# CalcKit vs Achromator

The clearest difference is update cadence: Achromator at monthly against CalcKit's every 30 months. CalcKit's advantage is iOS requirement (15.6 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CalcKit ships an update every 30 months, Achromator monthly. The most recent releases landed on June 11, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | CalcKit | Achromator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Monthly** |
| Monetization | Free | — |
| Size | 0 MB | 1 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Akkyra Systems](https://appshunter.io/developer/300710095) | [HANS-JURGEN GRAF GROTE](https://appshunter.io/developer/1787606413) |

## 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


### Achromator

[App page](https://appshunter.io/ios/app/achromator/id6739949388)

**In-app purchases:** none


## Frequently asked questions

### Is CalcKit free?

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

### Is Achromator free?

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

### Do CalcKit or Achromator have ads?

Neither CalcKit nor Achromator shows ads.

### Which is updated more often, CalcKit or Achromator?

CalcKit ships an update every 30 months, and Achromator monthly. Most recently, CalcKit was updated on June 11, 2026 and Achromator on September 22, 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.*