The ASO API built
for developers
Keyword difficulty, real Apple search popularity, true rankings, reviews, ASO scores, and revenue estimates — for the App Store and Google Play, over plain REST.
No API key needed to try it · Prepaid credits from $10 · No subscription
One curl. No key. Real data.
Six endpoints work with no Authorization header at all — paste this into your terminal right now:
curl "https://trysonar.app/api/v1/keywords/metrics?keyword=habit%20tracker&store=ios&country=us"{
"data": {
"keyword": "habit tracker",
"store": "ios",
"country": "us",
"difficulty": 62,
"popularity": 58,
"popularity_source": "apple",
"est_downloads_at_1": 3400,
"results_count": 178
}
}The anonymous tier is rate-limited per IP per day. Sign up for 50 free credits, an API key, and higher limits.
A complete App Store Optimization API
An app store keyword API, keyword difficulty API, rank tracking API, and review API in one surface — ten stateless endpoints for research, plus org-scoped endpoints for daily tracking and workspace automation.
Plus, with a tracked workspace (Indie plan):
- /api/v1/apps/:id/rankings — Daily rank history
- /api/v1/apps/:id/keywords — Keywords an app ranks for
- /api/v1/competitors/:id/keywords — Competitor keyword analysis
- /api/v1/apps/:id/competitor-landscape — Competitive landscape + AI insight
- /api/v1/apps/:id/changes — Release & metadata change history
- /api/v1/products + write endpoints — Track apps, keywords, competitors programmatically
Full details in the API reference or the OpenAPI 3.1 spec.
Apple-reported, not guessed
Most ASO APIs sell you estimates. Sonar's iOS search popularity is Apple's own Search Popularity score (5–100), and every response tells you the source.
iOS popularity
Real Apple Search Popularity values, with popularity_source on every response.
iOS rankings
Validated against true App Store rankings — order matches within ±2 through the top 20.
Android popularity
Calibrated against Apple's values for the same keywords — MAE 12.5, methodology published.
The cheapest ASO API on the market
Enterprise ASO APIs start at $100–500+/month with annual contracts. Sonar starts at $10, prepaid. No subscription, credits never expire.
Free tier
No key required on six endpoints. 50 free credits on signup.
API credits
From $10 per 1,000 credits. Most calls cost 1 credit; full keyword research costs 10.
Indie plan
$19/mo — 1,000 requests/day plus the dashboard, daily rank tracking, and unlimited history.
ASO API questions
An ASO API gives you programmatic access to App Store Optimization data — keyword search volume, keyword difficulty, app rankings, reviews, and listing metadata — over plain HTTP instead of a dashboard. You can pipe the data into scripts, CI pipelines, internal dashboards, or AI agents.
Yes. Six stateless endpoints — app search, app lookup, ASO score, keyword extraction, keyword suggestions, and keyword metrics — work with no Authorization header at all, rate-limited per IP per day. Sign up to get 50 free credits and higher limits.
iOS search popularity is Apple's own Search Popularity score (5–100) from the Apple Search Ads console — Apple-reported, not estimated. Android popularity is a calibrated estimator validated against Apple's values for the same keywords (MAE 12.5). Every response tells you which source it used.
Pay-as-you-go credit packs start at $10 for 1,000 credits (most calls cost 1 credit; full keyword research costs 10). No subscription required and credits never expire. The Indie plan ($19/mo) includes 1,000 requests/day plus the dashboard, rank tracking, and unlimited history.
Enterprise ASO APIs typically start at $100–500+/month with annual contracts. Sonar starts at $10 in prepaid credits with no subscription, making it the cheapest ASO API for indie developers, scripts, and AI agents.
Yes — every endpoint takes a store parameter (ios or android) and a country code. Keyword difficulty, popularity, rankings, reviews, and revenue estimates work across both stores.
Prefer an AI agent to do the work? Use the ASO MCP server or the ASO CLI — same data, same credits.
Start with 50 free credits
Sign up, grab an API key, and make your first call in under a minute. Top up from $10 when you need more.
50 free credits · No subscription · Credits never expire