Just use the website

Bought the iphone version. Frequently it returns "there is no path" as an error when checking for train times. Example : Shibuya to Shinagawa - an easy route on the Yamanote line. Odawara to Shinjuku, another simple route ). Sometimes it wont even recognise a station such as "Shinagawa" and will force you to enter the wrong station name. Restarting the app, changing from wi-fi to 3G or vice versa makes no difference. Sometimes it pauses for over a minute then crashes. This misbehaviour can last for literally hours. It does actually work from time to time but overall I find it so unreliable it is unusable.

The website version always works, is free, is perfectly usable from iPhone Safari, and as you still need an internet connection to use the iphone app anyway, it is no less portable. I wish I had not wasted my money. I expect the developers will fix the issues at some point, but my 350 yen "purchase" only lasts for 30 days so I am unlikely to be a beneficiary.

Save your money, use the website.

Tokyo Mac about HYPERDIA by VOICE, v1.3.0