# Interpolator vs TLV ToolBox

The clearest difference is rating: Interpolator at 4.9 against TLV ToolBox's 4.5. Interpolator also leads on ratings volume (74 vs 8). TLV ToolBox's advantage is review sentiment (75% vs 67%) and iOS requirement (9.3 vs 12.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Interpolator holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Interpolator has 74 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 67% of Interpolator's written reviews are positive against 75% of TLV ToolBox's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 26, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Interpolator | TLV ToolBox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (74 ratings)](https://appshunter.io/ios/app/interpolator/id635235982/reviews)** | [4.5 (8 ratings)](https://appshunter.io/ios/app/tlv-toolbox/id653406777/reviews) |
| Number of ratings | **74** | 8 |
| Positive reviews | 66.7% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | Free |
| Size | 18 MB | 4 MB |
| Requires iOS | 12.0 | **9.3** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [ron mooring](https://appshunter.io/developer/612283157) | [TLV CO.,LTD.](https://appshunter.io/developer/653406780) |

## What reviewers say

### Interpolator

[App page](https://appshunter.io/ios/app/interpolator/id635235982)

Easily find values within tables using interpolation for two or three rows. This utility app simplifies calculations without needing a separate calculator, making it ideal for various table-based environments.

**Highlights:** Two-row interpolation, Three-row interpolation, Table value lookup, No calculator needed, Cargo surveyor tool, General table use

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Interpolator free?

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

### Is TLV ToolBox free?

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

### Which has better reviews, Interpolator or TLV ToolBox?

Interpolator is rated higher. Interpolator averages 4.9 out of 5 from 74 ratings, while TLV ToolBox averages 4.5 from 8 ratings.

### Do Interpolator or TLV ToolBox have ads?

Neither Interpolator nor TLV ToolBox shows ads.

### Which is updated more often, Interpolator or TLV ToolBox?

Interpolator ships an update every 4 months, and TLV ToolBox every 4 months. Most recently, Interpolator was updated on September 26, 2026 and TLV ToolBox on October 8, 2026.

---

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