Show HN: Ferrite – Markdown editor in Rust with native Mermaid diagram rendering

https://github.com/OlaProeis/Ferrite

154•OlaProis•8h ago

Ferrite: Fast Markdown/Text/Code editor in Rust with native Mermaid diagrams

Built a Markdown editor using Rust + egui. v0.2.1 just dropped with major Mermaid improvements:

→ Native Mermaid diagrams - Flowcharts, sequence, state, ER, git graphs - pure Rust, no JS

→ Split view - Raw + rendered side-by-side with sync scrolling

→ Syntax highlighting - 40+ languages with large file optimization

→ JSON/YAML/TOML tree viewer - Structured editing with expand/collapse

→ Git integration - File tree shows modified/staged/untracked status

Also: minimap, zen mode, auto-save, session restore, code folding indicators.

~15MB binary, instant startup. Windows/Linux/macOS.

GitHub: https://github.com/OlaProeis/Ferrite

v0.2.2 coming soon with performance improvements for large files. Looking for feedback!

Comments

pbronez•7h ago

Is mermaid rendering implemented in Rust, or are you running mermaid.js in a JS interpreter somewhere?

On other systems I’ve run into challenges rendering markdown documents with many mermaid diagrams in them. It would be nice to have a more robust way to do this.

lkschubert8•7h ago

Looks like it’s currently a subset of mermaid natively in rust https://github.com/OlaProeis/Ferrite/blob/master/src/markdow...

jasonjmcghee•7h ago

(not associated, just looked at the code - no js interpreter)

https://github.com/OlaProeis/Ferrite/blob/master/src/markdow...

OlaProis•34m ago

100% pure Rust! No JS interpreter. Parses Mermaid syntax directly and renders via egui drawing primitives. Supports 11 diagram types: flowchart, sequence, state, class, ER, pie, mindmap, timeline, user journey, git graph, gantt. Much faster than spawning headless Chrome!

Arubis•7h ago

I happily paid money for Typora, which does roughly the same thing for just Markdown without support for JSON, Yaml (that I know of). This feels like a ripe space, especially with LLMs eagerly outputting reams of parseable text with embedded diagrams.

vunderba•4h ago

+1 happy user of Typora. I really like its ability to auto-create a related assets folder for embedded media as it’s dragged into a doc.

gregman1•4h ago

The $15 price tag for Typora seems a bit steep considering the fundamental features it provides.

swiftcoder•2h ago

The price of a fancy burger doesn't seem all that unreasonable for a piece of software one finds even moderately useful (of course, depending on your local exchange rate that may be more or less true)

OlaProis•44m ago

Thanks! Typora is great - Ferrite aims for similar polish but with native Mermaid, structured data support (JSON/YAML/TOML tree viewer), and the pipeline feature for shell integration. And it's open source!

huevosabio•7h ago

Nice to see an egui project that doesn't have super obvious egui aesthetics.

How did you find working with egui?

koakuma-chan•6h ago

> How did you find working with egui?

Claude Code would have preferred React.

GrowingSideways•6h ago

How would this have worked outside of catering to browsers?

steezeburger•6h ago

You can render React all over the place now!

echelon•5h ago

Native code and speed will be a differentiator.

If the value of JavaScript programming goes down, Rust programming will probably hold value a little bit longer.

OlaProis•42m ago

egui is fantastic for rapid prototyping - immediate mode makes state management simple. Main limitation: TextEdit isn't designed for code editors (no multi-cursor, can't hide folded text). v0.3.0 will replace it with a custom widget. The default styling does scream "egui" - spent time on custom theming to avoid that

Levitating•7h ago

Made with egui, if anyones wondering.

I love the new era of graphical applications in Rust.

khimaros•6h ago

seems like a promising alternative to obsidian, but missing [[wikilinks]] and back references

bthallplz•5h ago

Yes! I was looking at it and hoping they had that feature already. I so want an Obsidian alternative to exist just in case.

Thanks for posting the GitHub issue!

OlaProis•35m ago

Not yet! [[wikilinks]] and backlinks are natural additions. I will add it to the Roadmap? Love community input on what Obsidian features matter most!

adamnemecek•6h ago

Consider adding support for Typst.

GrowingSideways•6h ago

Or even better, TeX. I realize capital bought out even basic typesetting but let's not encourage this

regenschutz•3h ago

Typst is open-source.

GrowingSideways•3h ago

Open source doesn't mean relinquished from capital by any means. I also don't blame the author of typst. But TeX is truly free from capital, and that should mean far more than the aesthetics of a nicer interface.

OlaProis•34m ago

Interesting idea! Typst is compelling (Rust-based too). Not on immediate roadmap but could be a future addition. TeX is heavier but possible via external tools + pipeline feature.

dmitrygr•6h ago

For those who, like me, read this and thought "what the hell is a mermaid diagram?", apparently it is a method to describe simple flow diagrams using markdown-like text. More here: https://mermaid.js.org/

chaboud•2h ago

Next time you're vibe coding something, have the system generate a mermaid diagram to show its understanding. Though visual generation can be hard for models, structure/topology in formats like mermaid is pretty gettable.

I've even found sonnet and opus to be quite capable of generating json describing nodes and edges. I had them generate directed acyclic processing graphs for a GUI LLM data flow editor that I built (also with Claude - https://nodecul.es/ if curious)

dhruv3006•6h ago

Building an api client based on markdown as well - https://voiden.md

random3•5h ago

And what's the connection with the thread?

WillAdams•6h ago

Made the fan in my Windows 11 laptop spin up.

nurettin•5h ago

This is why I prefer clunky hardware with heating cpus and a slow disk. You can easily feel that you wrote bad code from audio and tactile feedback.

corysama•5h ago

I’ve heard of people doing ambient performance profiling by instrumenting their code to insert clicks into an audio buffer based on a high precision clock and piping it out a speaker. You get to learn the sound of your code at 44.1KHz

vunderba•4h ago

This might be the most absurdly terrific thing I’ve read in a while - like a profiler equivalent of a Geiger counter.

bschwindHN•2h ago

We did something like that for a hiring project once:

https://github.com/tonarino/acoustic_profiler

OlaProis•40m ago

Which view/file caused this? v0.2.2 (coming soon) has significant performance optimizations for large files - deferred syntax highlighting, galley caching. If you can reproduce, please open an issue with details!

bananaboy•5h ago

Nice to see native markdown rendering rather than relying on spawning chromium and taking screenshots like some other libraries do!

quintu5•1h ago

One major downside of native rendering is the lack of layout consistency if you’re editing natively and then sharing anywhere else where the diagram will be rendered by mermaid.js.

bananaboy•29m ago

Yes that's true. For my use-case I want to render the diagram out to a png though and embed it in a confluence page.

OlaProis•42m ago

Valid point! Native rendering won't be pixel-perfect with mermaid.js. The trade-off is speed and no JS runtime. For documents staying in Ferrite, it's great. For sharing, we're adding SVG export in v0.3.0 so you can use mermaid.js for final renders if needed.

random3•5h ago

This is cool. I was hoping to see progress coming from Zed (e.g. because Tree-sitter → https://github.com/tree-sitter-grammars/tree-sitter-markdown) but it's exciting to see this. I'm a heavy Obsidian user, and I love it, but I'd love to see real alternatives focused on foundations.

It would be interesting to know more about the end-goal if any.

Best of luck! I'll watch this.

echelon•5h ago

What is Obsidian written in? Electron?

atlintots•4h ago

Yes; it's also not open source.

echelon•3h ago

I'm fine with that.

Open source purity is problematic. The OSI was established by the hyperscalers, who are decidedly not open source either.

Purely "OSI-approved open source" mandates having no non-commercial or non-compete clause, which means anyone can come in and bleed off profits and energy from the core contributors of open source projects. It prevents most forms of healthy companies from existing on top.

We shouldn't be allergic to making money with the software we write - life is finite and it's more sustainable over the long term to maintain software as a job.

The new "ethical source" / "fair source" licenses that have been popping up recently [1, 2] give customers 100% use of the code, but prevent competitors from coming in and stealing away the profits from running managed offerings, etc. (I wish Obsidian were this, but it's fully closed. Still, I do not admire them any less for this choice. We venerate plenty of closed creators - it's silly to hold software to a different standard.)

AWS profits hundreds of millions a quarter off of open source developed by companies thinking they were doing the right thing. AWS turned these into a proprietary managed solutions and gave nothing back to the authors. The original wind up withering and dying. AWS isn't giving back, they're just hoovering up.

Obsidian being closed means the core authors are hyper focused and can be compensated (even if it's not much). It's not like they can rug pull us - the files are text files, we can use old versions, and if they did piss us off I'm sure someone would write an open source version.

[1] https://fair.io/

[2] https://faircode.io/

dvt•3h ago

Fully agree that pushing OSI is just posturing. After all, Amazon/Google/Facebook have made literal billions by commercializing open source software. I release stuff on MIT all the time (for things I'm okay with people poaching) but I'd argue the only "pure" OSS license is GPL, which comes with its own problems (and, as we all know, it infects everything it touches).

The problem with FSL is that it hasn't been tested in the courts yet (afaik), so it's a bit of a gamble to think it'll just "work" if some asshole does try to clone your repo and sell your work. Maybe it's a decent gamble for a funded startup with in-house counsel, but if you're just one guy, imo keep stuff you want to sell closed-source, it's not that big of a deal. We've been doing just that since the 70s.

gregman1•4h ago

It’s closed source but yeah - electron all the way.

kirubakaran•3h ago

Since you're an Obsidian user, can I please get your feedback on https://hyperclast.com/ which I'm building?

(I'm not quite ready to do a Show HN yet, so please don't post it, but I'm ready for some early feedback if you'll indulge me)

tomtom1337•1h ago

You need something "more" on the website before you ask people to create an account. "Team workspace that stays fast" isn’t clear enough for me, at least. What is a workspace? What does the interface look like? Is it in the browser? Is it an app?

People will go "what is this?", "huh, I’m not gonna make a user for this, can’t tell what it is". Those are my 2 cents.

kirubakaran•1h ago

Thanks, I'll fix that.

maxbond•52m ago

Disclaimer: I'm not your target audience, I don't care about collaboration or performance.

- There's a heavy emphasis on performance. Are you sure customers care about that more than real time collaboration and self hosting? (I don't think they care about CRDTs.)

- If I am experiencing pain because eg my Notion wiki is too big and is having serious performance issues, what I want to hear immediately is how you are going to help me migrate from Notion to your solution. Notion has a feature to export an entire workspace; can you ingest that and get me spun up with your product?

- If I hear something is open source I expect to be able to try it out immediately without logging in. It looks like you can do that but when you hit "Get Started" it puts you into a registration flow.

- You might take a look at how Zed is marketing themselves, they have a similar pitch (performance + realtime collaboration). The first thing they try to show you is a video where they demo the product and show how fast it is. (I think they focus too much on performance though.)

- The frontend is a web app right? If possible rather than a video, embed the interface in your landing page. If possible, let them share their document and try out collaborating on it with someone or with another browser tab. Give them an opportunity to be impressed.

I respect anyone who posts their work. Best of luck.

kirubakaran•24m ago

Thank you!

> There's a heavy emphasis on performance. Are you sure customers care about that more than real time collaboration and self hosting?

- Good point, I'll find out

> Notion has a feature to export an entire workspace; can you ingest that and get me spun up with your product?

Yes, I'm almost done with this feature

> If I hear something is open source I expect to be able to try it out immediately without logging in. It looks like you can do that but when you hit "Get Started" it puts you into a registration flow.

I link to that elsewhere in the page: https://hyperclast.com/dev/ I'll look into making this more prominent.

> You might take a look at how Zed is marketing themselves

Thanks, will do

> embed the interface in your landing page

Great idea, I'll do that!

OlaProis•48m ago

Thanks! The end-goal is a fast, native Markdown editor that "just works" - no Electron, no web tech, instant startup. v0.3.0 will extract Mermaid as a standalone crate and build a custom text editor widget to unlock features egui's TextEdit blocks (proper multi-cursor, code folding). Long-term: potentially extract the editor as a headless Rust library since that's missing in the ecosystem. See ROADMAP.md for details

fuddle•5h ago

Whats the advantage of using Ferrite versus VS Code with a Mermaid extension?

dcreater•3h ago

Rust + Native App I take it

littlestymaar•2h ago

The VSCode markdown viewer kind of sucks tbh.

OlaProis•38m ago

> - ~15MB vs ~300MB+ (no Electron) > - Instant startup vs seconds > - Native Mermaid rendering (no extension juggling) > - Built-in JSON/YAML tree viewer with pipeline shell integration > - Session restore, minimap, zen mode baked in > > If you live in VS Code already, an extension might be fine. Ferrite is for those wanting a focused, fast Markdown environment.

FloatArtifact•5h ago

Any interest in a plugin system similar to Obsidian?

silcoon•4h ago

Why did you remove AI agent configurations and instructions from the repo? See .gitignore

dcreater•3h ago

Good catch. For me its a red flag when the dev does not disclose AI usage

WD-42•3h ago

It's vibe coded. The entire project is only 10 commits, a few of them are giant with a bunch of markdown files full of emojis in the docs/ folder.

OlaProis•39m ago

Fair point - I should be more transparent. Yes, Claude assisted significantly with development. The .gitignore excludes AI config files because they where not needed in the project and aren't useful to others. I'll add a note to the README about AI-assisted development. The code is reviewed and understood, not blindly accepted.

sean_pedersen•4h ago

Like the idea but it spawns a terminal on startup on Mac and is not WYSIWYG (like Obsidian). Hope this project develops into usable state soon.

OlaProis•41m ago

Thanks for reporting! This is a packaging issue - need to create a proper .app bundle. On the roadmap for v0.3.0 (macOS signing & notarization). For now, running from terminal is the workaround.

msephton•4h ago

Will need a magnifying glass to see the text on the screenshots.

I find it makes sense to take screenshots in a window big enough to show what's going on, but no bigger. This means probably not full screen, or maximised, especially if you're running at a very high resolution. If there's a lot of dead/empty space in the window that's a signal it's too big. This way you guarantee the screenshots are readable without zooming in, on smaller displays than your own, for example mobile.

listic•2h ago

Doesn't install on Ubuntu 22.04 LTS due to dependecy problems. Filed a bug: https://github.com/OlaProeis/Ferrite/issues/6

OlaProis•18m ago

Thanks for reporting! This is a build environment issue - v0.2.1 was built on Ubuntu 24.04 which has newer glibc (2.39) and libssl3t64.

*Fix:* I've updated the CI to build on Ubuntu 22.04, which will make the .deb compatible with 22.04+.

This will be included in v0.2.2. For now, workarounds: 1. Use the `ferrite-linux-x64.tar.gz` (standalone binary) instead of .deb 2. Build from source: `cargo build --release`

Sorry for the inconvenience!

Bishonen88•2h ago

Looking at the Screenshots, this would've taken days/weeks e.g. 5 years ago. Now this seems to be vibe coded in 2 sessions. Crazy world we live in.

_flux•1h ago

Seems like Mermaid parsing and layout would be a useful crate as by itself. I would enjoy a fast mermaid layout command line tool with svg/pdf/png support, which I think would be quite feasible to implement with such a crate.

OlaProis•45m ago

This is exactly the plan for v0.3.0! Extracting the ~7000 line Mermaid renderer into a standalone crate with SVG/PNG output and CLI support. Pure Rust, WASM-compatible. Stay tuned!

bananaboy•29m ago

That's great! I'm pretty interested in that. I hooked up `mark` [1] at work to upload md files to our internal confluence and would love to integrate a native tool to convert Mermaid diagrams to a png rather using mark's built-in system which calls out to mermaid.js and thus needs us to vendor chromium, which I'd rather avoid!

[1] https://github.com/kovetskiy/mark

mgaunard•1h ago

The main issue is that Markdown remains a pretty primitive language to write documents in, with dozens of incompatible extensions all over the place.

I don't know if it's the best format to focus on.

k_bx•35m ago

We need privacy-focused Obsidian alternative (which doesn't store unencrypted text files on disk), excited to see a potential player written in my tech stack, meaning it should be easy to extend!

nico_h•24m ago

It’s a cool name but there is already another project called ferrite, related to audio recording. https://www.wooji-juice.com/products/ferrite/

napoleongl•20m ago

Looks interesting! I’m discouraged from using mermaid and D2’s online playground for privacy reasons and have hand on my roadmap to get a local editor. This might be it! Does it support theming of mermaid diagrams, I noted the style keywords were in the roadmap still.

Show HN: Ambient Shield – Cinema mode for dual-monitor setups

Live Coding Trance Music from Scratch in Strudel [video]

Show HN: Bound – local code autocomplete LLM fine-tuned on your repository

Exa.ai is indexing personal site data ignoring robots.txt

Show HN: Building a Recommender System for GitHub Repositories

To Close or Not to Close

Ask HN: Is Web Development in a rut?

Analysis of LLM advancement: impactful LLMs in Q3 2027

Ontology and Information Systems

Not all Chess960 positions are equally complex

The first electrical assisted E-ski mountaineering device

Italy Fines Cloudflare for Refusing to Filter Pirate Sites on Public 1.1.1.1 DNS

Pulling a new proof from Knuth's fixed-point printer, with code in Ivy

I can't believe FreeBSD 15 is faster than Linux Debian 13 in benchmarks, but

Magic Piano [video]

(Open Source) Anonymized, live replicas on demand for dev, test and stage

Does your laptop Mac get scanned for malware?

Goscript: Transpile Go to human-readable TypeScript

When AI Speaks, Who Can Prove What It Said?

X Is a Power Problem, Not a Platform Problem

Show HN: Gyesme – exploring modularity and dependency boundaries in GNOME

How Safe Is the Rust Ecosystem? A Deep Dive into Crates.io

My favorite sci-fi books about sci-fi books about understanding the "enemy"

My fav books for understanding how AI is changing society and human interaction

GPT-5.2 Solves *Another Erdős Problem, #729

Design Amnesia

Lego Farming Blocks: Letting AIs Grow Our Food

Show HN: A policy enforcement layer for LLM outputs (why prompts weren't enough)

Ask HN: Senior software engineers, how do you use Claude Code?

Milano Cortina Winter Olympics threatened by Cloudflare funding withdrawal