Free tiers are budgets, not gifts
Every serious platform offers a free tier for the same reason: it wants you to build the evaluation habit on its product. That is a fair trade, and for an early product it is often the right one. But a free tier is a small budget with hard edges, not a preview of what the paid product feels like. The plan's marketing name tells you nothing. "Starter", "Hobby" and "Free" are labels; the limits page is the contract.
The mistake that costs founders a weekend is treating the free tier as an environment and discovering its limits in production, at the worst possible moment, usually on a launch day or during a demo. The checks below take about an hour and prevent nearly all of those surprises.
Find the three numbers that matter
Almost every free tier caps some combination of the same three things. First, throughput: requests, invocations, reads and writes per day or per month. Second, storage: how much data, how many files, how much bandwidth leaving the platform. Third, scope: how many seats, projects or environments the plan allows. Write the three numbers down with their units and reset windows. A limit of 100,000 requests per day and one of 100,000 per month are very different products, and the difference hides in a footnote. Also check whether usage counts per account or per project; a per-account cap shared by your experiments and your real product is smaller than it looks.
Learn what the cap does before you touch it
Platforms respond to an exhausted limit in one of three ways: they throttle you to a crawl, they stop serving until the window resets, or they start billing. Each is survivable if you chose it in advance; each is miserable as a surprise. Look for the behavior in writing. Well-run platforms publish exact numbers and behavior on a limits or quotas page - Cloudflare's Workers limits page is a good example of the format, with per-plan request, CPU and duration limits spelled out. Watch also for fair-use language: some plans advertised as generous reserve the right to throttle usage they consider abnormal, which is a limit wearing a friendlier name.
Set your own alarm first
Do not rely on the platform's usage email as your early warning. Provider dashboards can lag, and some alerts arrive after the cap, not before it. Put your own counter on the expensive operations, and alert yourself at 70 or 80 percent of the documented limit. If the platform offers usage-based alerting, turn it on as a backstop rather than as the only line of defense. A launch-day traffic spike is exactly when you want the warning to be yours.
Price the exit before you need it
Finally, write down two exit numbers: what the first paid tier costs at your current usage, and what it costs at ten times your current usage. Some pricing curves are gentle; others have a cliff between the free tier and the next step. And check that your data can leave - an export path matters as much as a price. A free tier you can outgrow cheaply is infrastructure. A free tier you cannot leave cheaply is a commitment you made without noticing.