I don’t know about other sites, but as per my knowledge “Opstra” is good for back testing options.

Building strategies is free of cost in Opstra, but there is no free service for back testing. You will have to pay Rs. 1530/- per month to access Opstra Back Testing Services.

I’ll share the step by step procedure to make payment and access the back testing tools.

1. Visit the Opstra website here
2. Click on Get Started button on the home page
3. You will be redirected to the Registration Page
4. Complete the Registration Process
5. Click on Options tab in the menu section
6. You will find the options simulator from the drop down, click on it
7. Click on Make Payment button to finish the payment process
8. Wait for 5 to 10minutes to enable the services

You can back test the last 2 years data in various time frames.