The everyday AI assistants worth having open in a tab — chat, research, writing and document help, free to start with no credit card.
🏆NotebookLM
100% Free100 notebooks, 50 chats + 3 audio overviews/day
Upload your own documents and get a grounded research assistant, plus one-click audio overviews — completely free with a Google account.
If you outgrow the free tier: NotebookLM Plus comes bundled into Google AI Pro ($19.99/mo) or Google Workspace plans — adds more notebooks, more daily queries and team sharing.
Visit NotebookLM→DeepSeek
100% FreeFree, hosted web/app chat at chat.deepseek.com — no card, no published message cap (may respond slower under heavy load)
A genuinely free, unmetered chat assistant you can use right now at chat.deepseek.com — just sign up, no card, no subscription tier at all (unlike ChatGPT/Claude, there's no "DeepSeek Plus"). Heavy global traffic can slow responses at peak times, but there's no hard usage cap. Its underlying model is also open-weight, so developers can separately choose to self-host it — but that's not required for normal use.
If you outgrow the free tier: No consumer subscription tier exists. Developers only pay if they use DeepSeek's API directly (pay-per-token) instead of the free chat app.
Visit DeepSeek→ChatGPT
Free planFree tier, rolling daily/hourly message limits (web + desktop app)
The default AI assistant for everyday productivity — writing, planning, research and coding help, available both as a web app (cloud) and a native desktop app for Mac/Windows (local, always-on access without a browser tab).
If you outgrow the free tier: ChatGPT Plus $20/mo removes most limits and unlocks advanced models (see "AI Tools Worth Paying For" below).
Visit ChatGPT→Claude
Free planFree tier, resets on a rolling 5-hour window (web + desktop app)
The strongest free assistant for long documents and careful writing — paste an entire business plan and get thoughtful feedback, available both as a web app (cloud) and a native desktop app for Mac/Windows (local, no browser tab needed).
If you outgrow the free tier: Claude Pro $20/mo for much higher usage limits (see "AI Tools Worth Paying For" below).
Visit Claude→Google Gemini
Free planFree tier, rolling 5-hour usage window
A strong free ChatGPT alternative with deep multimodal and image-generation features, backed by a Google account only — cloud web app, no desktop install.
If you outgrow the free tier: Bundled into Google AI plans, not sold separately (see "AI Tools Worth Paying For" below for Google AI Pro).
Visit Google Gemini→Perplexity
Free planUnlimited standard search + 5 Pro searches/day
AI search with citations — unlimited standard search plus a handful of free Pro searches every day to verify competitors and market data.
If you outgrow the free tier: Pro $20/mo (or $10/mo for verified students), Max $200/mo for the heaviest research use.
Visit Perplexity→Grok
Free planFree tier on grok.com and X with daily message limits, ~128K context, basic real-time search and voice mode
A fast, opinionated chat assistant with live access to X/web search and a genuinely free daily tier — handy for quick research or checking real-time conversation trends alongside your other assistants.
If you outgrow the free tier: SuperGrok ~$30/mo unlocks the full Grok 4 model, DeepSearch and a larger context window; SuperGrok Heavy ~$300/mo adds the multi-agent Grok 4 Heavy tier. Note: free image/video generation via Grok Imagine was removed as of 2026-03-19 — that now requires a paid plan.
Visit Grok→