# Doppler Effect Calculator vs JONAVA

The clearest difference is price: JONAVA at Free against Doppler Effect Calculator's $2.99. JONAVA also leads on update cadence (every 2 months vs every 26 months) and iOS requirement (15.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

JONAVA is free to download; Doppler Effect Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Doppler Effect Calculator ships an update every 26 months, JONAVA every 2 months. The most recent releases landed on October 8, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Doppler Effect Calculator | JONAVA |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/doppler-effect-calculator/id1410084954/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 1 MB | 87 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Jonavos rajono savivaldybė](https://appshunter.io/developer/1653608089) |

## What reviewers say

### Doppler Effect Calculator

[App page](https://appshunter.io/ios/app/doppler-effect-calculator/id1410084954)

This physics and math calculator helps determine the frequency of sound waves when the source or observer is in motion. It provides instant calculations with copyable results and includes reference formulas. The app supports various units and high precision, working seamlessly on iOS devices.

**Highlights:** Instant calculations, Copyable results, Reference formulas included, Supports 16 decimal places, Multiple unit support, Ad-free and private

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

**In-app purchases:** none


### JONAVA

[App page](https://appshunter.io/ios/app/jonava/id6444289331)

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

**In-app purchases:** none


## Frequently asked questions

### Is Doppler Effect Calculator free?

Doppler Effect Calculator costs $2.99, with no in-app purchases.

### Is JONAVA free?

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

### Do Doppler Effect Calculator or JONAVA have ads?

Neither Doppler Effect Calculator nor JONAVA shows ads.

### Which is updated more often, Doppler Effect Calculator or JONAVA?

Doppler Effect Calculator ships an update every 26 months, and JONAVA every 2 months. Most recently, Doppler Effect Calculator was updated on October 8, 2026 and JONAVA on October 10, 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.*