# OSpectrometer vs Sleep Friendly

The clearest difference is iOS requirement: OSpectrometer at 15.1 against Sleep Friendly's 26.0. On price, ads, in-app purchases 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 and Sleep Friendly sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | OSpectrometer | Sleep Friendly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (4 ratings)](https://appshunter.io/ios/app/ospectrometer/id6446124449/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 71 MB | 58 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NANO ELECTRONICS RESEARCH MUHENDISLIK ARASTIRMA GELISTIRME LIMITED SIRKETI](https://appshunter.io/developer/1674573382) | [James Nerlinger](https://appshunter.io/developer/1808226067) |

## What reviewers say

### 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 |


### Sleep Friendly

[App page](https://appshunter.io/ios/app/sleep-friendly/id6764074297)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sleep Friendly Pro | $0.99 | one-time |


## Frequently asked questions

### Is OSpectrometer free?

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

### Is Sleep Friendly free?

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

### Do OSpectrometer or Sleep Friendly have ads?

Neither OSpectrometer nor Sleep Friendly shows ads.

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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.*