nowfound

Alternatives

Products that do what AI Duel does

Send your AI agent to an LLM prompt-injection arena

  1. 1

    The first public arena for AI agents

    Jun 2026 · arena42.ai

  2. 2

    Prompt once. Compare multiple AI-built apps for free.

    Feb 2026 · arena.ai

  3. 3

    Get real-world tasks done with autonomous AI agents

    Jun 2026 · arena.ai

  4. 4

    Generative AI powered Master Agent Developer Framework

    2023

  5. 5
    AskCodi230

    Custom LLMs, without training. Use via openai compatible api

    Nov 2025 · askcodi.com

  6. 6

    Watch your AI agents debate and create in real-time

    2025

  7. 7AR

    Hi HN, I built this open-source LLM red teaming tool based on my experience scaling LLMs at a big co to millions of users... and seeing all the bad things people did. How it works: - Uses an unaligned model to create toxic inputs - Runs these inputs through your app using different techniques: raw, prompt injection, and a chain-of-thought jailbreak that tries to re-frame the request to trick the LLM. - Probes a bunch of other failure cases (e.g. will your customer support bot recommend a competitor? Does it think it can process a refund when it can't? Will it leak your user's address?) -…

    2024 · promptfoo.dev

  8. 8MM

    I built a March Madness bracket challenge for AI agents, not humans. The human prompts their agent with the URL, and the agent reads the API docs, registers itself, picks all 63 games, and submits a bracket autonomously. A leaderboard tracks which AI picks the best bracket through the tournament. The interesting design problem was building for an agent-first user. I came up with a solution where Agents who hit the homepage receive plain-text API instructions and Humans get the normal visual site. Early on I found most agents were trying to use Playwright to browse the site instead of just…

    Mar 2026 · bracketmadness.ai

  9. 9
    Retrace101

    Debug AI agents by replaying and forking runs

    Jul 2026 · retraceai.tech

  10. 10LA

    The initial idea for the game came during the final day of Game AI school in Cambridge. There, we had a Jam where we explored the idea of using LLMs as a game engine for fights. We then built a full web version in just a week. There is no need to register or pay to play. Test it out!

    2023 · llmarena.com

  11. 11
    deduce66

    A daily Wordle-like puzzle for AI agents

    Apr 2026

  12. 12

    The context manager and skills library for marketing teams

    Apr 2026 · promptr.ai

  13. 13PE

    Spelltest framework simulates conversations between AI ‘synthetic users' in an environment to test and refine LLM-based applications. It ensures your app converse with utmost accuracy and relevance. Post-chat, Spelltest assesses responses, providing qualitative and quantitative feedback on performance. Suitable for both chat and completion modes. When to use: - After modifying your prompt. - When your LLM provider updates. - As a CI step for you repo. All feedback and collaborations appreciated!

    2023 · github.com

  14. 14AM

    Hey HN, Michael and Scott here. We’re open-sourcing an interactive murder mystery featuring LLM-driven character agents. Solve the mystery by finding clues, taking notes, and interrogating agents. They all have distinct motives, personality, and can impact the game in different ways (attacking you, running away, etc). Try it out, it’s pretty fun! We’re also open-sourcing the framework that we used to make and refine the agents. The goal is to create an intuitive interface for storytellers to create, debug, and test game agents. We then take those game agents and expose an API beyond just…

    2023 · gron.games

  15. 15

    Build & run AI agents on free premium LLMs

    2025

  16. 16LA

    I used to play the Wikipedia Game in high school and had an idea for applying the same mechanic of clicking from concept to concept to LLMs. Will post another version that runs with an LLM entirely in the browser soon, but for now, please enjoy as long as my credits last... Warning: the LLM does not always cooperate

    Jan 2026 · llmgame.ai

  17. 17PA

    What PokerBattle.ai is a week-long live no-limit Texas Hold’em tournament where all players are top-tier reasoning LLMs. We’re testing how different models handle imperfect information and whether they can sustain consistent, math-driven poker without tool use or custom code. Why - In poker you can do well with basic math + consistent logic. - Superhuman poker AIs exist, but they rely on massive simulation/game-theory solvers and are effectively black boxes. - We want a rough, apples-to-apples comparison of LLM reasoning on poker decisions, and to collect public reasoning summaries that…

    Sep 2025 · pokerbattle.ai

  18. 18

    100 LLM attack prompts across 18 categories — $29

    Jul 2026 · payhip.com

  19. 19IB

    Excited to share a project I’ve been building for months! Would love to receive honest feedback :) My motivation: AI is clearly going to be the interface for data. But earlier attempts (text-to-SQL, etc.) fell short — they treated it like magic. The space has matured: teams now realize that AI + data needs structure, context, and rules. So I built a product to help teams deliver “chat with data” solutions fast with full control and observability (agent tracing, quality scores, etc) — am I wrong? The product allows you to connect any LLM to any data source with centralized context…

    Oct 2025 · github.com

  20. 20

    Chess.com for AI agents

    Jul 2026 · promptchess.com

  21. 21

    Put your Agent in the arena

    Jul 2026 · agentduel.app

  22. 22
    HackAI9

    Anyone can Hack with Just Prompt

    Dec 2025 · hackai.lol

  23. 23

    An AI gaming benchmark. Lmarena, but with games.

    Nov 2025

  24. 24

    The firewall for AI prompts. Drop-in security for LLM apps.

    Dec 2025 · promptguard.co

Ranked by how close each launch is in meaning, then by votes. Refine with a description →