PromptFx is a desktop application and Kotlin library for exploring large language models, testing prompts, building pipelines, and asking questions of your own documents — all in one place.
Find your path
PromptFx serves different audiences. Choose the path that matches your goals.
Download the pre-built application and start asking questions of your own PDFs, Word docs, and text files using state-of-the-art retrieval-augmented generation (RAG).
Get the appUse PromptFx's built-in workbench to craft and compare prompts, experiment with templates, chain LLM calls, run NLP tasks, and benchmark model responses.
Explore the workbenchIntegrate PromptKt into your own Kotlin or JVM project. Use the API for document chunking, embeddings, prompt templates, agent pipelines, and MCP tool integration.
Developer docsCapabilities
A full-featured desktop workbench for AI exploration and document intelligence.
Ask questions across folders of PDFs, DOCX, and text files using semantic embeddings and retrieval-augmented generation.
Author, test, and version prompt templates using Mustache syntax. Browse a built-in prompt library with hundreds of examples.
Chain prompts and API calls into multi-step AI pipelines. Script batch prompt execution and automatic validation.
Works with OpenAI, Google Gemini, and any OpenAI-compatible API. Switch models without changing your workflow.
Translation, summarization, entity extraction, sentiment analysis, and more — all powered by the LLM of your choice.
Generate images with DALL-E and Gemini Imagen, describe images, and transcribe or synthesize speech with Whisper.
Screenshots
Document Q&A — Ask questions across a folder of research papers. Relevant snippets are retrieved and used to formulate the answer.
Prompt Templates — Edit, preview, and run Mustache-based prompt templates with live parameter substitution.
Text & NLP Tasks — Translation, summarization, sentiment analysis, and entity extraction powered by LLMs.