# Fluorescence SpectraViewer vs Thorlabs Toolkit

The clearest difference is iOS requirement: Fluorescence SpectraViewer at 9.0 against Thorlabs Toolkit's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Fluorescence SpectraViewer | Thorlabs Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (11 ratings)](https://appshunter.io/ios/app/fluorescence-spectraviewer/id421031826/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | — |
| Size | 9 MB | 30 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thermo Fisher Scientific](https://appshunter.io/developer/407517076) | [Thorlabs, Inc.](https://appshunter.io/developer/1725147057) |

## What reviewers say

### Fluorescence SpectraViewer

[App page](https://appshunter.io/ios/app/fluorescence-spectraviewer/id421031826)

This app allows users to plot and compare fluorescent spectra, check spectral compatibility for various fluorophores, and email configurations. It serves as a mobile extension of an online tool for biological applications.

**Highlights:** Plot and compare fluorescent spectra, Check spectral compatibility, Add emission and excitation filters, Email configurations and figures, Search extensive fluorophore list, Mobile-friendly interface

**Features:** Vision Pro support

**In-app purchases:** none


### Thorlabs Toolkit

[App page](https://appshunter.io/ios/app/thorlabs-toolkit/id6475776756)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fluorescence SpectraViewer free?

Fluorescence SpectraViewer is free to download, with no in-app purchases.

### Is Thorlabs Toolkit free?

Thorlabs Toolkit is free to download, with no in-app purchases.

### Do Fluorescence SpectraViewer or Thorlabs Toolkit have ads?

Neither Fluorescence SpectraViewer nor Thorlabs Toolkit shows ads.

### Which is updated more often, Fluorescence SpectraViewer or Thorlabs Toolkit?

Fluorescence SpectraViewer ships an update every 4 months, and Thorlabs Toolkit every 4 months. Most recently, Fluorescence SpectraViewer was updated on October 29, 2026 and Thorlabs Toolkit on October 25, 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.*