Does Harpoon have a Dark mode for its interface?

Yes! Harpoon has a few different theming options to pick from, including a Dark theme. In your Account menu you'll find an option for Harpoon's Theme Picker:

Selecting that option brings up the Theme Picker interface:

Here you can pick from a few different theming options:

• Automatic – When this option is selected Harpoon will automatically match the appearance of your operating system (where supported). For example, if you're on a Mac and your Appearance system preference is set to "Dark" then Harpoon will automatically apply the Dark theme. It works with your operating system's "Auto" preference as well, automatically switching between Dark and Light themes based on the time of day.
• Light – This is the default theme you've come to know and love, which uses Harpoon's blue branding color for many of the interface's accents and highlights.
• Dark – Harpoon's Dark theme isn't simply an "inverse" of the Light theme. Not even. We carefully reconsidered the color of every component to strike a balance between a strong contrast for optimum legibility and just plain beautiful eye candy. The result is an interface that's easy to read during those late evening work sessions, yet so visually pleasing you might never turn it off.
• Snow – Our bonus theme, and my new personal favorite, Snow replaces most of Harpoon's blue branding accents with subtle shades of gray and white. If you do your best work in a minimalist environment then this is the theme for you.