As an independent developer you want to write code, not wrestle with admin tools. UseOneApp gives you just enough structure — projects, files, milestone invoices — without the bloat of enterprise software.
Projects without the bloat
Track tasks and scope per client, with a client portal for files and notes.
Invoice milestones cleanly
Bill per milestone with clean, sequential numbering handled for you.
Bring your own AI key
On the Pro plan, connect your own AI provider key — no markup, no lock-in.