# Doppler Effect Calculator vs HA LiveKit

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

HA LiveKit 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, HA LiveKit weekly. The most recent releases landed on October 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Doppler Effect Calculator | HA LiveKit |
| --- | --- | --- |
| 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 | **Weekly** |
| Monetization | Paid | — |
| Size | 1 MB | 7 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Efe Erim](https://appshunter.io/developer/1896654980) |

## 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


### HA LiveKit

[App page](https://appshunter.io/ios/app/ha-livekit/id6769399254)

**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 HA LiveKit free?

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

### Do Doppler Effect Calculator or HA LiveKit have ads?

Neither Doppler Effect Calculator nor HA LiveKit shows ads.

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

Doppler Effect Calculator ships an update every 26 months, and HA LiveKit weekly. Most recently, Doppler Effect Calculator was updated on October 8, 2026 and HA LiveKit on October 31, 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.*