# Spectrolite vs Sound Level & Spectrogram

The clearest difference is in-app purchases: Sound Level & Spectrogram at none against Spectrolite's 1. Sound Level & Spectrogram also leads on review sentiment (100% vs 83%). Spectrolite's advantage is ads (none vs shown) and device support (3 vs 1). On price and update cadence there is nothing between them.

Both are free to download. Spectrolite sells 1 one-off in-app purchase. Sound Level & Spectrogram asks for nothing beyond the download.

Spectrolite ships an update every 8 months, Sound Level & Spectrogram every 5 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Spectrolite | Sound Level & Spectrogram |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (51 ratings)](https://appshunter.io/ios/app/spectrolite/id1480240180/reviews)** | — |
| Number of ratings | **51** | — |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 5 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 1 MB | 4 MB |
| Requires iOS | **15.6** | 18.7 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Waxing Wave](https://appshunter.io/developer/392942046) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### Spectrolite

[App page](https://appshunter.io/ios/app/spectrolite/id1480240180)

This app visualizes sound in real-time using various spectrogram types. Explore detailed audio data with intuitive touch controls and adjustable parameters. An optional purchase unlocks advanced measurement tools.

**Highlights:** Real-time spectrogram visualization, Constant-Q, linear, and mel frequency scales, Full human hearing frequency range, Intuitive touch panning and zooming, Adjustable gain, Q, and other parameters, Pro version: grids, scales, spectrum view, tap-to-measure

**In-app purchases (1)**

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


### Sound Level & Spectrogram

[App page](https://appshunter.io/ios/app/sound-level-and-spectrogram/id6503722682)

Measure sound levels in decibels and visualize sound frequencies with a real-time spectrogram. Understand your environment's noise and protect your health. Offers advanced settings for accurate acoustic analysis.

**Highlights:** Sound level measurement (dB), Real-time spectrogram analysis, Frequency weighting correction (A, C, Z), Time weighting characteristics (Fast, Slow), Time course graph, Environmental noise measurement

**In-app purchases:** none


## Frequently asked questions

### Is Spectrolite free?

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

### Is Sound Level & Spectrogram free?

Sound Level & Spectrogram is free to download, with no in-app purchases.

### Do Spectrolite or Sound Level & Spectrogram have ads?

Sound Level & Spectrogram shows ads; Spectrolite does not.

### Which is updated more often, Spectrolite or Sound Level & Spectrogram?

Spectrolite ships an update every 8 months, and Sound Level & Spectrogram every 5 months. Most recently, Spectrolite was updated on September 23, 2026 and Sound Level & Spectrogram on September 18, 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.*