Y Bombinator

Name: Y Bombinator
Brand: Y

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Audit your startup application for Y Combinator with AI-powered insights from experienced founders.

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Tracked since2026

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The Bottom Line

Entry price

Free plan available, paid tiers above

Biggest pro

Leverages experience of YC alumni (including those who failed)

Biggest con

Not an official YC verdict, independent audit only

TL;DR - Y Bombinator

AI agent to audit Y Combinator applications.
Provides founder-score, market validation, and competitor flagging.
Offers 1:1 mentoring for high-scoring applications.

Pricing: Free plan available

Best for: Growing teams

What is Y Bombinator?

Editorial review

Y-Bombinator is an AI agent, powered by 100x.bot, designed to help startup founders evaluate their Y Combinator application. It provides a clear audit based on criteria derived from the experience of founders who have previously applied to YC, including those who "bombed" multiple times. The tool aims to increase applicants' chances of acceptance by identifying potential weaknesses in their application. The agent works by having users install a Chrome Agent and then run a specific prompt with their startup's details. It then calculates a "founder-score," validates market math, and flags competing YC startups to predict the application's chances. The service is particularly targeted at YC Spring 2026 applicants and offers a 1:1 mentoring session for those who achieve a score above 75%.

Available on: Chrome

LCLouis CorneloupUpdated May 26, 2026 · how we evaluateSourceybombinator.site ↗

Pros & Cons

Pros

Leverages experience of YC alumni (including those who failed)
Provides structured feedback on application strength
Streamlined workflow via Chrome Agent
Potential for 1:1 mentorship
Free credits for community engagement

Cons

Not an official YC verdict, independent audit only
Accuracy stated as 50% to YC's criteria
Requires installation of a Chrome Agent

Preview

Key Features

AI-powered application auditFounder-score calculationMarket math validationIdentification of competing YC startupsPrediction of application chances1:1 mentoring session for high scoresChrome Agent installation for streamlined workflowFree credits for sharing

Pricing

Freemium

Y Bombinator offers a generous free tier with optional paid upgrades for advanced features.

View pricing

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Y Bombinator FAQ

What specific criteria does Y-Bombinator use to evaluate a YC application?

Y-Bombinator calculates a founder-score, validates the market math presented in the application, and identifies competing YC startups. These factors are used to predict the application's chances of success.

How does Y-Bombinator provide its audit reports?

The audit reports are generated by a 100x Bot Chrome Agent. Users install this agent and then run a specific prompt with their startup's details to receive the audit.

What happens if an application receives a score above 75% from Y-Bombinator?

If an application scores above 75%, the Y-Bombinator team will reach out to the founders to offer a 1:1 mentoring session. This provides personalized guidance based on the strong audit results.

Is Y-Bombinator officially affiliated with Y Combinator?

No, Y-Bombinator is not an official YC product. The reports are independent audits generated by 100x.bot, based on the experiences of YC alumni.

How can users earn free credits for the Y-Bombinator agent?

Users can earn free credits by sharing the tool online and tagging the creators. This helps ensure the agent continues to run for them.

Source: ybombinator.site

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