# ブルーライトチェッカー：ブルーライトを可視化 > Visualize and quantify the blue light using your smartphone. Canonical page: [https://chrome-stats.com/d/jp.co404.blchecker](https://chrome-stats.com/d/jp.co404.blchecker) ## Overview - **ID:** `jp.co404.blchecker` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** 404Ltd. - **Category:** HEALTH\_AND\_FITNESS - **Downloads:** 1,149 - **Version:** 1.2 - **Last updated:** 2023-09-22 - **First published:** 2021-12-21 - **Publisher country:** JP - **Size:** 20 MB - **Data as of:** 2026-09-14 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=jp.co404.blchecker) - **Website:** [https://404.co.jp](https://404.co.jp/) - **Privacy policy:** [https://404.co.jp/privacy.html](https://404.co.jp/privacy.html) ## Description This application measures the color corresponding to the blue light wavelength based on the "CIE color measurement standard observer equal color function" established by CIE (International International Lighting Committee).

"Blue Light Checker" is an application that visualizes the blue light rate on your computer or smartphone screen.

Until now, I had no choice but to believe the product word "cutting blue light".

From now on, it will be possible to visualize how much blue light cut products can cut blue light.

By scanning the inside of the room, you can investigate the equipment that emits blue light, how much the dark mode of the smartphone can cut the blue light, and how much it changes by adjusting the brightness of the computer or TV screen. It's obvious at a glance.

In the first place, we also have learning content for those who are "what is blue light?" And "what is the problem with blue light?"

With the spread of telework, the time spent in contact with smartphones and personal computers is inevitably prolonged, and the rhythm of life tends to be disturbed.

If you can't sleep at night and can't get up in the morning, if you can't get tired even if you sleep, or if you are suffering from eye strain, please try it.

○ About application function
・ Visualize blue light
Just by taking a picture of your computer or smartphone screen using the back camera of your smartphone, the light corresponding to the blue light will be displayed in color.

○ Reliability of blue light measurement
This application uses the "CIE Color Measurement Standard Observer Color Function" established by the CIE (International International Lighting Committee) to measure colors corresponding to the blue light wavelength.

○ Notes
This service is a simple diagnosis application for blue light.
It is not a substitute for a diagnosis at a medical institution and does not make a definitive diagnosis.
We recommend that you visit a medical institution if necessary.

○ Inquiries
If you have any questions, comments, or inquiries, please contact us from the email address below.
info@404.co.jp ## Rankings - #1,114,551 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.CAMERA` - `android.permission.FOREGROUND_SERVICE` - `android.permission.INTERNET` - `android.permission.READ_EXTERNAL_STORAGE` - `android.permission.RECEIVE_BOOT_COMPLETED` - `android.permission.WAKE_LOCK` - `android.permission.WRITE_EXTERNAL_STORAGE` - `com.google.android.gms.permission.AD_ID` ## Similar extensions and apps - [Bluelight blocking](https://chrome-stats.com/d/com.bluelight.Smart) — 369,360 users, 4.16 / 5 - [GMBLUE](https://chrome-stats.com/d/com.viewitech.gmblue) — 29 users - [Bluespec BLE](https://chrome-stats.com/d/com.viewitech.bluespecble) — 435 users - [ブルーライトプロテクト プラス](https://chrome-stats.com/d/jp.kazupinklady.bluelightprotectplus) — 1,706 users - [Blue Light](https://chrome-stats.com/d/com.lights.bluelight) — 557,508 users, 3.87 / 5 - [ブルーライトプロテクトスイッチ](https://chrome-stats.com/d/jp.kazupinklady.bluelightprotectswitch) — 851 users - [Bluelight Filter Lite](https://chrome-stats.com/d/com.hardyinfinity.bluelightfilter.lite) — 279,091 users, 4.31 / 5 - [JBlueCut - Screen filter](https://chrome-stats.com/d/com.jintin.jbluecut.free) — 117,587 users, 4.65 / 5 - [Blue Light Protect](https://chrome-stats.com/d/jp.kazupinklady.bluelightprotect) — 193,913 users, 4.20 / 5 - [Blue Light Filter-protect eyes](https://chrome-stats.com/d/com.posko777.bluelight) — 90,104 users, 4.57 / 5 - [BluSee - Blue light Filter](https://chrome-stats.com/d/com.hadafengineering.bluelightfilter) — 31,146 users, 3.00 / 5 - [Blue Light Screen](https://chrome-stats.com/d/appinventor.ai_dtproductionsapp.Blue_Light_Screen) — 27 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/jp.co404.blchecker)