Yeah your option is pretty much a bluetooth OBDII adapter and an app that logs. No clue what though. The Accessport is arguably Cobb's best (by far) product and they have alternatives pretty well beat as far as reliability and ease of use. The next closest thing I know of is SXTH's EK1, and the Lite is a $600 cheap plastic case holding a Raspberry Pi running their scanning software, while being much larger and not nearly as nice to use. Also only supports a handful of brands, mostly geared towards Korean ones but also Chevy and Mercedes Benz.
I will say that the price of a tune from a tuner bundled with an Accessport is generally pretty solid, and used ones show up occasionally for a lot less too. It's what I would recommend, but for just logs, I'm sure most apps will do fine