A port is a lossy transformation, not a rewrite

A prompt written for Veo and the same prompt written for Seedance are not one text with different labels on it. They are different shapes over different capabilities, and moving between them costs something: Veo → Seedance loses native multi-speaker audio. Kling 15s → Veo 8s loses seven seconds. Sora 25s → Hailuo 10s loses fifteen. That delta is arithmetic over two capability rows, and nobody tells you before you pay for the generation.

The transpiler is free and needs no account. Paste a prompt, pick the model it was written for and the one you can actually run, and it comes back in the target's own grammar with the cost of the move listed beside it. What the target cannot render is taken out of the ported prompt rather than left in to be ignored — so the prompt and the loss report never contradict each other. Every lane also ships a worked example that costs nothing. Writing a port needs credits.