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Personal finance app where I can mark transactions as “reviewed”? 
I had exactly the same need and I ended up using BillGuard and I like it.  At the end of the day, it sends an alert where I need to review all the transactions - takes hardly 5seconds and I am on top of all transactions.  From the last 1yr I have found 1 fraudulent and 2 duplicate charge using billguard. Didn't really save a ton of money but its useful to understand how you use your credit card. Don't work for or promoting the app, its just useful.