# TLV ToolBox vs Linear Interpolation Master

The clearest difference is in-app purchases: TLV ToolBox at none against Linear Interpolation Master's 3. TLV ToolBox also leads on ads (none vs shown) and review sentiment (75% vs 63%). Linear Interpolation Master's advantage is ratings volume (176 vs 8) and rating (4.7 vs 4.5). 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. TLV ToolBox asks for nothing beyond the download.

Linear Interpolation Master holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Linear Interpolation Master has 176 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 75% of TLV ToolBox's written reviews are positive against 63% of Linear Interpolation Master's, so the app with the better star average is not the one people write more warmly about.

TLV ToolBox ships an update every 4 months, Linear Interpolation Master every 5 months. The most recent releases landed on September 21, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | TLV ToolBox | Linear Interpolation Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/tlv-toolbox/id653406777/reviews) | **[4.7 (176 ratings)](https://appshunter.io/ios/app/linear-interpolation-master/id1433976994/reviews)** |
| Number of ratings | 8 | **176** |
| Positive reviews | **75.0% of reviews** | 62.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 16 MB |
| Requires iOS | **9.3** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TLV CO.,LTD.](https://appshunter.io/developer/653406780) | [VERVE TECHNOLOGIES PTY. LTD.](https://appshunter.io/developer/582523354) |

## What reviewers say

### TLV ToolBox

[App page](https://appshunter.io/ios/app/tlv-toolbox/id653406777)

This utility app transforms your mobile device into a portable steam calculation tool. It assists with onsite calculations for control valve stations, condensate recovery systems, and various maintenance tasks, reducing the need for multiple trips.

**Highlights:** Steam Tables (saturated and superheated), Steam Pipe Sizing, Condensate Pipe Sizing, Heating Calculations, Cv and Kv Values, Stall Point

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is TLV ToolBox free?

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

### Is Linear Interpolation Master free?

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

### Which has better reviews, TLV ToolBox or Linear Interpolation Master?

Linear Interpolation Master is rated higher. TLV ToolBox averages 4.5 out of 5 from 8 ratings, while Linear Interpolation Master averages 4.7 from 176 ratings.

### Do TLV ToolBox or Linear Interpolation Master have ads?

Linear Interpolation Master shows ads; TLV ToolBox does not.

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

TLV ToolBox ships an update every 4 months, and Linear Interpolation Master every 5 months. Most recently, TLV ToolBox was updated on September 21, 2026 and Linear Interpolation Master on September 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*