What the free fit check gives you
This is what comes back. Read three before you write yours.
A fit check is one sentence from you and a straight answer from us: whether it fits ten working days, what we would cut if it does not fit as written, and the first cut of your product into screens. Free, by email, within one working day.
Free 1-minute fit check · no equity · no retainer
About these three
The three ideas below are invented, and so are the people. What somebody sends us is theirs, and it stays that way even with the names taken out. The length, the vagueness and the answers are exactly what the real ones look like — including the third one, which is the most common of all.
Example 01
An idea that fits as it is
What they sent
- From
- Dana R.
- Building
- Internal tool
- Stage
- Existing business
“I run a dog grooming salon with four groomers. Clients book by WhatsApp and I write it in a paper diary, so we double-book and people forget appointments. I want them to book online and get a reminder the day before.”
What we sent back
Fits ten working daysThis is one workflow with a clear edge: a client picks a slot, the slot stops being available, and a reminder goes out the day before. Everything else in a salon — stock, payroll, loyalty points — sits outside that sentence, so it sits outside version one.
What we would watch: four groomers means four separate calendars, not one. Getting that wrong is what makes booking tools useless on day two, so it is in version one rather than after it.
The first cut, six screens:
| Screen | Who opens it, and what they do there |
|---|---|
| Book a slot | Client, no login. Picks service, groomer and time from real availability. |
| Booking confirmed | Client. Add to calendar, and the link that cancels or moves it. |
| Today | Groomer. Their own day, in order, with the dog and the owner's note. |
| Week view | Owner. All four groomers side by side. Drag to move an appointment. |
| Clients and dogs | Owner. History per dog: breed, coat notes, last visit, no-shows. |
| Hours and services | Owner. Opening times, holidays, prices and how long each service takes. |
Reminders go by email the day before and an hour before, with WhatsApp as a later sprint — it needs a business account and an approval that is outside our ten days, and we would rather say that now than discover it on day eight.
Example 02
An idea that fits once one side is cut
What they sent
- From
- Marcus O.
- Building
- Marketplace
- Stage
- Validated idea
“A marketplace where care homes post open nursing shifts and agency nurses bid on them. Nurses upload their licence and DBS check, homes pick one, we take 8% and pay the nurse weekly. Nurses need an app, homes need a dashboard.”
What we sent back
Fits with one side cutEverything here is buildable. All of it at once is not ten working days, and the part that overruns is not the part that looks hard: it is weekly payouts to individual nurses, which means identity checks, bank details and a money licence question we cannot answer for you.
What ships in ten days: the homes' side and the nurses' side of filling the shift. Post a shift, nurses see it, nurses apply, the home picks one, both get a confirmation, the licence and DBS documents are attached to the nurse and visible to the home before they pick.
What waits: money. For version one the home pays the nurse the way it already does, and the 8% is an invoice you send monthly from the export. That keeps a real marketplace live in ten days instead of a payments integration in twelve weeks, and you find out whether homes post shifts before you pay for any of it.
The first cut, seven screens:
| Screen | Who opens it, and what they do there |
|---|---|
| Post a shift | Home. Date, ward, hours, rate, what qualification it needs. |
| Open shifts | Nurse. Filtered by distance and date. Apply in one tap. |
| Applicants | Home. Who applied, their documents, their expiry dates. Pick one. |
| My shifts | Nurse. Confirmed and applied-for, with the address and who to ask for. |
| My documents | Nurse. Upload licence and DBS, see what expires and when. |
| Shift board | Home. This week: filled, open, and open-and-starting-soon in red. |
| Monthly export | You. Every filled shift with its rate, for the invoices you already send. |
Bidding is in the list above as applying, not as an auction. An auction needs enough nurses on day one for the price to move, and on day one there are none — so it would make the product look broken at exactly the moment you are showing it to the first care home.
Example 03
An idea with not quite enough to judge yet
What they sent
- From
- Priya S.
- Building
- SaaS / Web App
- Stage
- Idea
“An app for my gym.”
What we sent back
Two questions and you get the real answerWe will not pretend we understood this one. An app for a gym is six different products depending on what it has to do, and they are not the same size: a class booking app ships in ten days with room to spare, a workout tracker with a programme builder is tight but doable, and a gym that also runs memberships, door access and personal-trainer payouts is three sprints, not one.
So two questions, and one line each is plenty:
- When a member opens it, what is the first thing they are trying to do — book something, log something, or pay something?
- Who else logs in: just you, or trainers and front desk too?
Answer those by replying to the email and the real fit check comes back within one working day, with the screens. Nothing to pay in between.
This is the most common fit check we send, and it is nobody's fault — the form asks for one line and one line is what people give. It is also why the box now says what it says: the answer you get back is only as good as the sentence it is based on.
How much to write
One sentence that says what it does.
Not what it is. What it does the moment somebody opens it. That one sentence is what the whole fit check is built on, and it is the difference between example one and example three.
Enough to judge
- “Drivers open it, see today's route in order, and mark each delivery done or failed with a photo.”
- “Clients log in and see every invoice and document we have ever sent them, so they stop emailing me for copies.”
- “Our three coaches each get a list of the athletes assigned to them and write a weekly note the athlete can read.”
Comes back as questions
- “A CRM but better.”
- “Uber for X.”
- “An internal tool for the team.”
- “An AI agent for my business.”
These still get an answer, and nothing is lost by sending one. It is just a slower road to the same place: we reply with the two questions, you answer them, and then you get the screens.
Your idea stays yours
We do not publish it, share it, or build it for anyone else.
The three above are invented for this page precisely because the real ones are not ours to show. If you want that in writing before you send a word, ask for an NDA in the form and we sign one the same day — it costs you nothing and it does not slow anything down.
What happens after you send it
- Straight away. A confirmation email with what we understood, in your words, so you can correct us immediately if we have it wrong.
- Within one working day. The fit check itself: the verdict, what we would cut, and your first screens.
- Then nothing, unless you reply. No newsletter, no sales sequence, no call to book.
Questions
Before you write yours.
What do I get back from a fit check?
A straight answer on whether your idea fits ten working days, what we would cut if it does not fit as written, and a first cut of your product into screens. By email, within one working day. Free, with nothing to pay afterwards unless you want the blueprint.
How much do I have to write?
One full sentence that says what the thing does when somebody opens it. That is enough to judge it. Two or three sentences gets you a sharper answer and the first screens.
Who reads it?
A person. Every fit check is read and written by the engineers who would do the build, not by a sales team passing it on.
Is my idea safe?
We do not publish, share or reuse what you send. These examples are invented for this page. If you want it in writing before you send anything, ask for an NDA and we sign one.
Next step
Find out if your idea fits in 10 working days.
Tell us what you want to build. We reply the same day with a straight yes, no, or here is what we would cut.