Team Collaboration Startups funded by Y Combinator (YC) 2026

Mesmer is Cursor for CTOs. We give founders and CTOs full visibility into their org without drowning in meetings or chasing updates. We are a team of repeat founders and CTOs with 15+ years of experience each, including leading product development togehter at Origin Financial, a fintech started by Mesmer's CEO, as it scaled to 8-figure ARR, 100+ employees and a $400M valuation. Mesmer reached 6-figure ARR within a week of launching and is already live with companies worth over $8B, including Webflow and Origin Financial.

Kestral makes it clear what your customers want most, prioritizes those tasks for highest leverage, and closes the loop with those customers. We (Brian and Bernard) have been close friends since university, and most recently worked together at Asana, leading AI and Authorization efforts. There we realized AI can completely disrupt the $50B Work Management Market, but it required a fresh start. What work we even choose to manage in the first place is critical, and the most important insights from customers are silo-ed in sales/CS while R&D gives their best shot at roadmaps meant to deliver impact. Significant requests sit in a backlog, duplicate asks flood the system, months wasted on "strategic investments". We want to bridge this gap. This message is resonating with heads of sales, heads of product, CEOs, as well as individuals, all trying to make sure the most important things get done, with less wasted effort and more revenue/retention. Kestral works by automatically take in customer data like sales call transcripts & feature request messages and a team of agents: 1. analyze them for actionable takeaways, deal blockers, and nice to haves 2. consolidate them and manage all the asks with citations 3. prioritize them by impact and frequency to cut through the noise so you can see the biggest opportunities clearly 4. connect them to your existing strategic roadmap so when the work gets done, we can automatically follow back up with your customers and win them over This is just step one of our mission to revolutionize how work gets done -- starting with what we choose to work on, and hope you follow us along for the ride!

Solari gives non-technical team members access to agents that work right out of the box.

Affinity is a compliance training platform designed specifically for regulated industries. We’ve previously built a fintech from inception to a successful exit and are leveraging that experience to solve the learning management needs of regulated tech companies from growth stage to large enterprise banks.

Convictional (convictional.com) is the company OS that replaces Slack, to keep teams mission aligned by design. Your goals, email, meetings, chat and knowledge search in one place, where your team's effectiveness compounds.

Mio powers seamless communication between Slack, Microsoft Teams & Webex Teams. The Austin, Texas-based company was founded by Tom Hadfield and James Cundle in November 2015. M.io has raised $12m from investors including Goldcrest Capital, Eniac Ventures, Two Sigma Ventures, Khosla Ventures, Y Combinator and Capital Factory. Ready to sync your teams? Learn more and get started at https://m.io/

Kitemaker is a faster and more collaborative alternative to Jira optimized for remote teams. It's helping teams spend less time and effort on collaboration by providing a place for discussing and documenting initiatives, it collects activities and discussions across tools, and it's fast and simple to use. Unlike tools like Jira and Notion, our primary focus is helping software development teams spend less time coordinating across tools and roles so they have more time figuring out and building the things their users want.

Cocoon actively brings your most important groups closer together. It provides a private space to gather, the tools you need to keep each other close, and helps you keep writing your ongoing story as a unit.

Screenhero lets you screen share any application with anyone, no matter where they are. It's super simple and blazing fast. You each get your own mouse pointer, and you're both always in control. It's designed for collaboration, not just broadcasting your screen. It's like Google Docs for any application on your computer.