# Linear Interpolation Master vs EPRALA

The clearest difference is in-app purchases: EPRALA at none against Linear Interpolation Master's 3. EPRALA also leads on ads (none vs shown) and update cadence (every 2 months vs every 5 months). Linear Interpolation Master's advantage is iOS requirement (11.0 vs 15.6). On price and device support there is nothing between them.

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

Linear Interpolation Master ships an update every 5 months, EPRALA every 2 months. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Linear Interpolation Master | EPRALA |
| --- | --- | --- |
| 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 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 37 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VERVE TECHNOLOGIES PTY. LTD.](https://appshunter.io/developer/582523354) | [Ardiansyah Setiawan Suci](https://appshunter.io/developer/1827901000) |

## 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 |


### EPRALA

[App page](https://appshunter.io/ios/app/eprala/id6748902605)

**Features:** macOS Compatibility

**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 EPRALA free?

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

### Do Linear Interpolation Master or EPRALA have ads?

Linear Interpolation Master shows ads; EPRALA does not.

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

Linear Interpolation Master ships an update every 5 months, and EPRALA every 2 months. Most recently, Linear Interpolation Master was updated on October 10, 2026 and EPRALA on October 5, 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.*