# Light Spectrometer Wavelength — user reviews > 31 indexed App Store user reviews of Light Spectrometer Wavelength by Contechity AB, rated 4.20/5 from 90 ratings. - Source: https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews - App overview in markdown: https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820.md - Rating breakdown: 5★ 62 · 4★ 10 · 3★ 3 · 2★ 1 · 1★ 14 ## Newest reviews (10 of 31) ### 5/5 — Very good app *2025-07-13* Very good app. Hopefully it can give exact number of the light frequencies in future. **Developer response:** Thanks a lot for your valuable review! If you want, feel free to write directly to me and explain a bit more what functionality you would like to see in the app, apps@contechity.com. Thank you! ### 5/5 — Great *2025-06-25* Really works ! Thank you so much **Developer response:** Thanks a lot for sharing your experience with the app - it is very much appreciated! ### 5/5 — Nice app! *2025-04-25* I am glad I found this app and will use almost daily. **Developer response:** Thanks a lot for taking the time to leave a review! Your support is very appreciated. ### 5/5 — Awesome *2025-02-09* Great tool for measuring light wavelength! **Developer response:** Thank you so much for your review! ### 5/5 — Easy to use free app *2025-01-26* Easy to use spectrometer app without misleading fees. Works seamlessly and perfect for my needs. I haven’t figured out what additional features come with premium paid subscription so I haven’t tried it. But sounds VERY reasonable at $6.99 for lifetime use. Thanks Bjorn! **Developer response:** Thanks a lot for your kind review and 5-star rating! It is very much appreciated! ### 5/5 — Excellent app *2025-01-20* Does exactly what it claims to do. Would like to see more of a spectrum, not just the dominate spectrum. **Developer response:** Thank you for your 5-star review! I agree—it would be amazing if we could capture the full spectrum using just a smartphone camera. However, without a prism or similar device to separate light into its full range of frequencies, it's simply not possible. Thanks again! ### 5/5 — Test on TV monitor *2024-09-23* Was detecting all the colors on screen **Developer response:** Thank you so much for your 5-star review! I'm happy to hear that the app was able to detect all the colors on your TV monitor screen. If you have any questions or suggestions for future improvements, please don't hesitate to reach out to me at apps@contechity.com. I appreciate your support! ### 5/5 — Tested a UV lamp *2024-05-07, version 2.2.0* Tested it against a UV lamp and it detected it accurately. ### 4/5 — Lovely app! *2024-03-09, version 2.1.0* Used in lab experiment to determine some LED wavelengths & then calculate h (Planck constant). App was checked and gave same data for known laser wavelengths so assume calibration was ok for others. Obviously the quality of camera & configuration of experiment will influence reliability of data. One star deducted only because the user interface is not very intuitive! ### 5/5 — Review *2024-01-02* I found this app to be easy to use and would recommend it. The developer was very helpful and responsive to my questions. ## Most critical reviews (10 lowest-rated) ### 1/5 — Warning - automatic payment *2026-06-06, version 3.6.0* App automatically debits your App Store account after a few weeks without even requesting your permission. Even if you’re not using the free version of the app!!! ### 1/5 — Abzocke, Zeitverschwendung *2026-04-24, version 3.5.0* Bei den Suchergebnissen steht kein Preis damit es so aussieht als wäre es kostenlos ### 1/5 — Scam *2025-07-01* Totally a waste of space app is useless wants money to do anything I’ll buy a legitimate meter first. **Developer response:** The app is free to use for a few weeks without signing up - simply tap "Close" on the paywall. If you like it, a subscription or a one-time purchase is required for continued use. Let me know if there are any problems, apps@contechity.com Thank you so much! ### 1/5 — Cant try it before you buy it *2025-04-24* It does not tell you that you have to buy it to try it. It was on for about a minute then I get the old bait and switch. NO Thanks **Developer response:** The app is free to use for a few weeks without signing up - simply click "Close" on the paywall. If you like it, a subscription or a one-time purchase is required for continued use. If you did not have enough time to test the app, please send an email to me at apps@contechity.com so that I can prolong your test period. Thank you so much! ### 1/5 — Abzocke *2025-04-15, version 3.2.0* Nach dem start sofort 8 Euro. Nein danke! ### 1/5 — Not working??? *2025-02-04* For some reason blue comes out to be orange and it cannot correctly find colors of a substance in room light and also where is the rgb?????? **Developer response:** If you want to measure the color of substances (as RGB-values or in other color spaces), please instead use the Color Identifier Colorimeter App. It is made specifically for that and uses reference white to provide the best accuracy. This app is for measuring the dominant wavelength of light, which is different. Welcome to write to me at apps@contechity.com for a full explanation. apps@contechity.com Thank you so much! https://apps.apple.com/us/app/id6449255688 ### 1/5 — Pay To Try Only *2024-10-08* Seems that this has no trial / demo. You must pay to see if it works for your application or need. **Developer response:** Oh, you shall absolutely be able to try out the app for a few weeks for free! Please send me an email and I will open up the app for you! Sorry for this trouble! apps@contechity.com ### 1/5 — Terrible *2024-09-23* I got it and it said anything from purple to green was the same color. If I shined a light to get difference, it wouldn’t work. **Developer response:** I'm sorry to hear you had trouble with the app. It does indeed sound like something is completely wrong. I'd be happy to figure out want went wrong and of course give you a refund if you paid anything. Please email me at apps@contechity.com. Thank you so much for your feedback! ### 3/5 — White saturation calibration *2024-07-09, version 2.3.0* This app works well when directed to block colours, but I have failed to get it calibrated with the initial ‘white’ surface to get it going correctly. I tried pointing my phone camera at a sheet of white paper, a white wall both inside and also outside in natural light, but I still get the very same message on the screen that saturation is low and so accuracy will be low. I found that disappointing. ### 4/5 — Excellent science class tool! *2025-06-08* Can do some pretty amazing studies. Wish Inhad a fixture to take pics on my phone! **Developer response:** Thanks a lot for sharing your experinence of the app! Would you please send an email to apps@contechity.com, so that I can understand the feature you are asking for, better. Thanks a lot! ## Most praised reviews (10 highest-rated) ### 5/5 — Thank you! *2026-05-30* This is a great tool … it’s spot on … I use it to see if the product actually is what they say it is with regards to light therapy. Love it!! **Developer response:** Thank you so much for the kind words! Really glad the app is proving useful for verifying light therapy products and that the app is spot on! Reviews like yours mean a lot to me as a solo developer. Happy measuring! ☀️ ### 5/5 — 𝓑 *2025-12-28, version 3.4.1* 𝓑 ### 5/5 — Impressive *2025-12-24* Very good **Developer response:** Thank you so much for your support! ### 5/5 — Free *2025-12-20, version 3.3.0* And brilliant ### 5/5 — Handy, useful tool *2025-11-17* Useful tool to get approximate frequency of colored lights in nm **Developer response:** Thanks a lot for your review! ### 5/5 — seems pretty good *2025-10-26, version 3.3.0* ✌️ ### 5/5 — Great little app! *2025-09-18, version 3.2.1* Very handy for demonstrating, or determining, the wavelength of a given colour and so easy to use. Would be ideal for use in the classroom and a lot cheaper than spectrometer! Also, I contacted Björn with a technical question and he was extremely helpful and prompt in his replies. Great guy! ### 5/5 — works *2025-09-17, version 3.2.1* cool ### 5/5 — Light Spectrometer *2025-08-17* Love this thing **Developer response:** Thanks a lot for your kind review! ### 5/5 — Red light therapy *2025-08-06* Great app for testing wavelength for red light therapy **Developer response:** Thank you so much for sharing your experience of the app! --- *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 2026-08-26.*