Bottom line: Seline is a small, privacy-first web analytics tool from a bootstrapped team in Warsaw. It tracks visits, sources and top pages without cookies, then goes further than most simple tools with visitor profiles, session journeys, funnels and revenue attribution through Stripe. On AppSumo it sells five lifetime tiers, from $59 once for 25,000 page views a month up to $599 once for 1,000,000. Seline’s own plan for 25,000 page views costs $14 a month, so the deal pays for itself quickly if the tool suits you. The catch is the allowance: it’s one monthly number per project, shared by any sites you link to it, and you can only move up a tier while the deal is live. The listing showed a “Deal ends in” countdown, with the page’s data setting the end for 1 November 2026. Refunds run 60 days, and the guarantee line reads “Plus members are covered by our We Got Your Back guarantee.”
Best for: bloggers, small SaaS teams and small businesses who want simple, cookieless stats plus funnels and revenue by channel, without a monthly bill.
Think twice if: you want session replay or heatmaps, need more than 1,000,000 page views a month, or want unlimited data retention.
We have no affiliate deal with Seline or AppSumo; links go to the official pages. How we review.
Updated 29 October 2026. This Seline review rests on what we read that day: the Seline listing on AppSumo, including all five tiers, the deal terms, the founder’s FAQ, questions and reviews, and Seline’s own pricing page with its price steps and FAQ. We haven’t installed the script on a site, so we describe the plans, the limits and what buyers report, not accuracy or load times.
Seline review at a glance
| What we checked | What the pages say |
|---|---|
| AppSumo tiers | $59, $129, $289, $399, $599 once |
| Monthly allowance | 25,000 to 1,000,000 page views, by tier |
| Websites | “Unlimited websites” on every tier |
| Data retention | “3 year data retention” on AppSumo; “Forever” on Seline’s own Pro plan |
| Seline’s own price | From $9 a month; 25,000 for $14 a month |
| Refund | “Refundable up to 60 days” |
| AppSumo guarantee | “Plus members are covered by our We Got Your Back guarantee” |
| Listing rating | 4.89 stars from 9 reviews |
| Deal end | “Deal ends in” countdown; page data ends it on 1 November 2026 |
What Seline does
You add one small script to your site (the founder’s FAQ on the listing calls it “~2KB”), and Seline starts counting visits, page views, bounce rate, sources and top pages in a real-time dashboard. It doesn’t use cookies, which is the main reason people pick tools like this. When you want analytics without a consent banner, that’s the line to check first: Seline’s own FAQ says it is “legally based and hosted in EU” and complies with GDPR, with “No cookies.”
The listing groups the rest into three jobs:
- Traffic detail: referrers, UTMs, countries, devices and top pages in one view, segment filters, and dashboards you can share through public links with a teammate or client.
- User journeys: identify signed-in users, build profiles with custom properties and Stripe data, trace session-by-session journeys, and tag users who look engaged or about to churn.
- Revenue: funnels that show where visitors drop off, plus revenue attributed to channels, UTMs and referrers, either through the Stripe integration or custom events.
Every AppSumo tier lists the same 11 features: unlimited websites, profiles and journeys, revenue analytics, ad-blocker bypass, advanced bot detection, a public API, live view, Seline AI, cookieless tracking, shareable dashboards and 3-year data retention. The listing names Google Tag Manager, Shopify, Stripe, Webflow and WordPress as integrations, and the helpful links include docs for the public API and an MCP server.
What it leaves out matters too. Asked in October 2026 about session replay, the founder replied: “no, we don’t have it and it’s not planned.” In another answer the same day they described a competing tool as “trying to do it all, having heatmaps, replays, etc.,” while Seline focuses on core things. So this is a focused analytics tool, not a product-analytics suite. If you’ve been hoping for replay to debug a checkout, skip the deal.
The allowance most people miss
Here’s the part most people miss, and it decides which tier you need. The plan cards give one number each: 25,000, 125,000, 275,000, 550,000 or 1,000,000 page views per month. That number belongs to one project, not to each website. The cards say “Unlimited websites,” and that’s true, but every site you add shares the same monthly allowance.
The founder spelled this out on 15 October 2026, replying to a buyer who had trouble activating their code: “It is per project (website), with an ability to link other projects or sites to it so share event limit. In short: you activate your appsumo code on your main project and then link other projects to it.” Seline’s own pricing FAQ says the same thing for its subscription: pricing is “per website,” but you can link a site to another with an active Pro plan “allowing them to share the event limit.”
There’s a second wrinkle in that wording. Seline’s own pricing page says “Pageviews and custom events share one monthly limit,” and counts its plans in events. The AppSumo cards only mention page views. When you plan to track sign-ups, purchases or button clicks as custom events, which is how funnels and revenue tracking work, it’s worth asking Seline whether those events count against your AppSumo allowance too. We couldn’t confirm it either way from the pages.
And don’t forget the timing. The deal terms say “you can upgrade while the deal is live but can only downgrade within 60 days of purchase.” Once the listing closes, the tier you hold is the tier you keep. In practice, that means when you guess low today, there’s no cheap fix next spring.
Plans and prices on AppSumo
The five tiers, read on 29 October 2026. Each is one code; the struck-through prices are the listing’s own “was” figures.
| AppSumo tier | Price once | Listing’s “was” price | Page views a month |
|---|---|---|---|
| License Tier 1 | $59 | $170 | 25,000 |
| License Tier 2 | $129 | $300 | 125,000 |
| License Tier 3 | $289 | $420 | 275,000 |
| License Tier 4 | $399 | $720 | 550,000 |
| License Tier 5 | $599 | $1,200 | 1,000,000 |
| Plan | Price |
|---|---|
| License Tier 1 Blogs and personal sites |
$59 once |
| License Tier 2 Small SaaS |
$129 once |
| License Tier 3 Freelancers with client sites |
$289 once |
| License Tier 4 Growing content sites |
$399 once |
| License Tier 5 Busy sites |
$599 once |
One-time prices on AppSumo, read 29 October 2026; the listing's struck-through prices are $170, $300, $420, $720 and $1,200, and the page showed the deal ending on 1 November 2026. Seline's own Pro plan is priced by monthly events: 25,000 for $14, 100,000 for $24, 250,000 for $34, 500,000 for $59 and 1,000,000 for $99 a month (two months free yearly), with a 7-day trial and no free plan.
Prices checked Oct 29, 2026 on Seline’s own pricing page. Lifetime deals are listings that can end or change, so check the live listing before you buy.
All five tiers carry the same feature list; only the monthly allowance changes. AppSumo marks Tier 3 as the recommended plan. Honestly, that label tells you nothing about your own traffic, so don’t use it as a shortcut.
The deal vs Seline’s own Pro plan
Seline sells one plan, Pro, priced by monthly volume. Its pricing page, read on 29 October 2026, lists these steps among others:
| Seline’s own Pro plan | Monthly billing | Yearly billing (per month) |
|---|---|---|
| 10,000 events | $9 | $7 |
| 25,000 events | $14 | $11 |
| 100,000 events | $24 | $20 |
| 250,000 events | $34 | $28 |
| 500,000 events | $59 | $49 |
| 1,000,000 events | $99 | $82 |
The page goes on to 20,000,000 events at $649 a month, offers a 7-day free trial with no card, and says plainly there’s no free plan. A done-for-you setup costs $99 once on top.
Two differences stand out. First, the AppSumo tiers sit a little above Seline’s own steps: 125,000 against 100,000, 275,000 against 250,000, 550,000 against 500,000. Second, Seline’s own Pro plan lists “Forever data retention” and “Priority human support.” The AppSumo tiers list “3 year data retention” and don’t mention priority support. So the lifetime deal isn’t quite the same plan as the subscription. Three years of history is plenty for most small sites, honestly, but if you’ve got a reason to keep raw analytics forever, that line matters.
Picking a tier: four worked examples
The sums below use only the page-view figures on the cards and Seline’s own monthly prices. If custom events turn out to count too, add them to your totals.
A personal blog at 15,000 page views a month. Tier 1’s 25,000 covers it with room to grow. Seline’s own 25,000 step is $14 a month, or $11 a month billed yearly, which is $132 a year. The $59 tier costs about what four months of monthly billing would.
A small SaaS with a marketing site and an app. Say the marketing site does 40,000 page views and the app another 50,000. Linked under one project, that’s 90,000 a month, which needs Tier 2 at $129. Seline’s own 100,000 step is $24 a month, so the deal covers its cost in a little over five months. If the app also sends sign-up and payment events, check how they’re counted before you settle on Tier 2.
A freelancer with four client sites at 50,000 page views each. Linked together, that’s 200,000 a month, so Tier 3’s 275,000 at $289 fits with headroom. Seline’s own 250,000 step is $34 a month. In practice, though, linking clients means one shared allowance and one account. One reviewer from an agency said they keep a separate client on “an affordable monthly subscription outside AppSumo,” which is a sensible way to keep billing apart.
A busy content site at 800,000 page views. Tier 5’s 1,000,000 is the only fit, at $599. Seline’s own 1,000,000 step is $99 a month or $82 a month billed yearly, $984 a year. Turns out the bigger the site, the faster the lifetime tier pays back, but also the bigger the risk if you outgrow 1,000,000, because there’s no Tier 6 to move into.
If you’re between two tiers, skip the guesswork and pull last year’s monthly peak from whatever tool you use now. Size for the busiest month, not the average.
What buyers report
The listing shows 4.89 stars from 9 reviews: eight five-star and one four-star. That’s a small sample from a deal that opened on 28 September 2026, so weigh it lightly. Turns out a near-perfect average from nine reviews says less than it looks; most people miss how far one unhappy month could move it.
Activation confused at least two buyers. A reviewer updated their review in mid-October 2026 after “getting the license issue sorted out,” saying the AppSumo activation “was a little confusing at first” but that the founder resolved it quickly. The founder’s reply says another buyer had the same issue and it “was sorted in 10 minutes.” The fix is the one quoted above: activate the code on your main project, then link the others. When you buy, don’t forget to note which project is the main one before you redeem.
The proxy feature gets praise. That same reviewer called the ability to serve analytics from your own domain the standout, since ad blockers often block analytics scripts. The listing calls this “Ad-blocker bypass.”
Simple, focused, and used. An October 2026 reviewer said the funnel feature lets them “define a conversion path in minutes.” Their two requests were deeper attribution for traffic from AI assistants like ChatGPT, and automated alerts when a page’s conversion rate shifts. A personal-site owner and a small indie team also praised the clean dashboard.
Answers so far. The founder answers on the listing under the name Kostya_Seline, often within hours. In October 2026 they confirmed Google Search Console data can be shown in Seline but called it “display only,” said the app has “just white mode,” and said there’s no public roadmap; feature requests go through a feedback form in the app. Two newer questions, one from 25 October about Clerk and Dodo Payments for sign-up and revenue attribution, and one from 28 October about tracking landing pages hosted on Kit, had no answer when we checked.
Company and founder
The listing says Seline was founded on 23 July 2024 in Poland, has 1-10 people, and is bootstrapped. The founder, Kostya Nesterovich, wrote on the listing that Seline “is used on around a 1000 of websites” and processes tens of millions of events daily. Seline’s own pricing FAQ explains why there’s no free plan: the team says subscriptions are its “only source of revenue” and it doesn’t sell or share data. A small team is no problem in itself, but it’s one more reason to use the refund window properly. If you’ve bought from tiny vendors before, you’ll know the usual pattern: quick personal answers while the deal runs, slower ones later.
The terms
The deal terms read:
- “Get lifetime access to Seline.”
- “All future Pro (Tiers 1-5) plan updates.”
- “If the plan name linked to your deal changes, it will automatically transfer to the new plan with all updates.”
- “Activate your license within 60 days—you can upgrade while the deal is live but can only downgrade within 60 days of purchase.”
- “Access to all future AI models may be provided at a discounted rate OR Access to future AI models may require an add on.”
The listing says “Refundable up to 60 days,” and the guarantee line reads “Plus members are covered by our We Got Your Back guarantee.” The update line maps every tier to Seline’s single Pro plan, which is clear. The AI line is the one to read twice: Seline AI is in today’s feature list, but future AI models may cost extra.
Seline vs Google Analytics, Fathom and Plausible
The listing names Google Analytics, Fathom and Plausible as the tools Seline replaces. Google Analytics is free; Seline’s own FAQ argues that’s because “Google makes money from advertising,” which is Seline’s framing, not ours. The practical difference is cookies: Seline says it uses none, so it fits sites that want to avoid a consent banner for analytics. Fathom and Plausible are the better-known privacy-first subscriptions. We didn’t price Fathom or Plausible for this review, so we can’t compare their bills. When you compare them, what we can say is that Seline pitches revenue attribution, user profiles and journeys alongside simple stats, and that’s the comparison to make when you read their pages.
Common mistakes with the Seline deal
Reading “Unlimited websites” as unlimited traffic. Every linked site draws from one monthly allowance.
Activating a code on the wrong project. Activate on your main project, then link the others to it, as the founder describes.
Ignoring custom events. Seline’s own plans count page views and custom events together. Ask how your AppSumo tier counts them before you build funnels.
Waiting to upgrade. You can only upgrade while the deal is live, and the page showed it ending on 1 November 2026.
Expecting session replay or heatmaps. The founder says replay isn’t planned.
Assuming forever retention. The AppSumo tiers say 3 years; Seline’s own Pro plan says forever.
Who Seline suits
A blogger or portfolio site. Tier 1 covers 25,000 page views a month, cookieless, for a one-time $59.
A small SaaS on Stripe. Profiles, journeys, funnels and revenue by channel are the reason to pick Seline over a plain counter.
A freelancer with a few client sites. Link them under one project, or keep clients on their own subscriptions.
A team that needs session replay, heatmaps or more than 1,000,000 page views a month. Skip it.
How to test it inside the refund window
- Activate on your main project and link a second site, to check the shared allowance works the way you expect.
- Run it next to your current analytics for two weeks and compare visit counts.
- Send one custom event and one Stripe payment, then ask support how both count against your tier.
- Build one funnel for your most important conversion path.
- Check your usage after week three and project the month; upgrade only while the deal is live.
What we couldn’t check
We didn’t install Seline, compare its counts with other tools or test the ad-blocker bypass. We couldn’t confirm whether custom events count against an AppSumo tier’s page-view allowance, what happens to an AppSumo code that goes over its monthly limit (Seline’s own FAQ describes its Pro-plan policy only), or how much future AI add-ons might cost. Settle those with support before day 60.
FAQ: Seline questions
Is Seline a one-time payment on AppSumo?
Yes. The five tiers cost $59, $129, $289, $399 or $599 once, for 25,000 to 1,000,000 page views a month, as listed on 29 October 2026.
Can I use one Seline code on several websites?
Yes. The cards say “Unlimited websites,” but the founder explains the allowance is per project: you activate the code on a main project and link other sites, which then share its monthly limit.
How long does Seline keep data on the AppSumo deal?
The AppSumo tiers list “3 year data retention.” Seline’s own Pro subscription lists “Forever data retention.”
Does Seline have session replay or a free plan?
No to both. The founder said session replay isn’t planned, and Seline’s own FAQ says there’s no free plan, only a 7-day trial.
The verdict
Seline is a focused, cookieless analytics tool that adds funnels, journeys and revenue attribution to the simple stats most privacy-first tools stop at, and the founder is visibly present on the listing. On price alone, the deal is easy to like: Tier 1 costs about four months of Seline’s own matching plan. What keeps the score down is the fine print around the allowance: one shared number per project, a page-view label next to a vendor that counts events, 3-year retention instead of forever, and an upgrade window that closes with the deal. Size your tier on your busiest month, test the event counting inside 60 days, and it’s a sound buy for a small site.
Seline on our desks
Our YouTube channels cover Seline from different angles. Each video opens on YouTube.
Guides on Business Software
- What Is Stacking on AppSumo? Codes, Tiers and LimitsStacking means buying more than one code for the same AppSumo deal to reach a bigger plan. It only works on code deals the partner allows, and only while the deal is live.
- Is AppSumo Plus Worth It? The $99 Break-Even, Worked OutAppSumo Plus costs $99 a year and takes 10% off every order, plus $100 in coupons on the annual plan. Here's the break-even sum with real deal prices, and who should skip it.
- What Happens If an AppSumo Product Shuts Down?When an AppSumo tool closes, the lifetime deal ends with it. Whether you get anything back depends on the listing's We Got Your Back line, your Plus status, the purchase date and a 30-day claim deadline.