# True vs ETA Calculator

The clearest difference is price: True at Free against ETA Calculator's $0.99. ETA Calculator's advantage is in-app purchases (none vs 1) and update cadence (every 12 months vs every 41 months). On ads, device support and iOS requirement there is nothing between them.

True is free to download; ETA Calculator costs $0.99 up front. True sells 1 one-off in-app purchase. ETA Calculator asks for nothing beyond the download.

True ships an update every 41 months, ETA Calculator every 12 months. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | True | ETA Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 12 months** |
| Monetization | Paid | — |
| Size | 1 MB | 21 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nejc Landeker](https://appshunter.io/developer/712909616) | [Stanislav Soroka](https://appshunter.io/developer/1701402639) |

## What reviewers say

### True

[App page](https://appshunter.io/ios/app/true-wind-calculator/id712909613)

Calculate true wind direction and speed for sailing. Input vessel speed, apparent wind, and angle to determine accurate wind data.

**Highlights:** True-wind calculation, Vessel speed input, Apparent wind speed input, Apparent wind angle input, Vessel heading input

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $4.99 | one-time |


### ETA Calculator

[App page](https://appshunter.io/ios/app/eta-calculator/id6747178906)

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

**In-app purchases:** none


## Frequently asked questions

### Is True free?

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

### Is ETA Calculator free?

ETA Calculator costs $0.99, with no in-app purchases.

### Do True or ETA Calculator have ads?

Neither True nor ETA Calculator shows ads.

### Which is updated more often, True or ETA Calculator?

True ships an update every 41 months, and ETA Calculator every 12 months. Most recently, True was updated on October 25, 2026 and ETA Calculator on October 30, 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.*