Owner versus your plan's tool allowance
Owner is the person accountable for one tool; the tool allowance is how many tools your plan lets you keep - two separate things that are easy to confuse.
Two similar-sounding ideas trip people up, so it is worth pinning them down. The Owner is a person you assign to a single tool. The tool allowance is a number - how many tools your whole plan lets you keep in the register. One is about accountability for a tool; the other is about the size of your estate.
Assigning an owner is optional and purely organisational. You pick someone from the people on your account, and from then on it is clear who looks after that renewal. Owners show up in the register and the dashboard, you can filter by owner, and it means a reminder or a decision has an obvious home. Changing or removing an owner never affects your allowance.
The tool allowance is set by your plan. Starter (the free plan) allows 10 tools, Team allows 25, and Growth allows 100. Scale and Business are unlimited. When you first sign up you get a 14-day trial on Growth terms, so you can track up to 100 tools while you try things out before settling on a plan.
The one rule that surprises people is how tools are counted. Every record on your account counts towards the allowance, whatever its status. A tool you have marked cancelled still counts. A tool you have archived still counts. StackTrackr treats them as retained assets so you keep their history, which means cancelling or archiving does not free up a slot.
So if you reach your limit, deleting a genuine tool to make room is usually the wrong move, because you lose its record for good. The right move is to upgrade to a plan with a higher allowance. When you hit the cap, StackTrackr tells you which plan comfortably fits the number of tools you are trying to keep.
Seats are a third thing again, and separate from both. Your plan includes a number of user seats - the people who can log in and share the register - and paid plans let you add more seats for a per-seat rate. That is about how many colleagues use StackTrackr, not how many tools you track or who owns each one.
In short: owner is per-tool and free to change, the tool allowance is the plan-wide cap that counts archived and cancelled tools too, and seats are how many people can use the account. Keeping the three straight makes it much easier to see when you genuinely need to upgrade.