Q: Is this sequence solver free?
A: Yes, it's completely free to use.
Q: What kind of AI is this?
A: It doesn't use generative AI. It's a rule-based program (source here). If your sequence matches multiple types, only one answer is shown.
Q: How do you determine the sequence?
A: For example, for 1, 3, 5, 7,... we check that a₂ - a₁ = 2 and a₃ - a₂ = 2 and so on, and figure out that it's an arithmetic sequence. The program implements these kinds of checks.
Q: I think the result is wrong. How can I report a bug?
A: Please check the home page for my email or Twitter and send me a message with a screenshot.
Q: Which sequences can it recognize?
A: It can recognize several well known sequences (geometric, arithmetic, Fibonacci, etc.). See the source code for details.
Q: Why did you make this?
Over ten years ago I wrote a simple JavaScript version in high school as coding practice. When I created my website I posted it and, since it got some traffic, I improved the UI. The code is on GitHub if you want to tinker with it.
Q: Who are you?
I'm currently doing robotics research in Switzerland (profile here).