Fundraising Fox

Buildbox

YC S26

San Francisco, US · Founded 2026 · 2 employees · 4 known investors

Find your way into Buildbox

1,228 people in our graph share verified history with the Buildbox team — schools, employers, funds. One of them is your warm intro.

Rishi Modiunlockedknows Trishala Jain · together at University of California, Berkeley, Haas School of Business (overlapped)
knows the team · via Cornell
knows the team · via UC Berkeley College of Engineering
knows the team · via MongoDB
×3knows the team · via Netflix
knows the team · via University of California, Berkeley

Buildbox is a platform that detects failed user journeys in AI agents that pass their evals but still fail to help users complete tasks, ranking these failures by business impact. It ties agent failures to outcomes and tests alternative agent behaviors against the same customer task before release.

AI & Machine LearningData & InfrastructureDeveloper ToolsEnterprise SoftwareSaaSAnalyticsAIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S26)

Buildbox was founded in 2026 by Trishala Jain and Mark Nour.

TJTrishala Jain
Trishala Jainin𝕏Co-FounderCo-founder of Buildbox, which detects and ranks failed user journeys in AI agents and tests alternative agent behaviors before release. She previously worked at Google Labs, MongoDB, and AppDynamics, and holds a UC Berkeley M.E.T. degree in EECS and Business.
MNMark Nour
Mark Nourin𝕏Co-FounderCo-founder of Buildbox, which builds a platform for detecting and ranking failed user journeys in AI agents. He previously worked at Netflix and Google Cloud and studied computer science at Berkeley.

Investors · 4

Vela PartnersSan Francisco · $100K – $500K
Y CombinatorSan Francisco · $500K
GaingelsreportedNew York · $200K – $500K
London Venture PartnersreportedLondon

Funding

SEC filings, press & company announcements

$20M disclosed across 1 of 2 rounds · 2021

Source: company announcements and press reports — follow each round's link for the claim.

In the news

Buildbox: Agent analytics for real user outcomesycombinator.com · Aug 2026AppOnboard raises $20m for Buildbox engine | GamesIndustry.bizgamesindustry.biz · Feb 2021Buildbox raises US$20mil so anyone can make the next ‘Pokemon Go’thestar.com.my · Jan 2021Roblox to Delay Listing for Second Time; Buildbox Raises USD$20m - TheGamingEconomy.comthegamingeconomy.exchangewire.com · Jan 2021Buildbox Raises $20 Million so Anyone Can Make the Next Pokemon Go | Financial Postfinancialpost.com · Jan 2021AppOnboard acquires Buildbox - Buildbox | Game Maker | Video Game Softwarebuildbox.com · Jun 2019Buildbox raises US$20mil so anyone can make the next ‘Pokemon Go’ | Nestianews.nestia.com

Frequently asked questions

What does Buildbox do?
Buildbox is a platform that detects failed user journeys in AI agents that pass their evals but still fail to help users complete tasks, ranking these failures by business impact. It ties agent failures to outcomes and tests alternative agent behaviors against the same customer task before release.
Who founded Buildbox?
Buildbox was founded by Trishala Jain, Mark Nour in 2026.
Who are Buildbox's investors?
Buildbox's investors include Vela Partners, Y Combinator, Gaingels, London Venture Partners.
How much funding has Buildbox raised?
Buildbox has disclosed $20M raised across 1 of its 2 known rounds.
Where is Buildbox headquartered?
Buildbox is headquartered in San Francisco, US.