I’m currently using an app called Zoya. They survey American stocks currently but plan to diversify and survey European stocks as well.
In regards to what is classified as shariah compliant/non compliant there are a number of things that get taken into account which you can search online. They look at what is the nature of the business and the transactions/debt it has etc.
Generally speaking though a company which trades on that which the Islam prohibits e.g. pork or alcohol will be haram. However some jurists would accept this if this was only a minimal part of the profit of the company. How much really depends on their calculations and understanding.
I’m not here stating Greggs is a shariah compliant investment. We all have to do our own research our find someone we trust to tell us it is.
I wonder if FreeTrade could adopt the DOW Islamic index and/or have companies on their index. I would be very interested in investing more if that could be done. I know plenty more who would also feel the same