How Slint compares.
Honest and side-by-side. Qt, Flutter, LVGL, Electron and the Rust-GUI crowd each do part of this well. Slint is the one that spans all of it from a single codebase — and the only one your AI agent can target end-to-end.
Fair comparisons · we link to the deep dives · your mileage may vary
| Slint | Qt | Flutter | LVGL | Electron | |
|---|---|---|---|---|---|
| Reach, one codebase | MCU → desktop → web | Embedded → mobile | Mobile → desktop/web | MCU / embedded | Desktop only |
| Runs on microcontrollers | ✓ | limited | ✗ | ✓ | ✗ |
| Languages | Rust · C++ · JS · Python | C++ / QML | Dart | C | JS · HTML · CSS |
| Memory-safe core | ✓ Rust | ✗ C++ | ✓ via GC | ✗ C | ✓ via GC |
| Runtime footprint | ~300 KiB | Large | Large | Tiny | Very large |
| Royalty-free option | ✓ | GPL / commercial | ✓ | ✓ MIT | ✓ MIT |
| AI agent can target it MCP + llms.txt | ✓ | — | — | — | — |
Each tool is strong in its lane — LVGL is tiny on MCUs, Flutter shines on mobile, Electron leans on web skills. Slint's edge is doing the whole span from one memory-safe codebase. See the deep dives below.
The deep dives
Switching from something specific?
Detailed, fair comparisons — migration notes, trade-offs, and where Slint wins or doesn't.
Lighter and memory-safe, with a friendlier DSL than QML and far simpler licensing — without giving up native reach.
Slint vs Qt →Native languages instead of Dart, a fraction of the footprint, and real microcontroller support Flutter can't reach.
Slint vs Flutter →Keep the tiny-MCU story, gain a declarative DSL, live preview, multi-language bindings and a desktop/mobile/web path.
Slint vs LVGL →Native and tiny instead of bundling a browser — same fast iteration, none of the hundreds of megabytes.
Slint vs Electron →Not just another Rust crate: a designer-friendly declarative language, multi-language bindings, and embedded → web reach.
Declarative Rust GUI →None of them can be driven by an AI agent that writes, runs and verifies the UI. That's the quadrant Slint owns.
See the AI story →Common questions
Slint vs the alternatives, answered
Is Slint a good alternative to Qt, Flutter, LVGL, and Electron?
Yes. Slint is a declarative GUI toolkit that spans embedded, desktop, mobile, and web from a single codebase. It has a smaller footprint than Qt, Flutter, and Electron, real microcontroller support those three lack, and a declarative language with multi-language bindings that LVGL's C API doesn't offer.
How much lighter is Slint than Electron or Flutter?
Slint compiles to native machine code and does not bundle a browser engine or a large runtime. Its runtime fits in under 300 KiB of RAM, so binaries and memory use are a fraction of an equivalent Electron or Flutter app.
Which languages does Slint support compared to these toolkits?
Slint provides official APIs for Rust, C++, JavaScript/TypeScript, and Python, so you keep your existing toolchain instead of adopting Dart (Flutter), QML and C++ (Qt), or C (LVGL).
Does Slint run on microcontrollers like LVGL?
Yes. Slint runs on resource-constrained microcontrollers with a runtime under 300 KiB of RAM, and unlike LVGL it also scales up to desktop, mobile, and web from the same UI codebase.
How does Slint's licensing compare to Qt's?
Slint is available under an open-source GPLv3 license, a royalty-free license for proprietary desktop, mobile, and web apps, and a paid commercial license with support — a simpler model than Qt's.
What can Slint do that Qt, Flutter, LVGL, and Electron can't?
Slint is targetable end-to-end by an AI coding agent through its MCP server and llms.txt, so an agent can write, run, and verify a Slint UI. None of the others expose the project to AI agents that way.
The one thing none of them do
One codebase. Every screen. AI-assisted.
From a microcontroller to the browser, memory-safe, and targetable by your coding agent. Pick the comparison that fits — or just start building.
Open source · royalty-free for desktop, mobile & web · commercial & support available