AI/ML$20K-100K MRRMedium competition1-3 Monthstrending

PromptBench

Automated regression testing for LLM prompts.

● The Problem

Every prompt change is a gamble. Teams tweak a system prompt to fix one edge case and break three others. There is no CI/CD for prompts. No test suite. No way to know if your prompt got better or worse.

● The Solution

A testing platform for LLM prompts. Define test cases with expected outputs, run them against prompt versions, and get a pass/fail report. Integrates with CI so prompt changes are tested like code.

Key Signals

MRR Potential

$20K-100K

Competition

Medium

Build Time

1-3 Months

Search Trend

rising

Market Timing

Every company shipping LLM features is discovering that prompt engineering without testing is unsustainable.

MVP Feature List

1Test case editor
2Multi-model support (OpenAI, Anthropic)
3Assertion types (contains, regex, semantic similarity)
4CI/CD integration
5Prompt version diffing

Suggested Tech Stack

Next.jsPostgreSQLOpenAI APIAnthropic APIGitHub Actions

Build It with AI

Copy a prompt into your favorite AI code generator to start building PromptBench in minutes.

Replit Agent

Full-stack MVP app

Build a full-stack MVP for "PromptBench". PRODUCT Automated regression testing for LLM prompts.

Bolt.new

Next.js prototype

Create a working prototype of "PromptBench". OVERVIEW Automated regression testing for LLM prompts.

v0 by Vercel

Marketing landing page

Design a high-converting marketing landing page for "PromptBench". PRODUCT PromptBench: Automated regression testing for LLM prompts.

Go-to-Market Strategy

Free tier for individual developers. Write about "prompt regression testing" to own the SEO category. Partner with AI bootcamps and course creators. Target teams already using LLM APIs in production.

Target Audience

AI EngineersProduct Teams with LLM FeaturesML Engineers

Monetization

Usage-Based

Competitive Landscape

Promptfoo is open-source but CLI-only. Braintrust and Humanloop offer evals but are expensive platforms. Space for a focused, affordable testing tool.

Why Now?

LLM features shipped fast in 2024-2025. Now teams are paying the maintenance cost of untested prompts. Testing is shifting from nice-to-have to required.