FluxBilling vs WHMCS
WHMCS has billed hosting customers since 2003 on PHP and MySQL. FluxBilling is a React 18 panel on Bun, Express and PostgreSQL, with billing, DCIM and IPAM in one schema. Plans start at €4.95/mo with every payment gateway included. This page is the side-by-side comparison — architecture, feature scope, plugin model, and what each one costs.
- Status
- Open beta
- Pricing
- €4.95 – €44.95/mo, flat per tier
- Stack
- React 18 SPA, Bun + Express, PostgreSQL
- Tenancy
- K3s pod + isolated database per tenant
- Plugins
- Visual flows stored as JSON in the database
- Status
- Shipped 2003
- Pricing
- Licence tiers + paid modules
- Stack
- Server-rendered PHP, MySQL
- Tenancy
- Single-tenant install
- Plugins
- PHP modules on the filesystem
FluxBilling is a hosting billing platform that competes with WHMCS, the PHP billing suite that has shipped since 2003. The practical difference is scope and architecture: WHMCS bills, and DCIM, IPAM and most provisioning targets arrive as separately licensed modules from its marketplace; FluxBilling keeps billing, invoicing and dunning, multi-currency, EU VAT with reverse-charge and OSS, DCIM with racks and U-positions, IPv4 and IPv6 IPAM, power and PDU monitoring, and every payment gateway inside one PostgreSQL schema behind a React 18 panel. Integrations are visual flows stored as JSON in the database rather than PHP modules uploaded to a filesystem, so a change is saved in the admin UI instead of deployed. Plans start at €4.95/mo and run to €44.95/mo, with a 14-day refund and no minimum term. A core WHMCS importer moves clients, services, invoices and transactions, and can be re-run.
FluxBilling and WHMCS, feature by feature.
Both platforms bill hosting customers, provision services and run a client portal. The differences sit in the stack, the plugin model, and what is included in the price.
| Capability | FluxBilling | WHMCS |
|---|---|---|
| Architecture | ||
| Admin + client interface | React 18 single-page app | Server-rendered PHP |
| Backend runtime | Bun + Express | PHP |
| Database | PostgreSQL | MySQL |
| Tenancy model | K3s pod + isolated database per tenant | Single-tenant install |
| Product status | Open beta | Shipped 2003 |
| Billing | ||
| Recurring invoicing, retries, dunning | ✓ | ✓ |
| Multi-currency | ✓ | ✓ |
| EU VAT: reverse-charge + OSS | ✓ | see vendor docs |
| Usage-based metering | ✓ | see vendor docs |
| Reseller portal | ✓ | see vendor docs |
| Every payment gateway in the base price | All included, all tiers | Core set, plus paid modules |
| Infrastructure & DCIM | ||
| DCIM: racks, U-positions, cabling | ✓ | — third-party module |
| IPAM (IPv4 + IPv6) | ✓ | — third-party module |
| Power & PDU monitoring | ✓ | — third-party module |
| Hypervisor / panel integrations | SolusVM 2 shipped; Virtualizor, Pterodactyl, cPanel / WHM available | Module marketplace |
| Planned, not shipped | Proxmox, Plesk, OpenStack | see vendor docs |
| Game-server control panel | Pterodactyl | see vendor docs |
| Plugin model | ||
| Integration format | Visual flows stored as JSON in the database | PHP modules on the filesystem |
| Visual flow builder | ✓ | — |
| Shipping an integration change | Edit and save in the admin UI | Upload module files to the server |
| One plugin shape across domains | payments, infrastructure, notifications | Separate module APIs per domain |
| Notification integrations | Telegram plugin | see vendor docs |
| Security & data | ||
| Encryption for stored settings and credentials | AES-256-GCM | see vendor docs |
| Isolated database per tenant | ✓ | — single install |
| Self-hosting | +€1,495 one-time | Self-hosted licence |
| Migration | ||
| WHMCS importer | Core feature — no add-on licence | n/a |
| Dry-run before writing | ✓ | n/a |
| Idempotent + resumable | ✓ | n/a |
| Commercial terms | ||
| Entry price | €4.95/mo (Lite, 10 clients, 5 bare metal) | see vendor docs |
| Top published tier | €44.95/mo (Business, unlimited clients, 150 bare metal) | see vendor docs |
| Extra bare-metal capacity | +€0.75/server/mo | see vendor docs |
| White-label | +€50/mo, available on every tier | see vendor docs |
| Refund window | 14 days, cancel any time | see vendor docs |
| Trial period | — none; 14-day refund instead | see vendor docs |
WHMCS column reflects publicly available vendor documentation as of July 2026. Verify current details at whmcs.com.
Breadth of integrations. Two decades of module development means there is a WHMCS module for almost every registrar, control panel, gateway and regional tax rule. FluxBilling ships SolusVM 2 and installs Virtualizor, Pterodactyl and cPanel / WHM from the marketplace — but Proxmox, Plesk and OpenStack are planned, not shipped. If one of those is load-bearing for your business today, WHMCS plus the right module is the working answer and we are not going to pretend otherwise.
Maturity is the second one. FluxBilling is in open beta; WHMCS has years of production deployments, third-party developers and accumulated documentation behind it. If your operations team needs an established ecosystem and a large pool of contractors who already know the platform, that is a legitimate reason to stay. The case for switching is strongest when you run your own infrastructure and are currently paying for a biller, a DCIM tool, and a synchronisation job between them.
FluxBilling vs WHMCS, answered directly.
01.What is the main difference between FluxBilling and WHMCS?
Scope and architecture. WHMCS is a PHP billing suite that has shipped since 2003; data-centre inventory, IP management and many provisioning targets are added as separate modules. FluxBilling keeps billing, invoicing and dunning, multi-currency, EU VAT, DCIM with racks and U-positions, IPv4 and IPv6 IPAM, power and PDU monitoring, and every payment gateway inside one PostgreSQL schema behind a React 18 panel, with a K3s pod and isolated database per tenant.
02.How much does FluxBilling cost compared to WHMCS?
FluxBilling plans are flat per tier: Lite €4.95/mo (10 clients, 5 bare-metal servers), Plus €14.95/mo (250 clients, 50 servers), Professional €24.95/mo (500 clients, 100 servers), and Business €44.95/mo (unlimited clients, 150 servers). Extra bare-metal capacity is €0.75 per server per month, white-label is €50/mo on any tier, and self-hosting is a €1,495 one-time add-on. Every tier includes all payment gateways, DCIM, IPAM and the visual plugin builder. WHMCS licence tiers and module pricing are published by the vendor — check whmcs.com for current figures.
03.Can I migrate my WHMCS data to FluxBilling?
Yes. The WHMCS Importer is a core feature, not a paid add-on. It supports a dry-run so you can inspect what would be written before anything is, and it is idempotent and resumable, so an interrupted run can be restarted and a repeat run does not duplicate records.
04.Does FluxBilling support the same control panels as WHMCS?
Not the same catalogue. SolusVM 2 ships seeded into every tenant. Virtualizor, Pterodactyl and cPanel / WHM install from the marketplace. Proxmox, Plesk and OpenStack are planned and not shipped — if one of those is load-bearing for your business today, stay where you are until it lands.
05.Can I try FluxBilling before committing to a plan?
There is no trial licence and no scheduled demo call. Instead every plan carries a 14-day refund window and can be cancelled at any time, so the evaluation happens on your own data in a real instance rather than in a sandbox.
06.Which payment gateways does FluxBilling include?
Stripe is seeded into every tenant. PayPal, Mollie, CoinGate, GoCardless, Authorize.Net, 2Checkout, Paddle, Skrill, CoinPayments, BitPay, Worldpay and CCAvenue install from the marketplace. Bank Transfer is provided as a build-it template and Square is planned. Gateways are included in every plan rather than licensed individually.
Send your WHMCS install size. We scope the cutover.
Client count, service count, and the modules you depend on. You get back a migration plan, an honest list of anything that has no equivalent yet, and the tier that fits. Plans start at €4.95/mo, with a 14-day refund and no minimum term.
WHMCS is a registered trademark of WHMCS Limited. FluxBilling is not affiliated with, endorsed by, or sponsored by WHMCS Limited. This comparison reflects publicly available documentation and pricing as of July 2026 and may not reflect the most current state. Verify all details with the respective vendors before purchasing.