AppFollow is well suited if you only operate in a few app store countries and don't have a high volume of keywords that you are looking to rank for. This is, of course, the free plan. Besides that AppFollow is well suited for communication with other apps - they have an open API and other connections to a ton of third-party analytical tools.
It's best used for small to mid-sized businesses that need to track a modest number of keyword phrases - perhaps 100 to 500 - across multiple search engines, in a limited number of geographies, against three or fewer competitors. It's less useful for large enterprises or small businesses that need multiple SEO functions handled by a single tool.
This is an area where AuthorityLabs really shines. It's one of the few Martech or SEO tools vendors about whom I can honestly say I've never had a complaint about their customer support. The team there consistently responds to any questions I've had or issues I've encountered quickly, helpfully, and in a way that feels personal.
While App Annie is extremely robust and pulls in data from acquisition channels, app stores, and elsewhere, it can be quite overwhelming at times. If you are looking for more simple and just keyword positioning then definitely look at AppFollow. Apart from the two platforms themselves, I've had numerous contact experiences with both AppFollow and App Annie. The winner is definitely AppFollow with a less aggressive approach and a higher willingness to go above and beyond to make sure all questions are answered. With App Annie I was bombarded with a ton of sleazy, sales emails to purchase their product.
Very comparative as far as price [goes]. Some of the competitors have different features but you get trade-offs depending on who you are comfortable using.
We did not any process in terms of reporting on ROI in regards to SEO, but we only paid a very small monthly charge so it was a no-brainer to use it. It definitely helped our business.