SplenSheet is a free online spreadsheet editor. You can drag and drop any spreadsheet files, including Excel files, CSV files, and more. The app runs entirely in your browser, so you can view and edit your spreadsheets without uploading them to a server.
SplenPlayer is a very simple media player with the caption/subtitle feature. It supports various caption formats such as VTT, SRT, and SAMI.
For audio files, it will display the beautiful visualizer.
