Interior Design AI Software: The 2026 Comparison

If you landed here after trying RoomGPT, you're probably looking for something with more design styles, a bigger free tier, or a way to work from an actual 3D model instead of a single photo. This guide compares six interior design AI software tools, RoomGPT, Interior AI, Spacely AI, Remodel AI, Gendo, and FORMAS.AI, on what they actually do, what they cost, and who each one fits. If anything, the biggest split between these tools isn't price, it's the input they accept: an uploaded photo of your current room versus a real 3D file or sketch from an actual design project.

None of them do the exact same job, so the best ai interior design app for you depends on whether you want a fast photo redesign or a professional AI design platform built around real 3D files.

What Counts as Interior Design AI Software

Interior design ai software covers two different jobs that get lumped together in search results. The first is photo redesign: you upload a room photo, pick a design style, and the tool generates a new version of that same home interior. The second is 3D-native design software: you work from a sketch, a floor plan, or an actual 3D model, and the AI helps you develop and render it. This guide sticks to indoor rooms, some of the tools mentioned also touch outdoor spaces and landscaping, but that's outside what we're comparing here.

Most of the tools ranking for this keyword, RoomGPT, Interior AI, Spacely AI, and Remodel AI, are photo redesign interior design apps. They're fast, cheap to try, and built for homeowners and content creators who want inspiration images, and most let you preview multiple styles before you commit to one. Some produce genuinely impressive realistic images for a first pass; others are rougher and need a few tries to get right.

FORMAS.AI is an AI design platform for architects, interior designers, and design students that turns sketches, photos, and 3D model files into photorealistic renders by orchestrating more than 50 specialist AI models. It's built for people who are already working in CAD or 3D software, not just people with a phone photo of their living room.

Comparing All Six Tools at a Glance

Here's what each tool starts with for free, what it takes as input, where paid plans begin, and who it fits best:

• RoomGPT: Starts free with a trial credit (the amount requires signup to see). Core input is a single room photo. Paid plans come as credit packs, with pricing gated behind account creation. It markets itself around one-photo, one-click speed.
• Interior AI: As of this writing, interiorai.com shows no free tier or trial credits; access starts once you sign up and pay. Core input is a single room photo. Paid plans start at $29/month billed annually ($49/month billed monthly). It markets a roughly 25-second render time.
• Spacely AI: Starts free with 40 trial credits and no watermark. Core input is a photo, or you can generate a room from scratch; it also offers a free SketchUp extension for working directly on existing 3D models. Paid plans (which add Revit, AutoCAD, and Rhino integrations) start with credit packs from $9 for 200 credits. Its main differentiator is CAD integrations.
• Remodel AI: Starts free with 3 full designs, no card required. Core input is a single room photo. Paid plans start at $29/month for 1,000 designs. It has the highest-volume free tier among the photo tools here.
• Gendo: Starts free with a Free plan at £0/month, plus an Educational Plan for .edu/.ac emails. Core input is sketches, hand sketches, or SketchUp exports. Paid plans start with Studio at £66/month billed annually (£79/month billed monthly).
• FORMAS.AI: Starts free with 500 credits on signup, then 50 credits per month afterward. Core input is a sketch, photo, or 3D model file (GLB, GLTF, OBJ, FBX, STL, Rhino 3DM, or PDF). Paid plans start at $19/month (Student plan $19.90/month). Best for working from a 3D model file or any CAD-exported format, not just a photo.

A quick note on "free": free versions of these tools use different credit systems that burn at different rates, so a bigger free-credit number doesn't automatically mean more free renders. Read what a single generation costs before you compare tiers directly.

Why People Search for a RoomGPT Alternative

RoomGPT popularized the one-photo, one-click room redesign. Upload a photo, choose a theme, get a new version back in seconds. That simplicity is also its limit: you get one input type (a photo), a fixed set of themes, and no way to work from a floor plan or a real 3D model.

If you're a homeowner who just wants inspiration, that's often enough. If you're a design student, an architecture firm, or anyone who needs to iterate on an actual space rather than reskin a photo, you'll likely need one of the tools below that goes further. That's the gap the rest of this list fills, in different directions.

RoomGPT: The Original One-Photo AI Redesign Tool

RoomGPT lets you upload a photo of your current room and get an AI-generated redesign back in a new style. It's one of the earliest ai room design tools to go viral, and it's the reason so many alternatives exist. Its biggest strength is an intuitive interface: upload a photo, pick a style, done.

Pricing and Free Tier

RoomGPT runs on a credit system. You get a trial credit when you sign up, and additional credits come in paid packs. As of this writing, RoomGPT doesn't publish its plan pricing on the public marketing page, you need to create an account to see current credit and plan pricing.

Trade-offs

RoomGPT only takes a photo as input. There's no floor plan tool, no 3D model import, and no way to place real furniture at scale. If your project needs any of that, RoomGPT isn't built for it, which is exactly why "RoomGPT alternative" is such a common search.

Interior AI: Fast Photorealistic Renders at Scale

Interior AI (interiorai.com) is built around speed. According to its own pricing page, it takes about 25 seconds to generate one interior redesign, and the platform offers more than 55 interior design styles across more than 30 room types.

Pricing

Interior AI's published pricing is $49/month for the Pro plan (1,000 designs/month) when billed monthly, or $29/month when billed annually. The Premium plan ($99/month monthly, $49/month annually) and Ultra plan ($199/month monthly, $99/month annually) scale up from there for higher design volume. As of this writing, interiorai.com's homepage and pricing do not show a free tier or free trial credits anywhere, access begins once you sign up and pay. Interior AI redesigns a room in about 25 seconds according to its own page.

Where It Fits

For a redesign of a single room photo with a range of styles, Interior AI lists a roughly 25-second generation time and more than 55 styles. It doesn't touch 3D modeling or CAD file import, so it stays focused on the same job as RoomGPT, with more styles and a published speed claim.

Spacely AI: Free Renders With CAD Integrations

Spacely AI's free plan includes 40 trial credits with full feature access, high-resolution downloads, and no watermark, according to its own pricing page. That's a generous free tier compared to most photo redesign tools.

Pricing

Beyond the free tier, Spacely sells credit top-ups directly: $9 for 200 credits, $35 for 1,000 credits, and $150 for 5,000 credits. Its Personal, Studio, and Agency subscription plans don't show a price on the public pricing page, you need to go further into checkout to see monthly cost. Its own pricing page lists Pro features, Realistic Render, Auto Furnish, Point and Edit, material settings, and 4K downloads, as part of the Personal plan and above.

What Sets It Apart

Spacely offers a free SketchUp extension, installable from the SketchUp Extension Warehouse at no cost and with no credit card required, that renders your existing SketchUp models into photorealistic visuals without leaving the app. Its paid Personal, Studio, and Agency plans go further, adding integrations with Revit, AutoCAD, and Rhino. It also works as an ai design generator, letting you regenerate a whole room from scratch without uploading a photo first, which none of the pure photo-redesign tools do. That extra flexibility adds a small learning curve compared to a one-click tool.

Remodel AI: The Most Generous No-Card Free Tier

Remodel AI's free plan gives you 3 full-quality designs with all 30+ interior styles and all 8 AI tools included, no credit card required, according to its own pricing page. For a free tier, that's a wide amount of access before you have to pay anything.

Pricing

Paid plans start at $29/month for the Pro tier (1,000 designs/month, HD downloads, no watermark, virtual staging), scaling to $49/month for the Premium plan (5,000 designs/month, running what Remodel AI calls its Hyper Realism model for hyper realistic renders) and $99/month for Ultra (25,000 designs/month, commercial licensing, API access). Across these tiers, Remodel AI's listed cost per design drops as the monthly design volume goes up.

Where It Fits

Remodel AI is a photo redesign and virtual staging tool, like RoomGPT and Interior AI. It doesn't offer 3D model import or CAD-native workflows. Among the photo tools compared here, its free tier offers the largest allotment before a paid plan is required.

Gendo

Gendo generates renders from hand sketches, digital sketches, and SketchUp exports on a shared canvas, and also supports material edits and style transfers on existing renders. Its own site does not publish which underlying AI models power the platform or make any foundation-model claims, describing it only as "powered by AI." It offers a Free plan at £0/month and a separate Educational Plan for .edu/.ac email addresses. Paid plans start with Studio at £66/month billed annually (£79/month billed monthly), with a Studio Scale plan at £299/month (early access) above that, and custom Enterprise pricing for teams of 20 seats or more. It does not import 3D-native formats such as GLB, OBJ, or Rhino 3DM.

FORMAS.AI: AI Interior Software Built From 3D Files, Not Just Photos

FORMAS.AI is an AI design platform for architects, interior designers, and design students that turns sketches, photos, and 3D model files into photorealistic renders by orchestrating more than 50 specialist AI models. That's the core difference between FORMAS.AI and the photo-only tools above: instead of accepting only a room photo, it imports actual project files.

Key Features and What It Imports

FORMAS.AI accepts GLB, GLTF, OBJ, FBX, STL, Rhino 3DM, and PDF files, alongside sketches and photos. If you're already working in Rhino, SketchUp exports, or any standard 3D format, you can bring that geometry in directly instead of starting from a flat photo. That makes it a better fit for professional interior designers and other design professionals running real design projects than for someone who only has a phone photo of their current room.

How the AI Works

FORMAS.AI orchestrates more than 50 specialist AI models, giving you access to different rendering and generation engines from a single interface instead of locking you into one house style, so you can pick the model suited to a given render rather than settle for whatever one engine produces. Freeform Studio is the one part of the platform trained in-house, a sketch-based canvas for exploring geometry before it gets rendered.

Pricing and Free Tier

New signups get 500 credits, then 50 credits per month afterward. Paid plans start at $19/month, with a Pro tier at $69/month and a Pro Plus tier at $129/month. There's also a Student plan at $19.90/month. Each plan caps how many 3D models you can save: 3 on Starter, 5 on Go, 8 on Pro, and 20 on Pro Plus.

Trade-offs

If all you want is a one-click redesign of a single room photo, FORMAS.AI involves more setup than that job needs; RoomGPT, Interior AI, and Remodel AI accept only a photo as input. FORMAS.AI also doesn't publish generation speed numbers, so if speed is your deciding factor, compare it directly against Interior AI's published 25-second claim before you commit.

How AI Interior Design Software Actually Works

Whichever tool you pick, most interior design ai software shares a similar set of underlying ai capabilities and generative ai technology. Here's what's actually happening behind the interface.

Photorealistic Rendering From a Photo or Model

The core function across nearly every tool on this list is generating ai images, turning an input, a photo, a sketch, or a 3D file, into a photorealistic render. Photo redesign tools generate a new style directly from your uploaded photo of a real space. 3D-native tools like FORMAS.AI generate renders from geometry you already built or imported. Some platforms can also generate interior images from a text prompt alone, without any uploaded photo at all.

Floor Plan to 3D Conversion

Some tools in this category can take a 2D floor plan or sketch and convert it into an editable 3D model, which is useful if you're starting from an architect's drawing rather than a finished room. This is a different capability from photo redesign, and not every tool in this comparison offers it, so check before you assume a tool can do both.

Furniture Placement, Material Swaps, and Room Layouts

AI interior design tools can analyze room dimensions and suggest furniture placement across different room layouts, and some let you swap materials and colors on existing objects instantly rather than regenerating the whole image. How well these ai suggestions work varies a lot by tool, so treat any specific claim as something to verify on that vendor's own product page rather than take at face value.

Concept Generation and Spatial Planning

Beyond a single render, some AI design tools help earlier in the process too: generating quick mood-board style concepts, preserving accurate dimensions as you test layout options, and speeding up the back-and-forth of sharing a concept and getting client feedback. None of that replaces a trained designer's judgment, but it can cut the time spent producing a first draft to react to.

Virtual Staging: Furnishing Empty Spaces for Real Estate

Virtual staging, adding furniture and decor to photos of empty rooms, is a specific use case that several tools in this space support, mainly for real estate listings. Tools built for this let you virtually stage empty spaces convincingly enough to use in a listing photo. If that's your use case, look specifically for a tool that markets virtual staging as a feature, since not every general interior design ai software tool supports empty-room staging well.

Best AI Interior Design Software: Quick Photo Tool or Professional Platform

If you have a room photo and want home decor inspiration in under a minute, RoomGPT, Interior AI, and Remodel AI all accept a room photo as input and are built around that exact workflow, keeping the overall aesthetic consistent across different rooms. Their free tiers (where available) let you preview output quality before paying. These tools produce redesign concepts without a professional designer, though how close the render looks to real life varies by tool and by room. A few competitors in this space also add shopping integration so you can buy the furniture shown in a render.

If you're a design student, architect, or interior designer who works from CAD files, sketches, or real 3D models, and you need a platform that can ingest that geometry directly, FORMAS.AI is the best ai interior design option on this list for that job. It won't replace the judgment of a trained designer, and it isn't the fastest option if all you have is a phone photo of your current room. Unlike the photo-only tools here, and unlike Spacely's CAD plugins or Gendo's sketch canvas, which are each tied to a specific input type or named program, FORMAS.AI works from any software that exports GLB, GLTF, OBJ, FBX, STL, Rhino 3DM, or PDF.

Either way, the honest move is to try the free tier of whichever tool matches your actual input, a photo, a sketch, or a model, before you commit to a paid plan.

Frequently Asked Questions

Is there a good AI tool for interior design?

Yes. RoomGPT, Interior AI, Spacely AI, and Remodel AI all handle photo-based room redesign. FORMAS.AI works from sketches or 3D model files instead of a single photo.

Is there a free AI tool for room interior design?

Yes, for most of these. RoomGPT, Spacely AI, Remodel AI, Gendo, and FORMAS.AI all offer some form of free tier or trial credits, though the amount of free access and what it includes varies by tool. Interior AI's site currently shows no free tier, access starts once you sign up and pay.

What is the best free interior design software that uses AI?

Remodel AI's free plan gives you 3 full designs with all 30+ styles and all 8 tools included, no credit card required, which is one of the more generous free entry points among photo redesign tools.

What is the best AI decorating app?

It depends on your input. Interior AI and Remodel AI accept a phone photo as input. FORMAS.AI imports a real 3D model or CAD file directly.

What is the best free room designer app?

Spacely AI's free plan includes 40 trial credits with full feature access and no watermark, according to its own pricing page.

Is there a free AI room designer available?

Yes, several. RoomGPT, Spacely AI, Remodel AI, and Gendo all let you generate at least a few room redesigns for free before asking you to pay. Interior AI does not currently offer a free option.

Which AI app is best for room decor?

Interior AI and Remodel AI generate style ideas from a photo. FORMAS.AI supports furniture placement and material swaps on a 3D model you're already working with.

Is there an app that I can take a picture of a room and remodel it?

Yes. RoomGPT, Interior AI, Spacely AI, and Remodel AI are all built around that exact workflow: upload a photo, pick a style, get a redesigned version back.

Can I use AI to do interior design?

Yes, for parts of the process. AI tools can generate style ideas, redesign a photo, convert a floor plan to 3D, and suggest furniture placement, but they don't replace a trained designer's judgment on structural, budget, or code decisions.

Is RoomGPT free to use?

RoomGPT gives new users a trial credit on signup, then requires paid credits for additional redesigns. Its full plan pricing isn't published on the public site, you need to create an account to see current rates.

Is there a free AI to generate interior design?

Mostly, yes. RoomGPT, Spacely AI, Remodel AI, Gendo, and FORMAS.AI each offer some free credits or a free tier before you need to pay. Interior AI is the exception here, its site currently requires payment before you can generate a design.

Can I use ChatGPT for interior design?

You can use ChatGPT to brainstorm design ideas or describe a style direction in text, but it doesn't generate photorealistic room renders on its own. For actual images, you need a dedicated image or rendering tool like the ones compared above.

What is the best ai interior design tool for someone who already has a 3D model or CAD file?

If you're working from an actual 3D file rather than a phone photo, FORMAS.AI is the ai interior design tool built to import GLB, GLTF, OBJ, FBX, STL, Rhino 3DM, and PDF files directly. Spacely AI offers a free SketchUp extension and Gendo accepts SketchUp exports, for workflows built entirely inside those specific programs.

FORMAS.AI is built for the part of the interior design process that starts after inspiration, when you're working from a real sketch, floor plan, or 3D model and need photorealistic output you can actually use. If a quick photo flip is all you need, one of the other tools will get you there faster. If you're working from real project files, FORMAS.AI is worth trying.

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