APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product. Learn more →
Wpt Alternatives
Similar projects and alternatives to wpt
-
-
AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
-
-
-
-
WebKit
Home of the WebKit project, the browser engine used by Safari, Mail, App Store and many other applications on macOS, iOS and Linux.
-
-
SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
-
-
-
-
-
-
-
-
EACL
Enterprise Access ControL is an embedded Clojure ReBAC authorization library based on SpiceDB and backed by Datomic that provides fine-grained permissions (by theronic)
-
-
uBlock-Safari
uBlock Origin - An efficient blocker for Chromium, Firefox, and Safari. Fast and lean.
-
SpecPilot
Spec-driven development (SDD) CLI for AI coding agents (Claude Code, Cursor) - initialize, validate, and sync .specs/ across TypeScript & Node.js projects
-
-
-
SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better wpt alternative or higher similarity.
wpt discussion
wpt reviews and mentions
Posts with mentions or reviews of wpt.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2026-09-13.
-
Ask HN: What are you working on? (September 2026)
I'm building a Python Browser and need you help running agents on conformance tests https://github.com/byteface/chromonic/
cd to tests/layout..
git clone --depth=1 https://github.com/web-platform-tests/wpt.git
tell it to run the tests and fix any issues with layout and append any issues with domonic into the PLAN.md
I'm targetting the CSS2 folder atm.. so you can tell it to switch to any folder within there for now.
Thanks,
-
This Month in Ladybird – August 2026
> what test cases do you consider for making something like this? how do you determine if you have handled all the outliers or not?
The ~2 million Web Platform Tests https://github.com/web-platform-tests/wpt. They also handle most of the backwards compatibility. The rest is engine developers manually comparing against each other's engines.
- is all the code written in c++ or is it rust these days?
There's still a lot of C++, but new code is increasingly Rust. To what degree varies by engine: Servo (and Blitz) are almost entirely Rust. Ladybird was 100% C++ in February, but is now 25% Rust. Firefox has significant and actively developed core components in Rust, but isn't actively converting more core modules. Chromium doesn't have any core components in Rust yet, but has invested heavily in converting foundational dependencies like FreeType and HarfBuzz to Rust. Safari is the outlier, I believe it doesn't use any Rust yet.
- how many people in a team do you need and how long would it take to write a browser engine from scratch
I've heard estimates that Chrome has a team of >1000, Firefox 500-800, Safari 100-200, Servo / Ladybird are more like 5-10. I've been building Blitz by myself for ~3 years. Something like 3-5 years is probably a minimum if you're truly building from scratch unless you have a really large team backing it, and depending on your success criteria.
- how is mobile vs desktop handled at the browser engine code level?
There are actually surprisingly few differences beyond touch input and screen size handling.
-
Cloudflare Kitesurf: What Beginners Should Learn About AI App Tradeoffs In 2026
Kitesurf reflects that distinction. It uses pieces of the modular Blitz HTML/CSS rendering engine, runs its components in isolated Workers, and exposes enough of the Chrome DevTools Protocol for compatible automation tools. Cloudflare reported that it already passed more than 215,000 tests from the Web Platform Tests project, then added integration and visual-regression tests against real sites because standards conformance alone could not prove the whole job.
-
Show HN: Iworked on a new browser for 2 years, today it passed Acid 3
https://github.com/web-platform-tests/wpt/commits/master/aci... shows the history of the web-platform-tests copy of WPT, which has mostly followed Hixie’s earlier updates to Acid3 by simply commenting out assertions that no longer match what specs say.
-
Introducing Saturon: A Grammar-Aware Runtime for CSS Color Level 5
Saturon passes the full Web Platform Tests for CSS Color validation, with only a few exceptions (sign() with font-relative units).
-
Firefox is the best mobile browser
> As long as you pass Apple's arbitrary rules, you can make your own browser for iOS. Ladybug uses Apple's test suite as an arbitrary measure of completeness.
The browser is called Ladybird and it isn’t Apple’s test suite, web-platform-tests is a collective effort all the major players contribute to. Almost two thousand people have contributed to it:
https://github.com/web-platform-tests/wpt/graphs/contributor...
-
Show HN: C++ Compiler Support Page
Having something like WPT [1] for C++ would be really nice.
[1] https://github.com/web-platform-tests/wpt
-
WebShield – A new wide-spectrum content blocker for Safari
Blink forked from Webkit more than a decade ago. There are tests that try to measure their compatibility, like https://wpt.fyi/results/?label=experimental&label=master&ali... (part of https://web-platform-tests.org/). They also have different JS engines these days (V8 vs JSCore).
That said, as a frontend dev, I very very rarely run into real world issues between Safari and Chrome. More often it's Firefox/Gecko that lags behind, usually in some sort of graphics optimization (SVG and canvas stuff). Also some differences in WebGL and webgpu support, but those are niche enough that it's not a big deal yet.
- Show HN: Dropflow, a CSS layout engine for node or <canvas>
-
The Ladybird Browser Project
It also helps that there are tests
https://web-platform-tests.org/
-
A note from our sponsor - AppSignal
www.appsignal.com | 6 Oct 2026
Stats
Basic wpt repo stats
28
6,209
10.0
3 days ago
web-platform-tests/wpt is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.
The primary programming language of wpt is HTML.
Sponsored
Monitoring that respects your time & budget
APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
www.appsignal.com