# PromptFast

> Iterate on any prompt against any model - without spinning up your entire stack.

- **Website**: https://www.promptfast.dev/
- **Uneed Page**: https://www.uneed.best/tool/promptfast
- **Pricing**: Paid
- **Category**: Development
- **Tags**: AI, Development, Testing
- **Submitted by**: @bakos.soda-8222
- **Launch Date**: 2026-04-15
- **Social Links**: [Twitter](https://x.com/bakszy5)

## About

PromptFast is a subscription-based SaaS playground for prompt engineers and AI developers. It provides an isolated, fast, multi-model environment to test, compare, and track prompts — without touching your application infrastructure.

 - Run a prompt against 13+ models across OpenAI, Anthropic, and Google simultaneously

 - See real-time token-by-token streaming responses

 - Track exact cost per run with model-specific pricing

 - Upload PDFs, CSVs, DOCX files as document context

 - Keep a full history of every experiment, reloadable in one click

 - Compare two models side-by-side with parallel execution