pablin.me

Games & apps · Quito

Every shape is real.

pablin.me is a one-person studio making games and apps for Apple devices, one at a time.

New Hola PDF: paper in, clean PDF out →

Apps

iPad · iPadOS 27 · Coming to the App Store

Converger

Move the maths, then check it. Interactive maths and physics for iPad: Geometry, AP Calculus, AP Physics 1 and Linear Algebra. Drag a point, slide a parameter, predict what happens, then check your answer. Geometry is free in full; Converger Pro is one purchase for every subject. iPhone, iPad & Mac · iOS 26 · Free on the App Store

Hola PDF

Paper in, clean PDF out. Scan a page straight and clean, search the text of everything you have scanned, then mark documents up, sign them and lock them with a password. Hola PDF Pro is one purchase, no subscription. iPhone, iPad & Apple Watch · iOS 18 · Free on the App Store

Hindcast

How sure is the forecast? A weather app that says how sure it is: one plain sentence, the temperature and three tally marks, with the reason one tap deeper. Forecasts from Apple Weather. iPhone & iPad · iOS 26 · Free on the App Store

Tally

Every number stays yours. Expenses, subscriptions, debt, and goals — tracked and narrated entirely on your device. iPhone & iPad · iOS 26 · Free on the App Store in Ecuador

Mullu

Qué paga cada banco por tu dinero. What Ecuador's banks and cooperativas pay on your savings, ranked from most to least. Every rate is read by hand from the institution's own rate sheet, dated, and linked to the document. In Spanish. iPhone & iPad · iOS 27 · Free on the App Store

Sharp

Many shots. One picture. Five tools for photographs shot more than once: stack the focus, average the noise away, clear the crowd out of a square, build star trails, or keep the sharpest frame of a burst. iPhone & iPad · iOS 26 · Free on the App Store

Replay Breakdown

Shoot it. Step through every frame. Frame-by-frame video for coaches: step through every frame of the clip you just shot, measure angles, heights and speeds, compare two attempts, talk it through, and send it back slowed down. Mac · macOS 15 · Free on the Mac App Store

Chinagraph

Everything around the edit. Everything around the edit, on the Mac: copy a card to two drives and check every file, cull RAWs at the speed of the keys, merge focus brackets and night skies, then geotag, caption and export. iPhone & iPad · iOS 17 · Free on the App Store

Rake Plus

Change the photo after the shot. Light, air and focus, after the shot. Rake Plus reads how far away everything in a photo is, then clears haze, relights with real shadows, adds fog and shafts of light, and moves the focus.

Mathematics and physics, on the web

ConvergerLab

Twenty courses in the browser, from geometry and calculus to complex analysis. Every lesson has a lab beside it: drag a point, slide a parameter, predict what happens, then check. Answers are graded as mathematics, and practice comes back when it is due.

convergerlab.com The courses
The ConvergerLab home page: a calculus preview where dragging an orange number moves a secant line toward the tangent of x squared
Calculus preview · drag the secant

A weekly series

Ray Kiln

One new Metal shader every week. A short video builds it from nothing; a page has the full source, every parameter explained, and the sound it makes, which the shader generates too. Open source.

raykiln.dev YouTube GitHub
Flowing Color Field, the first Ray Kiln shader: a field of orange and black noise folded over itself
Shader 01 · Flowing Color Field

What we won't trade away

Practice

Four commitments every project here is built on — decided before a single feature, not adjusted for one.

Prop. I

Privacy by default

Where an app uses AI, it runs on-device through Apple's own Foundation Models, next to the data it reads.

Prop. II

Build the real thing

We draw interfaces from actual shapes and native components, not pictures of them. If it's on screen, it's the same geometry the code collides against.

Prop. III

Own the whole stack

We write Swift, SwiftUI, and Apple's own frameworks end to end. No cross-platform runtime stands between an app and the OS it ships on.

Prop. IV

Earn every dependency

We treat a third-party package as a liability until it proves otherwise — one more thing a user trusts with their data without ever agreeing to it.

Series

Longer technical write-ups, grouped by topic.

Shot More Than Once

How Sharp 1.2 was built and measured: the first runs on a real iPad, rotation in the aligner, choosing the detail size by eye, exposure blending, stacking in slabs, and retouches that can be reopened.

1 posts · Swift

Keeping Time

How Tick Again runs a mechanical watch: the gear train, the escapement stepping beat by beat, the three sounds in every tick, the timegrapher, winding, the order a movement comes apart, and faults as physics.

7 posts · Swift

Depth & Light

How relighting a photograph works: the depth a Portrait photo carries, turning it into surfaces, and lighting them with three lights that cast real shadows.

7 posts · Photography & rendering

Finance Core

The calculation engine behind Tally: running balances, savings rate, runway, recurring projections, debt payoff, and goal pacing.

7 posts · Swift

Multithreading

Five small C# programs from 2019 on making threads work together: signals, a parallel search, matrix products, a producer and its consumers, and prioritised groups.

5 posts · C#

Parallel Computing

OpenCL and OpenMP from a first kernel to an LU decomposition, then the same decomposition with SSE intrinsics, each version timed.

7 posts · OpenCL · OpenMP

Simulation & Statistics

Twelve C# and Windows Forms programs from 2020: random events, Poisson and Wiener processes, Markov chains, the chi-square test and a bank simulated event by event.

12 posts · C#

The person behind it

Hello, I'm Pablo.

A software engineer based in Quito, Ecuador, working mostly in Swift and C#. pablin.me is where that work ships. Outside of it: books, music, and more podcasts than is reasonable.

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