Friends say yes
They want to be kind. A stranger who signs up, or reaches for a card, is the only opinion that counts.
Real ads · Real visitors · A clear verdict
Will people pay for your idea? Know in 7 days.
Before you spend months building, we test your idea on real buyers: a landing page, €100 of ads, and a plain report with the numbers and our verdict.
Full refund until you approve the page. Secure payment by Stripe.
- €249 ads included
- Results in 7 days
- Pass mark agreed first
From the team that built and runs nexodyne.org, zgaparo.ge and six more live products. See our work
DAY 7 · DEMAND REPORT
EXAMPLE
The idea
“Birthday cakes for offices, ordered online by 10 am.”
- Visitors
- 286
- Sign-ups
- 31
- Sign-up rate
- 10.8%
- Cost per sign-up
- €3.23
Sign-ups per day of ads
Verdict
Go
The pass mark was 8%. Next: build the order page.
Open the full sample report
The problem
The costliest mistake is building something nobody wants
Surveys flatter
Saying “I’d buy that” costs nothing. Clicking, signing up or pre-ordering takes real interest, so that is what we measure.
Building first is slow
Months of work and thousands of euros before the first real answer. A sprint gets you that answer in a week.
Test first. Build what people have already asked for.
How it works
From your idea to a clear answer in 7 days
-
01
Tell us the idea
3 minutes
Answer 6 short questions and pay. Within one working day we email your test plan: the page, the ad channel and the pass mark.
-
02
Your page
Day 1
We write and build a landing page that explains your offer and asks for one real step: a sign-up, a waitlist place or a refundable pre-order. You approve it.
-
03
Real ads
Days 2–6
We run €100 of ads where your buyers already are: Google Search, Meta, TikTok or Reddit. We check them every day and fix what isn’t working.
-
04
The verdict
Day 7
You get the report: the numbers, what people searched and asked, and our verdict against the pass mark. Go, rework or stop. Then a short call.
Rather do it yourself? Read our free guide to testing an idea
What you get
A plain answer, with the numbers to back it
Every sprint ends with a short report you can act on, or show to a partner or an investor.
- A landing page that explains your offer and asks for one real step
- €100 of ads, set up and checked daily, included in the price
- The numbers: visitors, clicks, sign-ups and the cost of each sign-up
- What people did and said: their searches, their questions, and where they left
- Our verdict: go, rework or stop, with the next step
- A 20-minute call to go through it together
- Yours to keep: the page, the sign-up list and the data
- See a full sample report
INSIDE THE REPORT
EXAMPLE
- Top searches
office birthday cake delivery
,order a cake for work
- People asked
Do you do gluten-free?
Can it arrive before 10?
- Why some left
- The price for a team of 20
- Best ad
A cake on every desk by 10 am
, 12.4% sign-ups- Next test
- A €39 team price, with a gluten-free option
Prices
One price. The ads are included.
Pay once, when you book. No ad accounts to set up, no hourly rates, no surprises.
Quick check
A first signal for a simple idea.
€149
Report in 5 days
Includes €50 of ads over 3 days
- One landing page
- One ad channel
- The numbers and our verdict
- The report by email
Recommended
Sprint
The full test for one idea.
€249
Report in 7 days
Includes €100 of ads over 5 days
- Everything in Quick check
- A pass mark agreed before the ads
- Up to two ad channels
- Searches, questions and where people left
- A 20-minute results call
Head-to-head
Two versions. One winner.
€449
Report in 10 days
Includes €200 of ads over 7 days
- Everything in Sprint
- Two pages: two angles or two prices
- Visitors split evenly between them
- Which one wins, and by how much
- A 30-minute results call
If the answer is go, we build it.
Nexodyne Studio, our build team, turns a winning test into a working site or app for a fixed price, and takes your sprint fee off that price.
Our promise
- Pass mark first. We agree what counts as a yes before the ads start.
- Every euro shown. The ad budget goes to your test, and the report shows the spend.
- Yours to keep: the page, the sign-up list and the data.
Secure payment by Stripe: card, Apple Pay or Google Pay, in full when you book. Full refund until you approve the page. Terms
Our work
We build and run our own products too
The team behind Proof made all of these and runs them today. Getting strangers to sign up is our daily work.
Web app · English
Nexodyne
A platform for parents: a short family assessment, then a plan and games to play together.
See it live
Web app · Georgian
Zgaparo
Georgian audio fairy tales for children, for bedtime and car journeys. It installs on a phone like an app.
See it live
Online shop · English
BacktoClass
A US shop for the school year: backpacks, desks, whiteboards and supplies.
See it live
Web app · 6 languages
IQ evaluation
A 40-question IQ test with an instant score, a percentile and a profile of six thinking skills.
See it live
Web app · English
TrueTales
Audio bedtime stories for American families, with a free trial and a monthly subscription.
See it live
Online shop · English
ECHOES
Limited-run graphic tees and hoodies: each design is printed once, then it is gone.
See it liveIs this for you?
A sprint works best when you…
A good fit
- Have an idea and a rough price in mind
- Can say who would buy it
- Want an answer before you spend months building
- Will take a “no” as a useful result
Not a good fit
- You want a promise of sales: a test measures interest, it can’t guarantee it
- Products the ad platforms restrict, such as gambling, adult content or medicines
- You will build it whatever the numbers say
Start a sprint
Tell us the idea. We test it on real buyers.
6 questions, about 3 minutes. Pay, and within one working day we email your test plan: the page, the ad channel and the pass mark.
Questions
Good to know
Is €100 of ads enough to learn anything?
Usually, yes. €100 brings roughly 100 to 400 targeted visitors, depending on the market and the channel. That is enough to see a clear yes or a clear no. If your market is costly to advertise in, such as law or finance, we tell you before we start.
Which ad channels do you use?
The one your buyers already use. Google Search when people look for a solution, Meta (Facebook and Instagram) or TikTok for things people buy on impulse, and Reddit for niche and tech audiences. We agree it with you in the test plan.
What counts as a “go”?
We agree a pass mark before the ads start, for example “8% of visitors join the waitlist” or “five pre-orders”. Then the numbers decide, not our opinion or yours.
Is it honest to the people who see the ads?
Yes. The page says the product is coming and asks people to join a waitlist or sign up for early access. Nobody pays for something that doesn’t exist. If you want pre-orders, they are refundable, and the page says so.
Will you keep my idea private?
Yes. We use it only for your test. We don’t build it, share it or sell it. The page runs under a name you approve.
What if the answer is no?
Then the sprint did its job and saved you months. The report shows where people dropped off, and often a better angle or price to test next.
What do you need from me?
About 30 minutes in all: the 6 questions, a yes on the page on day 1, and the results call.
Who owns the page and the results?
You do: the page, the sign-up list and the data. People who sign up hear from you, as the page promised them, and from no one else.
Can you build it if the answer is go?
Yes. Nexodyne Studio, our build team, makes sites and apps for a fixed price and takes your sprint fee off it.
How do I pay, and can I get a refund?
By card, Apple Pay or Google Pay through Stripe, in full when you book. You get a full refund until you approve the page. After that, if you stop, we refund the part of the ad budget not yet spent. The details are in our terms.
Know before you build.
€249, ads included, results in 7 days.