The Postman for AI — prompt registry + multi-provider router. Free tools for engineers who ship prompts.https://verna.one/en-ushttps://verna.one/prompt-portability-linter/https://verna.one/prompt-portability-linter/Paste a prompt, get an instant portability score and every provider-lock-in issue — in your browser.Sun, 09 Aug 2026 00:00:00 GMThttps://verna.one/llm-cost-calculator/https://verna.one/llm-cost-calculator/Compare monthly LLM API cost across providers and see fallback + compression savings.Sun, 09 Aug 2026 00:00:00 GMThttps://verna.one/prompt-auditor/https://verna.one/prompt-auditor/A free copy-paste prompt that audits any LLM prompt for provider lock-in and token waste, then rewrites it to be model-agnostic.Sun, 09 Aug 2026 00:00:00 GMThttps://verna.one/fallback-chain-picker/https://verna.one/fallback-chain-picker/Design a resilient, cost-aware cross-provider fallback chain for any task.Sun, 09 Aug 2026 00:00:00 GMThttps://verna.one/token-waste-finder/https://verna.one/token-waste-finder/Find the input tokens you pay for on every call that add nothing — and cut them.Sun, 09 Aug 2026 00:00:00 GMT