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Tweeks.io

YC W25

San Francisco, US · Founded 2025 · 2 employees · 3 known investors

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Tweeks is an AI-powered browser extension that allows users to modify how websites look and behave through natural language descriptions without requiring code. The tool generates custom modifications that run in a sandbox and can be shared across a community of 4,000+ published tweaks.

Also known as NextByte, Inc. · NextByte

AI & Machine LearningDeveloper ToolsEnterprise SoftwareHR TechArtificial IntelligenceConsumerAIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (W25)

Tweeks.io was founded in 2025 by Jason Madeano and Matt Stallone.

JMJason Madeano
Jason MadeanoCo-FounderJason Madeano is co-founder and CEO of Nextbyte. Previously, he worked as a machine learning engineer at Pinterest on recommendation systems for the home feed, and holds degrees in computer science and brain & cognitive science from MIT.
MSMatt Stallone
Matt StalloneFounder & Chief Humor OfficerMatt Stallone co-founded NextByte and previously led post-training work on foundation language models at IBM Research, including the Granite model series. He holds Master's and Bachelor's degrees in Computer Science and Electrical Engineering from MIT and has published research in machine learning.

Investors · 3

Fractalreported

How we know: Y Combinator's founder network · Not right? Tell us

The E14 FundreportedCambridge · $1M – $5M

How we know: Y Combinator's founder network · Not right? Tell us

Related companies · 5

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Aqua VoiceAqua Voice is an AI-powered voice-to-text application that converts speech into refined text in real time for use across apps, from coding to writing and team communication. It serves developers, content creators, and professionals seeking faster typing alternatives with accuracy optimized for technical and natural language contexts.
CandleCandle is a mobile app designed for couples that provides daily games, conversation prompts, date ideas, and shared memory storage to strengthen romantic relationships. The app serves couples of all distances seeking to deepen connection through regular interaction and shared experiences.
T3 ChatT3 Chat builds AI chat software; the company also develops tools for file uploads, image editing, and live collaboration across developer and creator workflows.
DecohereDecohere provides AI-powered content generation tools that create characters, art, and video. The platform serves creative professionals and hobbyists across multiple domains including anime, illustration, interior design, and video production.

Companies working in the same space as Tweeks.io.

Legal entities · 1

corporate structure
NextByte, Inc.

In the news

NextByte - AI recruiter tuned to identify the best vibe codersycombinator.com · Feb 2025

Frequently asked questions

What does Tweeks.io do?
Tweeks is an AI-powered browser extension that allows users to modify how websites look and behave through natural language descriptions without requiring code. The tool generates custom modifications that run in a sandbox and can be shared across a community of 4,000+ published tweaks.
Who founded Tweeks.io?
Tweeks.io was founded by Jason Madeano, Matt Stallone in 2025.
Who are Tweeks.io's investors?
Tweeks.io's investors include Y Combinator, Fractal, The E14 Fund.
Where is Tweeks.io headquartered?
Tweeks.io is headquartered in San Francisco, US.