I made an isaac autosplitter plugin for livesplit. It's in the resources page. It's been tested to work for 4 different people so far.

Here's a list of current issues:

¤ The starting delay is different when you start from the main menu compared to when you hold R. To work around this, you should always reset with R at least once when you start a run. ¤ It starts the timer 0.90 seconds before it should. You can account for this by setting your splits to start at -0.90 seconds. ¤ It starts the timer when you're selecting a save file before a run. Just ignore this, get ingame, reset the timer, and hold R. ¤ It splits at the end of the chest animation instead of the beginning. (pretty insignificant)

Updated it so you can set your starting character, and any time you hold R while on that character it resets the timer.

Fixed a few bugs just now: it was resetting when you went down a floor, and if you accidentally re-picked your starting character, it was resetting when you went back to the menu

I uploaded a new version. Krakenos fixed the bug where it was starting prematurely in the main menu, and I also removed the configuration options to set a starting character, because it's much simpler to just look at whether you're on your first split or not.

There is a bug where if you save+quit on B1 on your very first character, it will see that as a reset. Luckily it's not common that you'd have to do that.

I uploaded a new version. It's improved a lot; now you don't have to do the negative numbers thing, because it starts the timer the moment the in-game timer starts. It also has the option to split by floor, for single character runs/races. All known bugs are gone, except for the fraction of a second difference between splitting at the beginning vs end of the chest animation.

There was a bug! If you s+q on a floor past b1, it was splitting erroneously. That's fixed in the version I just uploaded.

I also added an option so if you're using floor splits, you can combine basement, caves, depths, and womb into one split each instead of two

The autosplitter got merged into the central Livesplit autosplitter list, so you don't even have to manually download it. You can just set your game to "The Binding of Isaac: Afterbirth" on the Edit Splits screen, then click Activate.

Greetings Hyphen-ated! First of all: Really nice autosplitter! Helps a lot!

Maybe its only me - but my autosplitter stopped working after the new booster pack today/yesterday. No matter if I import the file manually or take the autosplit-option at "edit splits". am i the only one or is that a major issue? looking forward to hear from you soon. Peace chaoskitty

@Chaoskittyx The autsplitter will break after every patch, but it should work now. Also, you should know that almost no-one reads these forums anymore. Your best best is to join the Isaac Discord server and ask there: https://discord.gg/JzbhWQb