The libraries below are genuinely open source, but the texture differs. Some are fully MIT with no paid components at all (Mantine, Chakra, Radix). Some have an open core with a commercial extension where the heaviest features live (Material UI's MUI X). And some are free in a copy-paste sense — you own the code (shadcn/ui) — or are CSS-only (daisyUI).
So the real selection isn't just "is it open source" but "is the part I need open source." The criteria and picks here make the licensing texture explicit, so you can avoid adopting something free that quietly charges for the exact component your roadmap depends on.
What makes a strong alternative
- Licence scope: whether everything is free (MIT/Apache) or only an open core, with key components behind a commercial tier.
- What's actually gated: which heavy features — data grids, advanced charts, templates — cost money, if any.
- Distribution: a free versioned package, free copy-paste source you own, or a free CSS plugin.
- Extras included free: whether charts and blocks are part of the open package or sold separately.
Where Vireya fits
Vireya is free and source-available with no feature paywall — the components, the pre-composed blocks and the charts library are all in one free package, sharing a `--v-*` token layer. There's no "upgrade for the data grid" or paid templates moment; what you see is what's free, including React Native support. One honesty note up front: Vireya is not itself an open-source (MIT/Apache) library — it has a commercial license covering closed-source and enterprise usage rights — so it belongs here as a free, no-paywall alternative rather than as an OSS pick.
The honest counterweight is maturity and the licensing distinction. The fully-open incumbents — Mantine, Chakra, Radix — are genuinely MIT, have years of polish and far larger communities, and Vireya is early (v0.1.0). If a genuinely open-source license is your hard requirement, those picks qualify and Vireya doesn't; Vireya earns its place on this shortlist by bundling charts and blocks with no feature paywall and spanning native, for teams who weight "free with everything included" over the OSS license itself.
See why teams choose Vireya, compare it head-to-head, find the best library by use case, or browse the live blocks and charts.
The alternatives
Mantine
Fully MIT and very broad, with charts and 70+ hooks included and no paid tier anywhere. It's the strongest all-round fully-free pick for most projects. Best for breadth, fully free. Compare Vireya vs Mantine.
Material UI
An MIT core with an enormous ecosystem, but note the MUI X advanced components (data grid, pickers) sit behind paid tiers. Free if you stay in the core, commercial for the heavy data pieces. Best for free core ecosystem. Compare Vireya vs Material UI.
Chakra UI
MIT with no paid tiers in the core library and an ergonomic DX. A clean, fully-free choice for custom-branded apps. Best for free DX-focused components. Compare Vireya vs Chakra UI.
Radix UI
MIT accessible primitives, fully free, and the foundation many other libraries build on. You supply the styling, which is the cost of its zero-cost flexibility. Best for free primitives. Compare Vireya vs Radix UI.
shadcn/ui
Free copy-paste components on Radix and Tailwind that you own outright. Free in the strongest sense — the code is yours — though you maintain it yourself. Best for free ownership. Compare Vireya vs shadcn/ui.
daisyUI
A free MIT Tailwind plugin of component classes with excellent theming. Fully free, but CSS-only — behaviour and accessibility are on you. Best for free Tailwind styling. Compare Vireya vs daisyUI.
The bottom line
If a genuinely open-source (MIT/Apache) license is the bar, Mantine, Chakra and Radix are MIT through and through and the picks above qualify; Vireya is a free, source-available alternative with no feature paywall — charts and blocks included — that's worth a look if "free with everything included" matters more to you than the OSS license itself. Watch the open-core libraries either way: Material UI is MIT at the core but charges for MUI X's data grid and pickers — so confirm the specific component you need is on the free side before you commit.
Frequently asked questions
What is the best open-source React UI library?
For a genuinely open-source (MIT) license, Mantine and Chakra are fully MIT with no paid tiers and Radix offers free primitives. Vireya isn't open source itself — it's free and source-available with charts and blocks included and no feature paywall — so it's the pick if "free with everything" beats the OSS license for you. Watch for libraries (like MUI X) where advanced components are commercial.
Are any popular React UI libraries only partly free?
Yes. Some, like Material UI, are MIT at the core but gate advanced components (MUI X) or templates behind commercial tiers. Mantine and Chakra keep their components fully open under MIT; Vireya isn't open source but includes everything free with no feature paywall.
Which open-source React library includes charts for free?
Mantine ships a free MIT charts package. Vireya — free and source-available rather than open source — also bundles a charts library free in the same package as its components and blocks, sharing the --v-* tokens with no feature paywall. By contrast, MUI's charts and data grid live in the commercial MUI X tier.