Free ASO Keyword Tools: Best Options Compared

Keyword research is the foundation of App Store Optimization — but professional ASO tools can cost $50 to $500+ per month. For indie developers, bootstrapped startups, and anyone testing the waters with ASO for the first time, that investment is hard to justify before proving the value.

The good news: there are legitimate free tools and methods that provide useful keyword data for app store optimization. The bad news: free tools have significant limitations compared to paid alternatives. Understanding what each tool offers — and where it falls short — helps you make the most of free resources and know when it's time to upgrade.

This guide compares every free ASO keyword research option available in 2026, from native platform tools to third-party freemium products, along with creative workarounds that cost nothing.

Native Platform Tools (Completely Free)

Apple Search Ads (Keyword Popularity Scores)

What you get for free:
Apple Search Ads provides keyword "popularity" scores (scale of 5-100) for any keyword you search in the campaign creation interface. You don't need to run any ads or spend money — just create an account and use the keyword suggestion tool.

How to access:

1. Create an Apple Search Ads account (free at searchads.apple.com)
2. Start creating a new campaign (you won't actually launch it)
3. In the keyword selection step, search for any keyword
4. View the popularity score and suggested bid

What the popularity score means:

• 5-15: Very low volume (fewer than ~50 daily searches)
• 16-30: Low volume (~50-200 daily searches)
• 31-45: Medium volume (~200-1,000 daily searches)
• 46-60: High volume (~1,000-5,000 daily searches)
• 61-100: Very high volume (5,000+ daily searches)

These are rough estimates — Apple provides a relative score, not absolute numbers.

Strengths:

• Comes directly from Apple — most authoritative iOS search data available
• No cost, no trial period, unlimited lookups
• Also shows suggested bid amounts (indicator of commercial value)
• Keyword suggestions based on your app or category

Limitations:

• Popularity scores are relative, not absolute volume counts
• No historical data or trend information
• No keyword difficulty scores
• No competitor keyword data
• iOS only — no Google Play data
• Interface designed for ad campaigns, not ASO research

Best for: Validating iOS keyword ideas and comparing relative popularity between keyword candidates.

Google Play Console (Search Performance)

What you get for free:
If you have a published app on Google Play, the Play Console provides limited search performance data including which queries lead to your store listing page.

How to access:
Google Play Console → Statistics → Store listing acquisition → Filter by search

What you can see:

• Search terms that led visitors to your listing
• Number of visitors per search term
• Install conversion rate per search term

Strengths:

• Real data from your actual app's performance
• Shows which keywords currently drive traffic to your listing
• Conversion rate per keyword reveals which terms attract qualified users

Limitations:

• Only shows keywords where your app already appears (not discovery of new keywords)
• Limited to your own app — no competitor data
• Minimum traffic threshold before data appears
• No search volume estimates for keywords you don't rank for

Best for: Understanding which keywords currently drive traffic to your existing Google Play listing.

Google Keyword Planner (Web Search Proxy)

What you get for free:
Google Keyword Planner provides web search volume data, keyword suggestions, and competition levels. While this is web data — not app store data — there's meaningful correlation between web and app store search behavior.

How to access:

1. Create a Google Ads account (free)
2. Navigate to Tools → Keyword Planner
3. Use "Discover new keywords" or "Get search volumes"

Strengths:

• Massive keyword database with volume estimates
• Keyword suggestions expand your initial seed list significantly
• Trend data shows seasonal patterns
• Competition and CPC data indicate commercial intent

Limitations:

• Web search volume ≠ app store search volume (correlation exists but isn't precise)
• Some app-specific terms may not appear in web data
• Volume ranges are broad without active ad spend (e.g., "1K-10K" instead of exact numbers)
• No app store ranking or difficulty data

Best for: Expanding your keyword list and identifying seasonal trends. Use as a directional input, not as exact app store volume data.

Google Trends

What you get for free:
Relative search interest over time for any keyword, with geographic and related query breakdowns.

How to access: trends.google.com (no account needed)

Strengths:

• Compare interest between multiple keywords over time
• Identify seasonal patterns and emerging trends
• Geographic breakdown by country and region
• Related queries reveal keyword expansion opportunities
• Completely free, unlimited usage

Limitations:

• Relative data (0-100 index), not absolute volume
• Web search data, not app store specific
• Doesn't show actual install or ranking potential
• Can't filter specifically for mobile or app-related intent

Best for: Comparing relative popularity between keyword candidates, identifying seasonal optimization timing, and spotting emerging trends before they peak.

Freemium ASO Tools

AppTweak Free Plan

What you get:
AppTweak offers a limited free tier that provides basic keyword data for a small number of keywords.

Free features:

• Limited keyword searches per month
• Basic keyword volume and difficulty scores
• App store listing preview
• Limited competitor analysis

Limitations:

• Very restricted number of free queries
• Historical data locked behind paid plans
• Limited market (country) options
• No keyword tracking or ranking monitoring

Best for: Spot-checking specific keywords when you need more data than Apple's popularity score provides.

Sensor Tower Free Features

What you get:
Sensor Tower provides some free data through their website, including top chart data and limited app intelligence.

Free features:

• Top charts by category and country
• Basic app intelligence (estimated downloads, revenue)
• Limited keyword suggestions

Limitations:

• Most useful features require paid subscription
• Free data is very high-level
• No detailed keyword volume or difficulty data
• Limited to a few lookups before hitting walls

Best for: General market intelligence and category research rather than detailed keyword analysis.

Appfollow Free Plan

What you get:
Appfollow offers a free tier focused on review management with some ASO features.

Free features:

• Review monitoring and response
• Basic keyword tracking (limited keywords)
• Store listing analysis
• Competitor monitoring (limited)

Limitations:

• Very limited keyword count in free tier
• No keyword volume or difficulty data
• Primarily a review management tool

Best for: Combining review management with basic keyword tracking in a single free tool.

Creative Free Methods (No Tools Required)

App Store Autocomplete Mining

The most underrated free keyword research technique:

Process:

1. Open the App Store or Google Play on your phone
2. Type a seed keyword letter by letter
3. Record every autocomplete suggestion
4. Systematically append each letter of the alphabet to your seed

Example: Type "meditation" then "meditation a", "meditation b", "meditation c"...
This reveals real user search behavior — Apple and Google only suggest terms that actual users search for.

Strengths:

• Free, always current, reflects real search behavior
• Works on both iOS and Google Play
• Reveals long-tail keywords that tools sometimes miss
• No account or registration needed

Limitations:

• No volume data (you know the keyword is searched but not how often)
• Manual and time-consuming
• Results may be personalized based on your device/account
• No difficulty or competition data

Pro tip: Use a new device or guest account to avoid personalization bias in autocomplete results.

Competitor Metadata Analysis

Reverse-engineer competitor keyword strategies for free:

Process:

1. Identify your top 10 competitors in the app store
2. For each competitor, record their title, subtitle (iOS), short description (Google Play), and full description
3. Note recurring keywords across competitors — these likely have volume
4. Identify keywords used by top-ranked competitors but not by lower-ranked ones

On Google Play, also:

• Read the full description for keyword density patterns
• Note which terms appear in the first paragraph (intentionally prioritized)
• Check IAP names for additional keyword targeting

Strengths:

• Completely free — all data is publicly visible
• Reveals validated keywords (competitors wouldn't target them without reason)
• Shows metadata structure patterns that work in your category

Limitations:

• Can't see iOS keyword field (hidden metadata)
• No volume, difficulty, or ranking position data
• Competitors may have poorly optimized metadata too
• Time-intensive manual process

Review Mining

Extract keyword ideas from user reviews:

Process:

1. Read the most recent 100-200 reviews for your app and top competitors
2. Note the language users use to describe features, problems, and use cases
3. Identify repeated phrases that represent real user search language

Example findings from a budget app's reviews:

• "expense tracker for couples" → long-tail keyword opportunity
• "automatically categorize spending" → feature-specific keyword
• "sync with my bank" → use-case keyword

Strengths:

• Reveals the actual language your users use (may differ from your assumptions)
• Uncovers feature-specific long-tail keywords
• Identifies unmet needs that could inform both keywords and features
• Free and available for any app

Limitations:

• No search volume data
• Time-intensive analysis
• Reviews may contain idiosyncratic language not reflective of search behavior
• Requires manual categorization and analysis

App Store Category Chart Analysis

Analyze the keywords used by top-ranked apps in your category:

Process:

1. View the top 50 apps in your category on both stores
2. Record keywords appearing in their titles and subtitles
3. Map common keywords — if 30 of the top 50 include "tracker," it's a must-have keyword
4. Identify underused keywords — terms relevant to your category that few top apps include

Strengths:

• Shows what the most successful apps prioritize
• Free and requires no tools
• Reveals category-standard terminology

Building a Free Keyword Research Workflow

Step-by-Step Process

Phase 1: Seed Generation (1-2 hours)

1. Brainstorm 20-30 seed keywords describing your app
2. Run each seed through App Store autocomplete (both stores)
3. Record all suggestions → expanded keyword list of 100-200 terms

Phase 2: Competitive Intelligence (2-3 hours)

1. Identify top 10 competitors
2. Record their titles, subtitles, descriptions
3. Mine their reviews for language patterns
4. Add unique competitor keywords to your list

Phase 3: Validation and Prioritization (1-2 hours)

1. Check each keyword in Apple Search Ads for popularity score
2. Cross-reference top candidates with Google Keyword Planner for web volume and trends
3. Use Google Trends to identify seasonal patterns
4. Score each keyword: popularity × relevance (1-10 scale)

Phase 4: Implementation

1. Assign top keywords to title and subtitle (highest weight)
2. Fill keyword field (iOS) with remaining high-priority unique words
3. Write Google Play description incorporating keywords naturally
4. Track rankings using free methods (manual search checks weekly)

Free Tracking Method

Without a paid tracking tool, manually check your rankings weekly:

1. Search for each of your top 20 keywords in the app store
2. Note your position (or if you're not in the top 50)
3. Record in a simple spreadsheet with date
4. Review trends monthly

This is tedious but provides the core data you need to evaluate your ASO effectiveness.

When to Upgrade to Paid Tools

Free tools work well for:

• Initial keyword research and listing optimization
• Apps with fewer than 10,000 monthly installs
• Developers just learning ASO fundamentals
• Validating whether ASO investment is worthwhile

Consider upgrading when:

• You need daily automated keyword ranking tracking
• You want keyword difficulty and volume estimates for prioritization
• You're optimizing across multiple markets (localization)
• You need competitor keyword tracking at scale
• Your app generates enough revenue to justify the tool cost ($50-200/month)
• Manual tracking becomes unsustainable as your keyword portfolio grows

The ROI calculation is simple: If a $100/month ASO tool helps you improve rankings enough to generate 500 additional organic installs per month, and those installs would cost $2 each through paid acquisition, the tool saves you $900/month in equivalent paid spend.

Common Mistakes When Using Free Tools

Relying solely on Google Keyword Planner volume. Web search volume doesn't equal app store search volume. A keyword with 10,000 monthly Google searches might have 500 app store searches. Use Google data as directional input, not exact guidance.

Ignoring Apple Search Ads popularity scores. This is the most authoritative free iOS keyword data available. Many developers skip it because it requires creating an account — the 10-minute setup is worth it.

Not doing autocomplete research. It's manual and tedious, but autocomplete mining reveals keywords that even expensive tools sometimes miss. Spend 2-3 hours on this quarterly.

Treating free research as one-time. Keyword relevance and volume shift over time. Even with free tools, repeat your keyword research quarterly to stay current.

Not tracking results. Optimizing keywords without tracking ranking changes means you can't learn what works. Even manual weekly rank checks provide essential feedback for improvement.

Conclusion

Free ASO keyword tools have real limitations — no automated tracking, limited volume data, and no difficulty scores. But they provide enough signal to build and execute a solid keyword strategy, especially for apps in the early growth stages.

The combination of Apple Search Ads popularity scores, Google Keyword Planner directional data, app store autocomplete mining, and competitor metadata analysis gives you a comprehensive keyword research toolkit at zero cost. Layer in Google Trends for seasonal intelligence and manual rank tracking for performance measurement, and you have everything you need to start improving your organic app store visibility.

Start free, prove the value of ASO through improved rankings and organic installs, then reinvest in paid tools when the ROI justifies the upgrade. The developers who never start because they can't afford premium tools miss the entire opportunity — the free tools are more than enough to begin.