Watch the $$$ – FourChords Guitar Songbook Review

I downloaded free version and like it a lot. Installed it on two phones and an iPad. After a few weeks it reverted to playing only 30 second samples of songs prompting you to buy the VIP version. Trouble is they asked for $34.99 annual on one phone, the other was $39.99 and the iPad was $59.99. There were also equal differences on the monthly costs, one at $4.99, one at 7.99 and the other $9.99. Why different prices for same product? Cool app but I'd like an explanation as to the different rates before I buy.
Review by MarkAmaz on FourChords Guitar Songbook.