Rayon raises €10M Series A to bring 3D and AI to interior design
Partech leads a €10 million Series A in Paris-based Rayon, the browser drawing tool for interior designers that has logged four million drawings. Version 4 brings 3D and agentic AI before year-end.
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Founded 2021 · Paris, France
Paris-based Rayon has raised a €10 million Series A led by Partech to bring 3D and agentic AI into its browser-based drawing software for interior designers, with existing investors Northzone, Foundamental and Seedcamp all returning.
Design software is an unforgiving corner of SaaS – the incumbents are entrenched, and switching costs are measured in careers, not months. And yet this is the kind of round I keep waiting for: a Paris fund leading a Paris company’s Series A, with every earlier institutional backer paying up to keep its seat.
One new name on the cap table, and it is the lead
Rayon announced the round on 29 September 2026. Partech leads; Northzone, Foundamental and Seedcamp – the funds behind the company’s €1.7 million pre-seed in 2022 and €4 million seed in September 2023 – all followed on. Total funding now stands at roughly €16 million, per the company, and architect Norman Foster has been among its angel backers since the early rounds.
The money has a precise job. Rayon says it will launch 3D capabilities, build AI deeper into the drawing experience and scale its go-to-market. Version 4, due before the end of 2026, is billed as the release that brings generative tools and agentic AI – assistants that carry out tasks inside a project, in the company’s words – into the same workspace as the drawings themselves.
Four million drawings in a browser tab
Founded in Paris in October 2021 by Bastien Dolla and Stanislas Chaillou, Rayon is CAD that lives entirely in the browser. Designers import PDFs, images and DWG files, draw over them with vector tools, build component libraries, and edit the same plan simultaneously – with specifications and schedules that update as the drawing changes. The team is 35 people, and users have produced more than four million drawings on the platform, both per the company’s announcement.
The wedge is who it serves. Professional CAD was built and priced for architects and engineers; interior designers – the people specifying furniture, finishes and layouts – have mostly borrowed tools designed for someone else. Rayon’s customer list makes the point: Virgin Atlantic draws its airport lounges in it, hostel group CityHub and co-living operator Coloc Housing run feasibility studies in it, and independent studios are swapping decade-old desktop licences for a browser tab.
A $7.59 billion market compounding at 11%
So why does drawing software for a single profession justify a €10 million cheque? Because the niche is not small, and it is growing faster than software at large. Interior design software is a $7.59 billion market worldwide in 2026, forecast to reach $12.86 billion by 2031, an 11.12% CAGR (Mordor Intelligence, 2026).
Our own funding data gives the amount scale. In built-world software, Paris-based Kraaft raised €13 million in 2025 for construction-site messaging, Hamburg’s plancraft €38 million in August 2025 for craft-business software, and earlier this month Bravi raised a $1.8 million seed to put an AI product expert in every field rep’s pocket. A €10 million Series A for the design layer sits squarely in that band – European investors are funding the built environment’s software stack one profession at a time.
The Figma playbook reaches the floor plan
The pattern is hard to miss. Figma proved that moving a design discipline into the browser – multiplayer, no installs, priced per seat – can unbundle a desktop incumbent. Rayon is running that play for the built environment, from Paris rather than San Francisco. The good news is Europe does not need to copy the original to win this category: professional CAD’s incumbents are desktop-era giants, and the profession Rayon serves was never their priority.
Two things are worth watching. Whether Version 4 ships 3D and agentic AI before year-end as promised – roadmaps in design software slip more often than they land – and whether the AI stays inside the drawing, where the company says it is building it, rather than becoming a chatbot bolted onto a canvas. The all-insider round is its own signal: the investors with the most information about this company all chose to buy more of it.
Europe has spent two decades watching its design talent build category leaders on American infrastructure. A Paris team turning interior design’s drawing layer into a browser-native product, financed by European funds at every stage, is the better trade. Watch what ships before year-end.
