# Prompt optimization

Capability · https://godooo.ai/en/capability/prompt-engineering

> Prompt optimization: 6 AI tools in this graph can do it, including prompts.chat, DSPy, Fabric, Prompt Optimizer and Langfuse.

Write, test and improve prompts, by hand or automatically.

- **Takes in:** Text
- **Gives out:** Text

## Tools that do it

| Tool | Type | How well | Pricing | Open source | How you run it |
| --- | --- | --- | --- | --- | --- |
| [prompts.chat](https://godooo.ai/en/product/prompts-chat) | Product | main job* | Open source, free | Yes | Web, Self-host, API, Terminal |
| [DSPy](https://godooo.ai/en/framework/dspy) | Framework | main job* |  | Yes | API, Self-host, Runs offline |
| [Fabric](https://godooo.ai/en/cli/fabric) | CLI | main job* |  | Yes | Terminal, API, Self-host |
| [Prompt Optimizer](https://godooo.ai/en/product/prompt-optimizer) | Product | main job* | Open source, free | Yes | Web, Desktop, Browser extension, Self-host |
| [Langfuse](https://godooo.ai/en/product/langfuse) | Product | supported* | Open source, free | Yes | Web, Self-host, API |
| [Phoenix](https://godooo.ai/en/framework/phoenix) | Framework | supported* |  | Yes | Self-host, Runs offline, API, Terminal |

\* proposed by a machine, awaiting calibration

## Questions

### What is Prompt optimization?

Write, test and improve prompts, by hand or automatically. Prompt optimization: 6 AI tools in this graph can do it, including prompts.chat, DSPy, Fabric, Prompt Optimizer and Langfuse.

### Which tools are built for “Prompt optimization”?

prompts.chat, DSPy, Fabric and Prompt Optimizer.

### Are there free tools for “Prompt optimization”?

prompts.chat, DSPy, Fabric, Prompt Optimizer, Langfuse and Phoenix.

### Which open-source tools can do “Prompt optimization”?

prompts.chat, DSPy, Fabric, Prompt Optimizer, Langfuse and Phoenix.

### Which tools for “Prompt optimization” run offline?

DSPy and Phoenix.

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Last updated 2026-09-24 · Markdown version of https://godooo.ai/en/capability/prompt-engineering. Every page on this site has one: add .md to its address.