I was once subbed, and I was coming back to sub again, and I thought. "You know what? I think I will just buy the lifetime." I thought I remember it being $50-60... not $100. Did the prices go up?

Yes, it increased from 59.99 to 99.99 in November. A lifetime membership is (still) the cheapest in the long run, and your trust in our continued service keeps us improving and keeping the calculator up to date.

We are soon celebrating our 8th anniversary, and that would not happen without the support of premium members! And I hope it's a testament to the fact that we are here to stay and not a shady scam (which wouldn't make any sense, but some seem to think).