# Calctan vs 欧塬风控

The clearest difference is in-app purchases: 欧塬风控 at none against Calctan's 1. 欧塬风控 also leads on iOS requirement (12.0 vs 16.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Calctan sells 1 one-off in-app purchase. 欧塬风控 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Calctan | 欧塬风控 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (61 ratings)](https://appshunter.io/ios/app/calctan/id1445480535/reviews)** | — |
| Number of ratings | **61** | — |
| Positive reviews | 28.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | — |
| Size | 8 MB | 69 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jorge Lozada](https://appshunter.io/developer/421852863) | [hangzhou panzi technology CO.ltd](https://appshunter.io/developer/1559705409) |

## What reviewers say

### Calctan

[App page](https://appshunter.io/ios/app/calctan/id1445480535)

This app offers a high-precision scientific and financial calculator with an editable tape for auditing calculations. It supports complex formulas, a wide range of mathematical functions, and customizable constants, all within an ad-free, private interface.

**Highlights:** Smart formula workspace with direct cursor editing, Advanced scientific engine with true order of operations, Auditable calculation history on a digital tape, Exportable reports via AirPrint and PDF, Multitasking support for iPad, iCloud synchronization across devices, Private and ad-free experience

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $0.99 | one-time |


### 欧塬风控

[App page](https://appshunter.io/ios/app/id6449660328)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calctan free?

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

### Is 欧塬风控 free?

欧塬风控 is free to download, with no in-app purchases.

### Do Calctan or 欧塬风控 have ads?

Neither Calctan nor 欧塬风控 shows ads.

### Which is updated more often, Calctan or 欧塬风控?

Calctan ships an update every 3 months, and 欧塬风控 every 3 months. Most recently, Calctan was updated on November 2, 2026 and 欧塬风控 on November 3, 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.*