# FlexCalc vs ThisKey

The clearest difference is update cadence: ThisKey at every 6 days against FlexCalc's every 3 weeks. FlexCalc's advantage is iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FlexCalc sells 1 one-off in-app purchase and ThisKey sells 3 in-app purchases, starting at $14.99 per year. Whichever you choose, the download price is not the number that matters.

FlexCalc ships an update every 3 weeks, ThisKey every 6 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | FlexCalc | ThisKey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flexcalc-flexible-calculator/id6785043241/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 21 MB | 433 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tho Tran](https://appshunter.io/developer/1110817755) | [peerapong Suddhapas](https://appshunter.io/developer/6806118704) |

## What reviewers say

### FlexCalc

[App page](https://appshunter.io/ios/app/flexcalc-flexible-calculator/id6785043241)

This utility app allows users to create and edit calculations with linked values that update instantly. It offers a history feature to review past work and supports sharing calculations. Users can also customize themes and fonts for a personalized experience.

**Highlights:** Editable calculations, Linked values update automatically, Reuse results in new calculations, Calculation history, Share calculations, Customizable themes and fonts, Scientific functions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy a Coffee | $1.99 | one-time |


### ThisKey

[App page](https://appshunter.io/ios/app/thiskey/id6806118702)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThisKey Annual | $14.99 | per year |
| 15-day Trial | Free | one-time |
| ThisKey Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is FlexCalc free?

FlexCalc is free to download, with in-app purchases available.

### Is ThisKey free?

ThisKey is free to download, with in-app purchases available.

### Do FlexCalc or ThisKey have ads?

Neither FlexCalc nor ThisKey shows ads.

### Which is updated more often, FlexCalc or ThisKey?

FlexCalc ships an update every 3 weeks, and ThisKey every 6 days. Most recently, FlexCalc was updated on October 25, 2026 and ThisKey on October 29, 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.*