Proofsource vs Similarweb
Similarweb tells you how much traffic AI engines send you and your rivals. Proofsource tells you which buyer questions name you on each engine, who gets named instead, and what to fix. Different questions, and some teams need both.
Proofsource and Similarweb in five facts
Price
- Proofsource
- Free trial, then Custom from $64 per brand per month (final price discussed on demo call)
- Similarweb
- $99 for AEO Intelligence (1 user, 150 tracked prompts, 3 months of history); $333 and $542 tiers add SEO, competitive and ad intelligence; billing period not stated[1]
Free trial
- Proofsource
- 2 days free, 4 engines, no card
- Similarweb
- A free trial on every plan; length not published[1]
AI engines covered
- Proofsource
- 4 on the trial, all 10 on Custom
- Similarweb
- Not stated for brand visibility; its AI traffic trackers name ChatGPT, Perplexity, Gemini, AI Mode, Claude, Grok and DeepSeek[1]
How often answers are re-read
- Proofsource
- Daily on Custom, or hourly
- Similarweb
- Not published
Seats
- Proofsource
- Unlimited on Custom
- Similarweb
- 1 user on each self-serve plan[1]
What Similarweb is, and who it is for
Two modules in one product. Similarweb, best known for website traffic data, sells AI Search Intelligence on its own. AI Brand Visibility reports how often LLM answers mention you against competitors across tracked topics, with prompt tracking, citation analysis down to the exact link, and sentiment. AI Traffic measures the referral visits LLMs send to your site and to competitors' sites.[1]
Traffic data alongside answers. The AI Traffic half comes from Similarweb's traffic data rather than from asking the engines questions, and it can show competitor landing pages that receive AI traffic.[1]
Plans named for the job. Its three self-serve plans are labelled for researchers and analysts, for marketers and SEO managers, and for performance marketers. The fit is strongest for a team that already reads Similarweb for traffic and competitive research and wants AI visibility in the same login.[1]
Proofsource is an AI intelligence platform that shows which buyer questions name your brand in ChatGPT, Perplexity, Claude and Google AI Overviews, who gets named instead, and exactly what to fix.
Proofsource and Similarweb, fact by fact
Each Similarweb cell links to the page it came from. Where Similarweb does not publish a detail, the cell says so instead of guessing.
| Question | Proofsource | Similarweb |
|---|---|---|
| Price | Free trial, then Custom from $64 per brand per month (final price discussed on demo call), arranged on a demo call | $99 for AEO Intelligence (1 user, 150 tracked prompts, 3 months of history); $333 and $542 tiers add SEO, competitive and ad intelligence; billing period not stated[1] |
| Free trial | 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call | A free trial on every plan; length not published[1] |
| AI engines covered | ChatGPT, Perplexity, Claude and Google AI Overviews on the trial. Custom covers all 10 engines, adding Google AI Mode, Gemini, Microsoft Copilot, Grok, DeepSeek and Meta AI, switched on at onboarding |       Not stated for brand visibility; its AI traffic trackers name ChatGPT, Perplexity, Gemini, AI Mode, Claude, Grok and DeepSeek[1] |
| How often answers are re-read | Daily on Custom by default, one answer per question per engine per UTC day, or hourly or any frequency you choose; the trial reads every engine on 2 consecutive days | Not published |
| Seats | Unlimited seats on Custom, with client workspaces, scoped members, Client Viewer seats and SSO set up at onboarding | 1 user on each self-serve plan[1] |
| How a number is measured | A 95% Wilson interval on every percentage; alerts wait until a change clears it | AI Brand Visibility is the percentage of analyzed AI responses that mention your brand[1] |
| What it does about a gap | Each gap names the pages the engine cited instead, with a draft fix held for your approval | Citation analysis with the exact links, sentiment by topic, AI referral traffic, and an AI SEO agent that drafts an SEO strategy[1] |
Where each shines
Both tools are built well for different teams. Each point is a strength, read from that vendor's own pages.
Where Similarweb shines
- It measures the visits AI sends. AI Traffic shows how much traffic ChatGPT, Perplexity, Gemini and AI Mode send to you and to competitors, from Similarweb's own data. Proofsource measures the AI-referred visits to your own site from GA4 and Cloudflare, not your competitors' traffic.[1]
- One login for several jobs. The two higher tiers fold AI visibility into Similarweb's long-established SEO, competitive and advertising intelligence suites.[1]
- A price you can read off the page. All three AI Search plans show a price and a free trial, with no call needed to start.[1]
Where Proofsource shines
- A named engine panel. Proofsource reads ChatGPT, Perplexity, Claude and Google AI Overviews on every plan and all 10 engines on Custom. Similarweb's AI Search page does not say which engines its brand visibility module asks.
- An interval on every share. Every Proofsource percentage carries a 95% Wilson interval, so a move is either real or flagged as noise before anyone reports it.
- A drafted fix per gap, and seats for the team. Each gap names the pages the engines cited instead and comes with a draft held for your approval. Custom includes unlimited seats, against 1 user on each Similarweb self-serve plan.
Proofsource or Similarweb: the fair verdict
If the question in the room is how much traffic AI engines send you and your rivals, and you already work in Similarweb, its AI Search Intelligence answers it from data Proofsource does not have.
If the question is which buyer questions name you on each engine, whether a change is real, and which page to fix first, Proofsource is built for exactly that.
They measure different things, and the traffic view and the answer view sit well side by side.
Choose Similarweb if you want
- It measures the visits AI sends
- One login for several jobs
- A price you can read off the page
Choose Proofsource if you want
- A named engine panel
- An interval on every share
- A drafted fix per gap, and seats for the team
Already using Similarweb?
You do not have to choose on day one. Here is how teams run Proofsource beside Similarweb and decide on their own data.
Keep Similarweb running
Nothing about trying Proofsource needs you to stop Similarweb. Your history and reports there stay where they are.
Bring your questions across
Export or copy the prompts you track in Similarweb and add them as buyer questions in Proofsource, so both tools ask the same things.
Run both side by side
Read the two for the same days on your own domain. Where the numbers differ, Proofsource shows the answers and the pages each engine cited, so you can see why.
Keep what serves your team
Many teams keep one tool for reporting and another for fixes. Pick on your own evidence, not on a comparison page.
Proofsource or Similarweb: what buyers ask
How can I monitor where AI assistants recommend my company versus competitors in my category?
Track a fixed set of buyer questions on each engine and compare how often you and each competitor get named. Similarweb does this through prompt tracking inside topics, reported as your share against competitors. Proofsource does it per buyer question on ChatGPT, Perplexity, Claude and Google AI Overviews, shows who gets named instead of you, and re-reads daily on Custom.
How do I get a single score that measures how often AI tools mention my brand compared to competitors?
Use the share of answers that name you, computed the same way for every brand. Similarweb's AI Brand Visibility is the percentage of analyzed AI responses that mention your brand. Proofsource reports the share of buyer questions that name you on each engine with a 95% Wilson interval, so a lead smaller than the noise is not read as a lead.
What AI visibility tools give a normalized score so I can compare my brand's AI presence to the market leader?
Any tool that scores every brand on the same questions and the same denominator gives you a fair comparison with the leader. Similarweb and Proofsource both report a share of answers per brand. Proofsource adds the interval around each share, which shows whether the gap to the leader is wider than day-to-day churn.
Which AI engines does Similarweb's brand visibility cover?
Similarweb's AI Search Intelligence page does not list them for brand visibility; its traffic trackers name ChatGPT, Perplexity, Gemini, AI Mode, Claude, Grok and DeepSeek. Proofsource reads ChatGPT, Perplexity, Claude and Google AI Overviews on every plan and all 10 on Custom.
Is there a free trial of Similarweb or Proofsource?
Both offer one. Similarweb shows a free trial on every AI Search plan without publishing its length. Proofsource's trial: 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call.
Where each fact about Similarweb comes from
- Similarweb AI Search Intelligence: features, plans and FAQ, read 5 Oct 2026.
Vendors change their pages. If a Similarweb fact here no longer matches their site, tell us through the contact page and we will correct it.
Your own trial settles this faster than any comparison page.
200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, and the report is about your domain: which buyer questions name you, who gets named instead, and what to fix.
Google AI OverviewsGoogle AI Mode
