A Seline Analytics alternative that's free on one site

Last checked: 29 October 2026. Seline facts come from seline.com (seline.so redirects there) on that date and can change; the sources are listed at the end. Prices may change; see Seline pricing. "Unconfirmed" means the fact wasn't on Seline's own pages that day. It doesn't mean the feature is missing. See all comparisons, including Google Analytics.

In short#

• Both are cookieless-by-default web analytics with one script tag, funnels, Search Console data and revenue attribution from Stripe and Polar.
• Revenue. Seline matches a Stripe charge to a visitor by email (setUser()) or a visitor ID in Checkout metadata. Recurring charges stay with the original visitor. traffic.cx does the same job with a pageview ID, also connects Lemon Squeezy and Dodo Payments, and lets you choose last non-direct or first touch.
• Getting started. Seline has a 7-day trial with no card and no free plan. traffic.cx is free on one site with every feature, revenue attribution included, no card. Sign up with Google or email.
• Where Seline is stronger. Visitor profiles and journeys, EU hosting, unlimited data retention on Pro, Shopify checkout tracking, and an AI chat and MCP interface.

What's the same#

Revenue attribution from Stripe and Polar#

This is the closest comparison on the list. Seline connects Stripe and Polar with a read-only key and shows which referrers and UTM campaigns bring revenue, and it keeps recurring Stripe charges with the original visitor (Seline docs). traffic.cx does both of those too. The differences are in the details below, not in whether revenue attribution exists.

Cookieless by default, with an optional cookie mode#

Both count visitors without a cookie by default using a daily-rotated identifier, and both offer an opt-in cookie mode for longer journeys (Seline privacy, traffic.cx privacy notice). This is parity, not an advantage. Whether you need consent depends on your setup and the rules that apply to you, especially because revenue attribution links payments to visits.

Simple dashboard, funnels and Search Console#

Both show sources, UTMs, pages, countries and devices on one screen, with funnels, custom events and Google Search Console keywords (Seline docs, traffic.cx Search Console).

Where traffic.cx is different#

A Free plan on one site#

Seline has no free plan. It starts with a 7-day trial with no card, as of 29 October 2026 (Seline pricing). traffic.cx's Free plan has every feature, revenue attribution included, on one site, with no card and no end date (pricing). Sign up with Google or email.

Lemon Squeezy and Dodo Payments, as well as Stripe and Polar#

traffic.cx connects Stripe, Lemon Squeezy, Polar and Dodo Payments in Settings → Revenue. Stripe and Polar connectors were found in Seline's docs. For other providers Seline suggests sending revenue as a custom event (Seline docs). With Polar, Seline attributes revenue only when you pass customer emails through profiles (Seline docs). traffic.cx uses the pageview ID for every provider (how it works).

Refunds, unmatched payments and past payments#

Refunds are subtracted on the day they happen and credited to the payment they refund. A payment that can't be linked to a visit stays in your totals as "Unattributed" instead of going to a guessed source. Connecting Stripe, Lemon Squeezy, Polar or Dodo Payments imports that provider's last 90 days of payments. Those older payments will mostly be Unattributed. Refund handling and a historical import were not described in Seline's docs as of 29 October 2026.

Two attribution models with a configurable lookback#

The Revenue page compares sources by revenue, paying customers, conversion rate and revenue per visitor, and toggles between last non-direct (the default) and first touch, with a 90-day lookback by default (7 to 365 days) (revenue attribution). No attribution model setting was found in Seline's docs.

One honest caveat. In the default cookieless mode, a pageview ID links a payment to the visit where checkout started. Visitor IDs rotate daily, so a purchase can't be connected to a campaign visit on an earlier day unless you turn on the optional cookie mode (same browser only) or the customer has paid before (cookieless versus cookie mode).

Where Seline Analytics is the better choice#

• Visitor profiles and journeys. Seline turns identified visitors into profiles with their journey and their latest Stripe or Polar subscriptions and payments (Seline docs). traffic.cx has no visitor profiles.
• EU hosting. Seline is based in Poland and hosts its servers and databases in the EU with Hetzner (Seline privacy). traffic.cx's server is in Mumbai, India, and it doesn't promise EU-only hosting.
• Unlimited history. Seline's Pro plan keeps data "forever" (Seline pricing). traffic.cx's paid plans keep your full history too, but its Free plan shows only the last 30 days.
• Shopify. Seline has a Shopify guide with a custom pixel that tracks checkout pages and purchase revenue (Seline docs). traffic.cx has no Shopify or WooCommerce connector.
• AI chat and MCP. Seline can answer questions about your data in-app or through MCP (Seline). traffic.cx has neither.
• Done-for-you setup. Seline offers a one-off $99 setup service, with a Pro plan still required (Seline pricing).

Pricing#

Sign up with Google or email and start on the Free plan: every feature on one site, no card and no trial clock. The Free plan is $0, forever: every feature on one site, 3,000 events a month, the last 30 days. Paid plans add more events, more sites, your full history, the API and teams. See pricing for the volume tiers.

Seline has one Pro plan priced by monthly events, from $9/month for 10,000 events ($14 for 25,000; $24 for 100,000; $99 for 1,000,000), with two months free on yearly billing. A 7-day free trial with no credit card, and no free plan (seline.com/pricing), as of 29 October 2026. Prices may change. Check Seline pricing for the current numbers.

How to switch from Seline Analytics#

These steps come from the install guide, the revenue docs and the provider guides.

1. Keep what you need. traffic.cx can't import Seline or any other analytics tool, so your history starts when you install the script. Seline's Public API returns your stats, and its AI chat can produce CSVs (Seline API). Export what you want before you cancel.

2. Sign up and add your site. Sign up with Google or email, add the site with its real domain and copy the snippet from Settings → Tracking.

3. Install the script. Put this once in the shared head, with the full tcx_ ID. Don't add manual pageview calls on route changes. The tracker follows single-page navigation.

   html

   <script defer src="https://traffic.cx/js/YOUR_SITE_ID.js"></script>

4. Verify your first visit on your published domain. Localhost and iframes are ignored by default.

5. Recreate your events as goals. Replace seline.track('name') calls with window.trafficcx?.('name') and create a matching custom-event goal in the dashboard. Revenue events may not be needed once payments sync.

6. Connect payments and pass the pageview ID. In Settings → Revenue, connect your provider, then add trafficcx.pageviewId() to your checkout metadata next to any seline_visitor_id, and to the subscription's metadata for renewals. Test with your provider's test mode on a separate traffic.cx test site. Connecting Stripe, Lemon Squeezy, Polar or Dodo Payments imports that provider's last 90 days of payments. Those older payments will mostly be Unattributed.

7. Run both while you compare, then remove the Seline script. traffic.cx is safe to run alongside Seline's script. It keeps to its own window.trafficcx global and tcx_ storage, and it adds to the browser's page-change handling instead of replacing it.

Sources#

traffic.cx facts come from pricing, the home page, privacy, how revenue attribution works (updated 14 Oct 2026), revenue attribution, plans (updated 25 Oct 2026), the docs index, install (updated 14 Oct 2026), Search Console and the provider guides for Stripe, Lemon Squeezy, Polar and Dodo Payments, checked 29 Oct 2026. Each of those guides says connecting imports the last 90 days. The operator line is the site footer. The Free plan numbers come from the same plan catalogue as pricing.

Seline facts come from these pages, as of 29 Oct 2026. seline.so redirects to seline.com:

• Pricing (plan, prices, FAQ, footer address)
• Home (features, journeys, profiles, funnels, AI chat, "Founded in 2024")
• Stripe
• Polar
• Revenue tracking
• Shopify
• Install (cookie mode)
• Privacy (daily salt, Hetzner EU hosting)
• GDPR ("legally based in Poland (EU), hosted in Germany (EU)")
• Google Search Console
• API
• Custom events
• Ingest events