frontpage.
newsnewestaskshowjobs

Made with ♥ by @iamnishanth

Open Source @Github

fp.

Open in hackernews

Cal.diy: open-source community edition of cal.com

https://github.com/calcom/cal.diy
79•petecooper•2h ago

Comments

bluehatbrit•1h ago
Cal.com has always had an open source community edition, I've been using it for some time. Is this just a rebrand of that line?
geoffschmidt•1h ago
https://cal.com/blog/cal-com-goes-closed-source-why
rectang•57m ago
I'm unpersuaded by the assertion that closing the source is an effective security bulwark.

From that page:

> Today, AI can be pointed at an open source codebase and systematically scan it for vulnerabilities.

Yeah, and AI can also be pointed at closed source as soon as that source leaks. The threat has increased for both open and closed source in roughly the same amount.

In fact, open source benefits from white hat scanning for vulnerabilities, while closed source does not. So when there's a vuln in open source, there will likely be a shorter window between when it is known by attackers and when authors are alerted.

hungryhobbit•47m ago
If you believe they really did it for security, I have a very nice bridge to sell you for an extremely low price ...

Look, tech companies lie all the time to make their bad decisions sound less bad. Simple example: almost every "AI made us more efficient" announcement is really just a company making (unpopular) layoffs, but trying to brand them as being part of an "efficiency effort".

I'd bet $100 this company just wants to go closed source for business reasons, and (just like with the layoffs masquerading as "AI efficiency") AI is being used as the scapegoat.

rectang•17m ago
Who says I believe it? ;)

I'm just choosing to focus on the substance of the argument itself, which I think is risible regardless of who makes it and why.

raphaelcosta•1h ago
It’s curious what they said in the email they sent me about the OSS version.

------

A few important changes to note:

We will no longer provide public Docker images, so your team will need to build the image yourselves.

Please do not use Cal.diy — it’s not intended for enterprise use.

FlamingMoe•1h ago
From the docs, "It is strictly recommended for personal, non-production use."

Wow what a 180 from just a year ago when their blog said, "For companies that handle sensitive information, deploying open-source scheduling software on-premises can offer an extra layer of security. Unlike cloud services controlled by external vendors, on-prem installations let teams maintain full ownership of their infrastructure. " ¹

I just cannot trust a company that does a bait and switch like this.

¹ https://cal.com/blog/open-source-scheduling-empower-your-tea...

Ethee•1h ago
I think this is less a bait and switch and more just a legal liability shield. They're not saying you 'cant' use it that way. They just don't recommend you do, and they won't support you at all for doing so. Which I think is completely fair. Also, these two things aren't in contradiction. Deploying on prem does offer more security, but then it's up to you to use it correctly.
loa_in_•1h ago
It being open source also allows you to actually have a read of the software and guarantee things yourself, which is the harder better path anyway.
sreekanth850•53m ago
I still remember when they launched here. "Opensource Alternate to Calendly" was their post title.
fnoef•48m ago
What do you want, it’s hard to resist VC money and “the enterprise offering”
swyx•1h ago
are there notable open source forks or open source cal competitors that go for the "just keep it simple" vibe?
ezekg•56m ago
Thunderbird showed up in the last thread: https://github.com/thunderbird/appointment
OsrsNeedsf2P•24m ago
Wait, I didn't even realize Cal.diy is owned by Cal.com. It seems like they're trying to get ahead of the open source community forking by doing this themselves
_ache_•2m ago
I just installed calrs lately. It rock's. The only down side is it forces me to activate STARTTLS. Young but very promising yet, actually, I don't know what I would like more than that.

I also replaced radical by rustical and I gain push update for free.

https://cal.rs/ and https://github.com/lennart-k/rustical

And if you wanna try it out. https://cal.ache.one/u/ache

The Vercel breach: OAuth attack exposes risk in platform environment variables

https://www.trendmicro.com/en_us/research/26/d/vercel-breach-oauth-supply-chain.html
171•queenelvis•3h ago•70 comments

Britannica11.org – a structured edition of the 1911 Encyclopædia Britannica

https://britannica11.org/
128•ahaspel•3h ago•67 comments

Cal.diy: open-source community edition of cal.com

https://github.com/calcom/cal.diy
79•petecooper•2h ago•15 comments

Framework Laptop 13 Pro

https://frame.work/laptop13pro
497•Trollmann•2h ago•290 comments

10 years: Stephen's Sausage Roll still one of the most influential puzzle games

https://thinkygames.com/features/10-years-of-grilling-stephens-sausage-roll-remains-one-of-the-mo...
29•tobr•3d ago•5 comments

Laws of Software Engineering

https://lawsofsoftwareengineering.com
715•milanm081•9h ago•360 comments

A Periodic Map of Cheese

https://cheesemap.netlify.app/
116•sfrechtling•4h ago•57 comments

Edit store price tags using Flipper Zero

https://github.com/i12bp8/TagTinker
211•trueduke•2d ago•217 comments

Fusion Power Plant Simulator

https://www.fusionenergybase.com/fusion-power-plant-simulator
120•sam•6h ago•61 comments

Show HN: GoModel – an open-source AI gateway in Go

https://github.com/ENTERPILOT/GOModel/
135•santiago-pl•6h ago•50 comments

Theseus, a Static Windows Emulator

https://neugierig.org/software/blog/2026/04/theseus.html
33•zdw•1d ago•3 comments

My practitioner view of program analysis

https://sawyer.dev/posts/practitioner-program-analysis/
9•evakhoury•1d ago•0 comments

Trellis AI (YC W24) Is hiring engineers to build self-improving agents

https://www.ycombinator.com/companies/trellis-ai/jobs/SvzJaTH-member-of-technical-staff-product-e...
1•macklinkachorn•3h ago

Running a Minecraft Server and More on a 1960s Univac Computer

https://farlow.dev/2026/04/17/running-a-minecraft-server-and-more-on-a-1960s-univac-computer
157•brilee•3d ago•26 comments

Show HN: VidStudio, a browser based video editor that doesn't upload your files

https://vidstudio.app/video-editor
212•kolx•8h ago•73 comments

Modern Front end Complexity: essential or accidental?

https://binaryigor.com/modern-frontend-complexity.html
44•gsky•2d ago•28 comments

Anthropic says OpenClaw-style Claude CLI usage is allowed again

https://docs.openclaw.ai/providers/anthropic
456•jmsflknr•16h ago•252 comments

A type-safe, realtime collaborative Graph Database in a CRDT

https://codemix.com/graph
130•phpnode•10h ago•35 comments

Kasane: New drop-in Kakoune front end with GPU rendering and WASM Plugins

https://github.com/Yus314/kasane
35•nsagent•4h ago•4 comments

Ibuilt a tiny Unix‑like 'OS' with shell and filesystem for Arduino UNO (2KB RAM)

https://github.com/Arc1011/KernelUNO
41•Arc1011•3h ago•7 comments

MNT Reform is an open hardware laptop, designed and assembled in Germany

http://mnt.stanleylieber.com/reform/
248•speckx•1d ago•91 comments

Meta capturing employee mouse movements, keystrokes for AI training data

https://economictimes.indiatimes.com/tech/technology/meta-to-start-capturing-employee-mouse-movem...
115•dlx•2h ago•62 comments

Show HN: Ctx – a /resume that works across Claude Code and Codex

https://github.com/dchu917/ctx
41•dchu17•1d ago•16 comments

Clojure: Transducers

https://clojure.org/reference/transducers
119•tosh•2d ago•48 comments

Show HN: Mediator.ai – Using Nash bargaining and LLMs to systematize fairness

https://mediator.ai/
138•sanity•1d ago•68 comments

Colorado River disappeared record for 5M years: now we know where it was

https://phys.org/news/2026-04-colorado-river-geological-million-years.html
32•wglb•1d ago•4 comments

Tim Cook's Impeccable Timing

https://stratechery.com/2026/tim-cooks-impeccable-timing/
263•hasheddan•9h ago•352 comments

Show HN: Daemons – we pivoted from building agents to cleaning up after them

https://charlielabs.ai/
43•rileyt•4h ago•24 comments

Anthropic takes $5B from Amazon and pledges $100B in cloud spending in return

https://techcrunch.com/2026/04/20/anthropic-takes-5b-from-amazon-and-pledges-100b-in-cloud-spendi...
237•Brajeshwar•7h ago•245 comments

Slava's Monoid Zoo

https://factorcode.org/slava/monoids.html
58•luu•1d ago•8 comments