3D interior design software: develop your room in Formas

Formas helps interior designers, architects and homeowners compare layouts, furniture placement and materials before a renovation. It connects room photos, sketches and existing 3D models with tools for developing design ideas and presenting them to a client. You can arrange references and furniture assets on a canvas, revise materials with Smart Notes, navigate an imported model, generate a material moodboard and make a panorama or video. Formas templates are free. Start with a free account and its included credits.

The right 3D interior design software also depends on what you need to hand over. Choose Formas when you have a room photo, references or a model and need to turn the design direction into client visuals and material boards. HomeByMe and Planner 5D suit room layouts built around furniture libraries. SketchUp gives you control over custom geometry. RoomSketcher concentrates on floor plans and property presentations.

This comparison draws on current vendor documentation and official demonstrations, checked on 3 November 2026. Prices below are in USD, with billing terms stated where available.

Develop your interior concept in Formas Studio.

Compare the best interior design software by the job

Formas connects room references, model views and client presentations. For layout work, Planner 5D's drag-and-drop app is beginner-friendly without first learning complex modeling. RoomSketcher lets you upload a blueprint and trace it, set its scale from a known measurement, then edit walls, doors and furniture. SketchUp's 3D Warehouse provides premade models alongside custom geometry. Sweet Home 3D's simultaneous 2D and 3D views let beginners draw a wall or move a chair in the plan and inspect the effect in 3D. Choose around the required handover.

A furnished model, an AI-generated room image and a navigable presentation answer different questions. A model helps you inspect geometry and placement. A generated image helps you compare a visual direction. Choose the required output before comparing subscription prices.

Formas: develop the room and its presentation together

Formas is useful when the design starts with more than a floor plan. A room photograph, furniture reference, rough sketch or existing model can all carry decisions worth keeping. Its studios let you develop those inputs into related views and presentation material.

Advanced features: navigate and visualize a 3D model

The official 3D model to image studio tutorial covers bringing in models. The studio imports OBJ, 3DS, GLB, GLTF, STL, 3DM, FBX, PLY, IFC and SKP files. You can orbit or walk through the scene, save camera views, adjust the sun by location and time, and change an asset's scale, height or orientation. It also covers local geometry edits and generating images from a selected view with Precise or Context mode.

A May workshop demonstrates a direct Rhino 3DM import, followed by model, sun, map-context and camera setup. Google Maps and Google Earth context can help place the proposal in its surroundings, including the setting seen through interior openings.

Keep the model viewport and generated image identifiable in a presentation. The viewport provides model navigation; the generated image communicates a material or lighting proposal. Check any changed openings, furniture or proportions against the model before approving them.

Formas is also directly integrated with SketchUp, so you can work from a SketchUp model.

Redesign a photographed room with reusable assets

Freeform Studio combines sketches, cutouts, images and shapes on a canvas. Deconstruct can produce an unfurnished room view and extract furniture or other objects. Save useful objects to a catalogue, then reuse them on a board or in image notes for another composition. The July workshop shows this room-and-furniture workflow.

Use Smart Notes to point at a surface or object and specify a change. Attach a timber, fabric or furniture reference so the request has a visible target. The Notes tutorial demonstrates annotations, arrow pins and texture references for local revisions.

Extraction can reconstruct hidden parts and alter details. Check a reused chair or light fitting against its product reference. Treat any estimated dimensions, costs or supplier suggestions as leads to confirm with the manufacturer.

Formas also has an image-to-3D route for generating a textured model from a 2D image. That's useful when you need a 3D asset to develop further. It downloads as a GLB file. Check its geometry and dimensions before using it in a production model. The homepage describes this separately from visualizing an existing model.

Carry the material direction into the client meeting

Drawing Studio can turn an interior image into a material moodboard. Choose a preset or build a reusable Agentic Drawing Style from references, composition instructions and a palette. The material moodboard guide shows how to test, refine and save that style for later project images.

A practical presentation might pair an approved room view with its material board and one alternative finish. Save the direction you want to repeat, then review the generated materials and furniture across every view.

For a complete example, the August interior-design workshop develops one Freeform board into a lounge, bedroom and bathroom. It connects references and material swatches with image refinement, a panorama and a video narrative. Use it as a worked example of preparing room imagery and presentation outputs together.

Choose the right form of walkthrough

Formas supports several ways to communicate space:

• In the 3D model to image studio, orbit and walk through an imported model while choosing views.
• Generate a Panorama 360 for a client to look around from one position. The documented workflow supports a viewing link or QR code.
• Use Formas Worlds for an explorable generated environment. The Worlds sharing tutorial shows walking controls and a browser-viewing link. Its geometry needs checking against the design.
• Make a video from selected images with Instant Narratives or Video Shots. A video controls the sequence the client sees.

The September workshop also previews Presentation Agents that turn selected images into editable PowerPoint slides. Check preview access if that export is essential to your project.

Plans and the Cartesian preview

Formas generation uses credits, with costs varying by operation. Compare the current plans against your export, quality and collaboration needs.

Starter is $19 monthly with watermarked exports. Go is $35 monthly with full-resolution, watermark-free exports. Pro is $69 monthly and includes board sharing and comments, Viewpoint Studio, point clouds and 2K/4K access. Annual billing has different prices. The page gives conflicting Starter credit allowances, so check that detail before buying.

Cartesian by Formas is a separate preview for developing editable 3D components from briefs and visual references. Its waitlist is open. Check preview access and exchange formats if you need editable components for a model handover.

Beginners choosing free interior design software should try one measured room first. Learn how to change a wall, move furniture and save the required output before committing an entire house.

Help interior designers compare design ideas before construction

A 3D floor plan adds depth to a flat layout: you can judge furniture relationships, heights and the future space from a viewpoint a 2D drawing cannot show alone. Realistic rendering helps people picture the renovation's materials and lighting before construction starts. Reviewing those choices together can improve confidence in the design process and reveal questions worth resolving early.

Use Formas to connect that review with mood boards and alternative room images. Keep the source model or measured plan beside the visuals so a client can explore the appearance while the team checks fit and dimensions.

Professional interior designers can define the handover for each interior design project at the start: layout studies, a furniture schedule, material boards and presentation views. Use the same brief and room dimensions when comparing tools. Judge rendering quality by whether the images explain finishes and lighting, and whether recurring furniture and openings remain consistent. A larger image alone doesn't resolve a design discrepancy.

For a renovation, begin with the measured room layout and the objects you intend to keep. That might be a model you've already made, a survey drawing or photographs used alongside known dimensions.

Use Formas to develop the visual direction. Deconstruct a room photograph, reuse furniture references, and add Smart Notes for the changes you want. If you have a model, choose its camera and sun settings in the 3D model to image studio before generating views. Keep comparable views together so the client can judge the material decision.

Prepare the handover around those decisions: the selected room views, a Drawing Studio material moodboard, and a panorama or short clip where it helps explain the space. Pro and Pro Plus include board sharing and comments. Check recipient permissions before inviting a client.

For procurement, use current manufacturer specifications and quotes. For installation, use checked model dimensions and the appropriate technical drawings. A photorealistic image alone doesn't establish fit or construction accuracy.

Frequently asked questions

What is the best 3D interior design software?

Formas is a strong starting point for developing interiors from photos, sketches and existing models, then preparing client visuals and material boards. Choose SketchUp for custom geometry, HomeByMe for catalog-led furnishing, or RoomSketcher when the floor-plan handover is central. Match the software to the output you need.

Can I design an interior in 3D for free?

Formas templates are free, and a free account includes starter credits. Sweet Home 3D is a free application for home plans and furnished models. HomeByMe and Planner 5D have free plans with different output and catalog limits. Check whether the free option includes the exports you need for the project.

Can Formas work with a model I already have?

Yes. Its 3D model to image studio imports OBJ, 3DS, GLB, GLTF, STL, 3DM, FBX, PLY, IFC and SKP files and includes orbit/walk navigation, camera views, sun controls and image generation. Formas is also directly integrated with SketchUp. The studio outputs images, not models.

Can a room photo become a 3D model?

Formas describes image-to-3D generation for textured assets. Deconstruct can also extract reusable furniture or objects from an image. An asset, a room panorama and a complete editable room model are different deliverables. Check geometry and dimensions before using generated assets for specification or fabrication.

Can clients walk through a Formas design?

The available routes include a navigable model in the 3D model to image studio, a generated Formas World with browser sharing, a look-around Panorama 360, and video. Choose the route for the client's task and check access and sharing permissions. A panorama rotates the view from one position; a video follows its chosen sequence.

Bring one room photograph, sketch or model and develop the next client decision around it. Open Formas Studio to build the views and material board.