# Spectrolite vs UU

The clearest difference is price: Spectrolite at Free against UU's $0.99. Spectrolite also leads on ratings volume (66 vs 2) and update cadence (every 8 months vs every 21 months). UU's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.7). On ads, device support and iOS requirement there is nothing between them.

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

UU holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Spectrolite has 66 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 83% of Spectrolite's written reviews are positive against 100% of UU's.

Spectrolite ships an update every 8 months, UU every 21 months. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Spectrolite | UU |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.7 (66 ratings)](https://appshunter.io/ios/app/spectrolite/id1480240180/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/uu-uuid-generator/id1614731646/reviews)** |
| Number of ratings | **66** | 2 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 21 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 1 MB | 7 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Waxing Wave](https://appshunter.io/developer/392942046) | [JP McGlone LLC](https://appshunter.io/developer/850098774) |

## 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

**Features:** Vision Pro support

**In-app purchases (1)**

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


### UU

[App page](https://appshunter.io/ios/app/uu-uuid-generator/id1614731646)

Easily create unique identifiers for your projects. This tool generates UUIDs on demand and can automatically copy them to your clipboard. It also features on-the-fly QR code generation and supports dark mode for a comfortable user experience.

**Highlights:** Generate UUID, Auto-generate on launch, Auto-copy to clipboard, Generate QR code, Dark Mode support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Spectrolite free?

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

### Is UU free?

UU costs $0.99, with no in-app purchases.

### Which has better reviews, Spectrolite or UU?

UU is rated higher. Spectrolite averages 4.7 out of 5 from 66 ratings, while UU averages 5.0 from 2 ratings.

### Do Spectrolite or UU have ads?

Neither Spectrolite nor UU shows ads.

### Which is updated more often, Spectrolite or UU?

Spectrolite ships an update every 8 months, and UU every 21 months. Most recently, Spectrolite was updated on November 11, 2026 and UU on November 3, 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.*