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Mở ngay →Compose prompts following the 7-rule structure — role, context, task, format, constraints, examples, reasoning. Templates included.
Good prompts → good output. This tool walks you through the proven structure: Role + Context + Task + Format + Constraints + Examples + (Reasoning).
Developers using ChatGPT/Claude/Gemini daily, AI engineers building RAG/agents, anyone paying LLM API and wanting quick metrics.
No. The tool runs 100% in your browser — no HTTP requests to TopDev servers or any AI provider. You can disconnect from the internet to verify.
Yes. All TopDev tools are free, no signup required, no usage limits.
Accurate token count for ChatGPT, Claude, Gemini, Llama. Live input cost.
Estimate monthly/yearly LLM API spend. Compare which model is cheapest.
NEWRender markdown live — paste ChatGPT/Claude output. GFM, tables, code blocks.
NEWGPT-5, Claude 4.7, Gemini 2.5, Llama 4, DeepSeek — context, pricing, modality (2026).