# Calculy vs ESRA secure

The clearest difference is in-app purchases: ESRA secure at none against Calculy's 3. Calculy's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Calculy sells 3 one-off in-app purchases. ESRA secure asks for nothing beyond the download.

Calculy ships an update every 2 weeks, ESRA secure every 2 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Calculy | ESRA secure |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calculy/id1605142327/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 91.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 3 MB | 129 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lingo4you Mario Muller und Heike Pahlow GbR](https://appshunter.io/developer/395530887) | [Simon Strobel](https://appshunter.io/developer/1643926125) |

## What reviewers say

### Calculy

[App page](https://appshunter.io/ios/app/calculy/id1605142327)

This free calculator app offers advanced functions beyond basic arithmetic, including a comprehensive unit converter with daily updated currency rates. It supports a wide range of mathematical operations and is available for iPhone and iPad.

**Highlights:** Advanced mathematical functions, Unit converter with 220+ units, Daily updated currency rates, Supports iPad expanded layout, Hardware keyboard support on iPad, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $0.99 | one-time |
| Buy me cookies | $1.99 | one-time |
| Buy me a pizza | $3.99 | one-time |


### ESRA secure

[App page](https://appshunter.io/ios/app/esra-secure/id1643926123)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculy free?

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

### Is ESRA secure free?

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

### Do Calculy or ESRA secure have ads?

Neither Calculy nor ESRA secure shows ads.

### Which is updated more often, Calculy or ESRA secure?

Calculy ships an update every 2 weeks, and ESRA secure every 2 months. Most recently, Calculy was updated on November 3, 2026 and ESRA secure on November 7, 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.*