Proofsource vs ZeroRank
ZeroRank offers 17 AI platforms and unlimited seats on every plan, at a published price, with a free report before any card. Proofsource reads four engines on every plan and attaches an interval and a drafted fix to every finding.
Proofsource and ZeroRank in five facts
Price
- Proofsource
- Free trial, then Custom from $64 per brand per month (final price discussed on demo call)
- ZeroRank
- Starter $89 a month ($76 billed yearly); Pro $199 a month ($169 billed yearly); Enterprise custom[1]
Free trial
- Proofsource
- 2 days free, 4 engines, no card
- ZeroRank
- A full report on your domain before you enter a card[1]
AI engines covered
- Proofsource
- 4 on the trial, all 10 on Custom
- ZeroRank
- Any of 17 platforms on every plan, including ChatGPT, Perplexity, Gemini, Google AI Overviews, Claude, Copilot, Grok and DeepSeek[1]
How often answers are re-read
- Proofsource
- Daily on Custom, or hourly
- ZeroRank
- Daily, or weekly, monthly and on demand[1]
Seats
- Proofsource
- Unlimited on Custom
- ZeroRank
- Unlimited on every plan[1]
What ZeroRank is, and who it is for
One job, priced by volume. ZeroRank says it does one job, AI visibility, and prices plans by how many answers you analyse rather than which platforms you may see. Every plan has unlimited seats and countries.[1]
Tracking plus content. Plans include prompt research runs, AI article generation and content optimisations each month, and an MCP server and REST API.[1]
Startups, SMEs, agencies. Starter targets growing startups and Pro agile SMEs; agencies get white-label dashboards and unlimited seats for clients.[1][2]
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 ZeroRank, fact by fact
Each ZeroRank cell links to the page it came from. Where ZeroRank does not publish a detail, the cell says so instead of guessing.
| Question | Proofsource | ZeroRank |
|---|---|---|
| Price | Free trial, then Custom from $64 per brand per month (final price discussed on demo call), arranged on a demo call | Starter $89 a month ($76 billed yearly); Pro $199 a month ($169 billed yearly); Enterprise custom[1] |
| Free trial | 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call | A full report on your domain before you enter a card[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 |     Google AI Overviews Copilot  Any of 17 platforms on every plan, including ChatGPT, Perplexity, Gemini, Google AI Overviews, Claude, Copilot, 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 | Daily, or weekly, monthly and on demand[1] |
| Seats | Unlimited seats on Custom, with client workspaces, scoped members, Client Viewer seats and SSO set up at onboarding | Unlimited on every plan[1] |
| How a number is measured | A 95% Wilson interval on every percentage; alerts wait until a change clears it | Prompts sampled repeatedly against the live models; answers, sources and tone read back[1] |
| What it does about a gap | Each gap names the pages the engine cited instead, with a draft fix held for your approval | Prompt research, AI articles and content optimisations each month; agentic workflows and a co-pilot[1][2] |
Where each shines
Both tools are built well for different teams. Each point is a strength, read from that vendor's own pages.
Where ZeroRank shines
- Seventeen platforms, no add-ons. Every plan can track any of 17 AI platforms with no per-model fees. Proofsource covers four on every plan and ten on Custom.[1]
- Unlimited seats at a published price. Clients and colleagues sit in the workspace at no extra cost, from the $89 Starter plan.[1]
- API from the first plan. The MCP server and REST API are part of Starter.[1]
Where Proofsource shines
- The interval, printed. ZeroRank samples prompts repeatedly and shows the pattern. Proofsource prints the 95% Wilson interval beside every percentage and holds alerts until a change clears it.[1]
- Root cause with every gap. Each Proofsource gap names the pages the engine cited instead and comes with a draft built on what those pages have, held for your approval.
- Two days of daily reads, free. 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call.
Proofsource or ZeroRank: the fair verdict
Pick ZeroRank if you want the widest platform list and unlimited seats at a published monthly price, with an API from day one.
Pick Proofsource if ChatGPT, Perplexity, Claude and Google AI Overviews are the engines that matter to you and you want each percentage with its interval and each gap with the page that won it.
Choose ZeroRank if you want
- Seventeen platforms, no add-ons
- Unlimited seats at a published price
- API from the first plan
Choose Proofsource if you want
- The interval, printed
- Root cause with every gap
- Two days of daily reads, free
Already using ZeroRank?
You do not have to choose on day one. Here is how teams run Proofsource beside ZeroRank and decide on their own data.
Keep ZeroRank running
Nothing about trying Proofsource needs you to stop ZeroRank. Your history and reports there stay where they are.
Bring your questions across
Export or copy the prompts you track in ZeroRank 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 ZeroRank: what buyers ask
What are the best alternatives to Otterly.AI for tracking brand recommendations in AI search?
When we asked AI engines this, some answers named ZeroRank, which tracks any of 17 platforms with unlimited seats from $89 a month. We have not verified Otterly.AI's current plans here; check its own pricing page.
Which AI platforms does ZeroRank track?
Its pricing page lists 17, naming ChatGPT, Perplexity, Gemini, Google AI Overviews, Claude, Copilot, Grok and DeepSeek among them.
Can I try ZeroRank or Proofsource before paying?
ZeroRank runs a full report on your domain before you enter a card. Proofsource's trial: 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card.
Where each fact about ZeroRank comes from
- ZeroRank pricing and FAQ, read 5 Oct 2026.
- ZeroRank homepage, read 5 Oct 2026.
Vendors change their pages. If a ZeroRank 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
