# SpectralViewer, spectraView — Spectral graph plot

> Mobile app for spectral intensity measurement and analysis using device camera. (iPhone/iPad app by Junichi Watanabe.)

- Source: https://appshunter.io/ios/app/spectralviewer-spectraview/id1201249094 (this page in markdown: same URL + `.md`)
- Developer: [Junichi Watanabe](https://appshunter.io/developer/1014493824)
- Category: Education, Photo & Video
- Price: Free
- Rating: 3.80/5 from 4 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.2 · 13 MB
- Languages: American English
- Released: 2017-02-07
- Data updated: 2026-06-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/spectralviewer-spectraview/id1201249094/reviews.md

## What is SpectralViewer, spectraView?

By using iPhone or iPad camera, you can measure a spectral intensity of the light by a spectrum image from a spectrometer.

Press camera > photo button to shoot a spectrum image dispersed by the spectrometer.  If reflected light is observed, please be the in the area of ​​the dark rectangle on the upper side of the camera screen. For iPadOS 13, open the Control Center and then tap the "Lock Orientation" button to avoid rotating the spectrum capture area.

Press the graph button to show the light intensity distribution of the spectrum calculated by the camera image. The values ​​of R, G and B are respectively calculated as the average value of the central quarter width of the spectral image. Adjust the intensity of the input light by, for example, narrowing the slit so that each color does not exceed the maximum value 255. The value of R+G+B is also plotted in black. You can change the plot scale of spectral intensity by ＜＞ button.

By pressing the plot button, sliding the upper spectral image to the left and right, and entering two points with known wavelengths, you can plot the wavelength scale. If the R0 wavelength is set as reflected light (0 nm) and the R1 wavelength is set only for the first time, the wavelength scale is plotted only by setting the R0 wavelength after the second time. You can save the plot with wavelength scale as image. For the data to be stored, a filter was applied so as to smoothly connect the intensity curves of the sensitivity wavelength regions of R, G and B colors.

Because it is very dangerous, please never see strong light such as the sun, and please do not put it in the iPhone's camera.

## Key features

- Measure spectral intensity with device camera
- Analyze spectrum images
- Plot light intensity distribution
- Calibrate wavelength scales
- Save spectral plots as images
- Adjust plot scale

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/spectralviewer-spectraview/id1201249094/reviews.md

### 5/5 — とても良い

*2023-04-23, version 1.5*

こんなアプリがちょうど欲しかったところだったのでとても助かりました
ただ、使い方の動画を見てもイマイチわかりません。
教えていただけると幸いです。
アプリ自体はとても良かったので星５をつけさせていただきました。

### 3/5 — led

*2020-09-06, version 1.5*

このアプリでiPhoneを使って植物育成用LEDのLEDの波長を計測できますか？

### 5/5 — なかなか使えそう

*2019-10-22, version 1.4*

分光分析器みたいに、光の成分を分析できます。
なかなか、使えそうです。
類似アプリが無いだけに、貴重です。

### 5/5 — アップデートしていただければ★5です。

*2019-08-16, version 1.4*

iPhoneXSでは対応していませんが、有用です。
教育に活用できるので、アップデートしていただけると幸いです。

【追伸】
対応して頂き、ありがとうございます。
とても使えるアプリです！

### 5/5 — Efficient Carbon Quantum Dot Emission Analysis

*2018-07-23*

This app is capable of efficient analysis of quantum dots emitting in the visible spectrum and near-UV. Using a DIY iPhone case glued to a spectroscope this spectra analysis tool costs about $10. There is no raw data output (but please add this feature!). The graphs are comprehensive and easy to use and the app is intuitive and stable. Overall the best spectroscope app for basic and general analysis, with the addition of raw CSV data or something, this can be a very powerful and efficient scientific tool. Cheers!

### 2/5 — Interesting - has promise - not intuitive

*2017-07-23*

I would very much like to use this but there are no instructions. Even something on your app page would make this much much better.

## Frequently asked questions about SpectralViewer, spectraView

### What is SpectralViewer used for?

SpectralViewer allows you to measure the spectral intensity of light using your iPhone or iPad camera and a spectrometer. You can analyze spectrum images, plot light intensity distribution, and calibrate wavelength scales.

### How do I capture a spectrum image with SpectralViewer?

Press the camera > photo button to shoot a spectrum image dispersed by the spectrometer. Ensure you are in the area of the dark rectangle on the upper side of the camera screen when observing reflected light.

### How can I plot the wavelength scale in SpectralViewer?

By pressing the plot button, you can slide the upper spectral image and enter two points with known wavelengths to plot the wavelength scale. After the first-time setup, you only need to set the R0 wavelength.

### Can I save my spectral data with SpectralViewer?

Yes, you can save the plot with the wavelength scale as an image. The data is stored after a filter is applied to smoothly connect the intensity curves of the R, G, and B color sensitivity wavelength regions.

### What is the age rating for SpectralViewer?

SpectralViewer has an age rating of 4+, making it suitable for a wide range of users. However, users should be cautioned against looking at strong light sources like the sun.

### What devices does SpectralViewer support?

SpectralViewer is supported on iPhone, iPad, and iPod devices. It requires iPadOS 13 or later for certain orientation lock features.

### How often is SpectralViewer updated?

The latest version of SpectralViewer is 1.5, which was last updated on July 30, 2020. It was initially released on February 7, 2017.

### Does SpectralViewer have ads?

No, SpectralViewer does not contain advertisements. It is a free application without any ad interruptions.

## Version history (last 5 releases)

### 1.5 — 2020-07-30

Fixed a bug that the app does not launch on iPadOS 13.
For iPadOS 13, you can stop the rotation of the spectrum capture area, by enabling the "Lock Orientation" button in the Control Center.
Since no function has been added, there is no need to update if the app is working properly.

### 1.4 — 2019-05-03

Now available on iPad.
Press the support button to display instructions and usage.

### 1.3 — 2019-04-25

Compatible with iPhone X.

### 1.2 — 2017-03-01

You can change the plot scale of spectral intensity.
You can plot the wavelength scale by inputting two known wavelength points.
If the R0 wavelength is set as reflected light (0 nm) and the R1 wavelength is set only for the first time, the wavelength scale can be plotted by setting only the R0 wavelength after the second time.
You can save a plot with wavelength scale as an image.

### 1.1 — 2017-02-11

The values ​​of R, G and B are respectively calculated as the average value of the central quarter width of the spectral image.
Plots of R, G, B are added.

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## More apps by Junichi Watanabe

- [WatchAfication, TimeSignal app](https://appshunter.io/ios/app/watchafication-timesignal-app/id1014493825)
- [ResoSearch, Acoustic resonance &spectrum measuring](https://appshunter.io/ios/app/resosearch-acoustic-resonance-and-spectrum-measuring/id1217332479)
- [PropaRuler, Measurement of radio wave propagation](https://appshunter.io/ios/app/proparuler-measurement-of-radio-wave-propagation/id1229894901)
- [SoundPRuler, measurment of sound wave propagation](https://appshunter.io/ios/app/soundpruler-measurment-of-sound-wave-propagation/id1242740751)
- [LastStone CurlingShotSimulator](https://appshunter.io/ios/app/laststone-curlingshotsimulator/id1355957853)

All apps by Junichi Watanabe: https://appshunter.io/developer/1014493824

## Related topics

[fluorescence spectraviewer](https://appshunter.io/ios/topics/fluorescence-spectraviewer) · [spectral vision](https://appshunter.io/ios/topics/spectral-vision) · [spectral eye](https://appshunter.io/ios/topics/spectral-eye) · [bleach resonance](https://appshunter.io/ios/topics/bleach-resonance) · [light spectrometer wavelength](https://appshunter.io/ios/topics/light-spectrometer-wavelength)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*