Labs

Free AI labs

Small in-browser utilities you can search for and reuse. Each one estimates or checks something, then sends you into the matching lesson. Nothing is uploaded.

• Token counter · Context windows — Paste text to estimate tokens, see how much of an 8k–1M context window you used, and learn why token counts are not word counts.
• Voice consent checker · Voice safety — Answer six consent, rights, and disclosure questions. Get a go / no-go before you upload a voice sample to any cloning tool.
• Embedding similarity · Search & RAG — Compare two texts with a bag-of-words cosine score. See why embeddings beat keywords, then practice in the embeddings lesson.
• Local VRAM estimator · Local models — Pick a model size and quantization to estimate VRAM before you download weights. Then compare local stacks like Ollama and MLC LLM.
• Prompt-injection sandbox · Security — Paste a user message and see which phrases look like prompt injection. Educational pattern check — not an attack tool.
• Citation checker · Research — Paste a claim and a source passage. See which numbers and quotes actually appear before you trust an AI summary.
• Excel formula verifier · Spreadsheets — Paste an Excel or Sheets formula. Get a checklist for absolute refs, blanks, and a tiny sample grid before you fill a column.
• Training-data explainer · Provenance — Walk a hit / miss / detector decision tree. Learn what Have I Been Trained? can prove — and what it cannot.