Most indie developers treat iOS and Android ASO as the same problem with different UIs. They're not. The two stores have different search algorithms, different metadata structures, different ranking signals, and different user behaviors. Optimizing them identically means underperforming on at least one.
This is a direct comparison of what actually matters on each platform in 2026 - written for developers who don't have time to wade through guides that still describe the 2019 version of the stores.
How the search algorithms differ
Apple App Store indexes: app name, subtitle, keywords field, and in-app purchase names. It does not index the description for search ranking. The algorithm weights text relevance heavily, then applies behavioral signals - download velocity, conversion rate (page visits → installs), and user retention. A high-converting store page with good retention outranks technically superior metadata with poor behavioral signals.
Google Playindexes almost everything: title, short description, long description, and developer name. It weights keyword frequency in the long description, keyword mentions in user reviews, and download velocity. Google also uses its broader knowledge graph - you can rank for semantic variants of keywords that don't appear verbatim in your metadata, if enough related concepts do.
The practical difference: iOS requires surgical precision in a small number of characters. Android rewards thorough, well-written descriptions that cover the conceptual space of what your app does.
Metadata structure: side by side
| Field | iOS | Android |
|---|---|---|
| Title | 30 chars - indexed, highest weight | 30 chars - indexed, highest weight |
| Subtitle / Short desc | 30 chars - indexed | 80 chars - indexed |
| Keywords field | 100 chars - indexed (iOS only) | No equivalent |
| Description | Not indexed for search | 4,000 chars - indexed |
| In-app purchase names | Indexed | Not applicable |
The iOS keywords field has no Android equivalent. This is the single biggest structural difference. On Android, keyword coverage comes from the description - which means writing quality and keyword density both matter in a way they simply don't on iOS.
Rating and review signals
Both stores use ratings as ranking signals, but the behavior differs at the edges.
On iOS, star rating is prominently displayed in search results and directly affects conversion. Apple limits how often you can request a rating (via SKStoreReviewRequest), so your prompt timing matters. A 4.5+ average is roughly the threshold where ratings stop actively hurting you.
On Android, keyword mentions in reviews additionally influence rankings. Apps where users organically write "best habit tracker" in their reviews rank better for "habit tracker." You can't directly control review content, but responding to reviews and shipping fixes for common complaints drives better reviews - which contain better keyword signals. It compounds positively.
AI-generated content and store policy in 2026
Both Apple and Google now actively review metadata for AI-generated boilerplate. Apple's review team flags descriptions that read as clearly machine-generated. Google Play has introduced quality signals that penalize generic, non-differentiated long descriptions.
The correct workflow: use AI as a first draft, then edit substantially to match your actual product's voice and specific features. Generic AI output reads the same as every other app in your category - which is exactly the problem you're trying to solve with ASO.
Which store to optimize first
For most indie developers in 2026, iOS first, then Android. The reasons:
- iOS users monetize better.Average revenue per user is higher on iOS across almost every category. If you're optimizing for revenue, iOS installs are worth more per unit.
- The keywords field gives you a controlled experiment.Changing 100 characters has a measurable, attributable impact within 4–6 weeks. Android's algorithm is more complex to isolate.
- Android's algorithm is more forgiving. Google Play will often rank you for terms you didn't explicitly target, as long as your description covers the conceptual space. iOS requires more intentional optimization.
The exception: if your target market skews Android-heavy - Southeast Asia, parts of Europe, education apps - prioritize accordingly. Check your actual user geography before making this call.
The consistent thread
Both stores, in 2026, reward the same underlying thing: apps that users actually want. Metadata optimization is how you find the right users. Once they arrive, retention, ratings, and review quality take over. The developers winning organic traffic aren't running tricks - they're tracking data weekly, iterating based on what they see, and shipping apps that people keep.
The stores are increasingly good at surfacing apps that users love. ASO in 2026 is about being legible to both the algorithm and the human reading your store page.