Features

Extension

• Built in caption editor accessible directly from supported video sharing sites

• Caption file loading (SRT, VTT, SBV, SSA, ASS, TXT supported)
• Caption upload
• Caption viewing
• Advanced Substation Alpha (SSA/ASS) caption rendering
• Caption rating system

Website

• Captioned video search
• Captioner profiles
• Caption review page
• Captioner moderation tools (verify, reject)

Supported sites

• YouTube
• Vimeo
• bilibili
• niconico
• TVer
• Netflix (editor disabled)

Setup for local development

Tested build environment

1. Node 22.14.0
2. Windows 10

Steps

1. Run npm ci
2. Copy the contents of .env.sample to .env and fill in the details.

1. Run npm run watch to start the webpack dev server for both the extension

1. Go to chrome://extensions in Chrome and load the unpacked extension from

1. Go to http://localhost:12341 to access the NekoCap website

Adding fonts to be hosted from the NekoCap site for SSA/ASS rendering

1. Create a folder called fonts in the public folder.
2. Add woff2 webfonts that you want to serve from the website into that folder
3. Modify src/common/substation-fonts.ts to assign font names to the

1. Run npm run fontlist to generate the public/fontlist.json file that will

Creating a production build

1. Copy the contents of .env.sample to .env.prod and fill in the details.

1. Run npm run build to build both the extension and the website

1. The output will be in .next/ and dist/extension

Creating a Firefox extension build

1. Copy the contents of .env.sample to .env.prod and fill in the details.

1. Run npm run build to build both the extension and the website

1. The output will be dist/extension

If you want to build the NekoCap website Docker image