Roamclarity

What breaks when you travel on a data-only eSIM — checked country by country.

ROAMCLARITY / Travel tools

What does that cost in my currency?

A daily reference conversion, with room for your own fee assumptions. Not a live quote or a bank’s final charge.

JAPAN / AFTER HOURS · AI-generated editorial image

Amounts stay in this browser tab. Optional statistics count calculator actions only, without amounts, currencies or people counts.

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ROAMCLARITY / FIELDNOTES

Take your fieldnotes with you.

Create a key-based account to save this Japan plan across devices. No email or phone number required.

Sign in with account key

Privacy & account information

Device saves stay in this browser. Account saves store selected activities and the home-SIM setting in our Cloudflare database until you delete the account. Sessions expire after seven days. Your random account key is stored only as a hash on the server; keep your copy safe. We do not collect an email, name or phone number. Optional analytics store daily event totals by channel and language, without linking them to an account. Short-lived network digests are used for abuse control and are used in ten-minute windows, with expired records cleaned up on subsequent limited requests. Cloudflare may process request metadata to operate and secure the service. Contact [email protected] for questions. This service provides preparation guidance, not a guarantee that an app will accept you. Calculator amounts and inputs are processed in the browser and are not included in optional event counts.

Your choices, clearly explained.

Device saves stay in this browser. Account saves store selected activities and the home-SIM setting in our Cloudflare database until you delete the account. Sessions expire after seven days. Your random account key is stored only as a hash on the server; keep your copy safe. We do not collect an email, name or phone number. Optional analytics store daily event totals by channel and language, without linking them to an account. Short-lived network digests are used for abuse control and are used in ten-minute windows, with expired records cleaned up on subsequent limited requests. Cloudflare may process request metadata to operate and secure the service. Contact [email protected] for questions. This service provides preparation guidance, not a guarantee that an app will accept you. Calculator amounts and inputs are processed in the browser and are not included in optional event counts.