Y-Bombinator

What is Y-Bombinator?

Y-Bombinator is a YC application audit agent built using 100x.bot. It’s designed for YC Spring 2026 applicants who want an independent check of their application before they submit—specifically to assess how their application aligns with YC criteria and where their strengths and weaknesses may be.

The agent generates an audit report by computing a “founder-score,” validating the market math, and flagging competing YC startups to estimate chances. The site also emphasizes that the output is not an official YC decision.

Key Features

• Agent-based application audit (100x.bot): Produces an independent report using the 100x.bot workflow.
• Founder score calculation: Generates a founder-focused score intended to help users gauge readiness.
• Market math validation: Reviews the “market math” in the application details you provide.
• Competing YC startup flagging: Identifies relevant competing YC startups to inform a chance prediction.
• Chrome workflow via 100x Bot Chrome Agent: Uses a Chrome agent installation to streamline the audit process without requiring a heavy dedicated browser.

How to Use Y-Bombinator

1. Install the 100x Bot Chrome Agent from the site’s provided install link.
2. Run the audit prompt in the agent: execute @workflow:y-bombinator/audit-application.
3. Enter your startup details in the pop-up form that appears after running the prompt.
4. Review the generated audit report for the founder-score, market math checks, and flagged competing YC startups.

If you later want ongoing access (as described on the site), the page also mentions sharing for free credits.

Use Cases

• Before submitting a YC application: Use the audit to identify potential gaps in founder positioning or weak points in market math before finalizing answers.
• Teams seeking internal alignment: Share the report with co-founders to discuss what to strengthen in the application and why certain areas were flagged.
• Applicants who want a structured self-check: Get a systematic review rather than relying only on informal feedback.
• Founders validating competitive context: Use the “competing YC startup” flags to understand where similar startups may set expectations.
• Applicants iterating multiple times: Run the agent again after updating details to see how changes affect the audit output.

FAQ

Is Y-Bombinator an official YC verdict? No. The site states the reports are independent audits generated by 100x.bot based on the experience of YC alumni, not official YC outcomes.

Who is Y-Bombinator for? It’s positioned for YC Spring 2026 applicants who want an internal, confidence-building audit of their application.

What inputs does the agent use? The agent prompts you to add your startup’s details in a pop-up form when you run execute @workflow:y-bombinator/audit-application.

What does the audit check? According to the page, it calculates a founder-score, validates market math, and flags competing YC startups to predict chances.

How do I start using it? Install the 100x Bot Chrome Agent, run the workflow command, and submit your startup details via the pop-up form.

Alternatives

• YC application mentorship or coaching: Human review services can provide feedback on narrative, positioning, and fit; unlike Y-Bombinator, they aren’t limited to an agent’s score/math/flag outputs.
• General-purpose AI resume/application reviewers: Tools that critique writing or structure can help with clarity, but may not perform the same market-math validation and YC-specific competitive flagging described here.
• Startup pitch/strategy review platforms: These focus on go-to-market, pitch clarity, and investor readiness; they may overlap with “market math” checks but typically don’t follow YC application criteria.
• In-house peer review (founder-to-founder): Informal feedback from experienced founders can be useful for context and nuance, though it may not provide a consistent, audit-style report.