# Blume LED vs OSpectrometer

The clearest difference is review sentiment: Blume LED at 100% against OSpectrometer's 0%. Blume LED also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 2). OSpectrometer's advantage is update cadence (every 2 weeks vs every 107 months) and ratings volume (4 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. OSpectrometer sells 2 in-app purchases, starting at $2.99 per month. Blume LED asks for nothing beyond the download.

Blume LED holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively. Written reviews point the same way: 100% of Blume LED's written reviews are positive against 0% of OSpectrometer's.

Blume LED ships an update every 107 months, OSpectrometer every 2 weeks. The most recent releases landed on September 29, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Blume LED | OSpectrometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/blume-led/id1288248844/reviews)** | [2.0 (4 ratings)](https://appshunter.io/ios/app/ospectrometer/id6446124449/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 107 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 18 MB | 71 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Grant Patterson](https://appshunter.io/developer/587947101) | [NANO ELECTRONICS RESEARCH MUHENDISLIK ARASTIRMA GELISTIRME LIMITED SIRKETI](https://appshunter.io/developer/1674573382) |

## What reviewers say

### Blume LED

[App page](https://appshunter.io/ios/app/blume-led/id1288248844)

Control LEDs connected to a Bluetooth-enabled Arduino clone with your smartphone or tablet. This platform enables custom LED projects using a cross-platform app.

**Highlights:** Bluetooth LED control, Arduino project platform, Cross-platform app, Smartphone/tablet integration, Customizable LED projects

**Features:** macOS Compatibility

**In-app purchases:** none


### OSpectrometer

[App page](https://appshunter.io/ios/app/ospectrometer/id6446124449)

This app uses your device's camera and screen to perform basic optical spectroscopy. Analyze the visible light spectrum of objects, map light wavelengths to RGB values, and save or share your findings. It functions offline without external hardware.

**Highlights:** Visible light spectrum analysis, RGB color value mapping, Wavelength selection and scanning, Front camera reflection sensing, Save and share results, Offline functionality

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| month | $2.99 | per month |
| year | $9.99 | per year |


## Frequently asked questions

### Is Blume LED free?

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

### Is OSpectrometer free?

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

### Which has better reviews, Blume LED or OSpectrometer?

Blume LED is rated higher. Blume LED averages 5.0 out of 5 from 1 ratings, while OSpectrometer averages 2.0 from 4 ratings.

### Do Blume LED or OSpectrometer have ads?

Neither Blume LED nor OSpectrometer shows ads.

### Which is updated more often, Blume LED or OSpectrometer?

Blume LED ships an update every 107 months, and OSpectrometer every 2 weeks. Most recently, Blume LED was updated on September 29, 2026 and OSpectrometer on October 15, 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.*