Get SellProof

For dropshippers and online sellers in the EU and UK

See who already sells a product before you buy stock.

SellProof searches Meta's Ad Library in every country you sell to, counts only the ads really about your product and gives you a clear verdict on how seriously competitors sell it. One check instead of searching country by country by hand. One payment, no subscription.

Get SellProof for €39 Try the free demo

The demo runs in your browser with sample data. No account needed.

  • Uses Meta's official Ad Library API
  • Data stays on your computer
  • Windows, Mac and Linux
Product checkGermany, Poland, Netherlands, Spain
  • Real competitors found10
  • Most ads by one competitor251
  • Longest-running ad189 days
  • Shops selling it, with prices9
Worth testingSomeone already spends heavily to sell this.

Example results with sample data, the way SellProof shows them.

From product idea to a clear answer in three steps

Brands rarely keep paying for ads that lose money. So how many ads a brand runs about a product, and for how long, shows what sells.

  1. Describe your product

    A name, one sentence about it and, if you like, a photo. SellProof writes a ready-made prompt for ChatGPT, Claude or Gemini that suggests the search words for each country.

  2. Run the check

    SellProof searches Meta's Ad Library in the countries you sell to and keeps only the ads that are really about your product.

  3. Get a verdict

    Worth testing, Maybe: look closer or Not proven, with the reasons, the competitors behind them and what to do next. The report saves itself.

The right competitors, not just similar words

A plain Ad Library search returns everything that shares a word with your product. Search “LED Christmas tree” and you also get star projectors, real fir trees and furniture shops. Count those as competitors and every product looks proven. SellProof keeps only the ads that are really about your product.

  • Search words per country, in the language people there actually search in
  • Words an ad must contain and words that rule an ad out, so look-alikes don't count
  • “What it is” and “Not to be confused with” fields that keep the search on target
  • A ready-made AI prompt for ChatGPT, Claude or Gemini that fills all of this in for you. Add a product photo so the AI can see what you sell
  • A word check that warns you when a search word is likely to count the wrong ads

Plain search

Your product
Mini USB Christmas tree light
What gets counted
Tree lights, star projectors, real fir trees
Ruled out
Nothing
Verdict
Looks proven (wrong)

With SellProof

Your product
Mini USB Christmas tree light
What gets counted
Only mini Christmas tree lights
Ruled out
Star projector (“Not to be confused with”)
Verdict
Based on real competitors

Why not just use the free Ad Library?

You can, and SellProof reads exactly the same public data. The difference is the work it does for you.

Ad Library by handSellProof
CountriesOne search per country, one at a timeEvery country you sell to in one check
Which ads countEverything that shares a word with your productOnly ads really about your product
CompetitorsYou count each brand's ads yourselfCounted and sorted per brand, with their shops and prices
The answerYour gut feelingA verdict with the reasons and next steps
Over timeNo memory of what you saw last weekWhat each competitor launched, scaled and stopped since your last check
Your researchScreenshots and bookmarksSaved reports and a swipe file, on your computer

Three tools: check a product, find winning ads, watch competitors

✅ Check a product

Find out who already advertises your product, how many ads they run and for how long.

  • A clear verdict with the reasons behind it and the next steps
  • Your real competitors, sorted by how many ads they run about your product, how long the oldest has been live and how many people saw them
  • Inside their shops: for Shopify stores, the matching products, their prices and crossed-out “was” prices
  • Seasonal products like Christmas lights are judged on the last 12 months, so last season's sellers still count
  • Your product list saves itself: edit, copy and re-check any product whenever you want
SellProof product check: a green 'Worth testing' verdict, why, what to do next, three key numbers and the competitors table.
Check a product (sample data)

🏆 Winning ads

The ads that have run for weeks and reached the most people, in every country you sell to. Look inside your product's niche, or across every niche for ideas and formats.

  • See why each ad made the list: days running, number of copies, people reached
  • Hide big retailers like Lidl, Zalando and IKEA with one switch
  • Save the best ones to your swipe file in one click
Winning ads for Germany: each ad with days running, copies, people reached, the ad text and the shop.
Winning ads (sample data)

👀 Watch competitors

Add the brands you compete with. Every check shows what changed since the last one.

  • New ads: what they're testing right now, often brand-new products, with the product name and a link to their shop
  • Scaling: ads they copied more times since your last check, a strong sign they're putting money behind them
  • Stopped ads: what they switched off and how long it ran. An ad kept running for 30+ days was likely paying for itself: study those first
  • A trend line per brand: is their ad count going up or down?
Competitor watch results: new, scaling and stopped ads per brand, with the start date, product, shop link and people reached.
Watch competitors (sample data)

Under all three: every result is saved as a report automatically, and you can download it as a web page, a table (CSV) or Markdown. Works with Obsidian too.

Research 28 countries: the whole EU plus the UK

Meta publishes product ads for the EU and the UK in its Ad Library. SellProof covers every one of these countries. Pick the ones you sell to; you can change them any time.

  • ATAustria
  • BEBelgium
  • BGBulgaria
  • HRCroatia
  • CYCyprus
  • CZCzechia
  • DKDenmark
  • EEEstonia
  • FIFinland
  • FRFrance
  • DEGermany
  • GRGreece
  • HUHungary
  • IEIreland
  • ITItaly
  • LVLatvia
  • LTLithuania
  • LULuxembourg
  • MTMalta
  • NLNetherlands
  • PLPoland
  • PTPortugal
  • RORomania
  • SKSlovakia
  • SISlovenia
  • ESSpain
  • SESweden
  • GBUnited Kingdom

Not available for the US. Meta only shares product ads delivered in the EU and UK.

Map of Europe with the 27 EU countries and the UK highlighted.

Yours to keep. No subscription, no middleman.

Pay once, use it for good

One payment of €39. No monthly bill that keeps running while you're not researching. Early buyers get every update free.

Your data stays on your computer

Products, reports, competitor history and your swipe file are saved locally. SellProof has no server and no account with us: your searches go straight from your computer to Meta.

Your own free Meta access

SellProof connects to the Ad Library with your own free Meta developer app. The built-in guide walks you through it in about 10 minutes, once. Meta asks you to confirm your identity the first time.

A real desktop app for your computer

Light and dark mode, Guided mode for beginners and Pro mode with shorter labels for experienced sellers.

Windows

64-bit, with an installer

Mac

Apple Silicon (M1 and newer)

Linux

64-bit, AppImage

Good to know before you buy

What SellProof needs and what it can't do yet, so there are no surprises.

No US ads
Meta only publishes product ads for the EU and UK. If you only sell to the US, SellProof isn't for you yet.
A one-time setup
You connect your own free Meta developer app, about 10 minutes with the built-in guide. Meta asks you to confirm your identity the first time.
Meta's hourly limit
Meta allows each app a set number of searches per hour. SellProof shows how much of it you've used, and if Meta asks it to slow down, it waits and tries again by itself.
Your access renews every 60 days
Meta's access tokens expire after about 60 days. SellProof warns you two weeks before, and renewing takes about a minute.
No spend or sales figures
Meta doesn't publish how much an advertiser spends or sells. SellProof judges a product by what is public: how many ads, for how long and how many people saw them.
Mac: Apple Silicon only
Macs with Intel chips aren't supported yet.

Get SellProof

€XX
Regular price

[payment terms]

Get SellProof Try the demo first

Secure checkout by Lemon Squeezy · Download right after payment

What happens after you buy

  1. Pay by card, Apple Pay or Google Pay. Your download and licence key arrive by email.
  2. Install SellProof on Windows, Mac or Linux.
  3. Connect your free Meta account with the built-in guide, about 10 minutes once. Then run your first check.
  • Check a product, Winning ads and Watch competitors
  • All 28 countries (EU + UK)
  • Windows, Mac (Apple Silicon) and Linux
  • Reports as web page, CSV and Markdown, ready for Obsidian
  • Every future update, free for early buyers

Questions

Do I need a Facebook account?

Yes. SellProof uses your own free Meta developer app, made with your Facebook account. You don't need to run ads or pay Meta anything. The built-in guide takes about 10 minutes.

Why does Meta want to confirm my identity?

Meta asks everyone who uses the Ad Library API to confirm who they are, once. That's Meta's rule, not ours, and SellProof never sees your documents.

How does SellProof get the data?

Through Meta's official Ad Library API, with your own developer app and under the terms you accept from Meta during setup. It reads the same public ad data you can see at facebook.com/ads/library, country by country, without the clicking.

Does it work for the US?

No. Meta only publishes product ads delivered in the EU and UK. Check the country list above before you buy.

Can I try it first?

Yes. The free demo runs in your browser with made-up brands, ads and shops, so you can click through every tool before you buy. No account needed, and nothing is sent to Meta.

Is it a subscription?

No. You pay €39 once and keep the app. Early buyers get every update free.

Where is my data stored?

On your computer: products, reports and competitor history. SellProof has no server. Your searches go straight from your computer to Meta, and the shop check reads competitors' public Shopify product lists.

How many searches can I run?

Meta limits searches per app per hour. SellProof shows your usage in the sidebar, and if Meta asks it to slow down, it waits and tries again by itself. Searches you repeat on the same day reuse the results it already fetched (you can turn this off).

Does it work in my language?

The app is in English. It searches ads in every EU language: you (or the AI prompt) give it the search words people use in each country.

How does SellProof decide a product is worth testing?

It looks for brands that run many ads about your product for a long time. Ads cost money, so a brand that keeps them running for weeks is very likely selling. Worth testing means a competitor with 5 or more ads about your product runs 100 or more ads in total. You can change both numbers in Settings.

Which computers does it run on?

64-bit Windows, Macs with Apple Silicon (M1 or newer), and 64-bit Linux.

Check your next product before you order it.

Get SellProof for €39 Try the free demo