SLOWR
A men’s wellness app with step-by-step training programs, progress tracking and a monthly subscription, all in one place.
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Your own creator app. Built in 21 days.
Think your own app costs $50,000?
We build yours for $5,000. Fixed.
One new project a month.
Apps shipped by Cortexity: SLOWR, ReflexFlow.
Millions of views. Your income still waits for the next brand deal.
You post every day, but the algorithm decides who sees it, and brand deals come and go.
Your most loyal followers would pay for more of your content, but there’s nowhere for them to pay you.
You thought about making your own app, but it seemed like too much money and too much time, so you keep giving everything away for free.
We build a subscription app around your content.
Your followers pay you every month to get in.
We build it for you in 21 days, for a fixed $5,000.
Apply to Build Your AppI personally review every application.
Here’s what a membership app built in 21 days looks like.
Day 1
“What if my most loyal followers paid me monthly for exclusive content, in my own app?”
That’s enough to start.
No specification. No technical knowledge.
We take it from there.
21 days later
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Your own membership app, live on the App Store.
Your content, behind your own paywall.
Followers who pay you every month.
Income that doesn’t wait for a brand deal.
Apply to Build Your AppI personally review every application.
The Founder
One person responsible for getting it done.
You work directly with me, from the first call to the App Store.
Hi, I’m Joseph, founder of Cortexity. I design and build mobile apps for creators, from the first call to the App Store.
Before building apps for others, I built my own. I’ve been the client myself and felt the delays, the vague answers and the “that wasn’t in the scope”. That’s why Cortexity exists.
When I take on your app, I take responsibility for getting it built. You shouldn’t have to project-manage your developer or understand the technology. You should feel free to change your mind when the product could be better.
For 21 days we work on one goal: the best first version of your app we can build.
And yes, I’m the one who answers your messages.
What’s Included
Everything between the idea and the App Store.
Product, design, development and launch, handled by one person.
Product
We turn what’s in your head into a first version worth building.
Design
Every screen and every interaction, designed so you’re proud to put your name on it.
Development
App, backend, database, APIs. You never need to know what any of it means.
Refinement
You see it as it’s built. Change your mind as often as you like. No hourly bill.
Launch
We submit it to the App Store and stay with you through review.
Built by Cortexity.
A few of the apps we’ve built, live on the App Store today.
ReflexFlow
A wellness app for women: a multi-week program they follow from their phone, with guided audio sessions and progress tracking.
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The Process
What the next 21 days look like.
- 1
Week 1
We understand the idea.
- We talk through the idea, who it’s for and how you imagine it working, then start designing.
- We define the main features for version one.
- First screens on your phone by the end of the week.
- 2
Week 2
The app starts working.
- The core of the app works on your phone.
- You use it every day and tell me what feels wrong.
- We change it. Nothing extra to pay.
- 3
Week 3
We polish it and submit it to the App Store.
- Refinement and polish, together.
- App Store submission, handled with you.
- The app, the design, the code: yours.
No Scope Creep
No “that’s outside the scope” every time you have an idea.
Changing your mind is part of building something good.
A product you imagined three weeks ago won’t always be the product you want after you’ve actually seen and used it.
For the 21 days we’re working together, you’re not going to be charged every time you ask us to change a button, rethink a screen or improve how something works.
Ask for changes as often as you like.
There is no awkward conversation because you’ve used your allotted number of revisions.
If you ask for a big change that needs more time, we’ll adjust the timeline together.
But our default response to a better idea isn’t:
“That’s outside the scope.”
It’s:
“Let’s figure out how to make it work.”
Who It’s For
This is for creators who want to get paid by their followers, not just by brands.
Cortexity is for you if your followers already ask for more, and you want hundreds of them paying you every month.
You don’t need to be technical.
You don’t need to have founded a company before.
You don’t even need to have every detail figured out.
But you do need to show up.
We want creators who answer messages, give feedback, make decisions and genuinely want to see their product exist.
In return, you’ll get that same commitment from me.
We deliberately take on very few projects because when we’re building yours, we want to be all in.
If you’re casually exploring an idea, looking for the cheapest possible developer, or collecting ten quotes before deciding whether you even want to build anything, we’re probably not the right fit.
If you’re thinking:
“I want to finally build this properly.”
Then we should talk.
Tell Us What You Want to BuildI personally review every application.
Pricing
$5,000. Start to finish.
One fixed price, paid in two halves.
No hourly rate, no separate designer, and no bill that grows every time you ask for a change.
Your Cortexity build: $5,000
$2,500 to start.
$2,500 when your app is finished.
iPhone
$5,000
- Product strategy
- Full app design
- Development
- Backend, database & APIs
- Testing
- Refinement throughout the build
- App Store submission
- Full ownership of the app and code
Apply to Build Your AppNo payment until we’ve spoken and both said yes.
iPhone + Android
$8,000
- Product strategy
- Full app design
- Development
- Backend, database & APIs
- Testing
- Refinement throughout the build
- App Store submission
- Full ownership of the app and code
- Android built as a second phase
Apply to Build Your AppNo payment until we’ve spoken and both said yes.
Before you pay anything, I’ll talk with you about your idea.
I’ll make sure I understand what you want to build and that Cortexity is the right studio for it. If it isn’t, I’ll tell you.
FAQ
Questions you probably have.
Straight answers to what creators ask first.
Do I need a huge following?
No. A few hundred loyal followers paying monthly is already real income.
We’ll go through your numbers on the first call, before you pay anything.
Can you really build my app in 21 days?
Yes. Before we start, we agree exactly what the first version includes, so 21 days is enough.
What if I change my mind about something halfway through?
That’s expected. Changing your mind is part of the process.
During the 21 days, we’ll keep refining the product with you. You’re not going to receive an extra invoice because you wanted a screen redesigned or realized something should work differently.
If you make a major change that affects the 21-day timeline, I’ll tell you right away and we’ll adjust the delivery date together.
What happens after the 21 days?
Once the build is complete, the app is yours.
We’ll then handle the App Store submission process with you.
Want to keep building after that? New features and bigger updates are a new project, priced on its own.
You’re not locked into Cortexity.
What if something breaks after the project?
If something we delivered isn’t working the way it’s supposed to, we’ll fix it.
We’re not going to hand you the app on Day 21 and pretend we’ve never met.
For new features, redesigns or continued product development after the initial project, we simply start a new project together, billed separately.
Can you build Android too?
Yes. iPhone is $5,000. iPhone plus Android is $8,000.
We build the iPhone app first, then the Android version, so each one feels native.
Tell us in your application if you want both.
Is App Store submission included?
Yes.
We handle the submission process after the 21-day build.
Apple controls the review and approval process, so the time Apple takes to approve an app isn’t counted as part of the 21 days.
If Apple comes back with something that needs addressing, we’ll work through it until the app is live.
Do I own everything?
Yes.
Once the project is completed and the final payment is made, the finished app, code and project are yours.
It’s your product.
How is payment made?
By bank transfer or a secure Stripe payment link.
In Lebanon, you can also pay via Whish.
The project starts once the 50% deposit is received.
Do I need to know anything about building apps?
No.
You know the idea, the customer and the problem you’re trying to solve.
We take care of the rest.
Three weeks from now, your followers could be paying you every month.
Imagine waking up to hundreds of new members paying you every month.
If you have an app idea you’re serious about, tell us about it.
I’ll personally review what you send.
At the end of the application, you book a call with me to talk it through.
Built in 21 days, for a fixed $5,000.
Apply to Build Your AppI personally review every application.
One new project a month.