Rare Egg Spawn Timer with Browser Alert - Steal An Egg

When does the next rare egg spawn?

Watch a Rare-or-better nest. The moment it refills, press Seen now on its row. Add a row for each nest you are watching, up to eight. Enter how many seconds it takes you to run to the nest, and each row tells you when to leave. If you allow it, a browser notification fires when it is time to go.

How does it work?

next spawn = last spawn you marked + interval
leave at   = next spawn − run time to the nest

If the tab was closed for a while, the tool keeps adding the interval until the result is in the future, so it stays aligned with the server as long as the cycle was not interrupted. Server restarts and Admin Abuse resets re-seed the cycle — mark the next spawn you see and it re-aligns.

Why be early?

On a full server up to six other players race the same nest. Standing next to it with a bear trap ready when the countdown hits zero is worth more than any amount of Speed. The escape routine after the grab is in the stealing guide, and which nests are worth camping is in the all eggs list.

What if the cycle looks different from five minutes?

Measure it: mark a spawn, wait for the next, and note the seconds between them. Put that number in the interval box. If a patch changes the cycle for everyone, the biomes page will be updated — the tool itself does not need an update. Once the egg is home, the income calculator shows what it adds.