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No Magic Bullet.
Just Relentless Testing to Reach Orbit in Japan & Korea.

Scaling an app takes continuous iteration. Powered by our proprietary tech stack—ASO Index for organic store optimization and Rocket Ads for high-precision paid acquisition—we partner with you to turn raw data into predictable growth, aligning every test with your North Star Metric.

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FEATURES

Everything ASO needs, in one dashboard

Keyword Optimization

MKO
2M+keywords analyzed every day

Find the keywords that raise your ranking, and see how often they are searched.

Ranked KeywordsKeyword AnalysisCompetitor KeywordsAI Suggestions

Powered by GPT

Creative Optimization

CRO
A/Btests that actually compare

Lay out your creatives next to competitors’ and start more effective A/B tests.

New InspirationsStore PreviewCompare CreativesCRO Evaluation

App Store · Google Play

Review & Rating

RSO
4.5★target rating, simulated

Read ratings and reviews at a glance, and react quickly after every update.

Review MonitoringKeyword CloudRating Simulator

Positive · Negative keywords

Market Ranking

Insight
3Mapps tracked worldwide

Understand app store trends with ranking charts tied to keywords.

Category RankingMarket Ranking ChartApp Explorer

Updated daily

Japan & Korea

Localized
JP · KRmorpheme analysis built in

Break metadata down into meaningful Japanese and Korean keywords with our own morpheme logic.

JapaneseKoreanEnglish

Metadata Localization

ASO Status

Dashboard
1dashboard for everything

Keyword ranking, competitor analysis and review monitoring in one view.

ASO ScoreRank UpsRank DownsCompetitors

Keyword Tracking

Keyword Optimization

MKO
2M+keywords analyzed every day

Find the keywords that raise your ranking, and see how often they are searched.

Ranked KeywordsKeyword AnalysisCompetitor KeywordsAI Suggestions

Powered by GPT

Creative Optimization

CRO
A/Btests that actually compare

Lay out your creatives next to competitors’ and start more effective A/B tests.

New InspirationsStore PreviewCompare CreativesCRO Evaluation

App Store · Google Play

Review & Rating

RSO
4.5★target rating, simulated

Read ratings and reviews at a glance, and react quickly after every update.

Review MonitoringKeyword CloudRating Simulator

Positive · Negative keywords

Market Ranking

Insight
3Mapps tracked worldwide

Understand app store trends with ranking charts tied to keywords.

Category RankingMarket Ranking ChartApp Explorer

Updated daily

Japan & Korea

Localized
JP · KRmorpheme analysis built in

Break metadata down into meaningful Japanese and Korean keywords with our own morpheme logic.

JapaneseKoreanEnglish

Metadata Localization

ASO Status

Dashboard
1dashboard for everything

Keyword ranking, competitor analysis and review monitoring in one view.

ASO ScoreRank UpsRank DownsCompetitors

Keyword Tracking

STEP BY STEP ASO

Master ASO in 4 steps.

Your appASO indexApp Store · Google Play

  1. 01

    Sign up

    Create a free account. No payment details.

    • Free account
  2. 02

    Add your app

    Pick your app and the markets you care about.

    • App list
    • Market country
    • Competitors
  3. 03

    Analyze

    See where you rank and why, across keywords, creatives and reviews.

    • Keywords
    • Creatives
    • Reviews
  4. 04

    Grow

    Apply the changes and track the ranking every day.

    • Keyword Tracking
    • Rank Ups
WHY ASO INDEX

Big data and generative AI, built for Asian app stores.

The next-generation ASO engine, based on app store metadata, user search patterns and large language models. ASO index is made by aix Inc., with offices in Tokyo and Seoul.

Tokyo office

3F Hatsudai Center Building, 1-51-1 Hatsudai, Shibuya-ku, Tokyo

Seoul office

204, 2F Seongdeok Building, 128 Teheran-ro, Gangnam-gu, Seoul

Korea and Japan seen from orbit at night

Now, 100% free.

A fully free ASO tool specialized in Japanese, Korean and English. Start using it now.

Start for FreeStep by Step Guide