ASO Fundamentals

ASO Foundations: A 2026 Reference Summary

Everything that matters for App Store and Google Play Optimization in 2026, distilled into a single reference page. The principles, levers, and starting points indie developers need.

ASOhack TeamMay 19, 20266 min read

This is the reference page. If you only read one post on ASO, read this one. Everything else on the blog drills deeper into specific topics.

The 10 ASO truths

1. Title is the highest-weighted ranking signal

iOS and Android both. Title + subtitle (iOS) / short description (Android) carry 50%+ of your keyword ranking weight.

2. iOS description is NOT indexed for search ranking

(Since 2017.) Use description for conversion (humans), not ranking. Google Play description IS indexed.

3. The keywords field (iOS only) is invisible but indexed

100 characters. Comma-separated. Pack with unique terms that aren't in title or subtitle.

4. Ratings affect ranking non-linearly

Below 4.0 = significant ranking demotion. 4.5+ = competitive. 4.7+ = strong. 4.8+ = excellent (5.0 looks suspicious).

5. Install velocity > install volume

A new app with sustained growth in week 4 outranks an old app with flat installs. Apple/Google reward trajectories.

6. Install retention is a hidden ranking signal

Apps that retain users rank higher than apps where users uninstall. This is why product quality compounds ASO.

7. Conversion rate affects ranking via algorithm learning

Higher impression→install rate signals you're a good match for the keyword. Apple/Google learn from user behavior.

8. Localization is per-market, not just translation

Each market has different keywords, screenshots, expectations. Re-do per market.

9. Reviews respond is a ranking + conversion signal

Both stores index your responses to reviews. Plus visitors see your responsiveness.

10. ASO is ongoing, not one-time

Algorithms shift, competitors update. Maintain monthly cadence (see iteration rhythm).

The 6 levers in priority order

For most indie apps, work on these in order:

Lever 1: Listing quality

Icon, screenshots, video, copy. The single most impactful ASO investment.

→ Read: App Icon Design, Screenshot Best Practices, App Preview Video Guide.

Lever 2: Keywords

Title + subtitle + keywords field. Right keywords for your niche.

→ Read: App Store Keyword Research, Keyword Difficulty Explained.

Lever 3: Conversion rate

Listing → install. Optimized via A/B testing.

→ Read: App Store Conversion Rate Optimization, Bounce Rate.

Lever 4: Retention quality

D7, D30 retention. Built via onboarding + product quality.

→ Read: Onboarding Optimization, Churn and Retention.

Lever 5: Reviews + ratings

Get more, respond well, maintain quality.

→ Read: Get More App Reviews, Review Response Templates.

Lever 6: Localization

Per-market keywords + screenshots.

→ Read: App Store Localization Guide, Keyword Localization by Market.

The 10 things to avoid

Keyword stuffing in description. Either ineffective (iOS) or penalized (Android).
Competitor brand names in metadata. Rejection magnet.
Generic stock screenshots. Tank conversion.
Hyperbolic claims ("#1", "best"). App Store rejection.
Aggressive paywall in onboarding. Tanks retention.
Skipping localization. Misses 50%+ of TAM.
No review responses. Free ASO lever ignored.
One screenshot redesign per year. Drift = ranking decay.
Translation instead of localization. Wastes the per-market keyword space.
Trusting paid ASO tools without learning the fundamentals. Tools are diagnostics, not solutions.

The starting workflow

If you're new to ASO:

Week 1

Run free ASO audit on your app.
Note the top 5 fixes.

Week 2-4

Fix the audit findings.
Set up analytics if not already.

Month 2-3

Establish monthly iteration cadence.
Start A/B testing screenshots.

Month 4-6

Localize for top 3 markets.
Build review velocity.
Iterate based on data.

Month 7-12

Compound improvements.
Quarterly strategic reviews.
Refine pricing + monetization based on data.

Year 2+

Annual deep refresh.
Strategic localization expansion.
Compound across years.

Common starting traps

Hiring an agency before understanding fundamentals. Talk to an agency speaks louder than the basics.
Buying paid tools before maxing free ones. Most need only free tools.
Paid acquisition before listing polish. Wastes 2-5× more budget.
Optimizing for ranking before retention. Brings users who churn.

When to invest more

If you've nailed the fundamentals and your unit economics work:

Localize to more markets.
Increase paid acquisition.
Hire ASO contractors for ongoing work.
Add Custom Product Pages to scale paid creative.

See hiring ASO contractors and budget planning.

The category guides

If you're in a specific category, also read:

The cross-cutting guides

For everyone:

The 90-day plan

Don't try to read everything at once. Pick:

Week 1: this post + audit checklist + run an audit.
Week 2-4: your category guide + 2 fundamentals posts.
Month 2: monetization + retention if subscription app.
Month 3: localization + paid acquisition basics.

Pace yourself. The blog has 100+ posts; you don't need all of them at once.

Try the tools

The whole point of ASOhack is to operationalize this stuff for free:

Free ASO audit — scored 0-100 + fix list.
Listing Analyzer — same dimensions, deeper detail.
Keyword Density Checker — analyze any listing.
Keyword Explorer — discover keyword ideas.
Competitor Tracker — track up to 5 competitors.
Screenshot Lab — AI feedback on visuals.
Review Analyzer — sentiment on reviews.
Ad Analytics Calculator — funnel + LTV/CAC math.
Ad Benchmark Analyzer — compare to category medians.
Compare — two apps side-by-side.