A children's play room is the most common format in shopping malls: a ball pit, a slide, a maze, a counter with popcorn. And the most common way of tracking it is a notebook: the child's name, the time of arrival, the amount.
The notebook works while the owner stands at the counter in person. After that come losses that are almost impossible to spot afterwards. Let's look at exactly where they appear and what software gives instead of a notebook.

What gets lost in a notebook
- Undercounted minutes. The child arrived at 14:10 and left at 15:40 — it was written down as "an hour".
- Passes kept from memory. The client says three visits are left, and there is no way to check.
- Popcorn past the till. Small sales are not recorded at all: "we'll count it later".
- Shift handover. Who took the money in the middle of the day cannot be reconstructed by the evening.
Taken one by one, each trifle is the price of a single portion of popcorn. Over a month it adds up to a sum comparable with the rent of the spot in the mall. On the price of "free" bookkeeping there is a separate piece: "What 'Free' Notebook Bookkeeping Really Costs You".
Time spent: start, stop and an honest amount
The basis of tracking in a play room is time. The employee starts the visit at the entrance and finishes it at the exit; the amount is calculated from the fact, or taken immediately if the rate is per entry. No rounding "in favour of the venue" or "in favour of the guest" — both sides see the same figure.
The side effect is nicer than the tracking itself: the screen always shows how many children are inside right now. That answers both the safety question and the "is it time to put a second employee on the shift" question.
How this mode works is in the article "Time Tracking".
Passes and the client's balance
A pass in a play room is not a paper card with stamps but a balance tied to the client's phone number. The parent tops it up with any amount, and it is spent on visits and, if you allow it, on goods from the counter.
The benefit runs both ways: the client comes back because the money is already in, and the owner gets prepayment and stops arguing about how many visits are left. More on this in the piece "Client Balance".
Popcorn and drinks are a separate till
Side sales in a play room bring a visible share of the revenue and are almost never tracked. The problem is not the employee's greed but that a small sale is inconvenient to record: a queue, a crying child, and then it is forgotten.
The fix is to make a sale take two taps and to keep its till separate from the till for time. Then two sums are reconciled at the end of the day, and it is immediately clear which one did not add up. How it works is in the article "Not Just Rentals: Selling Side Products".
What the owner sees when they are not on site
The point of the software is not to replace the notebook but to make the owner's presence in the room unnecessary. The minimum set: revenue for the day by each stream, the discrepancy between the calculation and the till, who worked the shift and how much they handed over.
In RentOS this set arrives on its own — in the app and as a Telegram summary at the end of the day. The owner opens the phone in the evening and sees whether it added up; digging in is only needed when it did not.
Frequently asked questions
Will this suit a room in a mall with a single employee? Yes, the minimal scenario is one point, one zone counted by time and a counter with goods. Everything runs from the employee's phone (job ads often call this role a play room operator).
Do I need a computer and a cash register? A computer is not needed: the software runs from a phone or a tablet. Cash register hardware is connected separately if the law of your country requires it.
And if I have a play room, a trampoline park and ride-on cars at once? That is the normal case: each zone is counted by its own rules, and the revenue adds up into one till of the point. How it works is on the features page; prices and limits are on the pricing page.
Shift handover: who took the money
In a room with two shifts there is almost always a blind spot — the money taken in the middle of the day. If the till is shared, by the evening you cannot say whose shift did not add up, and the conversation turns into "probably not me".
The cure is that every employee works under their own login and submits their results separately. Then the discrepancy is tied to a person and to an interval of time rather than to the whole day. As a bonus you can see which employee sells more — the gap between people usually turns out to be wider than the gap between a weekday and a weekend.
How to choose the software: three questions
- Does it count time by itself? If the amount is typed in by hand, the mistakes will simply move from the notebook to the screen.
- Are goods separated from visits? Otherwise there is no way to tell where exactly the shortfall appeared.
- Does all of it run from a phone? In a room of twenty square metres there is no space for a computer at the counter.
And check the most common case during the demo: the child came for an hour, stayed for two, the parent pays the difference on the way out. If that scenario needs three screens and a calculator from the employee, it will not happen during a real shift.