Partech puts 10 million euros behind Rayon's plan to move interior design into one browser tab

Added up, Rayon's rounds come to 15.7 million euros: a 1.7 million euro pre-seed in 2022 led by Seedcamp, a 4 million euro seed in September 2023 co-led by Northzone and Foundamental, and this one ^[16][1][1]. About 64% of all the capital the company has raised arrived in the Partech round ^[2]. The team is 40 people ^[17].

The money goes to a 3D mode, more AI in the drawing process and a bigger sales team ^[5]. The first two are the year-end release. The third is the part that has to turn four million drawings ^[2] into invoices, and the announcement, as reported, does not include a valuation, revenue or a count of paying customers.

Interior design software is put at about $6.5 billion in 2026 and $9.7 billion by 2030 ^[15]. That is 49% more over four years, or about 10.5% a year compounded ^[3]. If the incumbents' 42% share ^[11] applies to the 2026 figure, Autodesk, Trimble and Nemetschek take about $2.7 billion between them and everyone else splits roughly $3.8 billion ^[4]. Chaillou calls Rayon's target "the architecture of the 90%", meaning the interior fit-outs, retail build-outs and home renovations that make up most construction projects and get little attention from CAD vendors ^[8]. Rayon is aiming where Autodesk's tools are built for architects and not for interior teams ^[19].

Partech's case rests on scarcity and timing. "Interior design has been underserved by software for decades, and Rayon is the first team we've seen build the design layer this space actually needed rather than retrofitting tools made for architecture," said Réza Malekzadeh, a general partner at Partech ^[21]. "Pairing that foundation with AI at this moment is a genuinely unique window, and we don't expect it to stay open for long," he said ^[18]. Rivals are already in the segment. Snaptrude and Arcol sell browser-based AI tools against the same incumbents, and Snaptrude is backed by Foundamental ^[13], one of Rayon's own seed leads ^[16]. Partech has other design bets as well, including a $3.4 million seed in Modeinspect in January ^[14].

There are three ways this goes differently from the pitch. The year-end release could slip, leaving a 10 million euro round priced on a 2D tool. Snaptrude or Arcol could reach interior studios first. Or an incumbent could repeat Spacemaker, the Oslo startup where Chaillou was an architect and senior data scientist, which Autodesk bought for $240 million in 2020 and folded into Forma ^[6]. For Rayon's founders a repeat would be an exit. For a Series A investor it sets the one priced comparable at $240 million.

I think the drawing count measures use of the current 2D product, and the sales hires are in the budget because that use has yet to show up as cash. The counter-thesis is reasonable: studios already drawing in a browser tab can be sold a 3D mode without migrating files, and the company says a number of its customers are moving off AutoCAD, SketchUp and ArchiCAD ^[20]. I would be wrong if paying studios, counted and named, grow faster after the release than the drawing total does.