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Sites are what you are billed for. Add-ons raise a single allowance on a single site.

Sites

Each site is a separate project: its own keywords, articles, audits and connected CMS. One is included with Pro, and you can cover up to 20. Adding a site takes effect immediately and is prorated — you pay for the part of the month you actually use.
Releasing a site is different: see Changing your plan. It takes effect at the end of the period you have already paid for, and the project is archived rather than deleted.

Add-ons

Additional articles

Raises one site from 30 articles a month to 60 or 90. Requires Pro.

Image presets

Custom brand image styles, generated on your own presets. Requires Pro.

Backlinks

Directory submissions that build referring domains. Works on any plan, including Free.
Add-ons attach to one site, not to your whole account. Two sites that both need 90 articles a month need the add-on twice.

Tiers replace, they don’t stack

This is the part people expect to work the other way. Moving from the 60-article tier to the 90-article tier gives you 90 articles a month, not 150. The tier is your new allowance — it replaces what the plan gives you rather than adding to it. The same is true in reverse: dropping to a smaller tier lowers your allowance to that tier’s number. You always hold at most one of each add-on per site, so there is no way to accidentally buy two and pay twice. Backlinks is the one add-on that does not require Pro. A Free account can buy it, stays on the Free plan, and gets backlink credits and nothing else. If you later cancel Pro, your backlinks package is untouched — it never depended on Pro in the first place.

Seeing the price before you commit

Every add-on purchase and site change shows you the exact amount first, taken from Stripe rather than estimated.
This matters most on the annual plan. Adding an add-on two months into a year produces a large prorated line, because you are buying the remaining ten months at once. The amount is correct — check it before confirming.

Changing your billing interval

Switching from monthly to annual applies straight away, prorated. Switching from annual back to monthly is scheduled for your renewal date instead. Doing it mid-year would mean crediting most of a year and re-billing a month, which is a refund wearing a costume — so we wait for the year you paid for to finish.