What we build

Projects

Every product below started as a tool we needed for ourselves. Built and maintained by the same small, independent team — no venture funding, no dark patterns.

PromptCraft logo

PromptCraft

Prompt engineering, done for you

Turn rough ideas into well-structured prompts for any large language model. Free to use, with a side-panel companion for your browser.

  • Optimizes prompts for ChatGPT, Claude, Gemini & more
  • Chat-native interface with history
  • Chrome extension for any AI chat

Also available as a side-panel Chrome extension that works inside any AI chat.

Open the prompt builder
Marseil logo

Marseil

Your docs, answered instantly

Turns your docs, PDFs, and URLs into an AI agent that answers questions instantly — and only from your content. Your knowledge, always on.

  • 0.8s average response, 97.4% accuracy
  • Website widget, Slack, shared link & REST API
  • Answers grounded in your own content

Plans start at $9/mo with a free trial • 20% off for PromptCraft users.

Build your AI agent
AnkhKit logo

AnkhKit

300+ free tools, zero uploads

A privacy-focused hub of everyday tools: image and PDF converters, generators, calculators, and developer utilities. Most run entirely in your browser.

  • Files never leave your device
  • No ads, no sign-up, no watermarks
  • Image, PDF, audio, text & dev categories

Have an idea for a tool we should build?

We ship fast and we read every message. Reach out at johnny@promptcraft.net.