📖 The AI Tool Bible

OpenAI

San Francisco, US· founded 2015· series-e+· website ↗

Research and product lab behind ChatGPT, GPT-5, DALL-E, Sora, Codex, and the OpenAI API. Founded by Sam Altman, Greg Brockman, Ilya Sutskever, and others; deeply capitalised by Microsoft. Sets the pace on frontier LLMs for most of the industry.

18 tools in the directory

GPT-4o

Featured
Writing · GPT-4o
9.4

OpenAI's multimodal flagship behind ChatGPT.

Freemium· Free tier; Plus $20/mo; Pro $200/mogeneral writingsummarization

Sora

Featured
Video · Sora
8.8

OpenAI's flagship text-to-video model.

Paid· Bundled with ChatGPT Plus ($20/mo) / Pro ($200/mo)realistic motionnarrative clips

DALL·E 3

Image Generation · DALL·E 3
8.6

OpenAI's image model — strong on prompt adherence and text-in-image.

Freemium· Included in ChatGPT Plus; pay-per-image via APIpostersinfographics

Whisper

Audio · Whisper large-v3
8.6

OpenAI's open-source speech-to-text — the de-facto baseline.

Free· Free open weights; $0.006/min via OpenAI APItranscriptionself-hosted

OpenAI Fine-tuning

Fine-tuning · GPT-4o-mini / GPT-3.5
8.4

Fine-tune GPT-4o-mini and friends on your own data.

Paid· Training $25/1M tokens; inference at standard ratesstyleformat

OpenAI Playground

Writing · Multi-model (GPT-4o, GPT-4.1, o-series, DALL-E, Whisper, TTS)
8.2

OpenAI's official browser sandbox for prompting, tuning, and testing every model on the platform before you ship API code.

Paid· Pay-as-you-go at standard API token rates; no separate Playground feeprompt-engineeringmodel-comparison

OpenAI Evals

Evaluation · OpenAI GPT models (extensible)
8.1

OpenAI's open-source framework for benchmarking LLMs against a shared registry of evaluations.

Free· Free (MIT); you pay OpenAI API costs for eval runsllm-benchmarkingregression-testing

ChatGPT

Writing · GPT-4o, GPT-4.1, o-series reasoning models
8.0

OpenAI's flagship conversational assistant, and the default benchmark every other chatbot is measured against.

Freemium· Free; Plus $20/mo; Pro $200/mo; Team $25-30/user/mo; Enterprise customwritingcoding

OpenAI Swarm

Agents · OpenAI models (designed for, but extensible)
7.4

Lightweight multi-agent orchestration in Python.

Free· Free / open-sourceeducationprototyping

ChatGPT Shortcut

Writing · Multi-model
7.2

Curated, one-click prompt library covering ChatGPT, Claude, Gemini, and DeepSeek across writing, coding, and academic tasks.

Free· Free; open-source on GitHubprompt-libraryprompt-engineering

Promptfoo

Evaluation · Multi-model
7.2

Open-source eval and red-teaming framework for LLM apps, prompts, and RAG pipelines.

Freemium· Open-source free; Enterprise SaaS contact salesllm-evalsred-teaming

YouTube Summary with ChatGPT & Claude

Agents · Multi-model (ChatGPT, Claude, Gemini, Mistral)
7.1

Browser extension that pipes YouTube transcripts, articles, and PDFs into ChatGPT, Claude, Gemini, or Mistral for instant summaries.

Freemium· Free extension; uses your own ChatGPT/Claude/Gemini accountvideo-summarizationtranscript-extraction

Superpower ChatGPT

Agents · GPT (via ChatGPT UI)
7.0

Chrome extension that bolts folders, prompt libraries, and bulk export onto the ChatGPT web UI.

Freemium· Free core features; Pro tier for advanced limitschatgpt-organizationprompt-management

YouTube Summary with ChatGPT & Claude

Writing · Multi-model (ChatGPT, Claude, Gemini, Mistral)
7.0

Browser extension that pipes YouTube transcripts, articles, and PDFs into ChatGPT, Claude, Gemini, or Mistral for instant summaries.

Freemium· Free; optional in-app purchasesyoutube-summarizationarticle-summarization

ChatGPT for Google

Agents · Multi-model (GPT-4, Claude 2, others)
6.9

Browser extension that pipes GPT-4, Claude and other LLM answers into your existing search results page.

Free· Free extension; requires your own accounts with underlying AI providerssearch-augmentationpage-summarization

YouTube Summary & ChatGPT by Glasp

Agents · Multi-model (GPT-3.5, GPT-4, Claude, Mistral, Gemini)
6.9

Chrome extension that surfaces YouTube transcripts and AI-generated video summaries alongside one-click access to ChatGPT.

Freemium· Free with in-app purchasesyoutube-summarizationtranscript-extraction

WebChatGPT

Agents · Multi-model
6.6

Browser extension that grafts live web search results onto ChatGPT (and Claude, Gemini) prompts.

Free· Freeweb-augmented-chatprompt-library

AI Prompt Genius

Writing
6.5

Open-source Chrome extension for building a searchable, tagged library of reusable AI prompts.

Free· Free and open-sourceprompt-libraryprompt-templates