Extend UI
Dev tools
ui component library
SHOW HN2026
252points
81comments
#191of 4,366 in 2026
Top 5%of 2026 by points
How HN took it
CuriousMostly questions and neutral comments
13 positive, 32 neutral or asking, 2 mixed, 17 critical, out of 64 comments about the project. Thread score -0.06.
Performance: 0 for, 7 againstIdea: 6 for, 1 againstExecution: 0 for, 6 againstDesign: 3 for, 1 againstDocs: 0 for, 2 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Polished, well-designed components
From 2 comments
Seeing a lot of criticism in here, some valid, some not. Just wanted to say that, to me, this is really well put together - and seems like a lot of thought went into this.…
kalms on HNThanks, that looks awesome! We were looking to add DOCX and XLSX preview to our app, and were planning to do server-side conversion to PDF (which seems to be what most other apps…
hobofan on HN
Useful for document workflows and open-sourcing it
From 2 comments
Super cool. Working on a local AI tool specifically for document workflow automation (where context = screen/web/folders/files), and this could come in super useful. I do most of…
dvt on HNits nice, people are harsh, you did something useful, thank you.
codingconstable on HN
Objections
Site and demos perform poorly, lagging and CPU-heavy
From 4 comments
The performance is quite bad. There are some basics missing or broken. - no caching for file previews - no sorting by date in the file picker - no sorting by size in the file…
lionkor on HNLooks cool but your home page heavily lags on my mbp m3 pro - you should maybe be lazy loading vs loading all your components upfront
pea on HNThe performance of the "Layout blocks" component is particularly bad. It consumes tons of CPU when scrolling.
bduffany on HNThe performance on the site is truly terrible, the top animation was probably going at 5fps when scrolling.
iamsaitam on HN
React-only and built on Next.js, not framework-agnostic
From 3 comments
These should really be web components. Leaving out every framework other than React is really bad for the web.
spankalee on HNNot just React, but it apparently also depends on Next.js Dependency in package.json: - https://github.com/extend-hq/ui/blob/main/apps/v4/package.json Dependencies in some…
resurge on HNWhy doesn't it mention anywhere that they are React components?
egeozcan on HN
File picker and document viewer missing basic features
From 1 comment
The performance is quite bad. There are some basics missing or broken. - no caching for file previews - no sorting by date in the file picker - no sorting by size in the file…
lionkor on HN
Docs did not clearly state React dependency
From 2 comments
Why doesn't it mention anywhere that they are React components?
egeozcan on HN_Try_ to? Are you serious? We're not taking ambiguity due to phrasing, we're talking straight up not mentioning it on either the front page, on the show all page or even on the…
hju22_-3 on HN
Requests
Web components or framework-agnostic support
From 2 comments
These should really be web components. Leaving out every framework other than React is really bad for the web.
spankalee on HNExperienced the same nightmare a few times over with citations. React/next is limiting, we have rebuilt this for angular and now redid it again using lit for better…
sails on HN
Performance optimisation of the site and demos
From 2 comments
Looks clean and works fine, but it needs optimization. Clicking "Type" in the "schema builder" example takes 1~2 seconds to open the popover in the landing page(macbook pro m4).…
plastic041 on HNHeard the performance feedback will work on it today!
andrewlu0 on HN
Markdown file support
From 1 comment
Does it/will it support Markdown files?
stinger on HN
Better file picker sorting and search
From 1 comment
The performance is quite bad. There are some basics missing or broken. - no caching for file previews - no sorting by date in the file picker - no sorting by size in the file…
lionkor on HN
Questions
How does PDF rendering fidelity compare to alternatives
From 2 comments
How is your PDF coverage? They are notoriously difficult things to render, with endless edge cases. Mozilla’s PSD.js is the status quo here, so what do you do better than them?
promiseofbeans on HNHow does it compare to https://news.ycombinator.com/item?id=48436863 ?
phonon on HN
Whether pages are virtualised in the viewers
From 1 comment
Those bounding box demos are decent. By quirk of fate i've spent the past 2 days prototyping some stuff on pdfjs. Just trying to figure out a game plan for handling bounding…
CraigJPerry on HN
Alternatives named
react-pdf / PDF.js
From 2 comments
How is your PDF coverage? They are notoriously difficult things to render, with endless edge cases. Mozilla’s PSD.js is the status quo here, so what do you do better than them?
promiseofbeans on HNWe use react-pdf for the viewer which I believe uses pdf JS under the hood We aren’t not trying to reinvent that engine, rather just provide a building block for people to plug…
andrewlu0 on HN
Server-side conversion to PDF
From 1 comment
Thanks, that looks awesome! We were looking to add DOCX and XLSX preview to our app, and were planning to do server-side conversion to PDF (which seems to be what most other apps…
hobofan on HN
ChromaFiler
From 1 comment
If you're on Windows, you can check out ChromaFiler, which takes Miller columns to the next level: https://chroma.zone/chromafiler/
carlosjobim on HN