OPK strips - app recommendations please

[lizziecat1]

I see people posting screenshot of clever apps that look like they read your opk strips for you and spot the peak for you. Is this a real thing? And if so, are there any good free ones?
I've just started using fertility friend which is lovely and clear for bbt monitoring, but I don't think it can do this.

I use the Premom app, it charts your BBT, OPK tests and pretty much anything else you would need I think

I also use the Premom app for the opks. I used fertility friend for tracking bbt and adding extra data such as dtd.

I was temping as well as opk so I used Femometer app for both, I really liked it, I just chose it because I bought the Femometer thermometer