Findings first
SaaS vendors routinely use terms that change the real cost or capability without saying so plainly. Words such as "seat", "editor", "guest", "monthly active user (MAU)" and "intro price" are not neutral — they each redraw who is billable, what features are available, or how much you pay on renewal. Read the definitions below and check the vendor's billing rules before you commit.
1. "Seat", "user" and the perennial per‑seat trap
What vendors mean: a "seat" (or "user") often means a billable account that can sign in and use the product as a full member. That looks simple, but vendors differ in who becomes a billable seat: some count only named, paid members; others count anyone with access to a workspace; some require minimum seat purchases. Always read the billing section on the vendor page to see when someone stops being free and becomes billable.
Why it matters: pay attention to minimums and to whether guests, contractors or inactive people count as seats — that can double or triple the headcount you must buy.
Examples to check: Trello explicitly says paid plans are charged per user and explains which workspace members count as billable. See Trello's pricing notes for details. support.atlassian.com
2. "Editor", "viewer", "commenter": licensing by capability
What vendors mean: some products separate full licences (editors) from read‑only licences (viewers). A single product can allow unlimited viewers but charge for editors; in other products the line between editor and viewer varies.
Why it matters: if your workflow needs editing rights for many people you must buy that many editor licences. Conversely, if most people only need to view content, a product that offers unlimited viewers can be much cheaper.
Examples: Figma sells "editor" licences and allows unlimited viewers in many configurations — the vendor's pricing page describes the roles and the billing model you should expect. figma.com
3. Guests, single‑channel guests and multi‑channel guests
What vendors mean: "guest" is a deliberately flexible term. Some guests count as full billable users; others have tightly limited access (one channel or one board) and remain free. Vendors will often call a low‑access external collaborator a "guest" while still billing them as a full member under certain plans.
Why it matters: if you work with many external contractors or clients, check whether a contractor invited to a single channel is treated as a free guest or as a paid member on your plan.
Examples: Slack explains different guest roles and the access each role gets; read Slack's help pages to understand when guests are limited and when they are not. slack.com
4. MAU, API calls, credits and other usage metrics
What vendors mean: not every vendor charges per seat. Some charge by "monthly active users (MAU)", by API calls, or by consumable credits. Those terms mean your bill tracks usage, not just headcount.
Why it matters: MAU and API pricing reduce the predictable per‑month price but make costs variable and sometimes hard to forecast. If your usage spikes — a campaign, a data import or a sold‑out event — the bill can spike too.
What to check: the vendor's definition of an "active" user (is a login required? an API call?) and any caps or overage prices. Vendor documentation will show how they count and when they bill.
5. Audience, contacts and billable records (email platforms)
What vendors mean: email/SMS marketing systems usually bill by the number of contacts you store or can send to. That sounds obvious until you find that "stored" contacts include archived or disabled entries in some vendors’ rules.
Why it matters: list hygiene matters. If a vendor counts all contacts you can engage through the service as billable, you pay for every recoverable contact unless you delete or permanently archive it.
Examples: Mailchimp lays out that pricing is based on billable contacts in your audiences and explains how archiving/unarchiving affects billing — check Mailchimp's pricing and help pages to see the exact rules. mailchimp.com
6. "Intro" or promotional pricing vs renewal pricing
What vendors mean: vendors often advertise an "introductory" rate or discounted first term. Renewal (regular) price may be higher; the change might be noted only in the subscription agreement or in small text on the pricing page.
Why it matters: your long‑term cost depends on the renewal price, not the intro price. Make decisions based on what you will pay after the promotion ends, and check whether existing customers are grandfathered or whether everyone moves to the higher rate on renewal.
Examples: Canva has used introductory pricing and its subscription agreement specifies how renewal price notices are given; sales and community posts discuss cases where customers saw a higher renewal price than their original sign‑up price. Always check the vendor's renewal policy before committing. public.destinyhosted.com
7. Flat‑rate or site licence with tiered limits
What vendors mean: a "flat‑rate" product charges a single fee for a pool of capability (for example, unlimited users up to a given storage or automation limit). That looks simple, but most flat‑rate plans have hard limits inside the plan — storage, automations, API calls — beyond which you pay more or are throttled.
Why it matters: a flat monthly fee doesn't mean unlimited usage. If your team will store large amounts of data or run lots of automations, ask for the precise limit and the overage cost.
Examples from our catalogue: products listed in our catalogue that use flat‑rate pricing include Plutio, Canva (Business/Teams/Enterprise tiers) and SuiteDash. Use the vendor pages to find the limits that sit behind the flat price.
8. Minimum seat counts, per‑team minimums and billing cadence traps
What vendors mean: some plans impose a minimum number of seats (for example, a 3‑seat minimum on small team plans) or change the per‑seat price depending on whether you pay monthly or annually. That means the checkout total can differ from the advertised per‑seat number.
Why it matters: check whether the price you see is a per‑seat example, a per‑seat minimum or an annual‑only rate. Also note whether vendor discounts for annual billing apply only to new customers or also to renewals.
Examples: Trello advertises per‑user pricing with annual and monthly variations and shows which users are billable. monday.com documents seat‑based pricing and also publishes guidance on plan and team size where minimums can appear. trello.com
How to read any vendor page without getting surprised
- Find the vendor's definition boxes for "user", "guest", "editor" or "active" — those are the billing definitions. If you cannot find them on the pricing page, look for the vendor's help or terms pages and search for "billing" or "contacts". The vendor's documentation is the primary source you should rely on.
- Ask for an example invoice. Vendors will usually provide an example or an FAQ showing how a 25‑user team or a 1,000 contact audience is billed.
- Check renewal terms and the subscription agreement for price increases and notice timing. Some vendors promise a notice period before increases; others reserve the right to change pricing with minimal notice. See vendor terms for the exact wording.
- Model a worst‑case month. For MAU and API billed products, estimate a high‑usage month and get an estimate from the vendor to avoid surprise overages.
- Document who in your organisation will be a billable seat vs a guest vs a viewer — then enforce that on the vendor account. It’s the fastest way to control cost growth.
Quick reference: where to look on the vendor pages
- Pricing page — advertised tiers and sample per‑seat numbers (start here).
- Help/Support pages — definitions of "guest", "member", "editor" or "viewer" (often under "sharing", "roles" or "billing").
- Terms and subscription agreement — renewal and price‑change clauses, notice periods.
- Billing settings in your account — real checkout numbers and prorations you will actually be charged.
Examples in our catalogue
The prices we hold in our catalogue show how different models translate into numbers you can compare: for seat‑based products see Slack (entry monthly $8.75; annual equivalent $7.25), Figma (entry monthly $20.00), Notion (entry monthly $10.00) and Airtable (entry monthly $24.00; annual equivalent $20.00). For flat‑rate products see Plutio (entry monthly $19.00) and SuiteDash (entry monthly $19.00). These catalogue figures are the list numbers we hold — always verify on the vendor pages for the details that change the real bill (guest rules, MAU definitions, intro vs renewal).
Final practical checklist before you sign
- Which people are billable seats in practice? (staff, contractors, external agencies?)
- Are there role‑based licences (editor/viewer)? If so, how many editors do you genuinely need?
- Do contacts/recipients count while archived? (email tools often do.)
- Are you on an intro price and, if so, what is the renewal price and notice period?
- Are there minimum seat counts or annual‑only discounts that change the effective per‑seat cost?
Read the vendor's billing definitions — that's where the real price lives.
If you want, name one or two vendors you’re considering and I’ll show exactly which lines to read on their pricing or terms pages and what to ask sales before you commit. I will reference the vendor pages and their help/terms documents, not personal testing.