Which Free IQ Test is the Most Reliable and Instant?

I'm exploring various free IQ tests available online and would like to gather opinions from the community. Here are some options I've come across:
IQTest.com: This website offers a scientifically valid and reliable IQ test that can be taken on any desktop, laptop, tablet, or phone. The test is free and reflects the best research available. You can also receive an optional extensive analysis of your score, reporting your performance in 13 different areas of intelligence and revealing your key cognitive strengths and weaknesses. Developed by PhDs and statistically sound, this test is now available to everyone 1.
BMI Free IQ Test: This website offers a free IQ test that is instant and does not require an email address. The test is designed to measure your intelligence quotient and provide a score that reflects your cognitive abilities 2.
MentalUP.co Free IQ Test: This website offers a free IQ test that is designed to measure your cognitive abilities and provide a score that reflects your intelligence quotient. The test is instant and does not require an email address 2.
123test.com IQ test: This website offers a free IQ test that is designed to measure your cognitive abilities and provide a score that reflects your intelligence quotient. The test is instant and does not require an email address 2.
IQtestfree.io: Uncover the depths of your intellectual prowess with meticulously crafted IQ test – a testament to excellence in cognitive science. Take iq test free in 20 min. Crafted by top-tier professors and experts in the field, IQ test free guarantees swift and precise results, providing insight into your mental acuity within moments.
A free and certified IQ test designed to test how smart you are within minutes. Take the test, get instant results, and discover your IQ score without registration.