YC Summer 2026 (S26) company

Coasty

The computer-use agent that doesn't break on real software. We will…

b2baiopsdeveloper toolsworkflow automationdeveloper tools44 public signals

About Coasty

Coasty is a computer use agent that does real work inside softwares, companies already run. New web apps, old desktop tools, the legacy systems nobody wants to touch. You hand it a workflow and it owns the outcome. Most agents demo well and break the moment they hit real software. They get 18 steps out of 20 right, misclick once, and everything after is garbage. Coasty catches when it goes off track and fixes itself mid-task instead of starting over. It handles the messy parts, benchmarks never show. Permission dialogs, surprise pop-ups, a modal that steals focus, a page that loads slow. When a vendor pushes an overnight update and moves half the menus, brittle scripts break by morning. Coasty reads the screen instead of recording clicks, so it adapts and keeps going. It also checks its own output and leaves a time-stamped trail you can replay. We won't pretend it gets every task right. Nothing automating this work does. What matters is what happens when something breaks. It catches the mistake, fixes what it can, and flags what it can't so a person can step in. Nothing fails quietly. That's what lets a team trust it on the work where a silent error gets someone fired. We scored 82% on OSWorld, which puts us among the most reliable agents out there. Reliability is the whole product, not a feature.

Public traction evidence

Each signal links to the public source used for attribution.

  1. GitHub

    coasty-ai/open-cowork

    Open-source alternative to Claude Co-Work built by Claude Mythos 5 with BYOK.

  2. X

    We're live on YC S26! Getting into YC was hard. Finding housing in SF? Somehow harder. The real demo day is Craigslist. coasty[dot]ai Nitish Kovuru

    We're live on YC S26! Getting into YC was hard. Finding housing in SF? Somehow harder. The real demo day is Craigslist. coasty[dot]ai Nitish Kovuru

  3. X

    Coasty founder YC S26 announcement

    Founder Prateek Jannu said Coasty is now in Y Combinator S26 and described pushing computer-use for customers, developers, and enterprises.

  4. Hacker News

    Launch HN: Coasty (YC S26) - An API for computer-use agents

    Launch HN: Coasty (YC S26) - An API for computer-use agents

  5. X

    why we're in @ycombinator enterprise rpa breaks every time a screen changes. and half of you are still clicking through sops by hand in 2026. we built @coastyai to fix this. an agent that reads the screen and just does the work. 85.6% on osworld. got a broken bot or a manual Show more

    why we're in @ycombinator enterprise rpa breaks every time a screen changes. and half of you are still clicking through sops by hand in 2026. we built @coastyai to fix this. an agent that reads the screen and just does the work. 85.6% on osworld. got a broken bot or a manual...

  6. X

    You can now run both your tesla and your computer on autopilot using @coastyai , to whoever is stuck in traffic, happy 4th of july! Run your computer on autopilot using coasty[dot]ai

    You can now run both your tesla and your computer on autopilot using @coastyai , to whoever is stuck in traffic, happy 4th of july! Run your computer on autopilot using coasty[dot]ai

  7. X

    Just a lil update! @prateekjannu Excited to join S26!!

    Just a lil update! @prateekjannu Excited to join S26!!

  8. X

    Introducing Coasty, A State-Of-The-Art Computer Using Agent. Run agents without worrying about them deleting files or installing malware, in an Isolated Virtual Machine on our platform. No Session Limits. Starting at $19.99 a month. 0:01 / 0:34

    Introducing Coasty, A State-Of-The-Art Computer Using Agent. Run agents without worrying about them deleting files or installing malware, in an Isolated Virtual Machine on our platform. No Session Limits. Starting at $19.99 a month. 0:01 / 0:34