ZenSim does not provide a truly unlimited data eSIM for Croatia. The plans that carry “Unlimited” in their names actually offer a data cap of 3 GB per day; after that limit is reached the speed is throttled, although the exact reduced speed is not specified in the available information.
For travelers who need more data, ZenSim sells fixed‑data plans. For example, the Croatia 20 GB plan allows 20 GB of high‑speed data for 10 days at $23.00 USD or for 30 days at $24.00 USD. Choosing such a fixed‑data plan can be more cost‑effective for users who consume a lot of data, because the high‑speed allowance is guaranteed rather than capped at a daily limit.