Sim
AI
agent workflow builder
SHOW HN2025
How HN took it
4 positive, 16 neutral or asking, 0 mixed, 3 critical, out of 23 comments about the project. Thread score +0.09.
Idea: 1 for, 0 againstPricing: 1 for, 0 againstPerformance: 0 for, 1 againstDocs: 0 for, 1 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
Running locally with no execution limits
From 1 comment
> You can run Sim locally using Docker, with no execution limits or other restrictions. This is big. Thank you.
popalchemist on HN
Apache 2.0 licensing versus n8n's source-available license
From 1 comment
n8n uses a "Sustainable Use License"—source available, but not OSI-approved open source. This means you can only use it for internal business purposes or non-commercial use. Sim…
waleedlatif1 on HN
Objections
Copilot requires Azure OpenAI rather than custom LLM endpoints
From 2 comments
This looks really cool, but not being able to use my own LLM endpoints for the Copilot is an instant turn-off.
rcarmo on HNYou actually can, if you self-host there are environment variables to control what models are available to the copilot but it’s tuned to Azure for the time being. We can work on…
waleedlatif1 on HN
High 12GB minimum RAM for self-hosting
From 2 comments
Looks interesting. The 12GB minimum RAM requirements seem quite steep though. Why so much?
spflueger on HNits a conservative estimate, but primarily because there's a socket server that runs alongside the main container, so you never have to manually save because changes are…
waleedlatif1 on HN
Docs and README gifs hard to follow
From 1 comment
A bit of feedback, the readme gifs are a little too fast, it's hard to tell what exactly is happening.
SCUSKU on HN
Requests
Dark mode on the main site
From 1 comment
Also on the topic of UX. Dark mode on main site to prevent the blinding?
pylotlight on HN
Better documentation for custom LLM endpoints
From 1 comment
Azure is just fine, as long as it's documented someplace. I'll take a look, although I also couldn't find prebuilt Docker images referenced in the compose.local file (I will look…
rcarmo on HN
Questions
How loops and nested loops are handled
From 2 comments
How does it deal with loops? I’ve often see workflow builders struggle at that?
brene on HNand specifically nested loops. if you're spinning up full runtime copies for each loop, you're gonna have a hard time
Natfan on HN
Whether it can use LangGraph agents or MCP
From 1 comment
This looks really cool for DIYing workflows, especially since you seem to have a very useful selection of tools! Did you build your own agent engine? Why not LangGraph? Say I was…
solarkraft on HN
Business strategy and monetization
From 1 comment
Edit: I checked out your materials, I see. Copilot; smart - one could probably do this themselves with the self hosted, and those that would do this aren’t good customers for…
threecheese on HN
Alternatives named
n8n
From 1 comment
I wonder how the free open-source in this stacks up to the free open-source in n8n.
hbarka on HN
Node-RED
From 1 comment
How does this compare to say, Node Red?
saubeidl on HN
LangGraph
From 1 comment
This looks really cool for DIYing workflows, especially since you seem to have a very useful selection of tools! Did you build your own agent engine? Why not LangGraph? Say I was…
solarkraft on HN
Activepieces
From 1 comment
This is the other major project in this space, although there are many, so finding the differences can be challenging. https://www.activepieces.com |…
pylotlight on HN
Windmill
From 1 comment
I really like windmill.dev which should support your scenario just fine
grantith on HN