Subscription billing tools cover materially different jobs, from usage metering and pricing to invoicing, payments, hosting management, and license control. This July 2026 comparison uses ToolVitals data on project health, shipping activity, licensing, and GitHub popularity to help readers narrow the field.
The ranking includes only open or source-visible tools and orders them by ToolVitals score, with GitHub stars used as a secondary popularity signal. Every listed project is labeled OSI-approved OSS; the specific license_label is noted in each highlight.
Rankings
| Rank | Tool | Openness | License | Health | Shipping | GitHub Stars | Score | Status |
|---|---|---|---|---|---|---|---|---|
| 1 | Flexprice | OSI-approved OSS | AGPL-3.0 | 92 | 98 | 3595 | 96 | 🟢 Excellent |
| 2 | OpenMeter | OSI-approved OSS | Apache-2.0 | 85 | 87 | 2124 | 90 | 🟢 Excellent |
| 3 | FOSSBilling | OSI-approved OSS | Apache-2.0 | 86 | 84 | 1641 | 88 | 🟢 Excellent |
| 4 | Lago | OSI-approved OSS | AGPL-3.0 | 96 | 65 | 10226 | 87 | 🟢 Excellent |
| 5 | Billmora | OSI-approved OSS | MIT | 77 | 88 | 10 | 85 | 🟢 Excellent |
| 6 | Ubilling | OSI-approved OSS | GPL-2.0 | 76 | 78 | 183 | 82 | 🟢 Excellent |
| 7 | Kill Bill | OSI-approved OSS | Apache-2.0 | 81 | 67 | 5626 | 81 | 🟢 Excellent |
| 8 | Panelica | OSI-approved OSS | MIT | 77 | 72 | 24 | 81 | 🟢 Excellent |
| 9 | AI Billing | OSI-approved OSS | Apache-2.0 | 74 | 75 | 2 | 81 | 🟢 Excellent |
| 10 | PayKit | OSI-approved OSS | MIT | 71 | 77 | 1008 | 80 | 🟢 Excellent |
| 11 | Autumn | OSI-approved OSS | Apache-2.0 | 77 | 66 | 2614 | 79 | 🟢 Good |
| 12 | BillRun | OSI-approved OSS | AGPL-3.0 | 77 | 69 | 128 | 78 | 🟢 Good |
| 13 | Meteroid | OSI-approved OSS | AGPL-3.0 | 74 | 63 | 1151 | 77 | 🟢 Good |
| 14 | dj-stripe | OSI-approved OSS | MIT | 66 | 71 | 1786 | 76 | 🟢 Good |
| 15 | REMP | OSI-approved OSS | MIT | 66 | 61 | 137 | 71 | 🟢 Good |
| 16 | lakasir | OSI-approved OSS | GPL-3.0 | 67 | 58 | 888 | 70 | 🟢 Good |
| 17 | Ctrlpanel | OSI-approved OSS | MPL-2.0 | 57 | 42 | 509 | 63 | 🟢 Good |
| 18 | Subkit | OSI-approved OSS | MIT | 60 | 36 | 34 | 61 | 🟢 Good |
| 19 | Faveo Invoicing | OSI-approved OSS | OSL-3.0 | 63 | 10 | 240 | 56 | 🟡 Fair |
| 20 | Subscribie | OSI-approved OSS | MPL-2.0 | 53 | 20 | 63 | 53 | 🟡 Fair |
| 21 | Unimeter | OSI-approved OSS | MIT | 47 | 28 | 1 | 53 | 🟡 Fair |
| 22 | Usage Credits | OSI-approved OSS | MIT | 56 | 4 | 163 | 49 | 🟡 Fair |
| 23 | KeyGate | OSI-approved OSS | AGPL-3.0 | 44 | 20 | 24 | 49 | 🟡 Fair |
| 24 | NovaBilling | OSI-approved OSS | AGPL-3.0 | 36 | 0 | 4 | 37 | 🔴 Needs Attention |
| 25 | bframeLib | OSI-approved OSS | AGPL-3.0 | 31 | 0 | 10 | 31 | 🔴 Needs Attention |
| 26 | Bill Flow | OSI-approved OSS | MIT | 24 | 0 | 0 | 28 | 🔴 Needs Attention |
| 27 | Bilify | OSI-approved OSS | MIT | 23 | 0 | 7 | 27 | 🔴 Needs Attention |
| 28 | LibreBill | OSI-approved OSS | GPL-3.0 | 10 | 0 | 2 | 25 | 🔴 Needs Attention |
| 29 | ngbilling | OSI-approved OSS | Apache-2.0 | 3 | 0 | 33 | 20 | 🔴 Needs Attention |
Top 3 Highlights
Flexprice ranks first with a ToolVitals score of 96, the highest shipping score in the group at 98, and a health score of 92. It focuses on usage-based pricing, real-time metering, credits, top-ups, and feature access, with cloud and self-hosted options. It is OSI-approved OSS under AGPL-3.0 and has 3,595 GitHub stars.
OpenMeter places second with a ToolVitals score of 90, supported by an 85 health score and an 87 shipping score. Its scope is focused on real-time usage metering and billing for AI, API, and DevOps workloads. It is OSI-approved OSS under Apache-2.0 and has 2,124 GitHub stars.
FOSSBilling ranks third with a ToolVitals score of 88, an 86 health score, and an 84 shipping score. Unlike the usage-metering leaders, it is positioned around billing and client management for hosting businesses. It is OSI-approved OSS under Apache-2.0 and has 1,641 GitHub stars.
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