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Andrey Sitnik

Author of PostCSS and Autoprefixer, Principal Frontend Engineer

mastodon.social/@sitnik_en

Products

PostCSS
PostCSS
One of the most popular and most depended-on npm libraries, PostCSS transforms CSS using an extensible plugins API. With more than 200 plugins, developers can lint CSS, support variables and mixins, transpile future CSS syntax, and more.
Logux
Logux
A new way to connect clients and server. Instead of sending HTTP requests (AJAX/REST), it synchronizes the log of operations between client, server, and other clients through WebSockets.

Open source projects

Autoprefixer
Autoprefixer
Autoprefixer lets you write your CSS rules without vendor prefixes.
Browserslist
Browserslist
Defines and shares the list of target browsers between various frontend build tools.
Size Limit
Size Limit
Linter for your JavaScript application that makes the Web lighter by preventing JS library bloat.
OKLCH Color Picker & Converter
OKLCH Color Picker & Converter
OKLCH Color Picker & Converter helps designers and web developers pick and convert colors in OKLCH and LCH color space, enhance a11y in their projects, and prepare for a future with a vibrant P3 color space.
Nano ID
Nano ID
A nano-sized unique string ID generator for JavaScript.
Storeon
Storeon
An event-based, Redux-like state manager for React, Preact, Angular, Vue, and Svelte.
Evil Blocks
Evil Blocks
A tiny JavaScript framework for web pages designed to split your app to separated blocks.
Visibility.js
Visibility.js
A JavaScript library that can detect if a browser tab is currently active for a user.
Nano Stores
Nano Stores
A tiny state manager for React, React Native, Preact, Vue, Svelte, Solid, Lit, Angular, and vanilla JS.
Nano Stores Router
Nano Stores Router
A tiny router for the Nano Stores state manager
KeyUX
KeyUX
JavaScript library to improve keyboard UI of web apps.
SugarSS
SugarSS
An indent-based CSS syntax for PostCSS.
Check TypeScript Definitions
Check TypeScript Definitions
Unit tests for TypeScript definitions in your JavaScript open source library.

Posts

OKLCH in CSS: why we moved from RGB and HSL
OKLCH in CSS: why we moved from RGB and HSL
September 17, 2025
What we learned from creating PostCSS
What we learned from creating PostCSS
August 5, 2025
PostCSS creator shares how to make your open source popular
PostCSS creator shares how to make your open source popular
March 12, 2025
How to make web videos way smaller in 2025 using the AV1 codec
How to make web videos way smaller in 2025 using the AV1 codec
March 4, 2025
How to Favicon in 2025: Three files that fit most needs
How to Favicon in 2025: Three files that fit most needs
February 4, 2025
11 HTML best practices for login & sign-up forms
11 HTML best practices for login & sign-up forms
October 23, 2024
Recapping the first Local‑First conference in 15 minutes
Recapping the first Local‑First conference in 15 minutes
July 8, 2024
Collaborative real-time security: Logux for Akeero
Collaborative real-time security: Logux for Akeero
June 23, 2022
How to use P3 colors with SVGs
How to use P3 colors with SVGs
May 25, 2022
PostCSS 8.0: Plugin migration guide
PostCSS 8.0: Plugin migration guide
September 14, 2020
PostCSS 8.0 is coming: Here's what it brings
PostCSS 8.0 is coming: Here's what it brings
April 6, 2020
What I learned as a developer from accidents in space
What I learned as a developer from accidents in space
January 21, 2020
New home for Logux: Pouring love into an OSS documentation website
New home for Logux: Pouring love into an OSS documentation website
December 18, 2019
Storeon: "Redux" in 173 bytes
Storeon: "Redux" in 173 bytes
April 22, 2019
Faster WebGL/Three.js 3D graphics with OffscreenCanvas and Web Workers
Faster WebGL/Three.js 3D graphics with OffscreenCanvas and Web Workers
April 2, 2019
CSS and JS are at war, here’s how to stop it
CSS and JS are at war, here’s how to stop it
January 29, 2019
Five years of PostCSS: State of the Union
Five years of PostCSS: State of the Union
November 5, 2018
How a month without computers changed me
How a month without computers changed me
October 31, 2018
Speaking with an accent
Speaking with an accent
February 21, 2018
Size Limit: Make the Web lighter
Size Limit: Make the Web lighter
September 5, 2017
Autoprefixer 7.0 and Browserslist 2.0
Autoprefixer 7.0 and Browserslist 2.0
May 6, 2017
PostCSS becomes 1.5x faster
PostCSS becomes 1.5x faster
November 10, 2015
PostCSS Second Birthday
PostCSS Second Birthday
September 7, 2015

Past events

Misconceptions about colors for developers
By Andrey Sitnik
Misconceptions about colors for developers
Sep 25, 2025Product Meetup Barcelona
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Jul 8–10, 2025DevBcn
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Jun 13, 2025React Norway
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
May 8–9, 2025Svelte Summit
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Apr 25–26, 2025BalkanRuby
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Apr 4–5, 2025Commit Conf
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Mar 13–14, 2025t3chfest
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Feb 1–2, 2025FOSDEM
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Nov 29, 2024React Africa
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Nov 26, 2024BarcelonaJS
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Nov 23, 2024DevFest Berlin 2024
Andrey Sitnik from Talks with Ido Evergreen
Podcast with Andrey Sitnik
Andrey Sitnik from Talks with Ido Evergreen
Sep 25, 2024Talks with Ido Evergreen
How to Make Your Open Source Project Popular
By Andrey Sitnik
How to Make Your Open Source Project Popular
Jun 21–22, 2024OpenSouthCode
Panel Discussion: JS Frameworks
By Andrey Sitnik
Panel Discussion: JS Frameworks
Jun 14–15, 2024C3 Dev Festival
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Jun 13, 2024JSNation 2024
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Jun 11–12, 2024OW2con
How to Make Your Open Source Project Popular
By Andrey Sitnik
How to Make Your Open Source Project Popular
Jun 7, 2024Fork it!
How to make your open source project popular
By Andrey Sitnik
How to make your open source project popular
Jun 5, 2024Upstream 2024
Privacy-first architecture
By Andrey Sitnik
Privacy-first architecture
Apr 10, 2024React Amsterdam Meetup
How to Make Your Open Source Project Popular
By Andrey Sitnik
How to Make Your Open Source Project Popular
Mar 7–8, 2024Open Source Day 2024
What I learned as a developer from accidents in space
By Andrey Sitnik
What I learned as a developer from accidents in space
Oct 4, 2023Hacktoberfest Barcelona
What I learned as a developer from accidents in space
By Andrey Sitnik
What I learned as a developer from accidents in space
Jul 26–28, 2023WeAreDevelopers World Congress 2023
Andrey Sitnik from Evil Martians for Devtools FM
Podcast with Andrey Sitnik
Andrey Sitnik from Evil Martians for Devtools FM
Jul 21, 2023Devtools FM
Why OKLCH is the future of colors in CSS
By Andrey Sitnik
Why OKLCH is the future of colors in CSS
Jul 12, 2023Adevinta FrontendDay
CRDT and other new ideas for client-server communication
By Andrey Sitnik
CRDT and other new ideas for client-server communication
Jul 3–5, 2023DevBcn
What I learned as a developer from accidents in space
By Andrey Sitnik
What I learned as a developer from accidents in space
Jun 14, 2023BarcelonaJS
Andrey Sitnik and Using OKLCH for Color
Podcast with Andrey Sitnik
Andrey Sitnik and Using OKLCH for Color
Mar 13, 2023ShopTalk Show
Season 1, Episode 1: Building communities around products
By Victoria Melnikova and Andrey Sitnik
Season 1, Episode 1: Building communities around products
Mar 2, 2023Dev Propulsion Labs
Why OKLCH is the future of colors in CSS
By Andrey Sitnik
Why OKLCH is the future of colors in CSS
Dec 20, 2022FrontSpot Baltic
Future of colors in CSS: why I moved to oklch() from rgb(), hex, and hsl()
By Andrey Sitnik
Future of colors in CSS: why I moved to oklch() from rgb(), hex, and hsl()
Nov 24, 2022BarcelonaJS
Why OKLCH is the future of colors in CSS
By Andrey Sitnik
Why OKLCH is the future of colors in CSS
Apr 28, 2022React Berlin Meetup
What developers can learn from Soviet space program failures
By Andrey Sitnik
What developers can learn from Soviet space program failures
Jan 15, 2021HalfStack
Globalization tools—the state of the Web
Podcast with Andrey Sitnik
Globalization tools—the state of the Web
Sep 11, 2019Google Chrome Developers
How to make a popular open source project
By Andrey Sitnik
How to make a popular open source project
May 27–28, 2019Frontend Conf
How to make a popular open source project
By Andrey Sitnik
How to make a popular open source project
May 24–25, 2019HolyJS
How to make a popular open source project
By Andrey Sitnik
How to make a popular open source project
May 10, 2019Tver.io
What developers can learn from Soviet space program failures
By Andrey Sitnik
What developers can learn from Soviet space program failures
Nov 23–24, 2018NodeFest
CRDT: Conflict-free Data Types for collaborative editing and offline-first
By Andrey Sitnik
CRDT: Conflict-free Data Types for collaborative editing and offline-first
Nov 20, 2018BrooklynJS
CRDT and other new ideas for client-server communication
By Andrey Sitnik
CRDT and other new ideas for client-server communication
Nov 1, 2018ThunderPlains
CRDT and other new ideas for client-server communication
By Andrey Sitnik
CRDT and other new ideas for client-server communication
Oct 24, 2018VueConf
CRDT and other new ideas for client-server communication
By Andrey Sitnik
CRDT and other new ideas for client-server communication
Sep 20–21, 2018EmpireJS
PostCSS way
By Andrey Sitnik
PostCSS way
Aug 27, 2018NYCHTML5
MargieMap / Mad Russian scientist / Serverless server
Podcast with Andrey Sitnik
MargieMap / Mad Russian scientist / Serverless server
Aug 16, 2018TalkScriptFM
CRDT: Conflict-free Data Types for collaborative editing and Offline-first
By Andrey Sitnik
CRDT: Conflict-free Data Types for collaborative editing and Offline-first
Jul 27, 2018NeJS Conf
Logux: Redux actions on the server
By Andrey Sitnik
Logux: Redux actions on the server
Jul 12, 2018Seattle JS
What developers can learn from Soviet space program failures
By Andrey Sitnik
What developers can learn from Soviet space program failures
Jul 11, 2018ManhattanJS
PostCSS way
By Andrey Sitnik
PostCSS way
Jun 8–9, 2018PiterCSS
Logux: Redux actions on the server
By Andrey Sitnik
Logux: Redux actions on the server
May 23, 2018React NYC
CRDT and other new ideas for client-server communication
By Andrey Sitnik
CRDT and other new ideas for client-server communication
May 18, 2018Porto Tech Hub
Logux: Redux actions on the server
By Andrey Sitnik
Logux: Redux actions on the server
Apr 11, 2018ReactNYC
Browserslist: one config to rule them all
By Andrey Sitnik
Browserslist: one config to rule them all
Mar 2, 2018QueensJS
Size Limit: make the Web lighter
By Andrey Sitnik
Size Limit: make the Web lighter
Nov 1, 2017ReactiveConf
Using Logux in production
By Andrey Sitnik
Using Logux in production
Oct 25–27, 2017ReactiveConf
Using Logux in production
By Andrey Sitnik
Using Logux in production
Oct 23, 2017React Vienna
Logux, a new approach to client-server communication
By Andrey Sitnik
Logux, a new approach to client-server communication
Oct 19, 2017React Summit
Using Logux in production
By Andrey Sitnik
Using Logux in production
Oct 19, 2017Eventloop
Robots must suffer: linters and tools for frontend development
By Andrey Sitnik
Robots must suffer: linters and tools for frontend development
Aug 26, 2017FEday
Using Logux in production
By Andrey Sitnik
Using Logux in production
Jul 12, 2017Meetup.js Buenos Aires
Stylelint: why and how to lint CSS
By Andrey Sitnik
Stylelint: why and how to lint CSS
Jun 28, 2017Frontend RJ
Logux, a new way of client-server conversation
By Andrey Sitnik
Logux, a new way of client-server conversation
Mar 28, 2017React London
Stylelint: why and how to lint CSS
By Andrey Sitnik
Stylelint: why and how to lint CSS
Jul 1, 2016CSSParis
The componentization of the Web
By Andrey Sitnik
The componentization of the Web
May 11, 2016CSSConf Budapest
Fix global CSS with PostCSS
By Andrey Sitnik
Fix global CSS with PostCSS
Dec 4, 2015dotCSS
PostCSS: the future after Sass and LESS
By Andrey Sitnik
PostCSS: the future after Sass and LESS
Jun 18–19, 2015CSSConf US
PostCSS: the future after Sass and LESS
By Andrey Sitnik
PostCSS: the future after Sass and LESS
Apr 15, 2015Frontend.fi

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