# RFCReader Pro vs OSpectrometer

The clearest difference is review sentiment: RFCReader Pro at 63% against OSpectrometer's 0%. RFCReader Pro also leads on in-app purchases (none vs 2). OSpectrometer's advantage is price (Free vs $1.99) and update cadence (every 2 weeks vs every 3 months). On ads and device support there is nothing between them.

OSpectrometer is free to download; RFCReader Pro costs $1.99 up front. OSpectrometer sells 2 in-app purchases, starting at $2.99 per month. RFCReader Pro asks for nothing beyond the download.

RFCReader Pro ships an update every 3 months, OSpectrometer every 2 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RFCReader Pro | OSpectrometer |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[2.0 (4 ratings)](https://appshunter.io/ios/app/ospectrometer/id6446124449/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | **62.5% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 3 MB | 71 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [飞 龙](https://appshunter.io/developer/965611281) | [NANO ELECTRONICS RESEARCH MUHENDISLIK ARASTIRMA GELISTIRME LIMITED SIRKETI](https://appshunter.io/developer/1674573382) |

## What reviewers say

### RFCReader Pro

[App page](https://appshunter.io/ios/app/rfcreader-pro/id1036461920)

Access and read technical documents for the Internet, including searching, bookmarking, and offline viewing. Customize text formatting, navigate easily, and save changes. Supports multiple formats like PDF and HTML.

**Highlights:** List all RFC documents, Search RFC by keywords or number, Offline RFC reading, Text formatting and styling, Navigate with Table of Contents, Read in PDF and HTML formats, Save changes to documents

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**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 RFCReader Pro free?

RFCReader Pro costs $1.99, with no in-app purchases.

### Is OSpectrometer free?

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

### Do RFCReader Pro or OSpectrometer have ads?

Neither RFCReader Pro nor OSpectrometer shows ads.

### Which is updated more often, RFCReader Pro or OSpectrometer?

RFCReader Pro ships an update every 3 months, and OSpectrometer every 2 weeks. Most recently, RFCReader Pro was updated on November 6, 2026 and OSpectrometer 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.*