# PLCLink vs DB40X

The clearest difference is price: DB40X at Free against PLCLink's $8.99. DB40X also leads on update cadence (every 3 weeks vs every 2 months). PLCLink's advantage is iOS requirement (12.0 vs 14.0). On ads, in-app purchases and device support there is nothing between them.

DB40X is free to download; PLCLink costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PLCLink ships an update every 2 months, DB40X every 3 weeks. The most recent releases landed on September 28, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | PLCLink | DB40X |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | — | **[4.7 (7 ratings)](https://appshunter.io/ios/app/db40x/id6624315901/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 4 MB | 7 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Jean-Francois Pautex](https://appshunter.io/developer/286566990) | [Christophe de Dinechin](https://appshunter.io/developer/1761608161) |

## What reviewers say

### PLCLink

[App page](https://appshunter.io/ios/app/plclink/id413051647)

**Features:** macOS Compatibility

**In-app purchases:** none


### DB40X

[App page](https://appshunter.io/ios/app/db40x/id6624315901)

A high-precision scientific calculator inspired by the HP48 series, offering arbitrary precision computations, complex numbers, vectors, matrices, and graphing. It supports RPN and algebraic operations, with over 1000 built-in functions and a hyperlinked help system.

**Highlights:** Arbitrary precision computations, RPN and algebraic operations, Complex numbers, vectors, and matrices, Graphing and plotting, Engineering units and conversions, Hyperlinked help system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PLCLink free?

PLCLink costs $8.99, with no in-app purchases.

### Is DB40X free?

DB40X is free to download, with no in-app purchases.

### Do PLCLink or DB40X have ads?

Neither PLCLink nor DB40X shows ads.

### Which is updated more often, PLCLink or DB40X?

PLCLink ships an update every 2 months, and DB40X every 3 weeks. Most recently, PLCLink was updated on September 28, 2026 and DB40X on October 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.*