FluxBilling vs Clientexec
Clientexec is a long-running PHP biller built to stay light. FluxBilling is a React 18 platform where invoices, DCIM, IPAM and provisioning share one PostgreSQL schema, and plans start at €4.95/mo with every payment gateway included. This page compares the two on scope, architecture, integrations and price.
- Status
- Founded 2025
- Pricing
- €4.95 – €25/mo, flat per tier
- Built for
- Billing + infrastructure operators
- Stack
- React 18 SPA, Bun + Express, PostgreSQL
- Tenancy
- K3s pod + isolated database per tenant
- Status
- Established
- Pricing
- Vendor licence tiers
- Built for
- Lighter-weight billing and support
- Stack
- PHP web application
- Tenancy
- Single-tenant install
Clientexec and FluxBilling are both billing systems for hosting companies, aimed at different operating profiles. Clientexec is a long-running PHP biller with a deliberately light footprint and a smaller integration catalogue — a reasonable fit for a shared-hosting or reseller business that mainly needs invoices, tickets and a client area. FluxBilling assumes you also run infrastructure: DCIM with racks, U-positions and cabling, IPv4 and IPv6 IPAM, power and PDU monitoring, bare-metal and VPS provisioning, and usage-based metering sit in the same PostgreSQL schema as invoices, behind a React 18 panel on Bun and Express with one K3s pod and isolated database per tenant. Payment gateways, EU VAT with reverse-charge and OSS, the reseller portal and the visual plugin builder are in every plan. Plans start at €4.95/mo and reach €25/mo for unlimited clients, with a 14-day refund and no minimum term.
FluxBilling and Clientexec, feature by feature.
The billing rows converge. The infrastructure block is where the two products stop being alternatives and start being different categories.
| Capability | FluxBilling | Clientexec |
|---|---|---|
| Positioning | ||
| Primary job | Billing plus infrastructure operations | Billing, client management and support |
| Typical operator | Runs own hardware, VPS or bare metal | Shared hosting, reseller, services business |
| Integration catalogue | Focused, extended with visual flows | Smaller catalogue |
| Product status | Founded 2025 | Long-running |
| Architecture | ||
| Admin + client interface | React 18 single-page app | PHP web application |
| Backend runtime | Bun + Express | PHP |
| Database | PostgreSQL | see vendor docs |
| Tenancy model | K3s pod + isolated database per tenant | Single-tenant install |
| Deployment | Hosted; self-host +€50 one-time | see vendor docs |
| 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 |
| Client portal + support tickets | ✓ | ✓ |
| Infrastructure & DCIM | ||
| DCIM: racks, U-positions, cabling | ✓ | — not native |
| IPAM (IPv4 + IPv6) | ✓ | — not native |
| Power & PDU monitoring | ✓ | — not native |
| Bare-metal capacity | 5 to 75 servers by tier, +€0.50/server/mo beyond | see vendor docs |
| Hypervisor / panel integrations | Proxmox VE, OpenStack, CloudStack, VirtFusion, Virtualizor, SolusVM 2, Pterodactyl, cPanel / WHM — free marketplace plugins | see vendor docs |
| Planned, not shipped | Plesk | see vendor docs |
| Payments | ||
| Gateways included in every plan | All included | see vendor docs |
| Pre-installed plugins | None — every gateway installs free, per tenant | see vendor docs |
| Marketplace gateways | PayPal, Mollie, CoinGate, GoCardless, Authorize.Net, 2Checkout, Paddle, Skrill, CoinPayments, BitPay, Worldpay, CCAvenue | see vendor docs |
| Build-it template | Bank Transfer | see vendor docs |
| Planned | Square | see vendor docs |
| Plugin model | ||
| Integration format | Visual flows stored as JSON in the database | PHP plugins on the filesystem |
| Visual flow builder | ✓ | — |
| Shipping an integration change | Edit and save in the admin UI | Install or update a plugin |
| Notification integrations | Telegram plugin | see vendor docs |
| WHMCS importer | Core: read-only against WHMCS | see vendor docs |
| AI Migration | Any MySQL, PostgreSQL, CSV or JSON source, imported on approval | see vendor docs |
| Commercial terms | ||
| Entry price | €4.95/mo (Lite, 10 clients, 5 bare metal) | see vendor docs |
| Mid tier | €14.99/mo (Professional, 250 clients, 50 bare metal) | see vendor docs |
| Top published tier | €25/mo (Business, unlimited clients, 75 bare metal) | see vendor docs |
| White-label | +€25/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 |
Clientexec column reflects publicly available vendor documentation as of July 2026. Verify current details at clientexec.com.
Simplicity, and a long track record. Clientexec has been billing hosting customers for many years and stays deliberately light — fewer screens, fewer concepts, less to learn on the first day. If you resell hosting and never touch a rack, most of what FluxBilling adds is surface you will never open, and paying for DCIM, IPAM and power monitoring you do not use is not an upgrade.
Stability is the second point. FluxBilling is a young product, founded in 2025; Clientexec is a mature product with years of releases behind it. If your billing works and nothing about it is costing you time, there is no argument here worth acting on. The switch makes sense when you have outgrown the biller — when racks, IP blocks or device records are living in a second system, and reconciling them with invoices has become somebody’s job.
Looking at this the other way round? The ClientExec alternative page covers the migration path, what carries over, and where FluxBilling does not fit.
FluxBilling vs Clientexec, answered directly.
01.What is the difference between FluxBilling and Clientexec?
Operating profile. Clientexec is a long-running PHP billing system with a deliberately light footprint and a smaller integration catalogue, aimed at invoicing, client management and support. FluxBilling covers the same billing ground and assumes you also run infrastructure: DCIM with racks, U-positions and cabling, IPv4 and IPv6 IPAM, power and PDU monitoring, and bare-metal plus VPS provisioning sit in the same PostgreSQL schema as invoices and clients.
02.How much does FluxBilling cost compared to Clientexec?
FluxBilling is a flat monthly price per tier: Lite €4.95 (10 clients, 5 bare-metal servers), Starter €9.99 (150 clients, 25 servers), Professional €14.99 (250 clients, 50 servers) and Business €25 (unlimited clients, 75 servers). Extra bare-metal capacity is €0.50 per server per month, white-label is €25/mo on any tier and self-hosting is a €50 one-time add-on. Clientexec publishes its own licence pricing — compare against the tier that matches your client count.
03.I only sell shared hosting. Do I need DCIM and IPAM?
Probably not. If you resell someone else’s infrastructure and never touch a rack, the DCIM and IPAM half of FluxBilling is surface you will not open, and a focused biller is a reasonable choice. The platform becomes worth the switch when you own hardware and are currently tracking racks, cabling or IP blocks in a second system or a spreadsheet.
04.Which integrations does FluxBilling ship with?
Every integration is a free marketplace plugin, installed per tenant; nothing is pre-installed. On the infrastructure side that is Proxmox VE, OpenStack, CloudStack, VirtFusion, Virtualizor, SolusVM 2, Pterodactyl and cPanel / WHM; Plesk is planned and not shipped. Gateways are Stripe, PayPal, Mollie, CoinGate, GoCardless, Authorize.Net, 2Checkout, Paddle, Skrill, CoinPayments, BitPay, Worldpay and CCAvenue; Bank Transfer ships as a build-it template and Square is planned. Anything missing is built as a visual flow rather than a PHP plugin.
05.Can I move my Clientexec data across?
Yes. There is no dedicated Clientexec importer, but AI Migration in the admin panel reads the Clientexec MySQL database without writing to it, proposes how clients, products, services, invoices and payments map across, shows a read-only preview and imports once a super admin approves. Tickets and custom fields stay behind, and clients set a new password. Send your record counts if you want the team to plan it with you.
06.Can I try FluxBilling before committing to a plan?
There is no trial licence and no scheduled demo call. A public live demo of both the admin and the client panel is open at demo.fluxbilling.app with no signup — a shared sandbox that resets every 10 minutes. Every plan carries a 14-day refund window and can be cancelled at any time, so evaluation happens in a real instance with your own data.
Outgrown the biller? Send the numbers.
Client count, service count, and whatever you currently track outside the billing system — racks, IP blocks, devices, spreadsheets. You get the tier that fits, a migration plan, and a straight answer on anything without an equivalent yet. Plans start at €4.95/mo, with a 14-day refund and no minimum term.
Clientexec is a trademark of its respective owner. FluxBilling is not affiliated with, endorsed by, or sponsored by the owner of the Clientexec trademark. 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.