LLM Tools

Tools for working with large language models: token counters, cost calculators, prompt analyzers, and model comparison utilities. Every tool runs in your browser; pasted text never leaves your device.

All LLM Tools

• OpenAI Token Counter Count tokens for GPT-4o, GPT-4, GPT-3.5, o1, o3 with cost estimates.
• Claude Token Counter Count tokens for Claude 3.5 Sonnet, Opus, Haiku, and Claude 4.x.
• Gemini Token Counter Count tokens for Gemini 1.5 Pro, Flash, and Gemini 2.x.
• LLM API Cost Calculator Estimate per-call and monthly costs across LLM providers.
• Multi-Model Token Comparison Compare token counts and costs across GPT, Claude, Gemini, Llama side by side.
• Embedding Cost Calculator Estimate embedding API costs across providers and dimensions.
• System Prompt Analyzer Analyze prompt length, structure, and estimated cost per call.
• Prompt Token Cost Calculator Compare what one prompt costs across every major model. Cached vs uncached pricing.
• ChatGPT / Claude Chat Exporter Format a ChatGPT or Claude conversation export as Markdown, JSON, or HTML.
• OpenAI Pricing Calculator Estimate OpenAI API cost for any GPT model. Per-call + monthly projection.
• Claude Pricing Calculator Estimate Anthropic Claude API cost. Opus / Sonnet / Haiku with prompt caching.
• DeepSeek Token Counter Count tokens for DeepSeek-V3 and DeepSeek-R1 with cost estimates.
• OpenAI Function / Tool Schema Builder Build OpenAI function-calling JSON schemas visually. Parameter types, descriptions, required.
• Anthropic Tool Definition Builder Build Anthropic Claude tool definitions visually. JSON schema + description.
• Recursive Text Chunker (RAG) Split long text into overlapping chunks for embeddings. Configurable size and overlap.
• Embedding Model Comparison Table Compare every major embedding model: dimensions, max input, price, MTEB score.
• Cosine Similarity Calculator Compute cosine similarity between two vectors. Paste embedding vectors, get the score.
• RAG Cost Estimator Estimate end-to-end RAG cost: embedding + storage + retrieval + LLM completion.
• Vector DB Pricing Calculator Compare Pinecone / Qdrant / Weaviate / pgvector for your vector count and queries.
• JSON Extractor from LLM Output Pull JSON objects out of mixed-content LLM responses (with code fences, prose, retries).
• Code Block Extractor Extract every fenced code block from Markdown / LLM output. Group by language.
• Prompt PII Redactor Redact emails, phone numbers, names, addresses from text before sending to an LLM.
• Prompt Injection Scanner Scan user input for common prompt-injection patterns: instruction overrides, jailbreaks.
• GPT-5 Token Counter Token counter dedicated to GPT-5 / GPT-5 Mini / Nano. Uses o200k_base tokenizer.
• GPT-4o Token Counter Token counter dedicated to GPT-4o. Uses o200k_base tokenizer.
• GPT-3.5 Token Counter Token counter dedicated to GPT-3.5 Turbo. Uses cl100k_base tokenizer.
• Prompt Anonymizer — Replace Names & Entities Replace person names, company names, product codes with anonymous placeholders.
• Batch Prompt Formatter Apply one prompt template across CSV rows. Generates the batch as JSON for API calls.
• Prompt to Python Script Wrap a prompt into a runnable Python script (OpenAI / Anthropic SDK).
• Prompt to JavaScript / Node Script Wrap a prompt into a runnable Node script (OpenAI / Anthropic SDK).
• Prompt to cURL Wrap a prompt into a working cURL command for any major LLM API.
• Conversation Log Parser Parse any chat transcript into structured turns. Works with copy-pasted UIs.
• Multi-Shot to Single-Shot Converter Collapse a few-shot prompt with examples into one big single-shot prompt.
• Persona / Role Prompt Generator Build system prompts with expertise, tone, format, refusal patterns from a template.
• Negative Prompt Builder (Image Gen) Build negative prompts for Stable Diffusion / Midjourney / Flux from category tags.
• Output Schema → Prompt Instruction Convert a JSON Schema into the prompt text that asks an LLM to produce matching JSON.
• Prompt Diff — For Fine-Tuning Datasets Diff two prompts side-by-side. Highlight added/removed instructions, examples, tokens.
• Gemini Function Declaration Builder Build Gemini FunctionDeclaration JSON schemas. Compatible with Google AI Studio + Vertex.
• Embedding Dimension Calculator (Storage + Memory) Calculate storage and RAM for an embedding index by dimension and document count. Compare float32 vs int8 quantization.
• LLM Cost Comparator (Cross-Provider) Compare API cost across providers for the same input/output token count. OpenAI, Anthropic, Google, DeepSeek, Mistral.
• Tokens-per-Word Chart by Model Visualise how each tokenizer (GPT-4o, Claude, Gemini, Llama) splits English / multilingual text. Compare token efficiency.
• LLM Structured Output Validator (JSON Schema) Validate LLM responses against a JSON Schema. Catch missing fields, wrong types, format errors before sending to your application.