Kharonte 
Full-stack web platforms
Responsive, accessible front ends, crafted for detail and speed, connected to a backend designed to grow with the product.
Kharonte Studio · @kharonteAppDev
Design, code, store. All by myself. Five real products for work, sport and wellbeing. I won't ask you to take my word for it: down below, they actually work.
Charon · tap an app
Don't read. Try.iOS & Android
The test bench.
Every app is here in miniature, and it works for real: it calculates, generates, breathes. Everything runs in your browser, no data leaves this page.
Preventivi Facili
Quotes and invoices as PDF straight from your phone, 100% offline. How long does it take you to make one?
0,0seconds · starts at your first keystroke
Items
The PDF is created on your device, no server involved.
QUOTE NO. 104
| Description | Qty | Amount |
|---|
Subtotal
VAT 22%
Total
In the app: client archive, signature, logo, invoices. Here, just a taste.
Full details →
Full details →
Foodlio
Real food cost, margins and menu engineering for chefs, bars and restaurants. Move the prices and see what happens.
Pick a dish
0%
margin
margin
–Food cost
–Profit / dish
–Price at 30%
In the app: recipes, suppliers, spec sheets, menu engineering.
Full details →
Full details →
Padel Match Manager
Americano without paper sheets or a calculator. Pick the players: each pair plays together only once.
Players
In the app: Mexicano, group stages, live standings, sharing.
Full details →
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Aegis
Guided breathing, sounds and a private journal. Follow the lotus: the whole scene breathes with you.
·Ready
Cycles completed: 0
In the app: sounds, journal, stats. No ads.
Full details →
Full details →
FlipEven
Before you buy, find out the price you need to resell at. No more selling at a loss.
Example percentages: in the app you set the real ones for each platform.
Net profit
–
PurchaseShippingFeeProfit
–ROI
–Break-even
–Margin
In the app: inventory, sales history, catalogs.
Full details →
Full details →Who's behind it
A designer, a developer and whoever manages the app stores. They are the same person. That is why every app is small, fast, private and finished down to the last pixel.
This is how they look on your phone.
Real screenshots, not mockups. Drag to scroll and tap to open the page.
FlipEven · ResellingKnow what
you really earn
you really earn
Three jobs, one person.
Pick a hat and look at the same product from three sides: how I design it, how I write it, how I bring it to the stores.
Foodlio demo logic, simplified
// The calculation you just saw
double margin(double cost, double price) {
final net = price / 1.10; // 10% VAT
return (net - cost) / net * 100;
}
if (cost / net > 0.30) {
warn('You are giving away margin');
}margin(4.20, 16.00)71,1%
Offline-firstData on deviceiOSNo ads
Not just apps: web, backend and AI.
The same hands that ship these five apps also build web platforms, backend services and artificial intelligence integrations for others.
Secure APIs and databases
Robust backends, secure APIs, efficient database management and architectures that hold up as the product grows.
Practical artificial intelligence
Language models, computer vision and semantic processing woven into real workflows, in the cloud or on the device, where they bring a concrete benefit.
Frequently asked questions.
Short answers to what people ask me most.
Who is behind Kharonte Studio?
Kharonte Studio is an independent one-person studio (@kharonteAppDev): I design, build and publish every app, from the interface to the stores.
Which platforms are the apps available on?
Preventivi Facili, Foodlio, Padel Match Manager and Aegis are on the App Store and Google Play. FlipEven is on the App Store; the Android version is coming soon.
Do the apps work offline and respect privacy?
They are designed to keep your content on your device and to work offline too: Preventivi Facili stores quotes and clients only on the phone, Padel Match Manager runs tournaments offline, and Aegis has no ads. Some apps collect limited, pseudonymous usage events and diagnostics (for example about purchases or crashes): details are in each app's privacy policy. This site uses no cookies or trackers.
Are the apps free?
The published apps can be downloaded for free. Preventivi Facili offers a one-time lifetime purchase with no recurring fees; Aegis offers monthly and annual subscriptions; for Foodlio and Padel Match Manager the Pro options are shown in the app. Current prices and terms are always listed in the stores.
Do you also build custom software?
Yes. Besides the studio's own apps, I design and build native iOS and Android apps, full-stack web platforms and AI integrations. Write to me at kharonte.appdev@gmail.com with a short description of your project.