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Pop vs Himalaya: catalog facts
Pop	Himalaya
Free The open-source software is available without a license fee. Hosting, hardware and…	Free The open-source software is available without a license fee. Hosting, hardware and…
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Offers interactive composition and a scriptable command-line mode.	Supports several mail protocols and local mailbox formats.
Requires SMTP credentials or a supported sending-service account.	Mail authentication and account configuration are required.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT OR Apache-2.0
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 September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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