Blaxel YC Application

Spring 2025Active

Blaxel went through Y Combinator in the Spring 2025 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Spring 2025
Industry: B2B
Team size: 8
Status: Active
Launched: 2025

Founders

Paul SinaïCEO & Co-Founder
Thomas CrochetFounder
Charles DrappierFounder
Mathis JoffreFounder
Nicolas LecomteFounder
Christophe PloujouxFounder

What Blaxel does

Blaxel is the perpetual sandbox platform for AI agents that need to run code fast. Unlike traditional sandboxes that expire or suffer from cold starts, our sandboxes automatically scale to zero after 1s of inactivity and resume in under 25ms with full memory state preserved - allowing you to keep millions of secure sandboxes on standby indefinitely. We also co-locate your agent logic alongside these sandboxes to eliminate network overhead, delivering near-instant latency for end users.

Blaxel's YC application, reconstructed

Y Combinator application

Blaxel, Spring 2025 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Blaxel

Describe what your company does in 50 characters or less.

The perpetual sandbox platform

What is your company going to make? Please describe your product and what it does or will do.

We built a sandbox platform for AI agents that run code. Unlike typical sandboxes that either expire or have slow cold starts, ours scales down to zero in 1 second and comes back online in under 25 milliseconds with the full memory state intact. This allows developers to keep millions of secure sandboxes ready indefinitely, eliminating cold start delays. We also run agent logic alongside the sandboxes to cut out network latency, delivering near-instant response times.

Where do you live now, and where would the company be based after YC?

We all currently live in San Francisco, and the company will be based in San Francisco after YC.

Explain your decision regarding location.

San Francisco is where our team lives and where most AI and cloud infrastructure innovation happens. It's the natural place for recruiting and meeting early users in developer tools and AI infrastructure.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Blaxel YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Blaxel's public data (launch notes, founder backgrounds, product description). It shows how a company like Blaxel would present itself to YC, not the text they submitted.