# CalcKit vs Custom Formulas

The clearest difference is price: CalcKit at Free against Custom Formulas's $3.99. Custom Formulas's advantage is update cadence (every 5 days vs every 30 months) and review sentiment (100% vs 80%). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

CalcKit is free to download; Custom Formulas costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CalcKit ships an update every 30 months, Custom Formulas every 5 days. The most recent releases landed on September 24, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | CalcKit | Custom Formulas |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/custom-formulas/id1623368630/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 5 days** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#172** |
| Size | 0 MB | 1 MB |
| Requires iOS | 15.6 | **15.4** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Akkyra Systems](https://appshunter.io/developer/300710095) | [Anthony Dunk](https://appshunter.io/developer/704471943) |

## What reviewers say

### CalcKit

[App page](https://appshunter.io/ios/app/calckit/id321006774)

Design and build your own custom calculators with personalized formulas and input labels. Organize them into groups for easy access. Ideal for students, scientists, and engineers needing more than standard calculator functions.

**Highlights:** Design calculators with custom formulas, Up to seven user-defined variables, Built-in trig and math functions, Organize calculators into groups, Unlimited personal calculator creation

**Features:** macOS Compatibility

**In-app purchases:** none


### Custom Formulas

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

**Currently charting:** #172 Top Paid · Utilities (US App Store)

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 CalcKit free?

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

### Is Custom Formulas free?

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

### Do CalcKit or Custom Formulas have ads?

Neither CalcKit nor Custom Formulas shows ads.

### Which is updated more often, CalcKit or Custom Formulas?

CalcKit ships an update every 30 months, and Custom Formulas every 5 days. Most recently, CalcKit was updated on September 24, 2026 and Custom Formulas on October 5, 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.*