Business

GBrain

Website
Founded 2026Origin source ↗Checked 2026-09-27

Overview

Like ChatGPT or Claude, but it runs in the cloud, remembers everything you give it, and comes loaded with skills. Hand it a job tonight and read the answer in the morning. Use it on your own, or with your whole team.

Company description As recorded 2026-11-08

Founders & team

Previously The Overton Window Company, Gbrain.io, gbrain.io

Company history As recorded 2026-11-08

Brad Gessler

Founder/CEO

Cofounder & CEO Gbrain.io, P26. Cofounder & CTO of Poll Everywhere, S08. More at https://bradgessler.com/

Founder profile As recorded 2026-09-27

Jamison Mercurio

Founder

Co-founder at Gbrain.io (P26). Previously co-founder and CEO of Mango Health (YC W24, AI mental health). Former Meta iOS and web engineer (Messenger Video Chat + Facebook News). Princeton CS Class of 2020.

Founder profile As recorded 2026-09-27
3team members reported
Source-reported As recorded 2026-09-27

Founded 2026 · Source

Origins

The three of us met building Garry's List. Every time we moved between AI tools we pasted the same API keys into the next one and explained the work all over again. No existing tools were built for a team, either. We wanted one thing all three of us could prompt together, which is why gbrain.io is multiplayer. Initially, building this meant the three of us in a room spinning up an agent harness, initializing memory; installing skills, manually setting up integrations to external tools, and pasting API keys in one at a time. After copy-pasting that setup for a bunch of our friends, we built [gbrain.io](http://gbrain.io) for the world: the same thing, in the cloud, that sets itself up in one click.

Founder account As recorded 2026-09-27

News & product activity

Sources & observations

Y Combinator

Profile depthenriched profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceA pricing page was detected
Maturity: Not assessed · 4 of 6 areas documented

Source-based assessment · automated evidence rules

The retained text does not establish product availability or customer use.

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationreachable websitedescriptive evidencesourced peoplesourced founding yearpricing page observeddocumentation observed