YenPocket Support
YenPocket (iOS) · Last updated: September 20, 2026
Need Help with YenPocket?
If you encounter an issue, have a question about exchange rates, or need assistance with your in-app purchase, our support team replies directly by email within 24 to 48 hours.
What YenPocket Does
YenPocket is an offline-first currency conversion utility designed for international travelers and residents navigating Japan. The app focuses on zero-lag calculations and reliable offline use:
Converts Japanese Yen against USD, EUR, GBP, AUD, CAD, SGD, and 25+ other currencies using cached rates.
Calculates 10% standard goods tax, 8% food and beverage tax, and duty-free shopping thresholds.
Scans price tags and menus live on-device using Apple VisionKit text recognition without saving photos.
Refreshes daily mid-market rates from the European Central Bank via Frankfurter whenever connected to the internet.
Frequently Asked Questions & Troubleshooting
How do I restore my Pro purchase on a new or reset device?
Open YenPocket, tap the Settings icon in the top corner, and tap “Restore Purchases.” Apple will verify your App Store receipt with RevenueCat and re-enable your Pro features without charging you again.
Does YenPocket work underground or without cellular roaming?
Yes. All calculations, tax-free math, the shopping basket, and the camera price scanner run entirely on your phone. The app ships with a rate table and caches the latest fetched rates locally so you can use it in subway stations, basements, and on airplanes.
Why does the app rate slightly differ from my credit card transaction?
YenPocket displays the official daily reference mid-market rate published by the European Central Bank (via Frankfurter). Most credit card networks (Visa, Mastercard, Amex) and ATM operators add their own foreign exchange conversion markup (typically 1.5% to 3.0%).
Are my scanned camera images saved or uploaded?
No. The Pro scanner uses Apple's on-device VisionKit engine to detect numerals in the camera feed. Video frames are analyzed in real time, never written to disk, and never transmitted over the internet.
Contact & Inquiries
For technical support, bug reports, feature requests, or questions:
You can also submit inquiries via our website contact form, or review our YenPocket Privacy Policy.