You can become a member by starting your free trial here.
When opening the IDAGIO app for the first time you are invited to explore for 24 hours without any commitment.
After that you can activate a 14 day test subscription and if you enjoy the experience, you don't have to do anything - your membership will automatically continue for as long as you choose to remain a member. 

IDAGIO is available from $/€9.99 per month, but the prices may vary slightly depending on country and currency.
If you wish to cancel for free within the 14 day test subscription, you can do so any time within this period without being charged a thing.

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