Promptmetheus

Promptmetheus is a web-based prompt engineering IDE for composing, testing, and optimizing prompts for LLM-powered apps, agents, and workflows.

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Overview

Promptmetheus is a prompt engineering IDE for teams and individual builders working on LLM-powered applications, agents, workflows, and automations. It is designed to help users compose prompts, test reliability, and optimize performance in one workspace.

The product centers on structured prompt composition, evaluation, and collaboration. The site describes private workspaces for individual users, shared workspaces for team accounts, and a shared prompt library for real-time collaboration on prompt engineering projects.

Features

Structured prompt composition

Build prompts from structured sections such as Context, Task, Instructions, Samples, and Primer so you can iterate on specific parts instead of rewriting everything at once.

Prompt variables

Define variables at the project or prompt level to keep recurring values flexible and consistent across prompts and datasets.

Prompt evaluators

Create custom evaluators and automatically validate each completion against the constraints you set.

Testing and evaluation tools

Test prompts against datasets, completion ratings, and visual statistics to compare outputs under different inputs and conditions.

Full traceability

Track prompt changes with detailed versioning and changelogs so you can trace how outputs evolved over time.

Data export

Export prompts and completions in `.txt`, `.csv`, `.xlsx`, or `.json` formats for reuse and analysis.

Use Cases

Drafting structured prompts
Compose prompts from reusable sections, adjust different variants, and keep recurring values consistent with prompt-level or project-level variables.
Testing prompt reliability
Run datasets, completion ratings, and custom evaluators to compare outputs and check whether a prompt meets your requirements.
Optimizing agent workflows
Refine prompt chains for agents and other multi-step workflows where errors can compound across the sequence.
Collaborating on prompt projects
Work in a private workspace as an individual or switch to a team account for shared workspaces, real-time sync, and a shared prompt library.
Sharing and reusing outputs
Export prompts and completions to `.txt`, `.csv`, `.xlsx`, or `.json` when you need to analyze or reuse results outside the app.

Pros and Cons

Pros

Supports prompt composition, evaluation, optimization, and collaboration in a single IDE.
Offers access to 15 APIs and 150+ LLMs, with a model catalog and an LLM index for reference.
Includes structured prompt blocks, datasets, ratings, versioning, and changelogs for iterative work.
Team accounts provide shared workspaces and real-time collaboration, while individual users can keep private workspaces.
Provides export options in several common file formats and documented support channels.

Cons

The pricing page at `/pricing` returns a 404, so pricing details are presented on the home page rather than on a dedicated pricing page.
Subscriptions do not include inference budget, so users need to supply their own API keys.
The site does not list every integration or automation connector in the evidence provided, so some workflow compatibility details remain unclear.

FAQ

What is Promptmetheus used for?

Promptmetheus is a prompt engineering IDE for composing, testing, and optimizing prompts for LLM-powered applications, agents, and workflows. It also supports prompt versioning, automatic evaluations, and collaboration features.

Which models can I test with it?

The home page says Promptmetheus supports testing prompts with 15 APIs and 150+ LLMs, and its LLM Index lists supported providers and models. The platform also allows connecting any model compatible with the OpenAI API or LiteLLM SDK.

Can teams collaborate in Promptmetheus?

Team accounts include shared workspaces for real-time collaboration and a shared prompt library. Private workspaces are also available for individual users.

How does billing work?

The support page says you can cancel a subscription from the account menu through Manage subscription, and invoices are available in the Stripe billing portal. The pricing details on the home page also note that subscriptions do not include inference budget, so you provide your own API keys.

How do I get support or move data between products?

The support page directs users to documentation and troubleshooting for technical issues, and also offers help by email and Discord. It also notes that data can be migrated from Forge to Archery by exporting from Forge and importing the project into Archery.

Quick Facts

Category: Prompt engineering IDE
Primary users: Individuals and teams building LLM prompts, agents, and workflows
Platform: Web app
Source domain: promptmetheus.com
Pricing: Free Playground; Single from $29/month; Team from $99/month; subscriptions require user-provided API keys