Unlimited clients and up to 250 clients are two different commercial theories, not two points on one scale. Who counts, what overage costs, and the five counting rules to get in writing.
Ilinca Bostan6 min read"Unlimited clients" and "up to 250 clients" look like two points on the same scale. They are not. They are two different commercial theories about what a billing platform is worth, and the choice between them determines how your software bill behaves for the next five years.
This post lays out how each vendor counts, what overage costs where it is published, and where each ladder stops. All figures read from vendor pricing pages on 18 August 2026.
How this was sourced. FluxBilling publishes this comparison and sells one of the products in it. Every competitor figure was read from that vendor's own pricing page on 18 August 2026; sources are linked at the end. Figures are in the currency each vendor publishes, with no exchange rate applied. Vendors define "active client" in their own terms and conditions — the counts below are what is published on pricing pages, not a legal reading of each contract.
| Platform | Counts clients? | Range published | Overage |
|---|---|---|---|
| WHMCS cloud | Yes | 25 / 100 / 300 | $0.40 per client (Starter, to 50); $0.25 (Growth, Expansion) |
| WHMCS self-hosted | Yes | 250 / 500 / 1,000 | Move up a tier |
| Blesta | No | Unlimited on every plan | None |
| Clientexec | No | Unlimited on every plan | None |
| HostBill | No | Editions gate features, not clients | None |
| EasyDCIM | Devices/services, not clients | 25–1,000+ | Move up a tier |
| FluxBilling | Yes, to a point | 10 / 250 / 500 / Unlimited | Move up a tier; servers €0.75 each |
| Upmind | Not published | Not published | Not published |
| WiseCP | Not readable at capture | Not readable at capture | Not readable at capture |
WHMCS is the clearest example because it publishes both a ladder and an overage rate. The cloud tiers are $9.99/month for 25 clients, $25.00/month for 100 and $75.00/month for 300, with additional clients at $0.40 each on Starter (up to 50) and $0.25 each on Growth and Expansion. The self-hosted licence ladder is $34.95/month for 250, $54.95/month for 500 and $84.95/month for 1,000.
Three consequences follow, and none of them are hypothetical.
Your software bill grows with success, on the same curve as your revenue but without the same margin. Adding 250 clients is not free on a per-client platform; it is a tier move. That is defensible pricing — the vendor's costs and your value both scale with usage — but it should be in your model.
Cheap clients cost the same as expensive ones. A customer on a small shared-hosting plan and a customer on a large dedicated server both consume one seat. If you sell a long tail of low-value accounts, per-client pricing is structurally hostile to your business model in a way that is invisible on the pricing page.
The ladder has a top. The published WHMCS self-hosted ladder stops at 1,000 clients. Past that, the next step is not on the pricing page. Providers who expect to cross that line should establish what happens there before they are there, not after.
Blesta and Clientexec put unlimited clients on every plan — $17.95/month and $16.95/month respectively at the branded entry — and HostBill does not count clients at all, gating features by edition instead. That is genuinely simpler, and for a provider with thousands of small accounts it is the correct structural choice.
The trade-off is that unlimited pricing has to recover cost somewhere else. On HostBill it is recovered in the edition ladder: IPAM at Enterprise ($999), colocation at Data Center ($1,599), everything at All-Inclusive ($5,999). On Blesta it is recovered in branding and IP-locking tiers — $17.95 branded, $20.95 unbranded, $23.95 Flex for a licence not tied to one IP. On Clientexec it is $16.95 branded against $19.95 unbranded.
Nobody is giving anything away. The question is only which axis you would rather be charged on: how many customers you have, or which capabilities you use.
Vendors define "active client" differently, and the definition matters more than the number. Before you sign, get written answers to these:
The last one is the one to insist on. A platform that silently blocks new signups at a limit is an outage on your best day of the year.
FluxBilling counts clients on three of its four tiers and stops counting on the fourth: Lite €4.95/month (10 clients, 5 servers), Starter €24.95/month (250 clients, 50 servers), Professional €34.95/month (500 clients, 100 servers), Business €44.95/month (unlimited clients, 150 servers). Servers beyond the tier allocation are €0.75 per server per month. Above roughly 20,000 servers it becomes a quote rather than a tier.
Being straightforward about the weak end of that: FluxBilling Lite includes 10 clients. That is a genuinely small allowance, smaller than WHMCS cloud Starter's 25, and any provider past a handful of customers will be on Starter or above. If your requirement is "unlimited clients for the lowest possible monthly fee", Clientexec at $16.95 and Blesta at $17.95 are below FluxBilling Business at €44.95 and this post is not going to pretend otherwise.
Where our count differs in a way that matters is the second axis: we count servers as well as clients, because the platform tracks the hardware, and DCIM, IPAM and provisioning are on every tier rather than gated behind an edition. A provider with 60 clients and 300 machines is a different shape from one with 3,000 clients and no hardware, and only one of those shapes is served well by counting clients alone.
See current pricing and the platform comparisons.
Model your client count at 12, 24 and 36 months, then price every shortlisted platform at all three points and add the tier moves. A platform that is cheapest today and two tiers up in 18 months is not cheap. A platform with a flat price and a feature gate you will need to clear is not flat. The pricing page shows you today; your growth plan shows you what you are actually buying.
All product names are trademarks of their respective owners. This comparison is published by FluxBilling for evaluation purposes and is not endorsed by, affiliated with, or reviewed by any of them.
The boring version: every figure the major vendors published on their own pricing pages, in the units they published them. Two rows are deliberately empty, and this post explains why.
These two are not the same kind of product, so the honest comparison is EasyDCIM plus a billing platform against HostBill Data Center alone. Once you write it that way, the arithmetic changes.
A dollar a month separates them on price, so the decision is licensing terms. Blesta will sell you the licence outright; Clientexec will let you try it first. What else differs, and what neither one does.