Both. You choose the billing cycle that suits you, and you can pick it when you subscribe.
Monthly billing charges the plan total you configured, once a month. It is the most flexible option if your tenant count moves around.
Annual billing charges 11 months instead of 12 — the twelfth month is free. In other words, you pay your monthly total × 11 for a full year of service, and the saving is equal to one month's subscription.
For example, a plan that costs RM484 per month comes to RM5,324 for the year on annual billing, rather than RM5,808 — a saving of RM484.
The Starter plan is free on either basis, so the billing cycle only matters once you move to Pro or Max