# Custom Formulas

> Create and manage linked custom calculation formulas with customizable inputs and outputs. (iPhone/iPad app by Anthony Dunk.)

- Source: https://appshunter.io/ios/app/custom-formulas/id1623368630 (this page in markdown: same URL + `.md`)
- Developer: [Anthony Dunk](https://appshunter.io/developer/704471943)
- Category: Utilities
- Price: $3.99
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.4 · 1 MB
- Languages: American English
- Released: 2022-05-10
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/custom-formulas/id1623368630/reviews.md

## What is Custom Formulas?

This app is easy to use, but unlike simpler apps, multiple entered values can be fed into multiple formulas and multiple output values can be displayed. The output of one formula in a group can be fed into the next by using the same variable name.

Related formulas can be grouped into categories to make them easy to find. e.g. Maths formulas, Surveying formulas, Loan interest formulas etc.

The order of variables displayed to the user can be changed, as can the number of decimal digits of precision shown in the output fields.

You can easily share formulas with other users of the app by emailing them.

Three example formulas are pre-installed with the app. In order of increasing complexity they are: slope percentage, compound interest, and point scale factor.

## Key features

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

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/custom-formulas/id1623368630/reviews.md

### 4/5 — Loved it on Android...

*2023-08-29*

But the iOS version doesn't "see" the .cf files that I exported from my old Android phone. I transferred them and saved all of them in the same directory used by the app to export. Yet out of 19 total files (17 Android 2 iOS), it only recognizes the 2 I exported.

**Developer response:** To help resolve this issue, please email an example of a .cf file exported from Android which does not import into the iOS version to info@binaryearth.net. Thanks.

## Frequently asked questions about Custom Formulas

### What is the price of Custom Formulas?

Custom Formulas is a paid app, costing $3.99. This one-time purchase grants you access to all its features.

### Does Custom Formulas have ads?

No, Custom Formulas is ad-free. You can use all its functionalities without any interruptions from advertisements.

### What devices does Custom Formulas support?

Custom Formulas is available for iPhone, iPad, and iPod touch devices, running on iOS.

### How often is Custom Formulas updated?

The app was last updated on May 15, 2024, with version 1.7. This indicates a commitment to ongoing development and improvements.

### What is the age rating for Custom Formulas?

Custom Formulas has an age rating of 4+, making it suitable for a wide range of users.

### Can I share my custom formulas with others?

Yes, you can easily share your custom formulas with other users of the app by emailing them directly from within the application.

### What kind of formulas are pre-installed in Custom Formulas?

The app comes with three example formulas: slope percentage, compound interest, and point scale factor, ranging in complexity.

### How does Custom Formulas handle complex calculations?

It allows multiple entered values to feed into multiple formulas, with outputs of one formula potentially becoming inputs for another using the same variable name.

## Version history (last 5 releases)

### 1.7 — 2024-05-15

Fixed bug with formulas containing single letter variable names.

### 1.6 — 2022-11-17

Bug fixes

### 1.5 — 2022-06-03

Added an option on the main page menu to rate and review the app.

### 1.4 — 2022-05-21

Added the ability to email and open formula group .cf files.

### 1.3 — 2022-05-16

Added the ability to import and export formula groups

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## More apps by Anthony Dunk

- [Handy GPS](https://appshunter.io/ios/app/handy-gps/id704471940)
- [Handy GPS lite](https://appshunter.io/ios/app/handy-gps-lite/id801877986)
- [Coordinate Master](https://appshunter.io/ios/app/coordinate-master/id1189917015)
- [Sky Light Pro](https://appshunter.io/ios/app/sky-light-pro/id1527400103)
- [Handy Surveying](https://appshunter.io/ios/app/handy-surveying/id1575016601)
- [Rock Art Enhancer](https://appshunter.io/ios/app/rock-art-enhancer/id1615010892)

All apps by Anthony Dunk: https://appshunter.io/developer/704471943

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*