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Himalaya vs Pop: catalog facts
Himalaya	Pop
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
Supports several mail protocols and local mailbox formats.	Offers interactive composition and a scriptable command-line mode.
Mail authentication and account configuration are required.	Requires SMTP credentials or a supported sending-service account.
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Apache-2.0	License: MIT
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.