# Engineering Calculator vs Speaker Booster

The clearest difference is rating: Speaker Booster at 5.0 against Engineering Calculator's 4.5. Speaker Booster also leads on ads (none vs shown) and update cadence (fortnightly vs monthly). Engineering Calculator's advantage is monetization model (ad-supported vs freemium) and iOS requirement (12.2 vs 15.0). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Speaker Booster holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Engineering Calculator ships an update monthly, Speaker Booster fortnightly. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Engineering Calculator | Speaker Booster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/engineering-calculator/id1395510375/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/speaker-booster-ampcrank/id6793427937/reviews)** |
| Number of ratings | 2 | 2 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Ad-supported** | Freemium |
| Size | 1 MB | 14 MB |
| Requires iOS | **12.2** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masato Kanazawa](https://appshunter.io/developer/1110570349) | [明航 李](https://appshunter.io/developer/1823569127) |

## What reviewers say

### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id1395510375)

This utility app helps users convert units and calculate tips, primarily for those in the US. It operates offline and aims for minimal user interaction to provide quick results. Useful for avoiding misunderstandings in business dealings due to unit differences.

**Highlights:** Unit conversion, Tip calculation, Offline functionality, Minimalist interface, Business negotiation aid

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

**In-app purchases:** none


### Speaker Booster

[App page](https://appshunter.io/ios/app/speaker-booster-ampcrank/id6793427937)

Enhance the volume and clarity of your imported audio files, including music, podcasts, and recordings. Features a powerful equalizer with presets for different audio types and a digital gain of up to +24 dB. Enjoy background playback with lock screen controls.

**Highlights:** Volume boost up to +24 dB, Built-in limiter for distortion-free audio, Live level meter and spectrum animation, Vocal, Bass, and Podcast EQ presets, 10-band manual equalizer with custom presets, Import MP3, WAV, M4A, FLAC, AAC, Extract audio from MP4 videos, Background playback with lock screen controls

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

**In-app purchases:** none


## Frequently asked questions

### Is Engineering Calculator free?

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

### Is Speaker Booster free?

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

### Which has better reviews, Engineering Calculator or Speaker Booster?

Speaker Booster is rated higher. Engineering Calculator averages 4.5 out of 5 from 2 ratings, while Speaker Booster averages 5.0 from 2 ratings.

### Do Engineering Calculator or Speaker Booster have ads?

Engineering Calculator shows ads; Speaker Booster does not.

### Which is updated more often, Engineering Calculator or Speaker Booster?

Engineering Calculator ships an update monthly, and Speaker Booster fortnightly. Most recently, Engineering Calculator was updated on October 9, 2026 and Speaker Booster on October 24, 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.*