Traffic Caps and What an Overage Actually Costs

Traffic caps are the most consequential and least discussed number on a landing page builder’s pricing page. They decide what you actually pay, they punish the campaigns that work best, and the vendors do not measure the same thing as each other. This piece sets the caps side by side and explains how to size a plan before a campaign starts rather than after it has overrun.

All allowances below were read from the vendors’ own pricing pages on 21 September 2026, and they support the best landing page builders ranking.

The caps, tier by tier

Unbounce labels its meter traffic volume: up to 500 on Starter at $22 a month annually, up to 20,000 on Build at $74, up to 30,000 on Experiment at $112, up to 50,000 on Optimize at $187.

Swipe Pages counts visits: 20,000 on Startup at $29, 50,000 on Marketer at $69, 500,000 on Agency at $149.

Instapage counts unique monthly visitors: 15,000 on Create at $79, 30,000 on Optimize at $159, described as expandable to 50,000.

Landingi counts visitors: 2,000 on Build at $24, 30,000 on Optimize at $119, then 100,000, 200,000 or 500,000 across the Scale band from $229 to $599.

Leadpages states no traffic limit at all on its Leadpages-branded tiers. Its meter is custom domains instead: four, six or ten.

Three different units

Look again at those labels. Unbounce says traffic volume. Swipe Pages says visits. Instapage says unique monthly visitors. Landingi says visitors. They are not interchangeable and the difference can be large.

A visit meter counts each arrival. Somebody who reads your page on Tuesday, thinks about it, and comes back on Thursday to fill in the form has cost you two visits and one unique visitor. For an impulse purchase the two numbers are close. For a considered one — software, a service, anything above about a hundred dollars — return rates are high enough that a unique-visitor allowance stretches meaningfully further than a visit allowance of the same size.

So Instapage’s 15,000 unique visitors on a $79 plan is not straightforwardly worse value than Swipe Pages’ 20,000 visits on a $29 plan; the units are different, though the price gap is wide enough that the conclusion survives anyway. Where it matters more is in the middle of the table, where Unbounce’s 30,000 traffic volume at $112 sits against Instapage’s 30,000 unique visitors at $159 — same number, different unit, and the more expensive one is counting more generously.

If you are building a comparison of your own, put the unit in its own column. Nobody else’s comparison does, and that is how the category stays confusing.

What happens when you cross the line

Only one vendor tracked here publishes a rate. Swipe Pages states $5 for every additional 5,000 visits beyond the cap.

That is a tenth of a cent per visit, which is cheap, and it is a charge rather than a wall — the page keeps serving and the bill grows. Knowing the number in advance is a genuine courtesy and it lets you calculate the worst case. A tenfold spike on the $29 Startup plan, 200,000 visits against a 20,000 allowance, is 36 blocks of 5,000 at $5: $180 on top of the subscription.

The other four vendors do not publish an equivalent rate on their pricing pages. That does not mean there is no consequence; it means the consequence is in the account terms and the upgrade prompt rather than on the page you are comparing. Before committing to a plan whose cap you might plausibly exceed, ask the vendor in writing what happens at the ceiling. The two answers that exist are “we charge you” and “we stop serving your page”, and you very much want to know which one you have bought.

Sizing a plan before you buy

Work forwards from the money, not backwards from the plan.

1. Decide the monthly traffic spend. Say $800.
2. Estimate the cost per click for your channel and keyword set. Paid search on a commercial term might be $3; a broad social audience might be 40 cents.
3. Divide. At $3, that $800 buys roughly 265 clicks a month. At 40 cents it buys 2,000.
4. Add everything that is not paid. Organic arrivals, email, direct, the link somebody posts. On a campaign page this is usually small, but it is not zero.
5. Multiply by a spike factor. Two is a reasonable default; more if you have any chance of a placement or a mention.

That last number, not your average month, is what the cap has to cover. The arithmetic also shows why Landingi’s 2,000-visitor Build tier is narrower than it sounds: a single cheap-click campaign clears it in a fortnight, while an expensive-click campaign at the same budget never comes close.

Price per thousand visits, at the testing tier

The cleanest way to compare metered plans is to divide the tier price by the traffic it allows. Doing that at each vendor’s cheapest testing tier gives a single comparable number.

• Swipe Pages Marketer — $69 for 50,000 visits, or $1.38 per thousand
• Unbounce Experiment — $112 for 30,000, or $3.73 per thousand
• Landingi Optimize — $119 for 30,000, or $3.97 per thousand
• Instapage Optimize — $159 for 30,000 unique visitors, or $5.30 per thousand
• Leadpages Grow — $79, no traffic meter, so the figure falls as you grow

Two caveats before anyone quotes those numbers. Instapage’s unit is unique visitors, so its figure is not directly comparable with the rest and is more generous than it looks. And Leadpages has no denominator at all, which is precisely the point — at 25,000 visits it is $3.16 per thousand, at 100,000 it is $0.79, and at 500,000 it is sixteen cents.

Per-thousand pricing is the number to recalculate whenever your traffic doubles. The ordering it produces is not stable across volumes, and a plan chosen at launch is frequently the wrong plan a year later.

The structural problem with metering

Every visit meter in this category shares one flaw: the bill rises exactly when the campaign starts working.

That is an uncomfortable property. A page that suddenly does well is a page that is suddenly costing you more in platform fees, at the moment you least want to be dealing with an upgrade. It is also, from the vendor’s side, an entirely reasonable way to charge — more traffic is more infrastructure and more value delivered.

It is the reason Leadpages ranks first here despite having a narrower toolkit than Unbounce. Its bet is the other way round: charge for domains, which do not grow when a campaign succeeds, and let traffic run. For a single-brand advertiser that is structurally the better deal, and the Leadpages review works through where it stops being one.

The short version

Find the unit. Find the cap. Find out what happens at the cap, in writing. Size the plan from your traffic budget and double it.

Do that before you subscribe and the plan you choose will still fit in month four, which is more than can be said for most purchases in this category. The caps for all five platforms, with the tier prices attached, are in the best landing page builders ranking.