Viktor, a start-up that builds an AI agent which works like a colleague inside Slack and Microsoft Teams, has raised a $75m Series A led by Accel. The round was announced on 19 May 2026.
Bek Ventures, Kaya VC, Inovo VC and Tenacity Capital also took part, Fortune reported. Angel investors included Slack co-founders Stewart Butterfield and Cal Henderson, Synthesia chief executive Victor Riparbelli, and executives from Google DeepMind, Figma and ElevenLabs. The company did not disclose a valuation.
Accel said that ten weeks after launch, more than 2,000 organisations were using Viktor and it had reached a $15m revenue run rate. Fortune reported that the product launched publicly in February 2026.
“We feel the personal work assistance is really the big third wave of AI adoption that can yield tens of billions of dollars of revenue.”Zhenya Loginov, Partner, Accel
What Viktor does
Viktor sits in a company's Slack or Teams workspace, where anyone can message it, add it to a channel or pick up a thread a colleague started. Accel said it connects to more than 3,000 workplace tools, including Google Drive, Airtable, Notion and Meta Ads, and can analyse business data, prepare reports, build internal tools, write code and edit CRM records. Viktor's own announcement put the number of integrations at more than 3,200.
According to Accel, an average team connects Viktor to more than 30 tools and data sources. Fortune reported that the agent builds a persistent memory of how an organisation operates and can scan public channels to propose workflows it could take over. Viktor offers a free tier, with paid subscriptions based on credit usage.
The company said it was built in Warsaw and Munich by a team that includes six engineers from Meta, Google and Oxford.
The founders
Viktor was founded by Fryderyk (Fryd) Wiatrowski, its chief executive, and Peter Albert, its chief technology officer. The two met as engineers at Meta, Fortune reported. According to Pulse 2, Wiatrowski said the company began in 2023 with a small team that worked through unsuccessful product ideas before finding demand.
Before Viktor, the founders built JaceAI, an email assistant that works inside a user's inbox. Fortune reported that JaceAI still operates as a separate company. Accel said the pair built two earlier versions of the product.
Who invested
Accel partner Zhenya Loginov told Fortune the firm had met the founders several times over two years, but had found their earlier products too niche. He said Accel had been looking for an assistant built for teams rather than individuals.
Viktor's own announcement listed further backers, including the founders of Framer, ElevenLabs, Vercel, Deel, Instacart and Sana, as well as 20VC's Harry Stebbings, Lenny Rachitsky, Daniel Gross and Nat Friedman.
A crowded market for AI agents at work
Viktor competes with large software companies building their own workplace agents. Fortune noted that Salesforce, which owns Slack, sells its Agentforce product, which can work inside Slack, and that Microsoft has been adding Copilot to Teams and its Office suite. Those companies can bundle assistants into existing enterprise contracts.
Loginov told Fortune that he expects the market to support many companies serving different parts of it.
Company website: viktor.com