# CalcKit vs Formula Calculator #

The clearest difference is in-app purchases: CalcKit at none against Formula Calculator #'s 4. CalcKit also leads on ads (none vs shown). Formula Calculator #'s advantage is update cadence (every 5 weeks vs every 30 months) and review sentiment (100% vs 80%). On price and device support there is nothing between them.

Both are free to download. Formula Calculator # sells 4 one-off in-app purchases. CalcKit asks for nothing beyond the download.

CalcKit ships an update every 30 months, Formula Calculator # every 5 weeks. The most recent releases landed on June 11, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | CalcKit | Formula Calculator # |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/formula-calculator/id6504839903/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 30 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 0 MB | 67 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Akkyra Systems](https://appshunter.io/developer/300710095) | [威 刘](https://appshunter.io/developer/1465235012) |

## 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


### Formula Calculator #

[App page](https://appshunter.io/ios/app/formula-calculator/id6504839903)

Perform calculations with a vast library of built-in formulas or create your own. Save and sync custom formulas to the cloud for easy access across devices. Includes a comprehensive scientific calculator.

**Highlights:** Extensive built-in calculation formulas, Create and save custom formulas, Cloud synchronization for custom formulas, Share custom formulas with others, Comprehensive scientific calculator

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month subscription | $1.49 | one-time |
| 3 months subscription | $2.49 | one-time |
| 6 months subscription | $3.49 | one-time |
| 1 year subscription | $4.49 | one-time |


## Frequently asked questions

### Is CalcKit free?

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

### Is Formula Calculator # free?

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

### Do CalcKit or Formula Calculator # have ads?

Formula Calculator # shows ads; CalcKit does not.

### Which is updated more often, CalcKit or Formula Calculator #?

CalcKit ships an update every 30 months, and Formula Calculator # every 5 weeks. Most recently, CalcKit was updated on June 11, 2026 and Formula Calculator # on September 14, 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.*