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pdd vs bttf: catalog facts
pdd	bttf
Free Free and open source under the GPL.	Free Free and open source, dual-licensed under MIT or the Unlicense.
Windows, Command line	Windows, Command line
Quick date and time difference calculations from the terminal Built-in countdown timer	Datetime parsing, formatting and arithmetic in one tool User guide and comparison with other tools
Command-line only, with no graphical interface Requires Python 3	Young project with a short history Command-line only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT OR Unlicense
No account needed	No account needed
Works offline	Works offline
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.