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Clac vs bc: catalog facts
Clac	bc
Free Free and open source under the BSD-2-Clause license.	Free Free and open source under the BSD 2-Clause license.
Command line	Windows, macOS, Linux, Command line
Shows stack changes as you type Uses postfix notation without operator precedence	Implements POSIX bc with GNU extensions Includes dc functionality
Uses stack-based postfix notation rather than conventional calculator input	Uses a command-line interface
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause	License: BSD-2-Clause
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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