Why APR Intelligence matters

A £15 monthly subscription costs £180 a year. That is true only if you pay for it with money you already have.

If it is charged to a credit card that carries a balance from month to month, the subscription is not £15. It is £15 plus interest, compounding, for as long as the balance persists. On a card at 24.9% APR, a year of that subscription costs closer to £200 — and if the balance is never cleared, the cost keeps accruing long after you have stopped using the service.

Why nobody notices

Interest does not arrive as a line item next to Netflix. It arrives as one number at the bottom of a statement, detached from the individual purchases that produced it. The subscription looks like £15 because that is the figure on the transaction, and the £4 of interest it generated over the following year is invisible.

This is precisely the kind of cost that behavioural design hides well: small, deferred, aggregated, and separated from the decision that caused it.

What APR Intelligence does

APR Intelligence reattaches interest to the thing that caused it. You tell Flowarden the APR on each card. Flowarden already knows which subscriptions are charged to which connection. From that it calculates:

• The effective annual cost of each subscription, including its share of interest.
• How much of your recurring spend is interest rather than service.
• Which subscriptions to move off the credit card, or cancel first, for the biggest reduction in interest paid.

The ordering changes

This is the part that surprises people. Sort your subscriptions by headline price and you get one list. Sort by effective annual cost and you often get a different one: a cheap service on a high-APR card can outrank a more expensive service paid from a current account.

If you are prioritising what to cut, that reordering is the whole point. Cutting the £30 subscription paid from a debit account saves £360. Cutting the £22 subscription paid on a card at 29.9% saves more than its face value suggests, and reduces a balance that is compounding against you.

Two caveats

First, this is a model, not a statement of account. Real interest depends on your issuer's calculation method, statement timing, and how much you repay. Use it to prioritise, not to reconcile.

Second, the fastest way to make APR Intelligence irrelevant is to stop paying subscriptions from a revolving balance at all. Move recurring charges to a current account, and the interest question disappears. Until then, at least know what the subscriptions actually cost.