"Unlimited" plans: where the unlimited stops
No vendor prices "everything unlimited". They price one meter unlimited, and the meter they expect you to run out of next, finite. The infinity symbol is real — but it is attached to a resource you were never going to exhaust, while the resource you will exhaust is measured in hundreds.
Anatomy of an unlimited
The pattern is consistent enough to be a template. Find the infinity symbol on any pricing page and ask: unlimited of what, per what?
- Wave's free Starter plan: unlimited invoices, unlimited clients — genuinely, and verified. The meter next to it is the 2.9% + $0.60 card fee, which scales with every dollar you bill. The unlimited sits on the resource that costs the vendor nothing; the finite-feeling number sits on your revenue. We did that arithmetic in where the fee on an $800 invoice goes.
- Kit's free plan: unlimited emails — to a maximum of 10,000 subscribers. Both statements are true on the same page. The unlimited is on volume; the hard number is on audience. Which one you hit first depends entirely on whether you grow your list or send to it.
- beehiiv's free plan: the ceiling is the subscription count (2,500), not sending. Same architecture, different boundary.
Notice what the unlimited purchases psychologically: it removes one anxiety so that the real limit can sit unexamined. That is not deception — every number above is published. It is attention allocation.
The meter inside a paid plan: monday's automation ops
The sharpest example we verified is monday.com, and it is worth dissecting because the limit sits inside the paid plans, not the free one.
monday measures automations in "actions per month": 250 on Basic, 25,000 on Standard, 250,000 on Pro. Read those steps again. Basic to Standard is a hundredfold jump. That curve is not an accident — 250 actions is about eight per working day, which a three-person team exhausts with any serious automation habit, and Standard's 25,000 is effectively infinite at that team size. The plan ladder is built so that the automation wall is the specific wall that pushes you from Basic to Standard. We mapped the full ladder, including the 3-seat minimum, in monday pricing explained.
Which means "unlimited boards, unlimited docs, unlimited items" on the tier comparison is true and simultaneously the wrong sentence to read. The finite number is the one in the automation row.
The meter that arrived last year: AI credits
A new family of finite meters is arriving inside plans that used to have none: AI credits. Streak's plans include pooled monthly AI credit allowances (20 / 150 / 500 across its tiers, verified for our Streak breakdown), exhausted by AI-assisted actions inside the product, with top-ups sold in blocks. Expect this pattern everywhere: a plan that was "unlimited" becomes metered the day the vendor attaches an AI feature to a resource with real per-unit cost (model calls). The infinity symbol on last year's page does not survive the arrival of per-token economics.
The credit design has a property worth naming: credits are typically pooled and non-rolling. The team shares one bucket, and unused credits expire monthly. A heavy AI week starves everyone; a quiet month donates its allowance back to the vendor. Metered abundance, in both directions.
How to audit an unlimited in ninety seconds
- Find the row with a number in it. On any plan comparison, the finite rows are the product. Read the automation/action/credit rows before the infinity rows.
- Convert the number to days. 250 actions a month is eight a day. 20 AI credits is under one a day. A limit divided by working days tells you whether it is a fence or a cliff.
- Ask what happens at zero. Does the feature stop, degrade, or bill? We catalogued the four behaviours in what happens when you hit a limit — the same taxonomy applies inside paid plans.
- Price the step, not the plan. The real cost of a plan is the tier you will be forced onto. Our method for computing that is in how to read a SaaS pricing page.
What we cannot verify
The numbers cited — monday's 250/25,000/250,000 action tiers, Streak's 20/150/500 pooled AI credits and paid top-up blocks, Wave's unlimited invoicing with published card fees, Kit's unlimited sends to 10,000 subscribers, beehiiv's 2,500-subscriber free ceiling — were read from vendor pricing pages on October 23, 2026. We have not measured real-world automation consumption on our own monday workspace or exhausted Streak's credits in testing, so the "eight per day" style conversions are arithmetic, not telemetry. Vendor definitions of one "action" or one "credit" are documented thinly and may change without notice. See How We Test.