Best keyword research tool, according to ChatGPT, Gemini, Claude and Perplexity
We asked four major AI models a single buyer-style question and recorded what they named. This page shows the verbatim brand short lists each model returned, plus where the models agreed and what they cited.
ChatGPT
Gemini
ClaudeBrowse all 10 keyword research tools in the directory
Every tool in this category, each with its own AI-visibility footprint.
The question we asked
“What's the best keyword research tool for SEO?”
At a glance
Distinct brands named
10
Across 4 of 4 models
Cited by all four models
3
True cross-model consensus
Named by only one model
5
50% of recommendations are model-specific
Total citations
42
Source URLs returned by all models combined
Brand by model coverage
Every brand named by at least one model, with the position each model gave it. First-place positions matter most: they carry disproportionate weight in how readers remember and quote AI recommendations.
| Brand | ChatGPT | Gemini | Claude | Perplexity | Models |
|---|---|---|---|---|---|
| Ahrefs | 1 | 2 | 2 | 1 | 4/4 |
| SEMrush | 2 | 1 | 1 | 2 | 4/4 |
| Google Keyword Planner | 4 | 3 | 5 | 6 | 4/4 |
| Ubersuggest | · | 4 | 4 | 5 | 3/4 |
| Mangools | · | · | 6 | 4 | 2/4 |
| Mangools (KWFinder) | 3 | · | · | · | 1/4 |
| Moz | · | · | 3 | · | 1/4 |
| Keysearch | · | · | · | 3 | 1/4 |
| Moz Pro | 5 | · | · | · | 1/4 |
| KWFinder | · | 5 | · | · | 1/4 |
What each AI model named
ChatGPT
- 1Ahrefs
- 2SEMrush
- 3Mangools (KWFinder)
- 4Google Keyword Planner
- 5Moz Pro
Ahrefs leads for depth, database size and competitor analysis; SEMrush is the best all‑round toolkit and workflows; Mangools/KWFinder is a strong, affordable, user‑friendly choice for long‑tail and local keywords; Google Keyword Planner is the free baseline directly from Google; Moz Pro is beginner‑friendly with clear metrics. Pick by budget, need for backlink/competitor data, and ease of use.
Gemini
- 1Semrush
- 2Ahrefs
- 3Google Keyword Planner
- 4Ubersuggest
- 5KWFinder
Semrush and Ahrefs are top-tier, comprehensive tools offering extensive features for professional SEO. Google Keyword Planner is excellent for foundational research and Google's data. Ubersuggest provides a great balance of features for intermediate users, while KWFinder is ideal for beginners and long-tail keyword discovery.
Claude
<cite index="4-7,4-8">Semrush dominates as the best keyword research tool for 2026 with over 25 billion keywords in its database</cite>. <cite index="8-3,8-4">Ahrefs tops rankings for unmatched database and keyword suggestions</cite>. <cite index="3-31,3-32">Moz stands out for accurate keyword difficulty assessment</cite>. <cite index="3-18,3-19,3-20">Ubersuggest makes research accessible with clean, straightforward metrics</cite>. <cite index="5-24,5-29">Google Keyword Planner is free with enhanced 2026 features</cite>. <cite index="4-21">Mangools suits budget-conscious SEOs with an intuitive interface</cite>.
Perplexity
- 1Ahrefs
- 2Semrush
- 3Keysearch
- 4Mangools
- 5Ubersuggest
- 6Google Keyword Planner
I recommend Ahrefs first for its unmatched competitor analysis and depth, followed by Semrush for all-in-one SEO power. Keysearch and Mangools are top budget-friendly options with strong data. Ubersuggest offers great AI insights, while Google Keyword Planner remains the best free starting point for new SEOs.
Where the models agreed
5 brands were named by more than one model. AI models diverge often; cross-model agreement is a stronger signal than a single mention.
| Brand | Models that named it | Best position |
|---|---|---|
| Ahrefs | ChatGPT (#1), Gemini (#2), Claude (#2), Perplexity (#1) | #1 |
| SEMrush | ChatGPT (#2), Gemini (#1), Claude (#1), Perplexity (#2) | #1 |
| Google Keyword Planner | ChatGPT (#4), Gemini (#3), Claude (#5), Perplexity (#6) | #3 |
| Ubersuggest | Gemini (#4), Claude (#4), Perplexity (#5) | #4 |
| Mangools | Claude (#6), Perplexity (#4) | #4 |
What this snapshot suggests
For the question "What's the best keyword research tool for SEO?", the 4 models reporting collectively named 11 distinct brands on July 9, 2026.
Each model led with a different recommendation in many cases. ChatGPT opened with Ahrefs. Gemini opened with Semrush. Claude opened with Semrush. Perplexity opened with Ahrefs. The brand a model names first carries disproportionate weight, because first-place recommendations are the most likely to be remembered by readers and quoted by downstream AI agents.
Treat this as a snapshot, not a definitive ranking. AI Overview content changes 70 percent of the time for the same query, and SparkToro found less than a 1-in-100 chance that two identical queries return the same brand list. The pattern across many runs is more informative than any single result. That is why Honeyb runs measurements daily, across a full prompt set rather than a single question, for the brands we monitor.
If your brand appears here, the recommendation work is paying off. If it does not, the gap is measurable and improvable. The pillars of getting recommended by AI are documented in our guide to generative engine optimization.
Source domains AI cited
Most-cited domains across the four models. Stacked segments show which engine drove each citation. Perplexity and Claude expose citations consistently; ChatGPT and Gemini do so inconsistently, so absence does not mean a model used no source.
Full citation list
- https://ahrefs.com/keywords-explorer
- https://www.semrush.com/features/keyword-research/
- https://mangools.com/kwfinder/
- https://business.google.com/en-all/ad-tools/keyword-planner/
- https://moz.com/explorer
- https://www.dailyvanguard.com/best-keyword-research-tools-2026/
- https://ahrefs.com/seo/keyword-research
- https://aistackpicks.com/reviews/best-seo-keyword-research-tools-2026/
- https://ahrefs.com/
- https://www.semrush.com/features/keyword-research-toolkit/
- https://mangools.com/kwfinder/features/
- https://www.seo.com/tools/keyword-research/
- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFGmChovJfMSH_60975dBb7SHiMVstCLSaDZwJT8PCzM6Jq2diUVt1YQ9OqeQ-C_9QGgqrQi66d8HJOeTvlsoR4z_ACR2-tB6TNjFrCQnwzm0BPtrxHb-F2eBiUdKCir_QjFn7g3DVXGxjf94awvA==
- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH_VLSisH5nUhEtMjQYkVYrgfbVwbGWC8BspUAShRgoCi7MEYVU3FGMDndBE0iOloL65fS_YR7fOwvKm3ZCr9pFSq3uLhdiR5bWCUMluJ1-vM74Vqnrtwf82IsRJ0KuoG0Ku1isQyfMjtxTPYi3Tc8mwBNxxhZHw5NnbjeyKfhudQ==
- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH0SL2DCIDDes2H658wezpjQyXxtF7G3dvuDse5PlvLfmx2clKFwudEODfwYPURp8l7R1LI58OmpdGuSzew2MYCe6wlG3Ax-3VYfW0BPrb9XYI6mNAmEmkwarTklp4atpH_dfUSI-oVTDH8Opwyo_artbYLYx-lb8fqETRTKHKb0vIqMTHLtIMTt4jfJWNQbfcYNh5PnSWtlHAY5vkW
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- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQEhHEQHx5xJAMLsi0PptIBSBsf6tbdMIeRT6BTtlGkAGeR8k8yLB8stNLWe1E9RjKnQL9JP80_K7IuYlxsCJJdFH195hEC0bQEwFI63IKlIY-yuSjFCPonsWz2lCD2eq2Sll-GaDMxYDpVYBq4kP66O4mUlXNjdXQ=
- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHlbm35QkR6xuZbeQuzxAnLDoWoTk9LXTMx34Wh2-0G05HnIjwp_2vyUqv-x3_zd0d6CU5YAYbI_p06oPacYqGzrFSufcDs8ZA-ZwRZxRcstoENWUTm47UWnDBZyCYIgwVu_1FGR-3XgSyaONrKggjSvyY=
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- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHThkcV9_D0u8LZKtAJxcBICHERz58urQDhS89j2fdBIO1Tu_UNGPpGOK-EAs5eVQ6xEG04OfHIhlmhCWnTLfbnAGoJYe15RI2qVrHiAWcQ6YewbjzPakSELfmLgLuMTLYJU3jNUz7zgm_9ezj-Lg==
- https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHbetcFiBW2X00CdvYwbhN8iRLLehGS1fYqzABBcs9_SVzL0L_ugbrdJ_e7LRk5gBHAQoRX7MzBlZwkZBDDKK3rgyZkxQ_BGqKccSlYFH0Mq59J_tEGD_G8WPEDU8OviOKQRpKO6KCxAoewa54ebIo5RxE=
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