The first step in identifying keywords is having a set of effective tools at your disposal. Currently, the following mainstream research tools are available for your consideration:

1. Google AdWords Keyword Planner

（https://ads.google.com/aw/keywordplanner/home）

Pros:

  • Official data is the most accurate
  • Basic features are free to use
  • Provides search volume and competition metrics

Cons:

  • Requires a Google Ads account
  • Data ranges are displayed as intervals rather than precise values
  • Advanced features require a history of ad spend

Cost: Free (requires ad spend to unlock full data)

2. Bing Keyword Research

Pros:

  • Official Microsoft data
  • Supports multi-language keywords
  • Provides exclusive Bing/Yahoo data

Cons:

  • Smaller market share than Google
  • Relatively simple feature set
  • Lower data update frequency

Cost: Free

3. Keyword Discovery

（https://www.keyworddiscovery.com）

Pros:

  • Historical data dating back to 2003
  • Supports long-tail keyword research
  • Offers multi-language support

Cons:

  • Outdated interface
  • Advanced features require a subscription
  • Poor mobile experience

Cost: Standard version is free; Pro version starts at $49.95/month

4. WordStream Keywords

（https://www.wordstream.com/keywords）

Pros:

  • Powerful keyword grouping features
  • Provides PPC advertising suggestions
  • Offers a wide range of free tools

Cons:

  • Limited functionality in the free version
  • Data updates are delayed
  • Limited export formats

Cost: Free version available; Premium plans start at $199/month.

5. SEMrush

（https://www.semrush.com）

Pros:

  • All-in-one SEO tool
  • Powerful competitor analysis features
  • Real-time data updates

Cons:

  • Steep learning curve
  • High price point
  • Some data requires verification

Cost: Starts at $199/month

6. Conductor （Former SearchMetrics）

（https://www.conductor.com/）

Pros:

  • Enterprise-grade solution—more than just a keyword research tool
  • Content optimization recommendations
  • Professional, visual reporting

Cons:

  • Targeted exclusively at enterprise clients
  • High cost for custom requirements
  • Average response times

Cost: Quote required (typically $1,000+/month)

7. Google Autocomplete

Pros:

  • Completely free
  • Reflects user search habits in real time
  • Supports multilingual suggestions

Cons:

  • No quantitative data
  • Influenced by personal search history
  • Limited functionality

Cost: Free

8. KeywordSpy

（https://www.keywordspy.com）

Pros:

  • Analysis of competitor Ad copy
  • Provides PPC advertising data
  • Supports multi-Platform monitoring

Cons:

  • Questionable data accuracy
  • Complex interface
  • Infrequent updates

Cost: Unknown

9. Visual Thesaurus

（https://www.visualthesaurus.com）

Pros:

  • Visualizes semantic relationships
  • Suitable for content creation
  • Supports word pronunciation

Cons:

  • Not a traditional SEO tool
  • No search volume data
  • Subscription-based pricing

Cost: $2.95/month or $19.95/year

10. VisuWords

（https://visuwords.com）

Pros:

  • Completely free
  • Interactive semantic network
  • Suitable for brainstorming

Cons:

  • Academic-oriented tool
  • No SEO-related metrics
  • Limited functionality

Cost: Free

11. Keyword.io

（https://www.keyword.io）

Pros:

  • No registration required; completely free to use.
  • Automatically retrieves and aggregates autocomplete suggestions from Google, YouTube, Amazon, Bing, Yandex, Wikipedia, eBay, Alibaba, Fiverr, Fotolia, and other platforms; results can be easily filtered and exported.
  • Ideal for discovering long-tail keywords.

Cons:

  • Lacks SEO-specific metrics.
  • Does not support quantitative analysis of keywords.

Cost: Free