Funding announcement · June 3, 2026
Sono raises $1.5M so no one waits on hold again
Sono has closed a $1.5M pre-seed round led by Maki.vc, with Wave Ventures and Failup Ventures, and joined Founders House Helsinki — fuelling voice AI agents that answer every call as we scale across the Nordics and Europe.
$1.5M
Pre-seed raised
35,000+
Calls handled
15
Customers
3
Countries
50%+
Monthly growth
100%
EU-hosted
The launch, in 90 seconds
Why we're building Sono
The phone is still a critical channel for customer service — yet in many organisations a large share of calls go unanswered at peak times. That weakens the customer experience and turns into lost revenue.
Sono makes it possible to automate more complex customer conversations end-to-end — in a way that wasn't technically possible just a year ago. Our platform combines speech recognition, large language models, and companies' existing backend systems into a single layer that can handle a customer-service process from start to finish.
Our agents book appointments, route calls to the right person, answer frequently asked questions, and run customer-satisfaction surveys — built specifically for high-volume environments and slotting into the systems a company already runs. Inbound or outbound, every call gets handled.
“Our goal is simple: no customer should ever have to wait on hold again. We automate routine calls so people can focus on the complex tasks that need human judgment — and that improves both the customer experience and the meaningfulness of the work.”
Backed by leading European investors
“Companies still lose a significant number of customers and sales opportunities simply because they can't answer every call fast enough. Sono solves this with technology that helps companies automate high-volume customer interactions efficiently and at high quality. We believe Sono has the potential to set a new standard for how companies handle customer service and sales over voice channels in Europe.”
From our customers
“Sono won us over with determined execution and the ability to build future-facing services that are easy for end users to understand. The collaboration has been smooth, and everything has been handled professionally and exactly as agreed.”
What's next
The new funding goes primarily into product development and international expansion — so more businesses can answer every call without growing their teams.
Expanding to Sweden & Europe
We've opened an office in Stockholm and are scaling from Finland into Sweden and the wider European market.
From automotive to new industries
Strong in automotive customer service today, we've already expanded into property management and sales use cases — with more to come.
Service and proactive sales
We're building agents for both customer support and active, outbound sales — handling high-volume conversations at quality.
The people building Sono
Founded in Helsinki in 2025 by serial entrepreneurs — and growing. We're hiring.
Second-time AI founder,
ex-VC
Third-time founder,
ex-Swappie
10+ years of engineering experience, ex-AI founder
10+ years of engineering experience, ex-Voice AI founder
10+ years of startup experience, 2-time founder
Press & media
For interviews, logos, and team photos, download the media kit or contact us directly.
Download the media kitAbout Sono
Sono (Closio Oy) is a technology company founded in Helsinki in 2025, building AI-powered phone assistants for customer service and sales. Its solutions automate high-volume call tasks and integrate directly with customers' existing systems — so customer contacts are handled fast and without delays.
Try Sono now
Hear Sono for yourself.
In seconds.
Drop your number and Sono will call you back right now. No form-filling, no scheduling — just a real conversation with the assistant.
Sono is calling you shortly.
Keep your phone close — you'll receive a call from Sono in the next minute or two. Answer it and have a real conversation with the assistant.