PromptJuggler: the platform for building on AI

PromptJuggler is a web-based team platform for authoring LLM prompts, wiring them into workflows and agents, evaluating quality, and running the whole thing at production scale. It brings together four tools that usually live in four separate tabs: a prompt editor with templates and versioning, a visual workflow builder with branches, loops and parallel execution, a built-in evaluation harness, and a REST API for triggering runs from your own product. You bring your own API keys for OpenAI, Anthropic, or Google Gemini. PromptJuggler handles the rest: orchestration, versioning, knowledge bases, memory, tools, and all the unglamorous glue work that otherwise eats your engineering week.

Key features

• Prompt authoring with templates, versioning, and one-click switching between GPT, Claude, and Gemini models.

• Visual workflow editor for agents and pipelines: conditions, loops, script nodes, parallel execution, no framework lock-in.

• Built-in knowledge bases for RAG: upload documents, search them at runtime, no embedding pipeline to maintain.

• Evaluation framework: run any prompt or workflow against a dataset, score outputs with assertions, catch regressions before your users do.

• REST API with webhooks for triggering runs, reading results, and tracking token usage and cost.

• Multi-tenant team workspaces with shared prompts, access roles, and usage controls.

How it works

Sign up, add your LLM provider keys, write your first prompt in the editor. Run it, version it, wire it into a workflow if one step isn't enough. When it's ready, call it from your product over the API or have it triggered by a webhook. Everything runs on a dedicated Go execution runtime built for throughput.

Pricing and plans

Free to start. Paid plans for teams and production usage. No per-token markup: your LLM spend goes directly to the provider.

System requirements

Web-based. Runs in any modern browser (Chrome, Firefox, Safari, Edge) on Windows, macOS, and Linux. No install, no local dependencies. Requires an internet connection and an API key from at least one supported provider.

Keywords

prompt management, prompt engineering, LLM orchestration, AI workflow builder, prompt versioning, prompt IDE, AI agent platform, RAG tools, prompt evaluation, LLM evaluation, OpenAI, Anthropic, Claude, GPT, Gemini, prompt templates, AI pipeline, LangChain alternative, PromptLayer alternative, Langfuse alternative