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Claper vs Slido: catalog facts
Claper	Slido
Free Open source under AGPL-3.0 and free to self-host.	Freemium A free plan is available, with paid plans for more features.
Web, Self-hosted	Web
Live polls and audience questions during a talk Participants join from their own devices	Anonymous questions with upvoting Polls, quizzes, surveys and word clouds in one tool
Self-hosting requires running an Elixir application Research does not detail hosted plans or pricing	Hosted service that needs an internet connection Participant data is stored on the provider's servers
Self-hosted	Web application, Hosted service
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.