Alternatives
Products that do what AltiVerse: What If SIM, see different decisions affect an environment does
- 1
- 2
- 3
- 4
- 5SA
Hey HN, Waleed here. We're building Sim (https://sim.ai/), an open-source visual editor to build agentic workflows. Repo here: https://github.com/simstudioai/sim/. Docs here: https://docs.sim.ai. You can run Sim locally using Docker, with no execution limits or other restrictions. We started building Sim almost a year ago after repeatedly troubleshooting why our agents failed in production. Code-first frameworks felt hard to debug because of implicit control flow, and workflow platforms added more overhead than they removed. We wanted…
Dec 2025 · github.com
- 6AT
Hi HN community! We want to share AI-town, a deployable starter kit for building and customizing your own version of AI simulation - a virtual town where AI characters live, chat and socialize. Inspired by great work from the Stanford Generative Agent paper (https://arxiv.org/abs/2304.03442). A few features: - Includes a convex.dev backed server-side game engine that handles global state - Multiplayer ready. Deployment ready - 100% Typescript - Easily customizable. You can fork it, change character memories, add new sprites/tiles and you have a custom AI simulation…
2023 · github.com
- 7TT
Simulate anything on a map from a text prompt -- and conduct risk analysis against LiveUA map's global realtime data points from social media and news sources. I trained a GPT-2-size model on historical incident data used to predict things that will go wrong. As historian Benjamin Breen mentions, the leading language models are good historians, so the application will simulate historical events pretty well also. I include a Multi-Agent RL Urban Mobility model in progress displayed on the map as small white cubes representing traffic and pedestrians. Around SF, it uses real census data and…
2025 · mused.com
- 8
- 9
- 10AS
Hi HN, I’m a former C++ dev turned Product Manager. I’ve noticed many engineers struggle with the "politics" side of things when they become Leads. To help with this, I’m building a text-based simulator. It is NOT an AI chatbot. It is a hand-crafted, branching narrative (logic tree) based on real experiences. I just launched the first scenario: "The Backchannel VP." The Setup: Your VP Engineering is bypassing you and giving tasks directly to your juniors, causing chaos. Your Goal: Stop the backchanneling without getting fired. It’s a short, specific puzzle. I’d love to know if you think the…
Jan 2026 · apmcommunication.com
- 11SM
Hi HN, we are building SimBricks, an open-source simulation framework for heterogeneous systems, especially with custom hardware. SimBricks modularly combines existing simulators for machines, networks, and hardware, allowing you to build, test, and evaluate intricate complete systems in a virtual environment. Head over to the SimBricks website (https://simbricks.github.io/, also has a quick demo video) to learn more. We have pre-built docker images, and you can even immediately play around on codespaces. Concrete use-cases: - Evaluate HW accelerators, from early design with…
2024 · simbricks.github.io
- 12
- 13
- 14
- 15
- 16DA
Write a task in plain English. An AI agent runs it on a simulator on your Mac and tells you if a real user could complete it. Save the successful run as a regression check you can replay later.
23d ago · app.deltix.ai
- 17CA
Hey HN, just wanted to share a fun, vibe-coded Friday night experiment: a little playground for writing cellular automata in a subset of Rust, which is then compiled into WGSL. Since it lets you dynamically change parameters while the simulation is running via a TUI, it's easy to discover weird behaviors without remembering how you got there. If you press "s", it will save the complete history to a JSON file (a timeline of the parameters that were changed at given ticks), so you can replay it and regenerate the discovery. You can pan/zoom, and while the main simulation window is in…
Feb 2026 · github.com
- 18VM
Just sharing this project [0] I've worked on a while ago, it's not that interesting but I was proud of making it. It has a CLI and a GUI that is done with Dear ImGui and includes an instruction editor, memory and registers viewer, and a canvas that is manipulated with an extra instruction made specifically for the GUI! This is not my first attempt at a virtual machine implementation, I've done the popular LC-3 VM before [1], check it out if you're interested to see Rust code rather than C++ ;) [0]: https://github.com/faresbakhit/vole-sim [1]:…
2025 · faresbakhit.github.io
- 19FS
I wanted to test mobile apps in plain English instead of relying on brittle selectors like XPath or accessibility IDs. With a vision-based agent, that part actually works well. It can look at the screen, understand intent, and perform actions across Android and iOS. The bigger problem showed up around how tests are defined and maintained. When test flows are kept outside the codebase (written manually or generated from PRDs), they quickly go out of sync with the app. Keeping them updated becomes a lot of effort, and they lose reliability over time. I then tried generating tests directly from…
Apr 2026 · github.com
- 20
- 21
Ask “What If?” and explore alternate timelines instantly
Mar 2026 · altertimeline.com
- 22
Simulate your life choices and map out your future.
Jun 2026 · simu-life-quest.lovable.app
- 23
- 24SA
Games in general and multiplayer games have been a big part of what my friends do together (not just digital; sports, board + card games) And it moved to online games as more of us moved to other places and party games became our go-to Love jackbox and gaming couch (that I discovered here on HN) I saw the vibej.am for this year and I couldn't think of a good enough idea till about the 3rd week but here I am! This is a game made for me and my friends and it's also very inspired by what I thought the PS3 6-axis controller would be when I first heart about it Thanks for reading this and I hope…
Apr 2026 · simdrive.xyz
Ranked by how close each launch is in meaning, then by votes. Refine with a description →