Nathan Fallet

Kotlin engineer. I build businesses on my own open source.

I have been writing code since I was 10. Today I run Guimauve Digital, an app studio, and I build the products it sells on libraries I write and release in the open.

See what I ship Browse the libraries

Open source projects

23,750

Stars on what I maintain

Videos & podcasts

Years writing code

Products

What the open source pays for

What I ship, and the libraries it runs on.

ControlResell

Guimauve Digital

Sell more, in less time. The reselling automation platform that saves sellers 20+ hours a week.

kdriver kourier zodable pkg flareon webhooks stripe-to-amplitude

Open source

Libraries I maintain

Written for a product that needed them, then released. Star counts come straight from the GitHub API.

kdriver

★ 107

Blazing fast, coroutine-first, undetectable browser automation for Kotlin.

Powers ControlResell Kotlin

OCaml: Learn & Code

★ 86

An OCaml editor, top level and learning place for iOS, iPadOS and macOS.

Swift

kourier

★ 44

Pure Kotlin AMQP 0.9.1 client for RabbitMQ. Coroutines, multiplatform, auto-reconnection, no Java client.

Powers ControlResell Kotlin

zodable

★ 29

Generate zod schemas from Kotlin data classes.

Powers ControlResell Kotlin

ant-design-kmp

★ 25

Ant Design components for Compose Multiplatform.

Kotlin

amplitude-kmp

★ 19

The official Kotlin Multiplatform SDK for Amplitude Analytics.

Kotlin

shortt

★ 9

A URL shortener built with clean architecture in mind.

Kotlin

streamdeck-kotlin-sdk

★ 8

A Kotlin SDK to create Stream Deck plugins.

Kotlin

cloudflare-api-client

★ 6

Kotlin client for the Cloudflare API.

Kotlin

kotlinds

★ 3

Kotlin Multiplatform utilities to work with Nintendo DS ROM files.

Kotlin

pkg

★ 2

An open source Maven, npm and PyPI package manager.

Powers ControlResell Kotlin

webhooks

★ 2

Kotlin clients to push events to Discord, Slack and friends.

Powers ControlResell Kotlin

generate-sitemap

★ 2

A GitHub Action to generate a sitemap for GitHub Pages websites.

Shell

experiment-kmp

★ 1

Kotlin Multiplatform SDK for Amplitude Experiment.

Kotlin

customerio-api-client

★ 1

Kotlin client for the Customer.io server API.

Kotlin

flareon

★ 1

A Firebase Admin SDK for Kotlin Multiplatform.

Powers ControlResell Kotlin

stripe-to-amplitude

★ 1

Load all your Stripe data, past and live, into Amplitude with a consistent event format.

Powers ControlResell TypeScript

No longer maintained

APIRequest

★ 15

A Swift package and Android library to talk to a REST API.

Powers Delta: Algorithms Powers Ringify Swift

makth

★ 9

A Kotlin library for algebra.

Powers FlashUp Powers Delta: Algorithms Kotlin

UnlockPremium

★ 8

A ready-made "unlock premium" screen for iOS and Android apps.

Powers Delta: Algorithms Powers BaseConverter: Converty Kotlin

Keychain.swift

★ 7

The easiest way to store data securely in the keychain, with a UserDefaults-like API.

Swift

kaccelero

★ 7

An all-in-one toolkit for mobile and web development in Kotlin and Swift.

Powers FlashUp Powers iAPush Powers Extopy Powers BaseConverter: Converty Powers Ringify Powers Suite BDE Kotlin

DonateViewController

★ 5

A view controller to collect donations inside an iOS app.

Powers Tic TAI Toe Swift

GuimauveUI

★ 2

Reusable UI components for Compose and SwiftUI.

Powers FlashUp Powers iAPush Powers BaseConverter: Converty Powers Ringify Powers Suite BDE Kotlin

FMNetwork

★ 2

The FMobile developer pack: read the mobile network state from Swift.

Powers FMobile Swift

DigiAnalytics

Realtime web analytics with privacy and simplicity at its core.

Swift

Something here you could use? It is all open source: take it, open an issue, send a pull request.

Follow on GitHub

Contributions

Other people's projects I have shipped code to

Kotlin, Swift, and the tools I use every day. A few of them I help maintain.

cube-js/cube 📊 Cube Core is open-source semantic layer for AI, BI and embedded analytics Powers ControlResell ★ 20,504 ktorio/ktor Framework for quickly creating connected applications in Kotlin with minimal effort Powers ControlResell Powers FlashUp Powers iAPush Powers Extopy Powers Ringify Powers Suite BDE ★ 14,493 krzyzanowskim/CryptoSwift Maintainer CryptoSwift is a growing collection of standard and secure cryptographic algorithms implemented in Swift ★ 10,559 stephencelis/SQLite.swift Maintainer A type-safe, Swift-language layer over SQLite3. Powers Delta: Algorithms Powers BaseConverter: Converty ★ 10,187 rabbitmq/rabbitmq-tutorials Tutorials for using RabbitMQ in various ways ★ 6,891 firebase/firebase-ios-sdk Firebase SDK for Apple App Development ★ 6,648 JetBrains/koog Koog is a JVM (Java and Kotlin) framework for building predictable, fault-tolerant and enterprise-ready AI agents across all platforms – from backend services to Android and iOS, JVM, and even in-browser environments. Koog is based on our AI products expertise and provides proven solutions for complex LLM and AI problems Powers ControlResell ★ 4,477 flutter/website Flutter documentation web site ★ 3,104 oshai/kotlin-logging Lightweight Multiplatform logging framework for Kotlin. A convenient and performant logging facade. ★ 3,095 cdpdriver/zendriver Maintainer A blazing fast, async-first, undetectable webscraping/web automation framework based on ultrafunkamsterdam/nodriver. Now with Docker support! ★ 1,375 twostraws/CodeScanner Maintainer A SwiftUI view that is able to scan barcodes, QR codes, and more, and send back what was found. ★ 1,220 rabbitmq/rabbitmq-website RabbitMQ website ★ 1,214 translate/translate Useful localization tools with Python API for building localization & translation systems ★ 963 twostraws/Sourceful A syntax highlighting source editor for iOS and macOS using UITextView and NSTextView. ★ 714 pret/pokeheartgold Decompilation of Pokemon HeartGold/SoulSilver ★ 559 ktorio/ktor-documentation Documentation for the Ktor framework. ★ 537 ocaml/v2.ocaml.org Implementation of the ocaml.org website. ★ 320 fabrikt-io/fabrikt Generates Kotlin Code from OpenAPI 3 Specifications ★ 281 vapor-community/Lingo-Vapor Vapor provider for Lingo - the Swift localization library ★ 59 vapor-community/google-cloud-kit A Swift toolkit for the Google Cloud Platform APIs. ★ 57 funcmike/rabbitmq-nio A Swift implementation of AMQP 0.9.1 protocol: decoder + encoder and non-blocking client ★ 49 DamirDenis-Tudor/ktor-server-rabbitmq Official RabbitMQ plugin for Ktor framework. ★ 35 CovidTrackerFr/vitemadose-ios Application iOS de l'outil ViteMaDose ★ 33 vapor-community/vapor-sitemap Maintainer A dynamic sitemap generator for Vapor. ★ 8

Videos

What I talk about

Architecture, Kotlin Multiplatform, and the business side of shipping mobile apps. Most of them are in French.

CONSEILS pour améliorer son PAYWALL dans une app mobile 2024-06-19 · iAPush

Je comprends RIEN à TikTok ! 2024-06-04 · Ringify

Explose les téléchargements de ton app mobile ! (ASO + astuces) 2024-06-01

Ma CLEAN ARCHITECTURE projet KMM + KTOR 2024-05-27 · Extopy

La #KotlinConf2024 vue par un dev mobile indépendant 2024-05-23

Kotlin Multiplatform Mobile : C'est quoi ? 2023-07-12

LIVE - On développe un JEU DS #1 2023-05-27 · PickFalling

APIRequest.swift: Fetch data from a REST API in your iOS app 2020-05-09 · APIRequest

LIVE CODE - Tic TAI Toe for Android? Let's create it! (Part 1) 2019-04-12 · Tic TAI Toe

LIVE CODE - Create a tic tac toe game with an AI in Swift 2019-04-08 · Tic TAI Toe

TPE - L'intelligence artificielle : une IA imbattable au Morpion 2019-01-09 · Tic TAI Toe

Writing

Things I wrote down

Posts on Medium and dev.to, mostly about the Kotlin decisions behind the libraries above.

Ktor Native Worker Tutorial 6 parts kourier dev.to · 2025-12-21 Stop wrapping your RabbitMQ code in runBlocking kourier dev.to · 2025-12-01 Why We Don't Need Libraries in Kotlin Multiplatform Medium · 2025-11-06 From Python to Kotlin: Why We Rewrote Our Scraping Framework in Kotlin kdriver zodable Medium · 2025-09-22 I changed the way I study FlashUp Medium · 2022-07-01

Elsewhere

Guest appearances

Podcasts, interviews and articles on other people's channels.

Il a QUITTÉ le freelance pour lancer son SaaS 2026-06-21 · with Nicolas Diot · ControlResell

ControlResell automatise la vente en ligne : React Native ou Kotlin Multiplatform ? 2025-05-22 · with David Leuliette (Cross Platform Show) · ControlResell

Ils veulent passer de 400 à 10 000€/mois avec leurs apps mobiles 2025-04-09 · with Les Ignobles (On t'parle app !) · FlashUp · ControlResell

Chit-chat with Nathan Fallet, the manager of code.community 2019-04-12 · Creative Tim

Where I come from

Minecraft plugins at 14, apps with friends, a vaccination slot finder during a pandemic. Not maintained, kept for the record.

FlashUp 2022 iAPush 2025 Delta: Algorithms 2024 Vite Ma Dose 2022 Extopy 2025 FMobile 2023 Tic TAI Toe 2022 BaseConverter: Converty 2024 Ringify 2024 Suite BDE 2024 code.community 2020 CraftSearch 2020 Replica 2023 ZabriPermission 2018 PlugNCraft 2022 PickFalling 2023