# InterCalc vs Great Circle Tool

The clearest difference is price: InterCalc at Free against Great Circle Tool's $2.99. InterCalc also leads on rating (5.0 vs 2.6). Great Circle Tool's advantage is update cadence (every 4 days vs every 11 months) and ratings volume (5 vs 1). On ads, in-app purchases and device support there is nothing between them.

InterCalc is free to download; Great Circle Tool costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

InterCalc holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: Great Circle Tool has 5 ratings behind it against 1, so its average is the more settled of the two.

InterCalc ships an update every 11 months, Great Circle Tool every 4 days. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | InterCalc | Great Circle Tool |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/intercalc/id498391316/reviews)** | [2.6 (5 ratings)](https://appshunter.io/ios/app/great-circle-tool/id1176844036/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 days** |
| Monetization | **Free** | Paid |
| Size | 1 MB | 11 MB |
| Requires iOS | 18.6 | **9.3** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [River Rock Logic](https://appshunter.io/developer/340225113) | [Learrocket Productions, LLC](https://appshunter.io/developer/1169376314) |

## What reviewers say

### InterCalc

[App page](https://appshunter.io/ios/app/intercalc/id498391316)

This app performs linear interpolation using a set of X-Y values to define a relationship. It can calculate values based on defined points, useful for tasks like converting pressure readings to fluid volumes in containers or performing simple unit conversions.

**Highlights:** Linear interpolation of X-Y values, Defines arbitrary functions from data points, Calculates fluid volume from pressure readings, Performs unit conversions (e.g., temperature, speed), Supports custom data sets

**Features:** macOS Compatibility

**In-app purchases:** none


### Great Circle Tool

[App page](https://appshunter.io/ios/app/great-circle-tool/id1176844036)

Calculate the shortest distance between two points on Earth's surface. Ideal for pilots, it estimates flight times based on aircraft speed. A valuable planning utility for aviation professionals.

**Highlights:** Great circle distance calculation, Airport to airport distance, Flight time estimation, Aircraft speed input, Pilot planning tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is InterCalc free?

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

### Is Great Circle Tool free?

Great Circle Tool costs $2.99, with no in-app purchases.

### Which has better reviews, InterCalc or Great Circle Tool?

InterCalc is rated higher. InterCalc averages 5.0 out of 5 from 1 ratings, while Great Circle Tool averages 2.6 from 5 ratings.

### Do InterCalc or Great Circle Tool have ads?

Neither InterCalc nor Great Circle Tool shows ads.

### Which is updated more often, InterCalc or Great Circle Tool?

InterCalc ships an update every 11 months, and Great Circle Tool every 4 days. Most recently, InterCalc was updated on October 1, 2026 and Great Circle Tool on October 7, 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.*