Three days ago, I shared Finbley, my lightweight earning/spending tracker. The most requested feature was shared accounts — for couples, roommates, or small teams tracking expenses together.

I just shipped that update.

What's new:

- Shared accounts with multiple members

- Role-based permissions (Owner, Admin, Member)

- Invite system via email

- Activity history showing who made each edit

- Clear UI for switching between personal and shared accounts

Now multiple people can view/update the same finances without sharing logins.

How it works internally:

- New account_members join table in SQLAlchemy

- Simple RBAC layer (endpoint permission checks)

- JWT tokens now include current_account + role context

- Transaction actions logged with the acting user

- Background summarization runs per account instead of per user

Still trying to keep it lightweight while making shared money tracking practical.

Questions for the HN community:

- Is the RBAC model (Owner/Admin/Member) too simple or too complex?

- Would you expect more granular permissions (e.g., read-only access)?

- How do you handle shared finances with existing tools?

- Any technical or UX pitfalls I should watch out for?

Try it here: https://www.finbley.com

Thanks to everyone who interacted with the first post!