App store conversion rate is the percentage of users who install after seeing your listing — and the first-screenshot, subtitle, and the above-the-fold copy account for almost all of it. Everything below the fold is a margin call; everything above it is where the line moves.
The first screenshot is the visual that earns the scroll-stop. Every user who reaches the listing is one frame away from installing or scrolling past; the screenshot they land on is the one they read first, and what they read in it is the single thing they would tell a friend who asked. One screenshot block per image, a one-line caption that uses the same verb the title uses, and one feature the user touches in their first session. Three screenshots that each describe a different feature lose the comparison against three screenshots that each describe the same user — and the comparison is what the install-rate number is actually reading.
The subtitle is the line the listing shows above the fold on mobile devices, beside the first screenshot, in plain prose the user can read at thumbnail size. The subtitle earns its slot when it carries the closest long-tail query the listing wants to rank for, not a tagline. The user is reading for what the app does in five seconds, not for what it stands for; the closest long-tail answer is what they install. The full keyword research pass sits at the sixty-minute keyword research pass — the same long-tail the research pass returned is the one the subtitle carries, in twenty-eight characters of plain prose.
The first line of the description opens with the same verb the title field uses. The store indexes the description, and the user reads it for trust — in that order. The line that opens with the same verb earns both reads: the ranking signal the description carries and the trust signal the user reads in the first sentence. The line that opens with a tagline earns neither — it splits the index from the trust signal and the first-screenshot comparison degrades accordingly. The full first-line discipline sits at the ASO checklist — items four through seven cover the visual half of the same rule, in the order the listing actually reads.
What most changes in week one. Pick one of three variables per edit: the first screenshot visual, the subtitle line, or the first line of the description. Two variables per edit is a coin flip; three is a fortune telling session. The shape of the edit is the same shape the A/B testing playbook covers at the CPP A/B testing playbook — one variable per test, fourteen days, cost-per-install read. Pick the highest-leverage variable first: the subtitle is the cheapest edit to ship and the cheapest to read, because the store re-indexes the subtitle within hours of the edit landing.
What to read after the edit. The cadence is Monday morning again: install-rate compared to last week, the source split underneath it, and the share of new installs that landed on the variant visual. Cost-per-install on paid traffic, install-rate on organic — the same pair the A/B testing playbook normalises to absorb traffic asymmetry. The whole conversion-rate discipline lands on a single Monday slot alongside the rating regression line and the keyword rank movement line — Bowroom’s Solo tier covers all three on one subscription. The pricing entry that fits a week-one founder lives at /pricing.