Real devices yes! I tried to use emulators a couple of times, but the first few attempts failed due to Instagram detecting it (missing cameras, etc.), and later attempts failed when I realized it's not going to save me a lot if I went the emulator route, because they need quite a lot of resources too, and you can't just run 10 emulators on a regular computer unless you optimise them extremely well and know what you're doing (custom Android build as a minimum). So it actually turned out to be easier with real devices. Plus, there's been some IP/VPN/Proxy emergencies, where it was super handy to pop in a 3G/4G sim card into the phone, and have it work 100% like a real person's phone. The cost is considerably higher (~ 15-50 GB per phone a month), but I am still looking into doing that, as it would allow the "phone agents" to become completely independent from location.

Buffer: I haven't done much in terms of "battling" with competition, simply because my users will tell me what they want, and that's an easier crowd to serve than trying to follow a competitor who may be running down the wrong path without knowing yet. If a bunch of users ask me for the same feature multiple times, then I look into what it takes to make it happen, or I'll explain why I can't offer that, and that's what's been driving it from day one.

Thanks for your note about the typo, I am actually always a bit ashamed of my landing pages, because they feel the least fun to make (to me at least), when they drive most of the conversion of course.

Is it something like buffer? If yes, what your prices?