# Pure Func

> Pure Func is a small product studio. We design and build sites and software for founders and brands, and help teams modernize their frontends with AI.

Pure Func designs and builds marketing sites and Shopify stores for brands; prototypes, MVPs and lightweight SaaS for founders; audits frontends and sets up AI workflows for product teams; and leads frontend work for early teams, with small AI sessions on a call that teach founders and teams to use AI well. To start a project, a person fills in the form at https://purefunc.io/contact (fields in the brief schema below); the studio receives a written plan. Every page below has a Markdown version.

## Pages

- [Home](https://purefunc.io/index.md): Pure Func is a small product studio. We design and build sites and software for founders and brands, and help teams modernize their frontends with AI.
- [Services](https://purefunc.io/services.md): Sites, Build, Modernize and Lead: the four ways Pure Func helps.
- [Sites: A site that looks like you, loads fast, and search and AI can read.](https://purefunc.io/services/sites.md): Brands, studios and founders who need a marketing site or a store that feels like them. Custom marketing sites and Shopify storefronts, designed with you and built static-first: fast on a phone, easy to update, and readable by search engines and AI assistants.
- [Build: From idea to a product people can use.](https://purefunc.io/services/build.md): Founders who need a working product before they hire engineers. Prototype sprints, MVP builds and lightweight SaaS, built fast with AI. We make the design and architecture decisions and test what matters before it ships.
- [Modernize: Make an older frontend fast again.](https://purefunc.io/services/modernize.md): Product teams whose frontend has fallen behind. A frontend audit with a prioritized fix list, then agents in your repo with review loops and guardrails, so the speed lasts after we leave.
- [Lead: We lead your frontend and teach your team to use AI.](https://purefunc.io/services/lead.md): Founders and early teams who need experienced judgment, on the frontend or on AI, before they can hire for it full time. Part-time frontend leadership for architecture, code review and hiring, and 90-minute calls that teach founders and small teams to use AI to write, plan, prototype and build, without the slop.
- [Work](https://purefunc.io/work.md): Selected case studies, each told as problem, move and outcome.
- [Sentry: Shopify storefront](https://purefunc.io/work/sentry-shop.md): A merch shop and checkout that looks like Sentry, not a template.
- [Level Up Tutorials: Web app features](https://purefunc.io/work/level-up-tutorials.md): Quizzes for students and admin tools for staff, on one learning platform.
- [Rachio: Shopify theme](https://purefunc.io/work/rachio.md): E-commerce woven into the brand site instead of parked beside it.
- [Elemental Living: Marketing site](https://purefunc.io/work/elemental-living.md): A bilingual, photo-heavy studio site that stays fast on a phone.
- [How we think](https://purefunc.io/thinking.md): The name, the drawn mark, color and type with a job, and what we design against.
- [How to spot a site AI made on its own](https://purefunc.io/how-to-spot-ai-made-sites.md): 24 signs a site was left to AI defaults, from gradient headlines to invented praise, with why each one costs you and what to do instead.
- [About](https://purefunc.io/about.md): Pure Func is a small product studio run by Eric Sartorius.
- [Let's talk](https://purefunc.io/contact.md): Tell us about your project. A real person reads every message.
- [Privacy](https://purefunc.io/privacy.md): What Pure Func collects through this site and why: the contact form and cookie-free visit counts. No cookies, no ads, no selling data.
- [Terms](https://purefunc.io/terms.md): Terms for using the Pure Func website: our content, examples, client work and links. Project work has its own written agreement.

## Optional

- [Everything in one file](https://purefunc.io/llms-full.txt)
- [Brief schema](https://purefunc.io/brief.schema.json): the fields a person fills in at /contact to start a project