Blume LED vs OSpectrometer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Blume LED
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.
- Bluetooth LED control
- Arduino project platform
- Cross-platform app
- Smartphone/tablet integration
- Customizable LED projects
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Blume is a platform for LED projects. It combines Bluno Beetle by DFRobot, a cheap bluetooth-enabled Arduino clone, with a cross-platform Cordova app. This app lets you control LEDs connected to the Beetle with any smartphone or tablet.
OSpectrometer
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.
- Visible light spectrum analysis
- RGB color value mapping
- Wavelength selection and scanning
- Front camera reflection sensing
- Save and share results
- Offline functionality
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Optical spectroscopy in the visible light spectrum is a commonly used tool in different fields such as health, manufacturing, art, and forensic research. OSpectrometer implements basic spectrometer functions using the built-in camera and screen without requiring external devices or programs. - Visible light spectrum is transformed and mapped to a function that generates RGB (Red Green Blue) color values - A specific light wavelength can be selected and used to illuminate a desired target (i.e., close to the screen) - The whole spectrum or a specific part of the spectrum can be selected and scanned - Front camera is used to sense the reflection from the target object - Consistent and repeatable reflection/absorption amplitude with respect to the color spectrum - The result can be saved and shared - Works offline, no need to connect to any network or internet Privacy-policy: https://software.nanorescenter.com/osprectrometer-privacy-policy Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Blume LED | OSpectrometer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 2.0 (4 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 1 | 4 — better |
| Update frequency | Every 107 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 18 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Grant Patterson | NANO ELECTRONICS RESEARCH MUHENDISLIK ARASTIRMA GELISTIRME LIMITED SIRKETI |
Customer experience
Blume LED
OSpectrometer
In-app purchases
Blume LED
No in-app purchases
OSpectrometer
- month3 Days trial$2.991 Month
- year3 Days trial$9.991 Year









