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Based on the price card posted on the website, assuming there’s 4000 active paying customers each paying $300/month, that gets you to $14M/year

Off by an order of magnitude - 1.2M

$300 * 12 months * 4,000 customers = $14M

I'm not saying it's true or not, but the math works. You're (roughly) calculating MRR, not ARR.

My bad

Don't forget to multiply by 12 for yearly revenue.