Isn't ClientExec's lifetime license cheaper long-term?

For a small operator with a static feature set, yes — the one-time fee is unbeatable on TCO. The cost shows up elsewhere: ongoing patches typically require an active support tier and the codebase is older PHP. If you don't need active feature shipping or a modern stack, ClientExec wins on raw cost.

Why pay a SaaS subscription instead of buying once?

You're paying for ongoing development and managed hosting, not the binary. FluxBilling ships continuously, includes hosting, and bundles DCIM and all gateways. A lifetime license model is the binary only; hosting, ongoing patches, and newer features typically sit behind paid tiers elsewhere.

Does FluxBilling have a one-time license tier?

Not a perpetual license — every tier is a subscription. But the Business tier offers self-host: keep the monthly subscription and pay a one-time fee to run it on your own infrastructure, with the same billing, DCIM, and provisioning. Lite, Plus, and Professional stay managed. Updates ship continuously either way; the difference is where it runs.

Can I migrate from ClientExec?

There is no automated one-click ClientExec importer today. Migration is a services engagement: our team writes a one-off mapping for your install, runs a test import on a sandbox, and walks you through cut-over. Open a ticket with your ClientExec version and rough record counts and we will scope it.

Will my customers be forced to reset passwords?

Yes. There is no automated cross-platform password-hash rehash; at cut-over a password reset email is sent so customers can set a fresh password on FluxBilling. We help schedule the email and the comms around it.

How do you compare on security posture?

CSP headers, rate limiting, IP allowlisting, email-code 2FA, and a per-tenant activity log are on by default. Patches roll out across the SaaS fleet without a separate paid maintenance tier.

Alternative to ClientExec

The ClientExec alternative built like an app.

ClientExec is a long-standing, lifetime-license PHP billing platform. FluxBilling is a ClientExec alternative built as a multi-tenant SaaS: a React 18 SPA with automated recurring billing, integrated DCIM, a visual plugin builder, and continuous updates. Trade-offs honestly compared, migration steps spelled out.

Plan a migration All platform comparisons

Plans from €4.95/mo·Migration support included·last reviewed 2026-05-11

Platform deltas

Where the platforms diverge.

The four facts that summarise the difference between ClientExec and FluxBilling. Everything else is consequence.

K3s
Per-tenant isolation: DCIM
Same schema as billing: 0
Per-gateway add-on cost: Visual
Plugin builder

Feature-by-feature

Side-by-side, no asterisks.

Based on publicly available ClientExec documentation as of May 2026. Verify current capabilities with the vendor before purchase.

Feature	FluxBilling	ClientExec
License model
Distribution	SaaS subscription	License + optional hosting
Lifetime license	—	Owned outright
Updates included	Continuous, no extra tier	Annual support tier
Hosting	Managed, included; Business self-hosts	Self-host or hosted add-on
Stack & UI
Frontend	React 18 SPA	Server-rendered PHP
Page-reload-free admin	Yes	No^[1]
Visual plugin builder	Yes	No^[1]
Operator surface
Integrated DCIM (rack + IPAM)	Yes	No^[1]
Bare metal IPMI/Redfish	Yes	No^[1]
JSON plugin manifest	Yes	No^[1]
Multi-tenant SaaS option	Yes	No^[1]
Provisioning
Proxmox / Virtualizor / SolusVM 2	Native	Limited^[1]
Auto-suspend on overdue	Yes	Yes
Stock check + allocation	Built-in	Manual^[1]
Security & audit
Public roadmap	Yes	No^[1]
Two-factor auth	Email-code 2FA	Email-code 2FA^[2]
CSP + rate limiting	On by default	Partial^[2]
Per-tenant activity log	Yes	Limited^[2]

[1] Source: clientexec.com product and feature documentation; not advertised as a built-in capability (captured 2026-05-11).
[2] Source: clientexec.com security and account-settings documentation (captured 2026-05-11).

source: clientexec.com docs · reviewed 2026-05-11

Migration path

From ClientExec to FluxBilling.

Five steps the migration team walks through with you. There is no in-app ClientExec importer yet — migration runs as a services engagement, scoped and executed by our team. Most operators clear the journey in two to three weeks of part-time work.

01.
Scoping call
You send your ClientExec version, rough record counts (clients, services, invoices), payment gateways in use, and any custom modules. The migration team replies with a written scope and timeline.
~ 1 day
02.
Schema mapping
We pull a database schema dump and write a one-off mapping for your install: clients, products, invoices, payment profiles, tickets, custom fields. Anything that does not map cleanly is flagged early.
~ 1 week
03.
Plugin parity
For each ClientExec module you depend on (gateway, provisioner, custom hook), we either point to an equivalent FluxBilling visual plugin or build a one-off using the visual builder.
~ 1 week
04.
Cut-over
Final import on a fresh tenant, DNS swap, gateway re-tokenisation. Customers will need to set a new password on first sign-in (a password reset email is sent at cut-over) — there is no automated cross-platform hash rehash.
~ 2h window
05.
Post-cutover
Two weeks of priority support while ticket history, dunning rules, and any custom email templates settle in. ClientExec read-only is kept up for archival.
14 days

Why different

Four mechanisms, not adjectives.

The differences that show up in day-to-day operator work. Concrete, measurable, and the reason migrations get planned in the first place.

Modern stack, on purpose: React 18 SPA, queued workers, optimistic UI. The platform feels like an app — because it is one. ClientExec's core remains classic server-rendered PHP, with the constraints that come with it.
DCIM is core, not bolted on: Rack U-positions, IPAM hierarchy, IPMI/Redfish bare-metal control are first-class objects in the same database as your invoices, feeding straight into automated provisioning. No separate DCIM product to license and sync.
Plugins via visual flows: New gateway, new provisioner, new notification channel — built on a node-based flow editor with a JSON manifest format. Stored in the tenant database, not files dropped over FTP.
Active development: Public roadmap, continuous patches across the SaaS fleet, no separate maintenance tier required to receive security updates.

Honest no-list

When ClientExec is the right call.

A SaaS subscription is not always the answer. Three situations where ClientExec genuinely wins, and we will say so up front.

Lifetime, low-volume

A five-customer side hustle with a fixed feature set will out-economise any SaaS subscription on TCO. ClientExec's one-time license is genuinely unbeatable there.

On-prem only, no exceptions

The Business tier self-hosts on your own infrastructure for a one-time fee (the subscription continues), which covers most on-prem requirements. Lite, Plus, and Professional are SaaS only. If you need an on-prem install below Business, or fully air-gapped with no license check-in at all, ClientExec's self-hosted license fits there and FluxBilling does not.

Existing module investment

A library of ClientExec custom modules you do not want to rewrite right now is real switching cost. Stay until the FluxBilling plugin equivalents land or until you're replatforming anyway.

FAQ

Common questions before switching.

Isn't ClientExec's lifetime license cheaper long-term?: For a small operator with a static feature set, yes — the one-time fee is unbeatable on TCO. The cost shows up elsewhere: ongoing patches typically require an active support tier and the codebase is older PHP. If you don't need active feature shipping or a modern stack, ClientExec wins on raw cost.
Why pay a SaaS subscription instead of buying once?: You're paying for ongoing development and managed hosting, not the binary. FluxBilling ships continuously, includes hosting, and bundles DCIM and all gateways. A lifetime license model is the binary only; hosting, ongoing patches, and newer features typically sit behind paid tiers elsewhere.
Does FluxBilling have a one-time license tier?: Not a perpetual license — every tier is a subscription. But the Business tier offers self-host: keep the monthly subscription and pay a one-time fee to run it on your own infrastructure, with the same billing, DCIM, and provisioning. Lite, Plus, and Professional stay managed. Updates ship continuously either way; the difference is where it runs.
Can I migrate from ClientExec?: There is no automated one-click ClientExec importer today. Migration is a services engagement: our team writes a one-off mapping for your install, runs a test import on a sandbox, and walks you through cut-over. Open a ticket with your ClientExec version and rough record counts and we will scope it.
Will my customers be forced to reset passwords?: Yes. There is no automated cross-platform password-hash rehash; at cut-over a password reset email is sent so customers can set a fresh password on FluxBilling. We help schedule the email and the comms around it.
How do you compare on security posture?: CSP headers, rate limiting, IP allowlisting, email-code 2FA, and a per-tenant activity log are on by default. Patches roll out across the SaaS fleet without a separate paid maintenance tier.

ClientExec is a trademark of its operator. This page is not affiliated with, endorsed by, or sponsored by ClientExec. All product names, logos, and trademarks are the property of their respective owners. Comparison data is based on publicly available documentation and pricing as of May 2026, is provided for informational purposes only, and may not reflect the most current features or pricing. Verify all details directly with the respective vendors before making purchasing decisions.

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Try it on your own data. Refund inside 14 days if it’s not the fit.

Pick a tier and provision a tenant in under two minutes — isolated K3s namespace, your own database, the full product. If FluxBilling isn’t the right fit inside 14 days, open a ticket and we’ll refund the subscription. No sales call, no qualification gate.

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< 1 min
02.
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Isolated K3s namespace + your own PostgreSQL database. Full product, your data.
< 2 min
03.
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Not the fit? Open a ticket within 14 days and we refund the subscription. No questions, no qualification gate.
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