Semrush vs Similarweb
Zero of fourteen models named Semrush first on the direct prompt; zero named Similarweb. Semrush was named by thirteen of the fourteen models and Similarweb by thirteen and Semrush carries 27 labels and Similarweb 35, so the shares are not directly comparable.
Boston, United States, founded 2008. Named in ten categories this edition.
Named in five categories this edition.
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the market intelligence platforms page.
By framing
SemrushFirst choices, of fourteen modelsSimilarweb
Across every category in the October 2026 Edition, Semrush and Similarweb were named in the same answer 141 times, of the 407 answers naming Semrush and the 219 naming Similarweb. In those answers Similarweb took the first choice four times and Semrush eighteen.
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | |||||
| GPT-5.4 mini | | | ||||
| Gemini 3.5 Flash | | | | |||
| Perplexity Sonar | ||||||
| Grok 4.1 Fast | | | ||||
| Mistral Small | | |||||
| DeepSeek V4 Flash | | | ||||
| Llama 4 Maverick | ||||||
| Qwen 3.7 Flash | | | | |||
| Kimi K2 | | | ||||
| GLM 4.7 FlashX | | | | |||
| MiniMax M2.5 | | | ||||
| GPT-6 Luna | | | | |||
| Muse Glimmer 30B | | | |
Semrush Similarweb first choice named as an alternative argued againstblank: not namedEach cell is one answer, Semrush on the left and Similarweb on the right.The direct prompt
Neither was the first choice, one was named
3 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
11 of 14 modelsThe answer made no first choice from these two in this category.Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
Semrush9%#2 of 16Similarweb0%#13 of 16Semrush3%#6 of 12Similarweb3%#7 of 12Similarweb2%#11 of 14Semrush0%#14 of 14What the models said about Semrush
No label in this category carried a quote.
What the models said about Similarweb
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of four in this category shown.
“I would be cautious about using these as authoritative sources: - Similarweb and Semrush for exact competitor traffic, revenue, or market share.” GPT-6 Luna · negative prompt · soft negative
“Best Overall Budget Pick: Similarweb ... Widely regarded as the best market intelligence platform for its price.” DeepSeek V4 Flash · budget prompt · first choice
“Start with Similarweb's free data” GPT-6 Luna · budget prompt · first choice
“their free browser extension and basic web platform provide valuable high-level data on competitor traffic sources for free” Gemini 3.5 Flash · budget prompt · alternative
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.