Dan Nesthus 0
Sunday, November 9, 2025
App requires a $6.99 Subscription before you can even try it out. It may work, but I'm not willing to buy it when there are free apps and websites.
Octane Studio
Wednesday, May 20, 2026
I'll look in to a free trial period. It is $6.99/year (not month). There are absolutely zero free apps or sites that let you accurately compute OCTANE of a blend as it a very difficult problem mathematically.
Jordan Crowe 0
Saturday, October 11, 2025
Subscription for a basic calculator??
Marshall Loewenstein 0
Tuesday, January 13, 2026
Unique capability that doesn't really exist anywhere to get a precise octane mixture. Tests spot on for Ethanol with my inline sensor. Obviously, can't test for the octane calculations as that takes a special lab and $$$. Edited
James M 0
Tuesday, February 17, 2026
Awesome app to quickly figure out e85 blend ratios with gasoline as well as octane with fuel blends.
Vincent Tyler 1
Wednesday, April 15, 2026
Devs don't tell you they want $7.00 a month for basic gas calculations.
Octane Studio
Wednesday, May 20, 2026
Well, that's completely false, it is an annual subscription. Also, it's in no way "basic" it's a capability that doesn't exist accurately anywhere.