Purple
Mainspring
We build and operate a portfolio of ventures — on our own AI platform.
A portfolio of ventures, on our own AI platform.
Our Portfolio
Ventures we build and operate.
Consumer companies and an enterprise AI platform, built and run on our own systems — measured by outcome, not headcount.
Purple Spoon
Recipes and kitchen tools for people managing lupus and other autoimmune conditions, built by the people who live with them.
Watchbox
A catalog and collection tool for watch enthusiasts, built over a reference library of thousands of watches.
Meridian
Precision supplements built around the body’s daily cycle, designed in-house and made direct from the source.
AI Platform
A measurement and governance platform for AI workforces — cost and accountability by business outcome. Name to be announced.
Promises we can’t quietly walk back.
Four commitments we will write into our legal charter when we incorporate as a Delaware Public Benefit Corporation: public now, permanent on filing, and beyond any future investor’s reach.
Read the full charter-
AI Accountability
AI will always recommend and will never restrict your options or obscure alternatives. AI-generated content is labeled as such.
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Earned Perspective
Every Purple Mainspring subsidiary has advisors who personally live the problem it solves, people who would notice if the product got worse.
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Your Data, Your Terms
Your data is yours, across every product we build. Never shared, sold, or brokered without your explicit, revocable consent.
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The Lupus Pledge
5% of net profits to the Lupus Research Alliance, every year, without exception.
Our Story
Our Story
It starts with Leslie.
One person. One long illness. And a conviction about building for the people the system overlooks.
Our Pledge
We're particular about what we build, and who we work with.
Purple Mainspring builds and operates a portfolio of ventures on its own AI platform — a small team with the output of a much larger one. If you want to work on hard problems with people who care about what they're building, let's talk.
A small team with the output of a much larger one. If you want to work on hard problems with people who care about what they're building, let's talk.
work@purplemainspring.comPurple Mainspring is early-stage and selective about capital. Each subsidiary raises on its own. You back the specific company you believe in, with clean ownership and mission protections built into the structure. If that's the kind of bet you make, let's talk.
Early-stage and selective about capital. Each subsidiary raises on its own. You back the company you believe in, with clean ownership and mission protections built in. If that's the kind of bet you make, let's talk.
investors@purplemainspring.comWe partner with people who bring what we don't: distribution, domain expertise, manufacturing relationships, market access. If there's a real fit between what you do and what we're building, reach out.
We partner with people who bring what we don't: distribution, domain expertise, manufacturing relationships, or market access. If there's a real fit, reach out.
partners@purplemainspring.comPurple Mainspring is a venture studio in The Woodlands, Texas, forming as a Delaware Public Benefit Corporation. Logos, boilerplate, founder bios, and key facts live in our press kit.
A venture studio in The Woodlands, Texas, forming as a Delaware PBC. Logos, boilerplate, and key facts live in our press kit.
hello@purplemainspring.com