Free CRM for a small struggling non-profit with unlimited contacts?

Hi all,

I'm looking for a free CRM to use in our small non-profit helping women in need. We don't have much money to spare, non actually ATM.

We're starting to reach out for donations from big companies and organizations. I'm not entirely sure what our needs are but I think it needs to have:

1. Unlimited contacts.
2. Input for conversation summaries.
3. Basic tracking features.

What would be the best choice?

thx in advance for any help.

am also considering just using google sheets so to get starting asap.