Best AI Interior Design App in 2026: 7 Tools Compared

Seven apps cover the field. Three restyle a photo of a real room, two are 3D floor planners with AI features bolted on, and two are built for agents staging listings. The shortlist below is by user type; the section after it explains the criteria.

• Best for restyling a photo of your room: LazyKiwi AI interior design.
• Best for measured layouts and furniture fit: Planner 5D, with Homestyler for richer 3D renders.
• Best for shoppable staging: REimagineHome, with Collov AI as the agent-focused alternative.
• Best free start for designers: Spacely AI's free plan with a commercial licence.
• Best quick inspiration: RoomGPT, which states it has been used by more than 4 million people.

The best AI for interior design is a category question before it is a brand question. Decide which of the four criteria matters most, and most of the list drops away.

Photo-based or measured layout?

A photo tool changes what you see; a floor planner changes what fits. If the question is 'will a 220 cm sofa clear the door', only a planner with measurements answers it. If the question is 'would this room work in oak and cream', a photo tool answers it in one render. Interior design AI marketing blurs the two; the input field tells you which one you are looking at.

Does it preserve the structure?

Photo tools re-render pixels, so walls, windows and doors can move. REimagineHome advertises a structural lock that keeps walls, windows and ceiling lines fixed, per REimagineHome (2026); the LazyKiwi tool responds to explicit 'keep the windows, doors and flooring' instructions in the prompt. Count the windows in every output.

Shoppable furniture and export

REimagineHome and Collov AI attach real products to the render; IKEA's own Kreativ tool places IKEA products in a scanned room, per IKEA (2026). For everyone else the render is inspiration and the shopping is manual. On export, check the resolution the free tier allows and whether a watermark is applied; Spacely lists watermark-free downloads and a commercial licence on its free plan, per Spacely AI (2026).

The same test applies to each photo tool: one unretouched living-room photo with a window, a door, a radiator and visible flooring, one prompt asking for a warm Japandi restyle with the structure unchanged, and a count of what moved. Run it yourself before paying; the notes below are what each vendor page promised and what the interface exposes.

LazyKiwi AI interior design

One photo, one prompt, output from 1K to 4K. Image tools are what people actually use here: LazyKiwi's workbench data for August 2026 shows 57 external users ran image tools or templates against 17 for video templates. The strength is control through words: you can name what stays and what changes, rerun with one line altered, and switch to the virtual staging tool for empty rooms. The limit is that it is a photo tool; there are no measurements and no product links.

Homestyler

A cloud 3D floor planner whose free Basic plan includes uncapped 1K renders and access to a catalog the site describes as more than 100,000 free 3D models, with 4K renders purchased per render, per Homestyler pricing (2026). Best when you are rebuilding the room from measurements rather than a photo.

Planner 5D

The free plan allows any number of projects and half the furniture catalog; Premium is listed at US$4.99 a month billed annually at US$59.99, or US$19.99 month to month, and adds the full catalog plus floor-plan-to-3D conversion, per Planner 5D pricing (2026). The right tool for 'does it fit', the wrong one for 'how would it feel'.

RoomGPT

One photo, a handful of preset styles, instant results, and a homepage claim of more than 4 million users, per RoomGPT (2026). Prices were behind a sale banner and a login on the day, so check them yourself. Good for a first idea; expect furniture and geometry to change between renders.

REimagineHome

Photo in, structure locked, real products out with a budget and a cart. New users get five free designs, and the pricing page spans US$14 to US$99 monthly with an Essential tier at 30 credits, per REimagineHome pricing (2026). The most listing-ready of the photo tools.

Spacely AI

A designer-facing tool whose free plan is listed at US$0 with 40 trial credits, high-resolution downloads, a commercial licence and no watermark, per Spacely AI pricing (2026). That free tier is unusually generous on rights, which matters for client presentations.

Collov AI

Built for agents: AI virtual staging, regeneration included and no watermark, on a US$19 monthly Standard plan with 60 photo credits, plus an MLS partnership programme, per Collov AI pricing (2026). Less useful for homeowners who want to restyle a furnished room.

Yes, and the AI interior design free tiers are better than most categories. On 2026-09-06: a LazyKiwi account starts on the Free plan with 40 monthly credits and no card, per the pricing page, which at 13 credits a run is three restyles a month; Planner 5D and Homestyler run free planners with catalog limits; Spacely gives 40 trial credits with a commercial licence; REimagineHome gives five designs; Coohom markets itself as free 3D home design software, per Coohom (2026).

People searching AI room design free usually hit two limits: resolution and rights. Free renders are often 1K, and the licence may exclude commercial use. If the image is for a client, a landlord or a listing, read the plan's licence line before you send it, or use a tier that states the rights, as Spacely's does.

1. 1

   Photograph the room straight

   Chest height, level camera, daylight, the whole floor visible. Do not crop door or window edges; the model uses them to keep the geometry.

2. 2

   Upload and write the style prompt

   Open the AI image generator, pick the AI interior design tool, name one style and list what stays: 'warm Japandi living room, oatmeal sofa, light oak, linen curtains; keep the window, door, radiator, flooring and camera angle unchanged'.

3. 3

   Generate three variants

   Rerun with one line changed each time: palette, then lighting, then one accent. Three renders at 13 credits each fit inside a free month.

4. 4

   Stage empty rooms separately

   For a bare room use virtual staging instead; it is built to add furniture at room scale rather than restyle what is there.

5. 5

   Compare against the photo

   Count windows and doors, check the floor direction and the radiator. Reject any render where the architecture moved, however good it looks.

6. 6

   Upscale the keeper

   Run the chosen render through the AI photo upscaler before sharing it with a contractor or client, and label it as an AI concept.

When a room needs a new object that no tool offers, for example a bespoke bookcase, GPT Image 2 can draw it from a reference photo and a sentence, at up to 2K according to its model page; it sat behind 127 of 181 external generations in the August 2026 workbench data. The rest of the image-to-image tools cover extending, editing and restyling the same photo.

Two apps usually beat one: a planner for spatial truth and a photo tool for what the room will feel like. The best AI interior design app for a renovation is therefore a pair, and an app that claims both jobs is doing one of them badly.

• Structure hallucinations: windows widen, doors move, a wall gains a niche. Every photo tool does this sometimes; count openings in every render.
• No measurements: a photo render cannot tell you whether the sofa fits. Only a planner with dimensions can.
• Product availability: unless the app ties renders to a catalog, the lamp in the image does not exist. REimagineHome, Collov AI and IKEA Kreativ are the exceptions.
• Lighting fiction: renders default to golden-hour light that your north-facing room will never have.
• Licence gaps: free tiers may exclude commercial use; presenting a render to a client can need a paid plan.
• Disclosure: any render shown to a buyer or tenant is a concept image and should say so; Houzz Pro, for example, positions its AI renderings as tools for professionals' proposals rather than photographs, per Houzz (2026).

A render that changes the architecture is not a design idea, it is a different room. Count the windows before you fall for it.

— LazyKiwi creator playbook