Visual GUI designers vs hand-coding layouts
Posted 2026-05-05 on the pythondeck.com blog
Should you draw your interface in a visual designer or type it out by hand? It depends on the size of the project, the team and what you optimise for - but the answer is more nuanced than "real developers code by hand".
The honest case for hand-coding
Hand-coded layouts are unbeatable for one thing: they are reviewable as plain text in git. Pull requests show exactly what changed. Refactoring tools work. There is no parallel file format to keep in sync. For small windows with a handful of widgets, writing five lines of Tk or Qt code is faster than opening any designer.
The honest case for visual designers
Designers shine the moment your layout has more than ~15 widgets, nested containers, or needs to look right at multiple window sizes. Computing grid weights, paddings, sticky flags and column spans in your head is tedious and error-prone; dragging a handle and seeing the result is not. The other underrated benefit is that designers expose properties you didn't know existed - and discoverability matters when you're learning a toolkit.
The pragmatic middle ground
The best workflow we've seen on real teams: use a visual designer to lay out the structure (containers, geometry, fonts, colours), export the result to a .py or .ui file, and write all the behaviour (event handlers, validation, data binding) by hand in a separate file that imports the layout. Layout files almost never need to be diffed; behaviour files always do.
What to look for in a designer
- Exports clean, readable Python (or .ui / .kv) - not a binary blob.
- Round-trips: you can re-open and edit a previously exported file.
- Supports the geometry manager you actually want (grid, pack, place, anchors).
- Lets you set every standard property of every widget.
- Doesn't require a separate runtime - your end users just need Python and the toolkit.