Free online IQ test: how it works and whether it's reliable

Updated October 26, 2026 · QI Agora team

Taking an online IQ test is the quickest way to get an idea of your logical reasoning, memory and spatial skills. On QI Agora, the test is free, works on your phone and shows your result as soon as you finish.

What QI Agora's online IQ test is like

• 40 questions in the free test, in up to 30 minutes.
• Six areas: sequences, matrices, numerical reasoning, memory, spatial reasoning and logic.
• New questions every test, generated on the spot from mathematical rules.
• Increasing difficulty: it starts easy and gets tougher.
• Time per question: each one has its own timer.

Is an online IQ test reliable?

It depends on how it's built. Many tests online always show the same 20 questions and give everyone high scores because they want to sell something. QI Agora takes a different path:

• it uses Item Response Theory, where each question has a difficulty and getting a hard one right counts more;
• it recalibrates the scale with real data from the people who take the test;
• it flags tests with signs of outside help, such as leaving the screen repeatedly.

Even so, every online test is unsupervised: the result is an estimate for self-knowledge and does not replace an assessment by a psychologist.

How much does it cost?

The test is free and shows your estimated IQ, range, correct answers and time. If you want, for a small fee you can unlock the answer key, the report by area and the certificate with QR code, or take the full 70-question test. Paid extras are charged in Brazilian reais (R$). See all prices.

Do I need to sign up?

Not to start. At the end, you enter your email, get a code and create a password. That way your result is saved in My tests and you can come back whenever you like.

Can I share my result?

Yes. QI Agora creates a ready-made image of your result for WhatsApp, Instagram, Facebook, X and LinkedIn, with your name shown the way you choose (full, first name only or no name). If you have the certificate, you can add it to your LinkedIn profile.