Userfox was founded by Cesar Alaniz, Peter Clark in 2011.

Who are Userfox's investors?

Userfox's investors include 500 Global, Y Combinator, Point Nine.

Where is Userfox headquartered?

Userfox is headquartered in San Francisco, US.

Userfox

DefunctYC W11

San Francisco, US · Founded 2011 · 2 employees · 3 known investors

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userfox is a SaaS product for user retention, sending welcome, inactivity, and custom trigger-based drip emails to help companies keep users engaged. It serves companies looking to improve customer retention through automated email.

Also known as Serious Fox Corp

Enterprise Software Marketing Tech Media & Entertainment SaaS Sales Tech MarketingUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (W11)

Userfox was founded in 2011 by Cesar Alaniz and Peter Clark.

Cesar AlanizCo-founder and CTO2011–2013Cesar Alaniz is head of Compliance Engineering and Technology at Block, overseeing teams working on compliance across the Square and Cash business units. He previously served as Director of Engineering at Weebly and founded Userfox, a Y Combinator S11 company.

Peter Clark Co-Founder & CEO2011–2013Peter Clark has spent over a decade in growth roles, with a focus on B2B companies.

Bjoern ZinssmeisterEngineering2012–2013Founder/CEO at Templarbit

Investors · 3

500 Globallisted by 500 GlobalPalo Alto · $150K

How we know: funding news · open dataset · 500 Global portfolio 2026-08 · Y Combinator's founder network · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · funding news · open dataset · 5k.vc investor directory · Not right? Tell us

Point NinereportedBerlin · $1M – $10M

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

Related companies · 5

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NaytevNaytev offers a social media management tool that lets content teams A/B test videos, articles, and images on Facebook and automatically publish the best-performing version across channels. It targets brands and publishers managing both paid and organic social media.

RankaiRankAI builds AI-powered tools that automatically generate, publish, and optimize web content for SEO ranking and conversion. It serves marketing teams at B2B SaaS and enterprise companies looking to scale organic traffic through programmatic content creation.

PositionalPositional offers an autonomous SEO agent that handles strategy, content creation, and technical SEO across multiple aspects of search optimization. The platform serves companies seeking to automate and scale their organic search marketing efforts.

NavatticNavattic builds interactive product demo software that helps sales teams engage buyers and accelerate deal closure. The platform serves B2B software companies looking to showcase their products to prospects.

Companies working in the same space as Userfox.

Legal entities · 1

corporate structure

Serious Fox Corp

In the news

Vimessa Deadpooled, Founders Launch User Retention Service, Userfox, With $700K From Y Combinator, 500 Startups & More | TechCrunchtechcrunch.com · Feb 2013

Frequently asked questions

What does Userfox do?: userfox is a SaaS product for user retention, sending welcome, inactivity, and custom trigger-based drip emails to help companies keep users engaged. It serves companies looking to improve customer retention through automated email.
Who founded Userfox?: Userfox was founded by Cesar Alaniz, Peter Clark in 2011.
Who are Userfox's investors?: Userfox's investors include 500 Global, Y Combinator, Point Nine.
Where is Userfox headquartered?: Userfox is headquartered in San Francisco, US.