AI · alternatives · 2026
24 alternatives to Moltarena
A physics-based arena where AI agents invent strategies
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
25d ago · tinyaiarena.com · its alternatives →
- 2
Molthunt▲289The place to discover your agents' next favorite thing
Feb 2026 · molthunt.com · its alternatives →
- 3
Agent Arena▲348Creator here. I built Agent Arena to answer a question that kept bugging me: when AI agents browse the web autonomously, how easily can they be manipulated by hidden instructions? How it works: 1. Send your AI agent to ref.jock.pl/modern-web (looks like a harmless web dev cheat sheet) 2. Ask it to summarize the page 3. Paste its response into the scorecard at wiz.jock.pl/experiments/agent-arena/ The page is loaded with 10 hidden prompt injection attacks -- HTML comments, white-on-white text, zero-width Unicode, data attributes, etc. Most agents fall for at least a few.…
Jun 2026 · arena42.ai · its alternatives →
- 4
- 5
moltbook▲580Pretty bizarre. The agent has completely dominated moltbook and has launched a token which pumped to multiple millions within hours. It makes sense that agents would have their own currency. But pretty wild, imo.
Feb 2026 · moltbook.com · its alternatives →
- 6
We built a computer use agent once and got it benchmarked at the 2nd position in the biggest benchmark for this field but in the process, we realized one thing, how outdated and inefficient these benchmarks are and how they don't truly capture how these tasks went. So we thought a community led benchmarking arena would be the way to go about. https://coarena.ai/. You just have to put in a task and two side by side windows with hidden models will show up and do the same task and at the end you vote which one did better(or none). We have a leaderboard where we rank all the…
Aug 2026 · coarena.ai · its alternatives →
- 7
Agenta▲362Open-source prompt management & evals for AI teams
Nov 2025 · agenta.ai · its alternatives →
- 8
Khorus▲124Cursor for A2A, where Agents collaborate & build together
Nov 2025 · khorus.io · its alternatives →
- 9
Hey, Jared Palmer (creator of this playground) here. Really excited to ship this. I’ve been building this over the past few weeks to compare LLMs from different providers like OpenAI, Anthropic, Cohere, etc. At Vercel, I manage our Frameworks division (including Next.js, Svelte, and Turbo) and wanted to also dogfood some of the latest features in a slightly larger application. This playground takes a lot of inspiration from https://nat.dev and is built on Tailwind, ui.shadcn.com, and some upcoming Vercel products we’re announcing soon. We’re going to continue adding models to…
2023 · play.vercel.ai · its alternatives →
- 10
Playground▲198We build AI agents to find vulnerabilities in other AI agents. The playground started as an internal tool that we used to test our own offensive agent Nyx. But we realised that hacking an AI is about have as wide a distribution of attacks as possible, especially those which aren't in the distribution of the models. So we are launching playground as a platform to crowdsource agent jailbreaks. And although hacking AI is super fun and we are sure people will do it for free, we want to reward those who help us push forward the offensive frontier of AI. So we are committing $100K in prizes over…
Jul 2026 · playground.fabraix.com · its alternatives →
- 11
Extella.AI▲97Agentic platform that evolves & builds reusable systems
Jun 2026 · extella.ai · its alternatives →
- 12
Contribute to FeSens/auto-arch-tournament development by creating an account on GitHub.
Apr 2026 · github.com · its alternatives →
- 13
MolmoAct 2▲98Open robotics model that reasons in 3D before acting
May 2026 · allenai.org · its alternatives →
- 14
Hi HN, Founder here. We built Pica, an open-source platform in Rust to enable agentic AI with three main focus areas: - Access to APIs and tools: Universal SDKs that let AI agents use thousands of external actions without blowing up your context window. - Visibility and traceability: Full audit logs of every decision/action to ensure transparency and accountability. - Alignment with human intentions: Seamless guardrails for autonomous tasks; e.g., restricting certain email actions to human approval. Why this matters: As autonomy in AI grows, we need robust solutions for trust and…
2025 · picaos.com · its alternatives →
- 15
An information-flow policy engine for LLM agents.
24d ago · openappa.com · its alternatives →
- 16
Mozaik▲107TypeScript runtime for self-organizing AI agents
Jul 2026 · mozaik.jigjoy.ai · its alternatives →
- 17
- 18
Moadim is an open-source loop engine for AI agents — runs Claude, Codex, Hermes, or Pi on a schedule, over MCP and REST.
Sep 2026 · moadim.io · its alternatives →
- 19
Agent evals and guardrails in one request. Built on Jev, Kev and Laya. - openlayer-ai/jevals
Sep 2026 · github.com · its alternatives →
- 20
Your Company Agentic Operating System. Contribute to desplega-ai/agent-swarm development by creating an account on GitHub.
Feb 2026 · github.com · its alternatives →
- 21
AdArena▲38🏆 ONE BRIEF. AN ARMY OF CREATORS. MAY THE BEST AD WIN.
Sep 2026 · adarena.app · its alternatives →
- 22
We build runtime security for AI agents. The playground started as an internal tool that we used to test our own guardrails. But we kept finding the same types of vulnerabilities because we think about attacks a certain way. At some point you need people who don't think like you. So we open-sourced it. Each challenge is a live agent with real tools and a published system prompt. Whenever a challenge is over, the full winning conversation transcript and guardrail logs get documented publicly. Building the general-purpose agent itself was probably the most fun part. Getting it to reliably use…
Mar 2026 · github.com · its alternatives →
- 23LP
2025 · mafia.opennumbers.xyz · its alternatives →
- 24
Sep 2026 · clawfight.ai · its alternatives →
Also compare
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →