Subscription billing work spans recurring payments, usage metering, invoicing, subscription management, and in some cases credits, top-ups, hosting billing, or publisher monetization. For June 2026, ToolVitals compares 26 listed Subscription Billing Tools using the supplied ToolVitals score, health score, shipping score, GitHub stars, status, openness_label, and license_label data.
This ranking includes open/source-visible tools only and orders them by ToolVitals score first, with GitHub stars used as the secondary popularity signal when scores tie. The labels are kept literal: every ranked tool here is marked OSI-approved OSS, with licenses including AGPL-3.0, Apache-2.0, GPL-3.0, MPL-2.0, MIT, and OSL-3.0.
Rankings
| Rank | Tool | Openness | License | Health | Shipping | GitHub Stars | Score | Status |
|---|---|---|---|---|---|---|---|---|
| 1 | Flexprice | OSI-approved OSS | AGPL-3.0 | 92 | 95 | 3584 | 95 | 🟢 Excellent |
| 2 | AI Billing | OSI-approved OSS | Apache-2.0 | 81 | 95 | 2 | 90 | 🟢 Excellent |
| 3 | Lago | OSI-approved OSS | AGPL-3.0 | 93 | 71 | 9927 | 88 | 🟢 Excellent |
| 4 | FOSSBilling | OSI-approved OSS | Apache-2.0 | 86 | 84 | 1602 | 88 | 🟢 Excellent |
| 5 | Autumn | OSI-approved OSS | Apache-2.0 | 77 | 69 | 2586 | 80 | 🟢 Excellent |
| 6 | lakasir | OSI-approved OSS | GPL-3.0 | 79 | 73 | 885 | 79 | 🟢 Good |
| 7 | Meteroid | OSI-approved OSS | AGPL-3.0 | 74 | 67 | 1124 | 78 | 🟢 Good |
| 8 | BillRun | OSI-approved OSS | AGPL-3.0 | 77 | 69 | 128 | 78 | 🟢 Good |
| 9 | Kill Bill | OSI-approved OSS | Apache-2.0 | 76 | 53 | 5586 | 75 | 🟢 Good |
| 10 | Ctrlpanel | OSI-approved OSS | MPL-2.0 | 71 | 46 | 507 | 71 | 🟢 Good |
| 11 | REMP | OSI-approved OSS | MIT | 66 | 60 | 138 | 70 | 🟢 Good |
| 12 | Faveo Invoicing | OSI-approved OSS | OSL-3.0 | 76 | 33 | 240 | 68 | 🟢 Good |
| 13 | Unimeter | OSI-approved OSS | MIT | 56 | 37 | 1 | 59 | 🟡 Fair |
| 14 | Subscribie | OSI-approved OSS | MPL-2.0 | 56 | 24 | 63 | 56 | 🟡 Fair |
| 15 | Usage Credits | OSI-approved OSS | MIT | 58 | 10 | 162 | 52 | 🟡 Fair |
| 16 | Subflow | OSI-approved OSS | AGPL-3.0 | 49 | 18 | 158 | 50 | 🟡 Fair |
| 17 | Lotus | OSI-approved OSS | MIT | 62 | 0 | 1828 | 46 | 🟡 Fair |
| 18 | dj-stripe | OSI-approved OSS | MIT | 43 | 17 | 1780 | 44 | 🟡 Fair |
| 19 | NovaBilling | OSI-approved OSS | AGPL-3.0 | 41 | 11 | 3 | 43 | 🟡 Fair |
| 20 | ValueCell | OSI-approved OSS | Apache-2.0 | 44 | 0 | 10808 | 42 | 🟡 Fair |
| 21 | Open Source Billing | OSI-approved OSS | GPL-3.0 | 36 | 0 | 770 | 37 | 🔴 Needs Attention |
| 22 | bframeLib | OSI-approved OSS | AGPL-3.0 | 31 | 0 | 10 | 31 | 🔴 Needs Attention |
| 23 | LibreBill | OSI-approved OSS | GPL-3.0 | 28 | 0 | 2 | 31 | 🔴 Needs Attention |
| 24 | Bill Flow | OSI-approved OSS | MIT | 24 | 0 | 0 | 28 | 🔴 Needs Attention |
| 25 | Bilify | OSI-approved OSS | MIT | 23 | 0 | 7 | 27 | 🔴 Needs Attention |
| 26 | ngbilling | OSI-approved OSS | Apache-2.0 | 3 | 0 | 33 | 20 | 🔴 Needs Attention |
Top 3 Highlights
Flexprice ranks first with a 95 ToolVitals score, a 95 shipping score, and a 92 health score. Its description covers usage-based pricing and billing, self-hosting, realtime usage metering, credits, top-ups, and feature access control, which makes it one of the broader developer-facing billing entries in this set. It is labeled OSI-approved OSS under AGPL-3.0 and has 3,584 GitHub stars.
AI Billing ranks second with a 90 ToolVitals score and a 95 shipping score. It is narrower than several other entries because its description focuses on being a billing layer for Vercel AI SDK applications. It is labeled OSI-approved OSS under Apache-2.0, but its 2 GitHub stars mean its ranking is driven by ToolVitals scoring rather than popularity.
Lago ranks third with an 88 ToolVitals score, a 93 health score, and 9,927 GitHub stars, the highest star count among the top five. Its description covers metering, usage-based billing, consumption tracking, subscription management, pricing iterations, payment orchestration, and revenue analytics. It is labeled OSI-approved OSS under AGPL-3.0.
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