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Sequeler vs HeidiSQL: catalog facts
Sequeler	HeidiSQL
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL. Donations are welcomed but nothing is withheld.
Linux	Windows, Linux
Native GTK interface that fits Linux desktops SQL editor with syntax recognition	Exports structure and data directly to another server, not just to a file Native Delphi application; it starts instantly and stays small
Linux only Fewer features than large cross-platform database IDEs	Windows-first; the Linux builds come from a separate Lazarus branch No macOS build
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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