EtherCalc is a self-hosted, real-time collaborative spreadsheet, effectively an open-source counterpart to Google Sheets for shared numbers. Several people can edit the same sheet at once and see every change instantly. Running your own instance keeps the data off other companies' servers. It is open source and still receiving updates, including a recent 2026 rewrite of the codebase. Choose it if you need quick collaborative spreadsheets on infrastructure you control.
EtherCalc
Self-hosted real-time spreadsheet for shared figures.
ethercalc.netFreeOpen SourceWebSelf-hosted
PricingFree and open source; your only cost is the server you self-host it on.
Strengths
- Self-hosted collaborative spreadsheet
- Instant multi-user editing
- Open source and lightweight
- No account required to start
Considerations
- Spreadsheets only, not a full suite
- No encryption so the host can read the data
Listed inOffice Tools
