01
OpenMeter
Metering and Billing for AI, API and DevOps. Collect and aggregate millions of usage events in real-time and enable usage-based billing.
Health85
Shipping87
Score90
Confidence100
Stars2.2k
ModeSource-visible project
Subscription Billing
Alternatives to Flexprice
Compare healthier or more active tools in the same use case using ToolVitals public evidence.
Why compare
Signals behind this alternatives page
- Maintenance and shipping signals are strong.
- Health score: 92/100.
- Shipping score: 98/100.
Switching guide
Best alternatives by need
Verified open/source-visibleOpenMeter, FOSSBilling, Lago, AI Billing
Useful when portability and inspectability matter.
License unknown, source-visible signalsPaid Memberships Pro
Public source signals exist, but ToolVitals has not verified the license class.
Ranked alternatives
Best-fit subscription billing options
Active
02
FOSSBilling
Empower your hosting business with FOSSBilling, the free and open-source solution for efficient billing and client management.
Health90
Shipping90
Score92
Confidence96
Stars1.7k
ModeSource-visible project
03
Paid Memberships Pro
The Trusted Membership Platform That Grows with You: Restrict access to content and charge recurring subscriptions using Stripe, PayPal, and more. Fully open source. 100% GPL.
Health88
Shipping92
Score92
Confidence99
Stars527
ModeSource-visible project
04
Lago
Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
Health96
Shipping71
Score89
Confidence100
Stars10.3k
ModeSource-visible project
05
AI Billing
Billing layer for Vercel AI SDK applications.
Health81
Shipping78
Score85
Confidence100
Stars3
ModeLibrary / Framework
06
Autumn
Autumn is an open-source pricing & billing platform
Health77
Shipping69
Score80
Confidence100
Stars2.6k
ModeSource-visible project
07
PayKit
The billing framework for TypeScript. Code-first products, handles Stripe, webhooks, and usage state, runs in your app.
Health76
Shipping71
Score81
Confidence100
Stars1k
ModeSource-visible project
08
Ubilling
Open-source billing system for ISP and network service management.
Health80
Shipping72
Score82
Confidence94
Stars180
ModeSource-visible project
09
Billmora
Open-source billing management with recurring automation and provisioning.
Health72
Shipping83
Score81
Confidence89
Stars10
ModeSource-visible project
10
Kill Bill
Open-Source Subscription Billing & Payments Platform
Health78
Shipping61
Score78
Confidence100
Stars5.6k
ModeSource-visible project
11
BillRun
Open source billing and fraud detection system.
Health77
Shipping69
Score78
Confidence84
Stars127
ModeSource-visible project
12
Panelica
🧾 Open-source WHMCS alternative — self-hosted hosting billing & client portal. Laravel 13 + MySQL. Invoicing, domains, SSL, tickets, reseller, multi-language (30 locales), 15 themes. Free & MIT-licensed.
Health73
Shipping66
Score77
Confidence94
Stars25
ModeSource-visible project