Whitespace.
See who already built your idea — and the space they left open.

CLUSTER MODELS-PROMPTS-WEB · 31 ENTRIES · EARLIEST ENTRY 2025-02-23

AI prompt engineering tools

The cluster consists of web-based tools for creating, refining, testing, and optimizing prompts for AI models, including enhancers, evaluators, playgrounds, and libraries, with some targeting specific AI development platforms. The dated entry history shows a steady stream of new products from February 2025 through June 2026, with peaks of 5 entries in June 2025 and 3 in January 2026. The products with the highest activity signal are cotor.ia, cargarge-admin-2, and PROMPT-GENIE1, each showing 0 stars.

Entry timeline

ENTRY TIMELINE

FEB 2025: 1MAR 2025: 2APR 2025: 1JUN 2025: 2DEC 2025: 1JAN 2026: 3FEB 2026: 1MAR 2026: 1MAY 2026: 1JUN 2026: 1AUG 2026: 8SEP 2026: 7OCT 2026: 2
FEB 2025OCT 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 11 ai-built · 9 unlabelled

Operator · 10 hobby · 2 indie · 1 open source · 7 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 20 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01prison2★3 days—hobbyWeb app that turns a natural-language request into a verified prompt tailored to a chosen AI model, with models competing in a 3D arena.
  2. 02promptcraft1★16 days—hobbyAI prompt optimization web app that rewrites prompts via multiple large language models and displays side-by-side comparisons.
  3. 03VibePilot-0★6 days—Web app that evaluates prompts for AI coding tools, scores them against a rubric, and rewrites them into improved, assumption-checked prompts.
  4. 04cotor.ia0★19 daysliveindieAn AI-powered tool that helps users create, optimize, test, and organize prompts for AI models.
  5. 05prompt-engineering-playground0★25 days—hobbyWeb application that lets users test prompt techniques, tune model parameters, compare responses, and manage reusable prompts.
  6. 06Prompt-Optimizer0★25 days—ai-builthobbyWeb app that refines and improves user prompts for AI models to produce better outputs.
  7. 07qiofly0★19 days—Web app that enhances AI prompts by asking clarifying questions and providing improved prompt suggestions with explanations.
  8. 08cargarge-admin-20★1 mo—Admin web app that lets staff manage and evaluate backend AI prompts, with versioned editing and configurable model providers.
  9. 09PROMPT-GENIE10★1 moliveai-builthobbyWeb app that generates and refines prompts for AI models based on user-provided topics or goals.
  10. 10prompt-enhancer-nextjs0★2 molivehobbyAI prompt enhancer that turns rough ideas into clear, structured prompts for various AI models.
  11. 11Prompt_Easy1★8 mostaleliveai-builthobbyWeb app that helps users write and refine prompts for AI models to get better results.
  12. 12prompt-optimizer0★3 mo—Web tool that runs user prompts through AI models to diagnose weaknesses and suggest improved versions for better responses.
  13. 13Prompt-Generator0★5 moliveai-builtWeb tool that helps users generate and refine prompts for AI models to improve response quality.
  14. 14prompt-craft-ai-studio1★1 yrabandoned—ai-builtAI-powered studio for creating and refining prompts for AI models.
  15. 15PromptKit0★6 mostaleliveai-builtindieWeb app that transforms rough ideas into structured, persona-tailored prompts optimized for different AI models and use cases.
  16. 16promptmasteer10★7 mostaleliveai-builthobbyWeb app that helps users write, test, and refine prompts for AI models to improve output quality.
  17. 17prompt-assessor-dev0★8 mostale—ai-builtWeb tool that evaluates and scores user-submitted prompts for clarity, quality, and effectiveness before use in AI systems.
  18. 18tuffprompts0★9 mostaleliveai-builthobbyWeb app that offers a curated library of prompts for use with AI models.
  19. 19dedevs-prompter0★10 mostaleliveai-builtopen sourceWeb app that enhances prompts to create optimal AI responses and save tokens.
  20. 20prompt-generation-0★1 yrabandonedliveai-builthobbyWeb tool that generates prompts for AI models based on a user's topic or requirement.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.