I know of apps like Acorns and Grain, however, I am curious if you prefer something else or even one of the apps previously listed.
- This may not be exactly what you're looking for, but this is my recommendation for investing small amounts of $ - either 1) use an app like you mentioned to track spare change or 2) choose a small amount of $ to invest per week. Then, set up a recurring buy for a cryptocurrency of your choice on Coinbase for that amount and check back in a year or two :)
- Robinhood is available for both iOS and Android. My friends and I have used Robinhood to invest small dollar amounts and test the waters for new investment ideas. Since Robinhood doesn't have fees, you can still trade spare change without worrying about losing money on every transaction.