Theme switching is the sort of feature that sounds like decoration. A nice-to-have, filed alongside custom accent colours and animated splash screens.
Then you spend a fortnight dictating in a dim room at seven in the morning with a bright white window in your face, and you revise that opinion fairly quickly.
The short version: the PeekoType desktop app has light and dark themes, switched with one toggle in the title bar. The change is instant, it applies to every open window including dialogs, and nothing you were working on is lost or reset.
Instant, and nothing is lost
The detail that matters most is what does not happen when you switch.
Plenty of applications handle theme changes by rebuilding their interface, which means anything unsaved in a text box can vanish, scroll positions jump, and open dialogs close. That turns a preference into a decision you have to time carefully, which rather defeats the point.
PeekoType re-colours the windows that already exist rather than replacing them. Your last transcription stays in its box. A vocabulary list you are halfway through editing stays exactly as you left it. Your place in the transcript history is kept. You can switch mid-task without thinking about it, which is the only way a theme toggle is genuinely useful.
Not just a preference
It is easy to treat this as taste, and for plenty of people it is. For others it is squarely an accessibility matter.
People with light sensitivity often find a bright white background genuinely painful over a long session. Migraine sufferers frequently report screen glare as a trigger. Some visual impairments are better served by high contrast light text on dark, others by the opposite. And a good number of dyslexic readers have a strong preference in one direction that makes sustained reading noticeably easier.
There is no single correct answer, which is exactly why the answer should not be chosen for you. Our guide to voice typing for dyslexia, ADHD and neurodiverse users covers the wider set of adjustments that help.
When each one wins
The practical rule most people arrive at is about the room, not the screen.
Dark suits low light. Early mornings, evenings, a room with the lights off. A bright window in a dark room is the digital equivalent of a torch in the face, and reducing that gap is a real comfort.
Light suits bright rooms. In daylight, dark text on a light background remains the most readable combination for most people, which is why books are printed that way. Dark themes in a sunlit room can look washed out and low contrast.
If you work through the day, switching once around dusk is a habit worth having, and it costs a single click.
A small note about the app and this website
Worth clarifying, because it catches people out. This is a feature of the PeekoType desktop application, not of this website. The app gives you both themes and lets you choose. This site is light only.
So if you are reading this on a bright page and wondering where the toggle went, it is in the app, in the top right of the title bar next to the pin button.
The philosophy behind it
Theme choice fits a pattern that runs through the whole app. Model size is your call rather than ours. Every piece of automatic cleanup, from filler removal to list formatting, is a toggle you control. History can be switched off entirely.
The common thread is that software should adapt to the person using it, rather than the other way round. Dictation is already personal, since you are literally speaking to it. The least it can do is look the way you want.
Every control, including the theme toggle and the pin button beside it, is documented in the user guide.