Best free interior design software

Most lists of free interior design software are affiliate pages in disguise. This one is shorter, honest about where "free" ends, and clear about the three costs that never appear on the price tag.

Blender — free, and genuinely professional

Free, open source, cross-platform, no feature restrictions, no watermark, no commercial licence to buy. It is used on feature films. The ceiling is not the problem.

Good at: modelling, rendering through Cycles, fabric and cloth simulation, animation, product visualisation. For close-up material work it is genuinely excellent — simulated drape is why it holds up on textiles where other tools do not.

Bad at: being learned quickly. The interface assumes you are a 3D artist rather than a designer, the terminology is unfamiliar, and nothing guides you. Budget two to three months before it feels natural, and expect the first fortnight to be unpleasant.

Not a documentation tool. You will not produce a dimensioned drawing set in Blender and you should not try. It is a modelling and rendering application that happens to be free, not a replacement for CAD.

SketchUp Free — the fastest start, with a catch

Runs entirely in a browser, costs nothing, and has you modelling within an hour. For roughing out a layout, testing a joinery idea, or showing a client a massing option, nothing free is faster.

The catch is real and people get caught by it. The free tier is licensed for personal use only. Commercial work requires a paid subscription. Designers discover this after building a client project in it, which is an avoidable way to lose a weekend and, in principle, a licence dispute.

You also lose extensions — which is most of what makes paid SketchUp powerful — and you cannot work offline, which matters on site more than you would think.

Sweet Home 3D — the honest small tool

Free, open source, deliberately limited. 2D plans with a synchronised 3D view, a furniture library, basic output.

It will not produce a presentation render and does not pretend to. What it does well is let a client or homeowner sketch a layout themselves, which occasionally makes it the right tool to hand somebody rather than the right tool to work in. That is a genuine use and nobody lists it.

Twinmotion — the best free thing here, if you qualify

Not free universally, but free below certain annual revenue thresholds and free for education. If you are eligible, this is the single most valuable item on the page: a real, current, photoreal rendering engine at no cost.

Check the current terms before relying on it. The threshold has changed more than once, and it is the kind of thing that changes again.

Student licences — the ones nobody advertises

AutoCAD, Revit, Rhino, V-Ray and more are all free for verified students and educators. Full versions, not trials, typically for a year and renewable while you qualify.

If you are eligible, claim everything now. You cannot claim it retroactively, and the value dwarfs everything else on this page. This is consistently the most useful advice in this article and the least often given.

The rest, briefly

• FreeCAD — free and parametric, aimed at mechanical engineering. Powerful, awkward for interiors, and a steeper curve than Blender for less relevant reward.
• LibreCAD — free 2D CAD. Functional, dated, and fine for simple plans if you have no alternative.
• Canva and Figma — free tiers, genuinely useful for moodboards and concept boards. Not design software in the CAD sense, but they cover a real stage of the work.
• Google Sheets — unglamorous, and it is what most studios run FF&E schedules in anyway. What matters is whether the schedule has a lead-time column, not what produced it.

The three costs nobody mentions

Time. Blender's learning curve is genuinely months. If your hourly rate is meaningful, the paid tool you already know is frequently cheaper than the free tool you have to learn. Work it out honestly before committing a quarter of a year.

File exchange. Clients, architects and contractors ask for DWG, SKP or RVT. Free tools export to these with varying success, and "varying success" on a live project means an evening you had not planned for.

Support. When paid software breaks, you raise a ticket. When free software breaks at eleven at night before a presentation, you search a forum thread from 2019 and hope.

None of these make free software a bad choice. They make it a choice with a price that is paid in a different currency.

The gap free software does not fill

Worth being direct: there is no good free option for professional construction documentation. Blender does not do it, SketchUp Free cannot be used commercially, FreeCAD is the wrong shape, and LibreCAD is a long way behind.

If your deliverable is a drawing set, this is the stage where paid software earns its cost, and where trying to save money produces the most pain. Cheaper alternatives to AutoCAD exist — they are covered in interior design software costs compared — but free ones do not, really.

What we would actually do

• Starting out, no budget — SketchUp Free to learn spatial thinking, then Blender when you need rendering. Both cost nothing and between them cover concept through to image.
• Student — claim every education licence you qualify for today, then learn Blender anyway, because the licence expires and Blender does not.
• Working professionally — free tools are a supplement, not a stack. Pay for the one tool that produces your deliverable, and use free software around it.
• On a Mac — everything listed here except the student Revit licence runs natively. See best interior design software for Mac.

For what the paid stack usually looks like, see what software do interior designers actually use.