Delafu Development EST. 2026

Delafu Development

Studio blueprint · an iPhone app studio · Ciudad de México

DWG. DD-000Rev B

Software that doesn't want anything from you.

I build iPhone apps and sell them. That's the whole business: no ads, no selling your data, nothing that punishes you for missing a day. You pick one up, it does its job, and you keep what you made.

Where this comes from

I'm David de la Fuente, a mechatronics engineer. More than ten years in automotive systems, and I'm still there. This studio isn't a career change. It's what I do after hours.

My day job is functional safety, on the systems that brake a car. The work is designing so the failure that would hurt someone never gets the chance to happen.

Detail A — a braking function this critical may fail dangerously fewer than ten times in a billion hours of driving. Nobody ever notices it working. It still has to be right, every single drive.From the day jobPrimaryMonitorCompare≤ 10 FIT

ten failures in a billion hoursand nobody ever sees it work

Detail A — a braking function this critical may fail dangerously fewer than ten times in a billion hours of driving. Nobody ever notices it working. It still has to be right, every single drive.

That standard came with me.

I didn't want to build more machinery. I wanted things that feel human: warm, unhurried, not tugging at you every few minutes. The work you actually did today. Your grandmother telling the story about the house, in her own voice.

Almost nothing I use is built that way anymore. That's a big part of why I started.

You decide loopFig. 0 — the studio loop. The variable being controlled is your attention, and the setpoint is as little of it as the job needs. Most software controls for the opposite: it treats your time in the app as the thing to maximise, which is why it learns to nag.You decideIt does its jobYou put it downYou keep itnot a feed, not a nudgeone thing, properlynothing holds you therethe work done, a voice keptyou come back because it was worth it, not because it naggedSetpoint · a day that was yoursOutputYou decide loopFig. 0 — the studio loop. The variable being controlled is your attention, and the setpoint is as little of it as the job needs. Most software controls for the opposite: it treats your time in the app as the thing to maximise, which is why it learns to nag.You decideIt does its jobYou put it downYou keep itnot a feed, not a nudgeone thing, properlynothing holds you therethe work done, a voice keptyou come back because it was worth it, not because it naggedSetpoint · a day that was yoursOutput
Fig. 0 — the studio loop. The variable being controlled is your attention, and the setpoint is as little of it as the job needs. Most software controls for the opposite: it treats your time in the app as the thing to maximise, which is why it learns to nag.

Chamba

In development

PathMarkfour runs, four lanes

ForAdults with ADHD who have already given up on static to-do lists

A to-do app for ADHD that asks how you're doing first, then uses that to decide what makes sense to work on.

A to-do list assumes you are the same person every day. You are not.

The problem

So every list hands you the same twelve tasks whether you slept well or not, whether you have the energy or not. Slowly, it becomes a monument to everything you didn't do.

The solution

The same backlog gives you genuinely different suggestions depending on how you're doing that day. It matches tasks to the state you're in, not to a filter you set once and forgot.

One email, the day Chamba is on the App Store. Nothing before it, nothing after it, and you can leave any time. What happens to your address.

The full sheet: how it works, what's free, what Pro adds →

DWG. DD-CHM-001Rev BSheet 01 of 02

Relato

In development
Relato's mark: two hands rising into a trunk made of a voice waveform, under a canopy of leaves

The treea voice, held, growing

ForFamilies who want to keep their stories in the voices of the people who tell them

An app that asks one question a week to preserve your family's stories in the voices of the people who lived them.

One question a week. Fifty-two stories a year, in their voice.

The problem

Your family's stories live with people who will not always be here. And nobody sits down on a Sunday to record forty years of memories. So it never happens, and one day it no longer can.

The solution

You hand them the phone and they talk. Relato keeps their voice as they told it; the transcript is there only to accompany it.

One email, the day Relato is on the App Store. Nothing before it, nothing after it, and you can leave any time. What happens to your address.

The full sheet: how it works, what's free, what Pro adds →

DWG. DD-RLT-003Rev BSheet 02 of 02

Message me

Title block

No contact form, no chatbot, no ticket queue. It arrives at me.

I don't take client work. This is a studio for my own apps, so write about those, or about anything else you like.

Send me an email

Or write to david@delafu.dev
Anything sent from here arrives tagged, so it doesn't get lost among app bug reports.

DrawingDelafu Development — Studio Blueprint
RevisionB · 2026-08-11
Drawn byDavid de la Fuente
LocationCiudad de México
Emaildavid@delafu.dev
Codedaviddelafuente