300k+people took the test
Ultimate Personality Test
Built a test combining MBTI, Big Five, Enneagram, and a framework we developed. Added personalised AI advice.
Take the testBased in Tallinn, Estonia
André Ferretti.
Software developer.
Product manager.
I build tools that help people understand themselves,
make decisions, and get things done.
I started using GPT-3 through OpenAI’s API in January 2022, 10 months before ChatGPT launched.
Now at
Bolt
Associate Product Manager
One-year graduate program · TallinnSep 2026–Present
Selected work
Clearer Thinking
Jul 2022–Mar 2026
Built tools and ran research across ~20 projects with Spencer Greenberg at Clearer Thinking,
whose psychology newsletter reaches ~400,000 subscribers.
86traits in one assessment
Unique Traits Test
Built an adaptive assessment that asks only relevant questions. Led development from research and validation to the final product.
Explore the test
152astrologers put to the test
Does Astrology Work?
Ran a study asking astrologers to match people to birth charts. Their results were no better than chance.
Read the studyBuilt on my own time
Personal projects
Pact-Man
Negotiate five deal terms with an AI investor. An AI judge scores each round.
Semantic Stock Search
Find stocks by describing what you mean. Even “I’m lovin’ it” finds McDonald’s.
Hair Guard
Your camera spots when you reach for your hair and nudges you to stop. Everything runs on your device.
Urgent Email
An AI bot checks my Gmail hourly and messages me on Telegram when an email needs attention.
Ricasa
Built a renovation cost estimator for the Italian market. Sold it to a small business for $4k.
AI Council
Ask Claude, GPT, Gemini, and Grok the same question. Compare their answers side by side.