# InterCalc vs Tied2Shore

The clearest difference is update cadence: Tied2Shore at every 8 days against InterCalc's every 11 months. Tied2Shore also leads on ratings volume (4 vs 1) and iOS requirement (15.0 vs 18.6). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for InterCalc against 5.0 for Tied2Shore. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

InterCalc ships an update every 11 months, Tied2Shore every 8 days. Both last shipped on October 1, 2026.

## The numbers

| Metric | InterCalc | Tied2Shore |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/intercalc/id498391316/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/tied2shore/id6744415965/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 8 days** |
| Monetization | Free | Free |
| Size | 1 MB | 80 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [River Rock Logic](https://appshunter.io/developer/340225113) | [Global Maritime Ministries](https://appshunter.io/developer/1807610498) |

## 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


### Tied2Shore

[App page](https://appshunter.io/ios/app/tied2shore/id6744415965)

This app provides seafarers with essential resources and support, whether at sea or in port. It offers an offline database of seafarer centers worldwide and an interactive global map for easy access to facilities.

**Highlights:** Offline seafarer center database, Interactive global map of centers, Offline library of seafarer resources, Resources tailored for maritime journeys, Spiritual encouragement and practical tools

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

**In-app purchases:** none


## Frequently asked questions

### Is InterCalc free?

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

### Is Tied2Shore free?

Tied2Shore is free to download, with no in-app purchases.

### Which has better reviews, InterCalc or Tied2Shore?

InterCalc and Tied2Shore are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.

### Do InterCalc or Tied2Shore have ads?

Neither InterCalc nor Tied2Shore shows ads.

### Which is updated more often, InterCalc or Tied2Shore?

InterCalc ships an update every 11 months, and Tied2Shore every 8 days. Most recently, InterCalc was updated on October 1, 2026 and Tied2Shore on October 1, 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.*