requires iOS | **14.1** | 15.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [H Valeur](https://appshunter.io/developer/621824042) | [Anthony Dunk](https://appshunter.io/developer/704471943) |

## What reviewers say

### Metric Converters

[App page](https://appshunter.io/ios/app/metric-converters/id1570182170)

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

**In-app purchases:** none


### Custom Formulas

[App page](https://appshunter.io/ios/app/custom-formulas/id1623368630)

This utility app allows users to create and manage complex calculations with multiple inputs and outputs. Formulas can be linked, grouped into categories, and customized for display precision. Share your custom calculations easily via email.

**Highlights:** Multiple input/output formula support, Linked formulas via variable names, Formula categorization, Customizable variable display order, Adjustable output decimal precision, Email formula sharing

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

**In-app purchases:** none


## Frequently asked questions

### Is Metric Converters free?

Metric Converters costs $0.99, with no in-app purchases.

### Is Custom Formulas free?

Custom Formulas costs $3.99, with no in-app purchases.

### Do Metric Converters or Custom Formulas have ads?

Neither Metric Converters nor Custom Formulas shows ads.

### Which is updated more often, Metric Converters or Custom Formulas?

Metric Converters ships an update every 38 months, and Custom Formulas every 5 days. Most recently, Metric Converters was updated on October 23, 2026 and Custom Formulas on October 24, 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.*