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Your specific task is calculate habitable zone boundaries from star luminosity. Open the page, drop your input, get the result — typically under a second.
Your goal is calculate how long light takes to travel any distance. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. Hab Zone focuses on calculate habitable zone boundaries from star luminosity; Light Time focuses on calculate how long light takes to travel any distance. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both Hab Zone and Light Time work without signup. We only ask for an email if you decide to subscribe to a paid plan.