AI & LLM Tools

AI-era utilities: token and cost estimators, prompt tooling, secret scanners, and schema generators - all fully in-browser.

10 tools in this category

  • Prompt Token & Cost Estimator

    Count tokens for any prompt and estimate the API cost per call with September 2026 models — GPT-5.6, Claude 5, Gemini 3.8, DeepSeek V4.

  • AI Cost Calculator & Price Board

    Estimate your monthly LLM bill from tokens and call volume, with a side-by-side comparative ROI matrix for major models.

  • .env & Code Secret Scanner

    Paste a .env file or code snippet and find leaked API keys, tokens, and passwords - masked previews, remediation advice, zero network calls.

  • API Key Format Validator

    Identify the provider and validate the format of any API key entirely offline - OpenAI, Anthropic, AWS, GitHub, Stripe and more.

  • Prompt Template Renderer

    Fill {{variables}} in any prompt template, preview the final prompt, and see its token count before sending.

  • System Prompt / AGENTS.md Builder

    Compose a production system prompt from guided blocks - role, mission, rules, output format, verification - and export AGENTS.md-style files.

  • JSON Schema Generator (Strict)

    Turn sample JSON into an LLM strict-mode JSON Schema - every field required, additionalProperties locked.

  • cURL → fetch / SDK Converter

    Convert cURL commands into fetch code and typed OpenAI/Anthropic SDK calls - entirely in your browser.

  • Prompt Diff & Comparer

    Compare two prompt versions line by line with a token and cost delta - see exactly what changed.

  • Webhook Signature Verifier

    Verify Stripe-style HMAC-SHA256 webhook signatures locally with Web Crypto and inspect payloads safely.