The AI brains you think, write, and research with every day.

Best Think & Research for Founders

General-purpose AI assistants and research tools — the ones founders open every morning to think, write, draft, and find answers.

Updated this month7 tools rankedIndependent editorial

Editor's Pick · Think & Research

Start with Lovable

Our top pick in Think & Research for most founders. Describe the software you wish existed for your business, and Lovable builds and ships a real, working version for you.

Best for
Owners launching their first real software product
Price
Free / $25+
Rating
4.8

Alternative options

Claude Agents

Owners whose work is writing, thinking, and analysis

Read review →

Manus

Owners who want AI to do research while they do other work

Read review →

The full ranking

All 7 tools we tracked, ranked.

Rank#1

Lovable

4.8(2,005)

Describe the software you wish existed for your business, and Lovable builds and ships a real, working version for you.

Best for
Owners launching their first real software product
Price
Free / $25+
  • +Takes you from idea to a product paying customers can actually use
  • +No developer or technical co-founder required
  • +Saves the cost and time of hiring an engineering team
  • Built for web products — not iPhone or Android apps
Rank#2

Claude Agents

4.7(460)

An AI thinking partner that reads, writes, and analyzes long, complex work as carefully as a senior employee would.

Best for
Owners whose work is writing, thinking, and analysis
Price
Free / $20+
  • +Writes in a way that sounds like a real human, not a robot
  • +Reasons through long documents without losing the thread
  • +Flags when it's unsure instead of making things up
  • Connects to fewer outside apps than ChatGPT
Rank#3

Manus

4.5

An AI you point at a question and it actually goes off and does the work — browsing, reading, and writing up the answer for you.

Best for
Owners who want AI to do research while they do other work
Price
$20+
  • +Works on its own without you babysitting it
  • +Reads the live web and pulls back real sources
  • +Hands you a finished output, not just a chat reply
  • Takes longer than a regular AI chat to finish a task
Rank#4

ChatGPT

4.6(1,520)

The one AI that does almost everything — writing, research, image work, planning — for a single $20-a-month bill.

Best for
Owners who want one AI that does it all
Price
Free / $8+
  • +Handles writing, research, planning, and images in one place
  • +The biggest library of plug-ins and connected apps
  • +The easiest AI to start with if you've never used one seriously
  • Will slow you down during peak hours on the cheap plan
Rank#5

Gemini

4.4(810)

Google's AI, plugged directly into Gmail, Docs, Sheets, and Drive — handy if your business already runs on Google.

Best for
Owners whose business lives inside Google Workspace
Price
Free / $5+
  • +Can chew through enormous documents in one go
  • +Sits right inside Gmail, Docs, and Sheets
  • +Strong at images, voice, and video together
  • Long-form writing isn't as polished as Claude's
  • Smaller plug-in library than ChatGPT
Rank#6

Perplexity

4.6(1,580)

AI answer engine that cites real sources for research and recurring market questions.

Best for
Founders doing daily research
Price
Free / $20+
  • +Cites sources on every answer
  • +Live web grounding
  • +Fast for research tasks
  • Weaker for long-form writing than Claude or ChatGPT
  • Less ecosystem than ChatGPT
Rank#7

NotebookLM

4.7(1,230)

Google's research notebook — upload sources and chat, summarize, or generate an AI podcast from them.

Best for
Researchers grounding AI in their own documents
Price
Free / $20+
  • +Grounded in YOUR sources — almost never hallucinates
  • +Audio Overview turns any docs into a podcast
  • +Massive context — drop in 50 PDFs
  • Tied to Google account
  • No general web research
Rank#8

Grok

4.2(500)

xAI's chatbot with real-time access to X (Twitter) and a more permissive personality.

Best for
Founders living on X who want AI grounded in the timeline
Price
Free / $30+
  • +Live X (Twitter) data baked in
  • +Less filtered than other major models
  • +Generous free tier via X Premium
  • Smaller ecosystem than ChatGPT or Claude
  • Reasoning still behind GPT-4 / Claude on hard tasks

Recommended Next Step

Key insight

Editor's Pick in Think & Research: Claude Agents.

Why it matters

We recommend Claude when the quality of the writing is the product. It's the AI we trust with serious work a client will actually read — proposals, memos, contracts, long-form analysis.

See the full Claude Agents profile

Pros, cons, who it's for, who should skip it — and where to start.