Compare software

Clac vs calc: catalog facts
Clac	calc
Free Free and open source under the BSD-2-Clause license.	Free Free and open source under the LGPL-2.1-or-later license.
Command line	Command line
Shows stack changes as you type Uses postfix notation without operator precedence	Handles arbitrary-precision numbers Works interactively or from a command-line expression
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: LGPL-2.1-or-later
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.