One year of Pinafore

Screenshot of Pinafore showing a compose input

Pinafore is a standalone web client for Mastodon, which recently hit version 1.9.0. Here are some notable new features:

It’s been about a year since I first launched Pinafore. So I’d like to reflect on where the project came from, and where I hope to take it.


In 2017, I was in a funk. I had stopped contributing to the PouchDB project largely due to burnout, and for various reasons I eventually left my job at Microsoft. In the meantime, I had become enamored of Mastodon and even contributed to it, but I was feeling restless and looking for a new project.

The Mastodon codebase is extremely well-written. I’m convinced that Eugen Rochko is some kind of savant. However, I never took much of a liking to React, and I found it difficult to fix some fundamental problems in the Mastodon UI, such as offline support or the occasionally jerky scrolling. I also really missed the single-column layout of Twitter (I was never a Tweetdeck fan).

So the idea came to me to create my own Mastodon web client. I had been working on web sites for years, but aside from some small prototypes, I had never built an entire web app by myself. This was an opportunity to test some of my ideas about how a web app “should” be, leveraging my experience in web performance and standards. Also, I wanted to teach myself about accessibility, which I had never really studied before.

I knew I wanted to use Svelte, because I agreed with Rich Harris and Tom Dale that JavaScript frameworks should focus less on being runtime APIs and more on being compilers. Incidentally, I was at the same talk by Jed Schmitt that Rich mentions in this video, and it blew my mind as much as it blew his. (The difference between Rich and me is that he actually went off and built a whole framework based on it!)

I started working on Pinafore at the end of December 2017, and released it in April 2018. So after 18 months of development, I’d like to consider where Pinafore has done well and where it can improve.

Success metrics

Pinafore doesn’t have any trackers on it, so I don’t know how many people are using it. Sure, I could use a privacy-respecting tracker like Fathom, but the Mastodon community is pretty allergic to any kind of tracking, so I’ve been hesitant to add it. In any case, I don’t really care, because I would work on Pinafore regardless of how many people are using it.

However, I do get a trickle of questions and bug reports about Pinafore, and the #Pinafore hashtag is pretty active. I’ve also heard from several folks that it’s their preferred Mastodon interface. The reasons they give are usually one of the following:

  • Accessibility: I’ve focused a lot on making Pinafore work well with keyboard navigation and screen readers. (Marco Zehe‘s guidance really helped!)
  • Design: the single-column layout of Pinafore is a key differentiator with the Mastodon frontend (although not for long).
  • Instance-switching: people who juggle multiple accounts on different instances don’t necessarily want one browser tab for each.

My favorite user testimonial, though, is from my wife. She told me, “I like Pinafore because it never loses my place in the timeline.” (Much of my motivation for working on Pinafore can be credited to “wife-driven development” – I like making her happy!)

So this confirms that I’ve achieved at least some of the goals from the Pinafore introductory blog post. Although notably, offline support is rarely mentioned, but I’ll get to that later.


Pinafore has also benefited from a lot of community contributions. I’d like to specifically thank:

And of course everyone else who contributed. Thank you so much!

There are some challenges with building a dev community around Pinafore. The app is implemented using Svelte v2 and Sapper, which unfortunately causes two downsides in terms of onboarding: 1) Svelte isn’t a very well-known framework, and 2) Svelte v2 is incompatible with Svelte v3, and there’s no upgrade path currently.

I’ll have to continue grappling with these challenges, but for now I’m very satisfied with Svelte v2. It’s fast, lightweight, and does everything I need it to. So I’m not in a big hurry to upgrade.

And oh yeah: Svelte really is lightweight. Pinafore only loads 32KB of compressed JavaScript for the landing page, and 137KB for the Home timeline. The total size of all JS assets is under 300KB compressed (<1MB raw). It gets a perfect 100 score from Lighthouse.

Screenshot of Lighthouse showing perfect 100 score in all categories, including Performance, Accessibility, Best Practices, and SEO

If you didn’t think I was going to brag about web perf vanity metrics, then you don’t know me very well.

Future plans

My first goal with Pinafore is completeness. Even though I’ve been working on it for over a year, there are still plenty of missing features compared to the Mastodon frontend. And although the gap has been narrowing, Mastodon itself hasn’t stopped innovating, so there’s always new stuff to add. (Polls! Blurhash! Keybase! Does Eugen ever sleep?)

Beyond that, I’d like to start focusing on features that make Pinafore a more pleasant social media experience. One of the virtues of decentralized social media is that we can experiment with features that give people control over their social media experience, even if it hampers addictiveness or growth. To that end, I’ve added a set of wellness features, inspired by Tristan Harris’s Center for Humane Technology. I’ll probably tweak and expand these features as feedback rolls in.

I’d also like to improve offline support. Even though Pinafore does have an offline mode, and even though it uses a Service Worker to cache static assets, it’s not very offline-first. Instead, it uses offline storage more as a fallback for when the network fails, rather than as the primary source of truth.

Given my background working on offline-first technology and advocating for it, I find this a bit disappointing. But it turns out that it’s really difficult to implement an offline-first social media UI. How do you deal with offline writes? How do you handle the gap between fresh content and stale content within the same timeline? These are not easy questions, and for the most part I’ve punted on them. But Pinafore can do better.


Pinafore is a passion project for me. It gives me something interesting to do on weekends and evenings, and it teaches me a lot about how the web platform works.

I also see Pinafore as an opportunity to provide more options to the Mastodon community, and to prove that you don’t have to treat Eugen as a gatekeeper for every minor UI tweak you’d like to see in Mastodon. Mastodon is decentralized; let’s decentralize the interface!

I have every intention to keep working on Pinafore, and I’m curious to know where you think it should go next.

2 responses to this post.

  1. Posted by Étienne BERSAC on June 3, 2019 at 12:03 AM

    Kudo !!!


  2. In the ActivityPub panel session FOSDEM, Chris Webber made some comments I found intriguing about how the AP drafters imagine web client and back-end being quite modular, linked to each other via the client>server part of the AP spec. The idea being that you could use the web client of Mastodon to login to a PeerTube instance and vice-versa, allowing users to have one account for all fediverse activity, but still use the UI relevant to what kind of media they’re trying to interact with. I’d love to see you experiment with the client>server part of AP in Pinafore.


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