The ASO Project is exactly what it sounds like: a US agency, around since 2014, that does ASO and Apple Search Ads and not much else. I respect that focus. It is rarer than it should be. What I want to talk you out of is the way they sell it, because the monthly package model is the most comfortable way to overpay for App Store Optimization ever invented.
Here is the structure. You pick a tier. The tier includes keyword research, metadata updates, creative recommendations, and a monthly report. The fee recurs. On the surface this is fair: a known price for a known service. Look closer and ask what the service actually consists of in month five. The keyword research was done in month one. The metadata was rewritten in month two. The screenshot test shipped in month three. From then on, the package delivers monitoring, minor tweaks and the report, at the same price as the month the real work happened.
This is not a trick. It is how agencies make ASO fit a subscription. The stores do not respond in monthly increments. They respond to decisive changes, then go quiet for weeks while the ranking settles. A package bills the quiet at the same rate as the change. The agency needs this, because a business built on recurring revenue cannot afford engagements that end when the work does. You do not need it. You need the work, and then you need to leave it alone.
The Apple Search Ads half of the offer makes this worse, not better. Managing paid search is a legitimately ongoing job, and bundling it with ASO gives the package a reason to keep going. It also means the monthly report has something moving in it every month, which is the paid side, and the organic side rides along. Ask a package client which organic change shipped last month. Then ask which paid campaign was adjusted. The second answer will be longer.
Compare that with hiring one consultant on a fixed scope. The teardown, the rewrite, the test, the handover, with dates against each. When the work is done, the invoice stops. You own the keyword map and the test log. Your team learns to make the next change themselves, and to recognise when no change is the right call. The total is a fraction of a year of packages, because you are only paying for the months in which something happens.
To be fair to The ASO Project: for a company that wants a predictable monthly line item, a US-based team, and Apple Search Ads managed alongside organic, the package model is honest and the focus on ASO is genuine. For an app that needs its listing fixed and then left to work, a package is a subscription to waiting. Send me their proposal and I will show you which months contain the work and which months contain the report.