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ASO and Growth · Japan & Korea
Driving Your
North Star Metrics
Across Japan & Korea.
Scaling an app takes continuous iteration. With ASO Index and Rocket A, we turn your data into predictable growth.
- 120+app & game clients
- 75+media & creator partners
- 24+client countries
- 2markets, one team
- app growth
awards 2023☆Finalist☆ASO company - app growth
awards 2024☆Finalist☆Social & Influencer Campaign - app growth
awards 2024☆Finalist☆App Marketer of the Year
ASO Index
ASO that reads Japanese & Korean.
Most ASO tools split keywords by spaces. Japanese and Korean have none, so we read them by morpheme.
- Morpheme-level analysis
- Kanji · hiragana · katakana
- 100% free
무료퍼즐게임추천“free puzzle game recommendations”
Space-based tools무료퍼즐게임추천One unknown word
ASO Index무료free퍼즐puzzle게임game추천picks
パズルゲーム無料“puzzle game free”
Space-based toolsパズルゲーム無料One unknown word
ASO Indexパズルpuzzleゲームgame無料free
猫ねこネコ1 keyword“cat”
The challenge
Japan and Korea demand local know-how.
Each market has its own stores, media and habits. That is hard to master from abroad.
- We don’t know what Japanese users want.Insight
- Few local agencies work in English.Communication
- We need ASO, ads and creators in one place.Execution
Problem
Two markets, two agencies, many vendors.
Most publishers stitch together separate partners for each market and channel.
Our answer
One local growth team for both markets.
Analysis, execution and validation in one loop. Faster growth, fewer wasted tests.
- One contact for Japan and Korea
- App-focused and data-driven
- ASO, UA and creators in one plan
How we work
No magic bullet.
Just relentless testing.
Rockets became reliable through iteration. We run that loop with you until growth is predictable.
- 01
Diagnose
Find what really blocks your growth.
- 02
Hypothesize
Turn each plan into a testable bet.
- 03
Test
Test stores, keywords, creatives and channels fast.
- 04
Scale
Fund what works, cut what doesn’t, repeat.
Every test serves your North Star Metric — LTV, ROAS, retention or revenue.
Growth solutions
From market entry to global expansion.
We stay with you after launch day.
Growth
Acquire core users and optimize every week.
- ASO
- User acquisition
- Creative production
- A/B testing
Expansion
Take proven playbooks to new markets.
- New markets
- Branding
- PR & events
- Retention
Acquisition matrix
One acquisition channel is never enough.
We mix channels around your goals and KPIs.
App Store OptimizationASO Index
ASOStore visibility & conversion
More organic installs, powered by ASO Index.
+33%Organic
+65%Visibility
+72%Impressions
User AcquisitionRocket A
UAPerformance marketing
Local Japanese media and creatives via Rocket A.
−18%CPI
+128%ROAS
Social Media
BrandingContent-led growth
Local creators who build trust and installs.
+500Creators
+128%Engagement rate
Integrated Acquisition
HybridEnd-to-end growth strategy
ASO, UA and branding as one plan.
+42%LTV
+31%D30 retention
※ Top 10 services operated by aix, 2024–25 average.
Performance highlights
Growth we’ve delivered in Japan.
D30 ROAS63.8%
Hardcore Games
High-intent UA lifted efficiency and LTV.
- Genres
- MMORPG, Strategy, Simulation
- Key KPIs
- LTV, ROAS
- Levers
- Hybrid, UA, Influencers, Creative
D30 ROAS52.4%
Midcore Games
UA plus ASO grew ROAS and organic.
- Genres
- RPG, Action, Adventure
- Key KPIs
- ROAS, Retention
- Levers
- ASO, UA, Influencers, Creative
D30 ROAS79.2%
Casual Games
Low CPI at scale, plus ad revenue.
- Genres
- Puzzle, Arcade, Hyper Casual
- Key KPIs
- CPI, ROAS
- Levers
- UA, ASO, Creative A/B testing
※ Some data anonymized for client privacy. D30 ROAS: top 10 services, 2024–25 average.
Who we grow with
Built for apps and games that win locally.
Best fit: publishers who ship their own apps and share data.
Mobile games
- HardcoreMMORPG, strategy, shooters
- MidcoreRPG, simulation, sports
- CasualPuzzle, arcade, hyper-casual
Mobile apps
- ContentOTT, webtoon, music, community
- Commerce & FinanceShopping, rewards, banking, investing
- Lifestyle & UtilityProductivity, health, education
Insight
Notes from the Japanese and Korean markets.
TOP 20 Health & Fitness Apps in iOS App Store Japan
In today’s increasingly health-conscious world, the healthcare/fitness app market is diverse, with many apps appealing to users interested in health management and fitness.
Exploring Google’s Experimental Generative AI for Custom Store Listings (with Test Results!)
In a groundbreaking move, Google Play developers now have access to an experimental AI tool that promises to revolutionize the way store listings are created. This cutting-edge feature, aptly named…
ASO Audit: Airbnb Japan
The Airbnb app has achieved the 24th position among Travel category apps in the Japanese App Store. While this accomplishment is noteworthy, a closer examination of its App Store Optimization (ASO)…
Who do you work with?
App and game publishers entering Japan or Korea — ideally teams that ship their own apps and can share data.
Can we work with you in English?
Yes. Our team works in English, Japanese and Korean, from offices in Tokyo and Seoul.
How are you different from a local agency?
One team covers both markets and every channel — ASO, UA, creators and PR — with our own tools, ASO Index and Rocket A.
What does it cost?
Every engagement is scoped to your goals and budget. Tell us about your app and we’ll suggest a plan.
Is ASO Index really free?
Yes. ASO Index is 100% free — no plans and no payment details.
Ready for launch
Find your North Star in Japan & Korea.
Tell us about your app. We’ll show you where growth can come from.