ChartMogul
ChartMogul is the only tool here that connects to Maxio directly, so you can keep Maxio for billing and get better metrics without a migration.
Here's the option most Maxio-alternative searches miss: ChartMogul lists both Maxio Advanced Billing and Maxio Core among its 25+ billing integrations. You don't have to rip out billing or rev-rec to escape the metrics dashboard. Its cohort analysis and segmentation are the deepest in the category, and the free tier covers you to $120K ARR.
It's an analytics tool only, so no invoicing and no rev-rec, and it isn't instant: ChartMogul's help docs describe a roughly 10-minute processing window on real-time sources. Capterra reviewers (4.7/5, 44 reviews) praise the UI but mention sync discrepancies against billing systems, and some long-term customers report repeated price increases.