The short answer
Before building anything on a free tier, find out what happens at the limit, what the next tier costs, and how you get your data out. Those three answers tell you what you are actually committing to.
Free tiers exist to convert you. That is a reasonable arrangement provided you know the terms.
The four questions
- What happens when you exceed the limit: throttling, a hard stop, or an automatic charge?
- What does the next tier cost at your expected usage, not at the headline price?
- Can you export your data in a usable format, without asking?
- Can the free tier be changed or withdrawn, and with how much notice?
- What support exists when something breaks, and what does it cost?
The first is the operationally urgent one. A hard stop at midnight on a busy day is a different risk from gradual throttling.
Limits that are easy to miss
| Limit | How it surprises you |
|---|---|
| Requests per month | A traffic spike consumes the allowance |
| Data retention | History disappears after a period |
| Number of team members | Blocks growth, not usage |
| Custom domain or branding | Visible to your customers |
| Rate limits per second | Fine at low volume, breaks at scale |
| Commercial use restrictions | Sometimes excluded entirely |
The bottom row is worth reading carefully. Some free tiers permit personal or evaluation use only, which makes production use a licence breach rather than a bargain.
Design for the transition
If the tool is genuinely useful, you will exceed the free tier. Build so that moving to a paid plan, or to a different tool, is a configuration change rather than a rewrite.
That mostly means keeping your own copy of the data and calling the service through a thin layer of your own code rather than scattering its specifics everywhere.
When free tiers are the right choice
Prototypes, internal tools, low-volume services and anything where an outage is inconvenient rather than costly. They are an excellent way to test whether something is worth paying for.
The judgement is about consequence rather than cost. If the thing breaking would cost real money, pay for it and get the support that comes with it.