- Sad to see it's an Electron app, but I don't want to start this flamewar all over again
- Mid-sized CSV file opens fairly quick
- If you want to build this into a full-fledged app, be prepared to handle a lot of CSV edge cases, also think about supporting AVRO, Parquet files
- Regarding filtering: I can filter on CONTAINS and '=' but not on NOT-CONTAINS or '<>' I think? This is annoying to filter out empty strings (didn't check in much detail so I might be wrong here)
- Regarding filtering: I have a lot of columns, would be nice if the dropdown would allow me typing some characters to prune the list and quickly find what I'm looking for
- You might think about including some statistics per column, e.g. variance or entropy to allow for exploration in case many columns are present and you quickly want to highlight the more "interesting" ones
Congrats on putting something out! Some competition in this space: https://exploratory.io/, https://github.com/saulpw/visidata and http://www.delimitware.com/ (as others have mentioned).