# Linear Interpolation Master vs ROIs Crew

The clearest difference is review sentiment: Linear Interpolation Master at 63% against ROIs Crew's 0%. Linear Interpolation Master also leads on iOS requirement (11.0 vs 13.0). ROIs Crew's advantage is in-app purchases (none vs 3) and ads (none vs shown). 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. ROIs Crew asks for nothing beyond the download.

Linear Interpolation Master ships an update every 5 months, ROIs Crew every 2 months. The most recent releases landed on September 27, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Linear Interpolation Master | ROIs Crew |
| --- | --- | --- |
| 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** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 16 MB | 49 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VERVE TECHNOLOGIES PTY. LTD.](https://appshunter.io/developer/582523354) | [HangZhou Pi-Solution Information Technology Co.,Ltd](https://appshunter.io/developer/1492626729) |

## 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 |


### ROIs Crew

[App page](https://appshunter.io/ios/app/rois-crew/id6738641790)

Manage your flight schedule, track performance metrics, and update qualifications. Receive alerts for travel documents and log post-flight reports. Stay informed about roster and flight changes with real-time notifications.

**Highlights:** View personal rosters and flight details, Track duty hours and block times, Receive travel document expiry alerts, Log post-flight reports, Real-time notifications on roster/flight changes, Update crew qualifications & contacts

**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 ROIs Crew free?

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

### Do Linear Interpolation Master or ROIs Crew have ads?

Linear Interpolation Master shows ads; ROIs Crew does not.

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

Linear Interpolation Master ships an update every 5 months, and ROIs Crew every 2 months. Most recently, Linear Interpolation Master was updated on September 27, 2026 and ROIs Crew on September 21, 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.*