Cometly vs Vemetric in 2026: Enterprise ad-to-ARR attribution vs a $5/month open-source analytics combo
One tool connects ad spend to closed-won revenue for B2B SaaS sales teams. The other tracks web and product analytics together for $5 a month. They barely compete for the same buyer.
Cometly
Vemetric- Cometly requires a sales call and usage-based pricing tied to website sessions. Vemetric has a free tier and a $5/month Professional plan with unlimited projects and seats.
- Cometly tracks the full funnel from ad click to closed-won ARR using CRM deal data. Vemetric has no ad attribution feature at all; it tracks web traffic and in-product user behavior.
- Both tools auto-detect AI referral traffic. Cometly names ChatGPT, Gemini, Grok, and Google AI Overviews specifically; Vemetric flags AI-sourced visitors more generally.
- Vemetric is open-source and self-hostable. Cometly has no open-source component and keeps its MCP integration and API access locked to the Enterprise plan.
- Vemetric combines web analytics and product analytics (funnels, user journeys) in one tool. Cometly has no product analytics; it is purpose-built for ad attribution.
- For B2B SaaS teams with real ad budgets who need revenue attribution, Cometly is the only real option here. For early-stage teams wanting cheap, privacy-first traffic and product data, Vemetric wins on price and simplicity.
Cometly and Vemetric both show up in Analytics & Reporting searches, but they solve different problems for different budgets. Cometly connects every ad click to pipeline and closed-won ARR for B2B SaaS companies running paid campaigns, with server-side tracking, AI traffic source detection, and an Enterprise-only MCP integration for Claude. Vemetric is an open-source, cookieless analytics tool that merges web traffic and product analytics into one dashboard, starting free and capping out at $5 a month for unlimited projects. If you are spending real money on Google or LinkedIn ads and need to know which campaigns produced revenue, Cometly is built for that question. If you want lightweight, privacy-first traffic and product data without paying enterprise prices, Vemetric is the better fit.
The tools at a glance
Cometly
B2B SaaS ad attribution that connects every campaign dollar to pipeline created and closed-won ARR.
Cometly is built for one job: telling a B2B SaaS marketing team which ad campaigns actually produced closed-won revenue, not just booked demos. It tracks sessions from first ad touch through the CRM pipeline to deal close, using server-side Conversion API tracking to recover data lost to ad blockers, and calculates LTV ROAS against real deal values rather than platform-reported conversions.
The AI traffic source tracking is a genuinely useful add-on: Cometly auto-detects visits from ChatGPT, Gemini, Grok, and Google AI Overviews and applies the same pipeline and ARR metrics to them as it does to Google Ads or LinkedIn Ads traffic. The MCP integration for Claude lets Enterprise customers ask natural-language questions about campaign performance without opening the dashboard.
None of this is cheap or fast to access. There is no public pricing, no self-serve signup, and the billing model is based on website sessions, which is hard to forecast for high-traffic sites. If your business is not B2B SaaS with a CRM-tracked sales pipeline, most of what Cometly does will not apply to you.
| Feature | Core Usage-based, contact for pricing | Enterprise Custom |
|---|---|---|
| Pricing model | Based on website sessions | Custom |
| Multi-touch attribution | Yes | Yes |
| Server-side / Conversion API | Yes | Yes |
| MCP integration | No | Yes |
| CRM and warehouse sync | No | Yes |
| Free trial | Unclear | Unclear |
Vemetric
Open-source, privacy-first analytics combining web traffic and product analytics in one cookieless platform.
Vemetric covers the two jobs most early-stage teams pay for separately: marketing site analytics and product analytics. It tracks how visitors arrive, follows them into the product after signup, and merges the pre- and post-signup activity into one user timeline. Funnel analysis supports up to 10 steps, and AI referral detection flags visits coming from tools like ChatGPT.
The pricing is aggressive by design: a usable free tier with 2,500 events and 1 month of retention, then $5 a month for unlimited projects and unlimited seats on the Professional plan. The codebase is open-source with 353+ stars on GitHub, and self-hosting is a supported option for teams that need full data control.
The tradeoff is maturity. Vemetric is a single-founder product with a thinner integration ecosystem and less documentation than established competitors like Plausible or Fathom, and there is no ad attribution feature of any kind, so it cannot answer the "which campaign paid off" question that Cometly is built around.
| Feature | Free $0/mo | Professional From $5/mo |
|---|---|---|
| Events per month | 2,500 | 10,000+ |
| Projects | 2 | Unlimited |
| Data retention | 1 month | 5 years |
| Funnels and user journeys | Yes | Yes |
| Open-source / self-hostable | Yes | Yes |
| Ad attribution | No | No |
Head-to-head feature comparison
| Feature | Cometly | Vemetric |
|---|---|---|
| Starting price | Usage-based, contact for pricing | $0/mo, then $5/mo |
| Free tier | No | Yes |
| Web traffic analytics | Yes | Yes |
| Product / user journey analytics | No | Yes |
| Funnel analysis | No | Yes |
| Ad-to-revenue attribution | Yes (pipeline to closed-won ARR) | No |
| AI referral traffic detection | Yes (ChatGPT, Gemini, Grok, AI Overviews) | Yes (general AI referral flagging) |
| Server-side / Conversion API tracking | Yes | No |
| Open-source / self-hostable | No | Yes |
| API access | Enterprise only | Yes |
| CRM or data warehouse sync | Enterprise only | No |
| Cookieless / GDPR-first | No | Yes |
| MCP / AI agent integration | Yes (Enterprise only) | No |
| Requires sales call | Yes | No |
Which should you choose?
CometlyVemetricVemetricCometlyVemetricCometlyThese two tools rarely show up in the same buying decision. Cometly is priced and built for B2B SaaS companies with a CRM pipeline and a real ad budget; the entire product exists to answer whether a specific campaign produced revenue 60 to 90 days later. Vemetric is priced and built for teams that have not reached that stage yet, or never will, because their business does not run on paid acquisition. Comparing them on price alone is misleading since Cometly is not competing to be cheap.
Bottom line
Book the Cometly demo if you are running paid B2B SaaS campaigns and cannot currently prove which ones produce closed-won revenue. Start Vemetric on the free tier if you want combined web and product analytics without an ad attribution use case, and move to the $5/month Professional plan once you outgrow the event limit.
Frequently asked questions
Is Cometly overkill for a small startup?
Yes, for most small startups Cometly is overkill. It is priced and designed around B2B SaaS companies with a CRM pipeline and meaningful paid ad spend. If you are pre-revenue or not yet running Google or LinkedIn ad campaigns, Vemetric or a simpler analytics tool will cover your needs at a fraction of the cost.
Can Vemetric replace Cometly for ad attribution?
No. Vemetric has no ad-to-revenue attribution feature and does not connect to CRM deal data. It tracks web traffic and in-product user behavior, but it cannot tell you whether a specific ad campaign produced closed-won ARR. That is Cometly's entire reason for existing.
Which tool is better for tracking AI-sourced traffic like ChatGPT visits?
Cometly has the more specific implementation, naming ChatGPT, Gemini, Grok, and Google AI Overviews as distinct tracked channels with pipeline and ARR metrics applied. Vemetric also detects AI referral traffic but with less granular breakdown by named AI platform.
Is Vemetric mature enough for a production SaaS product?
Vemetric is usable in production, but it is a newer, smaller product than established competitors, with a thinner integration ecosystem and less documentation. Teams that need broad third-party integrations or enterprise support should weigh that against the significant price advantage.
Does either tool require a sales call to sign up?
Cometly requires a sales call for both its Core and Enterprise tiers, with no public pricing or self-serve signup. Vemetric has no sales process at all; you can create a free account and start tracking immediately, then upgrade to Professional inside the product.