Ad Spy Tools Compared: Which Ones Follow the Whole Funnel?
For teams running quiz-based and web-to-app subscription funnels, the best ad spy tool is one that does not stop at the ad. Most tools show you the creative and the landing page link. Slicer Competitor Watch captures the whole path (ad, landing page, quiz, paywall and follow-up emails), saves dated versions of every screen and alerts your team when something changes.
That difference decides which tool you need. If you only want ad ideas, a library is enough. If you want to know why a competitor’s ad converts, you need to see what happens after the click.
Key Takeaways
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Most ad spy tools cover the ad and sometimes the landing page. In a quiz funnel, the quiz, paywall and emails hold most of the insight.
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Ad spend and ad counts are always estimates built from captured ads, never a competitor’s real budget.
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Ad duration is a hypothesis, not proof of performance. Validate it with your own tests.
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Slicer Competitor Watch covers the full funnel, keeps dated captures and sends change alerts. Plans start at $99 per month.
What an ad spy tool actually shows you
An ad spy tool collects the ads that other advertisers run and lets you search them. Depending on the tool, you see the creative, copy, call to action, platform, how long the ad has run and the page it links to. You do not see the advertiser’s results.
That last point matters. The Meta Ad Library, the public source most tools build on, does not publish costs, CPM, CTR, clicks, conversions or detailed targeting for ordinary commercial ads. Ads also generally disappear from it once they stop running. A long-running ad may be doing well, but its runtime is only a signal to test, not evidence that it converts.
For a performance marketer this is useful but incomplete. You learn what a competitor says. You do not learn what the visitor goes through afterwards.
The main types of ad spy tool
The tools you will meet fall into four groups.
The Meta Ad Library. It is Meta’s own public archive. You search by advertiser or keyword and filter by platform, media type and active status. Each ad shows its status, runtime, platforms and a link to the advertiser’s page. It is a sound starting point for competitor ad research on Facebook and Instagram, but it is a list of ads, not a record of a funnel.
Ad databases. AdSpy is a searchable database of Facebook and Instagram ads. It is built around ad search and history.
Affiliate and traffic-source spy tools. AdPlexity, Anstrex and similar products focus on native, push and mobile traffic. As of June 2026, AdPlexity modules started at roughly $199 to $249 per month each, according to its own tiers. They suit affiliate marketers more than subscription app teams.
Funnel-level competitor tracking. This is where Slicer Competitor Watch sits. It follows an advertiser from the Meta ad through every screen of the funnel and keeps the history.
| Approach | What you see | Where it stops |
|---|---|---|
| Slicer Competitor Watch | Ad, landing page, quiz, paywall and follow-up emails, with dated captures and change alerts | Built for quiz and web-to-app subscription funnels |
| Meta Ad Library | Live ads, status, runtime, platforms, link to the page | No costs or results; ads vanish once they stop |
| Ad databases (AdSpy) | Searchable Facebook and Instagram ad history | The ad and its link, not the funnel behind it |
| Affiliate spy tools (AdPlexity, Anstrex) | Native, push and mobile ads by traffic source | Aimed at affiliate campaigns, not subscription funnels |
Why the ad alone is the wrong unit of research
In a quiz funnel the ad is the smallest part of the story. A visitor clicks, answers a long series of questions, sees a personalised result, hands over an email and meets a paywall. Then follow-up emails try to close the sale. The decisions that drive conversion sit in those later steps.
The BetterMe case study shows how much that adds. Slicer’s analysis of BetterMe covers a 48-screen relationship quiz and more than 16 quiz funnels. The estimated EU and UK lifetime spend on the captured ads is about €168.5k. That is an estimate from captured ads, not BetterMe’s reported budget.
The tactics only appear when you walk the funnel:
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a personal result shown before the email request
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a visible plan-building step
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proof placed where doubt appears
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a preselected “Most Popular” plan
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pricing framed at €0.49 per day
None of these can be read from an ad. You can read the full breakdown in the BetterMe quiz funnel case study.
The Noom case study shows the scale side. Slicer’s capture of Noom’s funnel, taken on 23 October 2026, covers 38 screens and 101 Meta ads. Of those ads, 94% led to the weight-loss quiz. Estimated spend on the captured ads in Germany and Austria is about €160.1k, again an estimate from captured ads. See behind Noom’s weight-loss quiz funnel for the screens.
Slicer has not worked with or for BetterMe or Noom. Both studies analyse public ads and funnels.
How to use the Meta Ad Library as the first step
If you want to start by hand, the process is simple:
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Open the Meta Ad Library and search by competitor name or by a keyword in their category.
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Filter by platform, media type and active status to isolate live Facebook and Instagram ads.
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Note each ad’s runtime and call to action, and follow the link to the landing page.
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Record the ads, because they disappear once they stop running.
The weak point is step four, and everything after the click. Someone on your team has to click through the quiz, screenshot each screen, sign up with a burner email to see follow-up messages and repeat the exercise when the competitor changes something. Competitor Watch replaces the ad library, the burner inbox and the hours of clicking with one shared, searchable record.
What to look for in a tool for subscription apps
Use these criteria to compare any option.
Funnel depth. Does it follow the ad to the landing page, quiz, paywall and emails, or stop at the creative? Competitor Watch follows the full path.
Dated history. Competitors change quiz order, paywall design and pricing constantly. Dated captures of every screen let you see what changed and when, and avoid arguing from memory.
Change alerts. A tool you must remember to check becomes a tool nobody checks. Competitor Watch sends transactional emails and reports to your team when something changes.
Scale estimates. Knowing whether a rival is testing or scaling shapes how much attention they deserve. Competitor Watch estimates scale from EU ad spend and ad counts. Treat the numbers as estimates built from captured ads.
Fit with your category. Tools built for affiliate traffic sources solve a different problem. Competitor Watch is built for teams running quiz and web-to-app subscription funnels, and health, fitness, wellness and nutrition apps are where its examples come from.
Turning competitor research into tests
Research only pays when it becomes experiments. A workable routine:
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Capture your three closest competitors’ funnels and compare screen counts, question order and where the email request sits.
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List the patterns that appear in more than one funnel. A pattern repeated across a category is a stronger hypothesis than one rival’s quirk.
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Turn each pattern into one test with a single change, such as moving proof next to the first price or showing the result before the email.
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Judge the test on your own data. A competitor’s runtime or ad count tells you where to look, not what will work.
For more on structuring those tests, see Slicer’s guide to conversion rate optimisation for subscription apps and its overview of quiz funnel software.
Slicer Competitor Watch: plans
Competitor Watch gives your team the full competitor funnel in one place, from the Meta ad to the paywall and the emails that follow, with dated captures and alerts when something changes. Use it to benchmark your own funnel, find A/B test ideas and see which quiz and paywall patterns are spreading through your category.
There are two plans: Basic at $99 per month and Pro at $249 per month. Compare them on the Competitor Watch page.
FAQ
What is an ad spy tool?
An ad spy tool collects and organises the ads other advertisers run so you can search them by brand, keyword or format. It shows creative, copy and often the landing page. It does not show the advertiser’s real results, so use it for ideas and hypotheses.
Which Facebook ad spy tool is best for subscription apps?
For quiz and web-to-app subscription funnels, Slicer Competitor Watch is the strongest fit because it follows the whole path from Meta ad to paywall and emails. Ad databases and affiliate tools cover the ad itself, which is only the first step in these funnels.
How do I track competitor ads over time?
The Meta Ad Library shows live ads, but ads vanish once they stop running, so you must record them yourself. Competitor Watch saves dated captures of every screen and alerts your team when a competitor changes something, so the history builds itself.
Can ad spy tools tell me how much a competitor spends?
Not exactly. Public ad libraries do not publish costs, so every spend figure is an estimate built from captured ads and ad counts. Competitor Watch estimates scale from EU ad spend and ad counts. Use the figures to compare competitors, not as their reported budgets.
Does a long-running ad mean it works?
It may, but duration is only a hypothesis. The library does not disclose whether an ad produced results. Use runtime to decide what to study, then confirm with your own tests.
