# Linear Interpolation Master vs MRLDS 400

The clearest difference is in-app purchases: MRLDS 400 at none against Linear Interpolation Master's 3. MRLDS 400 also leads on ads (none vs shown). Linear Interpolation Master's advantage is iOS requirement (11.0 vs 14.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Linear Interpolation Master sells 3 one-off in-app purchases. MRLDS 400 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 18, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Linear Interpolation Master | MRLDS 400 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (176 ratings)](https://appshunter.io/ios/app/linear-interpolation-master/id1433976994/reviews)** | — |
| Number of ratings | **176** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 8 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VERVE TECHNOLOGIES PTY. LTD.](https://appshunter.io/developer/582523354) | [Copeland LP](https://appshunter.io/developer/464252882) |

## What reviewers say

### Linear Interpolation Master

[App page](https://appshunter.io/ios/app/linear-interpolation-master/id1433976994)

This tool simplifies linear interpolation calculations for industrial commissioning engineers. It features large, easily readable numbers for field use and allows for quick swapping of coordinate systems, such as converting between 4-20mA and 0-100% scales.

**Highlights:** Large number display for field visibility, Quickly swap X and Y coordinates, 4-20mA to 0-100% conversion, 0-100% to 4-20mA conversion

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Generous Tip | $2.99 | one-time |
| Massive Tip | $3.99 | one-time |
| Amazing Tip | $4.99 | one-time |


### MRLDS 400

[App page](https://appshunter.io/ios/app/mrlds-400/id1502566407)

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

**In-app purchases:** none


## Frequently asked questions

### Is Linear Interpolation Master free?

Linear Interpolation Master is free to download, with in-app purchases available.

### Is MRLDS 400 free?

MRLDS 400 is free to download, with no in-app purchases.

### Do Linear Interpolation Master or MRLDS 400 have ads?

Linear Interpolation Master shows ads; MRLDS 400 does not.

### Which is updated more often, Linear Interpolation Master or MRLDS 400?

Linear Interpolation Master ships an update every 5 months, and MRLDS 400 every 5 months. Most recently, Linear Interpolation Master was updated on October 18, 2026 and MRLDS 400 on September 28, 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.*