# Interpolator vs Oil density

The clearest difference is review sentiment: Interpolator at 67% against Oil density's 0%. Interpolator also leads on rating (4.9 vs 1.0) and in-app purchases (none vs 2). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Oil density sells 2 one-off in-app purchases. Interpolator asks for nothing beyond the download.

Interpolator holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Interpolator has 74 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 67% of Interpolator's written reviews are positive against 0% of Oil density's.

Interpolator ships an update every 4 months, Oil density every 47 months. The most recent releases landed on September 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Interpolator | Oil density |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (74 ratings)](https://appshunter.io/ios/app/interpolator/id635235982/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/oil-density/id1641733273/reviews) |
| Number of ratings | **74** | 1 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 47 months |
| Monetization | Free | Free |
| Size | 18 MB | 7 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [ron mooring](https://appshunter.io/developer/612283157) | [昆 张](https://appshunter.io/developer/517645105) |

## 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


### Oil density

[App page](https://appshunter.io/ios/app/oil-density/id1641733273)

This tool calculates the standard density of oil products based on measured apparent density. It automatically queries density tables and computes volume correction factors for accurate standard volume and mass calculations. Improve efficiency and accuracy compared to manual methods.

**Highlights:** Calculates standard oil density, Queries petroleum density tables, Computes volume correction factor (VCF), Calculates standard volume and mass, Adheres to GB/T 1885-1998 national standard

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly card | $2.99 | one-time |
| Lifetime Card | $8.99 | one-time |


## Frequently asked questions

### Is Interpolator free?

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

### Is Oil density free?

Oil density is free to download, with in-app purchases available.

### Which has better reviews, Interpolator or Oil density?

Interpolator is rated higher. Interpolator averages 4.9 out of 5 from 74 ratings, while Oil density averages 1.0 from 1 ratings.

### Do Interpolator or Oil density have ads?

Neither Interpolator nor Oil density shows ads.

### Which is updated more often, Interpolator or Oil density?

Interpolator ships an update every 4 months, and Oil density every 47 months. Most recently, Interpolator was updated on September 9, 2026 and Oil density on September 23, 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.*