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Show HN: CertArena – Free AI certification simulator (zero deps, native Node 24)

CertArena launched as a free AI certification simulator built with zero dependencies on native Node 24, offering 26 scenarios covering AI fundamentals, Amazon Bedrock, responsible AI, and AWS security decisions. The tool runs 120-minute timed exam conditions with option strikethrough, an item flag review matrix, and 700+ scaled scoring, plus Kokoro TTS speech synthesis that reads stems and distractors aloud with live visual tracking. Practice tracks span Microsoft Foundry, Google Cloud, Amazon SageMaker AI, Databricks, Claude, and OpenAI APIs, with instant objective-by-objective accuracy breakdowns.

read2 min views1 publishedSep 11, 2026
Show HN: CertArena – Free AI certification simulator (zero deps, native Node 24)
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Practice AI fundamentals, Amazon Bedrock, responsible AI, and security decisions on AWS.

26 scenarios· Kokoro audio

120-minute timed exam conditions, option strikethrough, item flag review matrix, and 700+ scaled scoring.

Production enterprise scenarios testing cost, latency, context caching, tool calling, and governance constraints.

Kokoro TTS speech synthesis reads stems and distractors aloud with live visual tracking for hands-free audio study.

Instant objective-by-objective accuracy breakdown to identify study gaps before booking your official exam.

Quick drills, timed practice, or untimed interview scenarios.

Practice AI concepts and lightweight applications with Microsoft Foundry, speech, vision, and information extraction.

Practice generative AI use cases, Google Cloud offerings, output quality, and responsible business adoption.

Practice data preparation, model development, deployment, and monitoring with Amazon SageMaker AI.

Practice RAG, Vector Search, evaluation, deployment, and governance for LLM applications on Databricks.

Practice agent architecture, tool use, context management, and reliability decisions with Claude.

Practice Claude API integration, tool calls, prompt caching, and streaming behavior.

Practice retrieval, deployment tradeoffs, privacy, and production operations for forward deployed engineering.

Practice structured outputs, retrieval, tool calling, and application design with OpenAI APIs.

No tracks match that search. Try a provider name or a broader topic.

Start with five scenarios or rehearse a larger set under a timer.

Read the explanation, check its source, and revisit the questions that need work.

Save topic results, keep a daily practice habit, and share a result when you want to.

Independent practice. Growing question banks. How our questions and scoring work →

Ranked by practice score, then set size, then speed. One best timed practice result per learner and track. These are unproctored practice scores.

| Rank | Candidate | Exam Track | Accuracy | Time | Streak |

|---|---|---|---|---|---| YOUR PRACTICE WORKSPACE

Your practice history, topic evaluations, and next steps.

Topic accuracy across your saved attempts. Small samples are a starting point for more practice.

Date Track Mode Accuracy Time Evaluation
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