The calendar test for choosing a product idea

You have three product ideas in your notes: a guide about a subject you enjoy, a template for a task you keep doing, and a course based on questions people ask you every week. All three sound plausible. The useful question is not only which one interests you most. It is which problem appears often enough for a product to earn its place in someone’s calendar, budget and working habits.

Start with the problem’s natural rhythm

Write down the moment when a buyer would use your product. Be precise. “Learn about meal planning” is a subject. “Plan five weekday dinners before the supermarket trip” is a recurring moment. “Understand bookkeeping” is broad. “Reconcile transactions before sending the monthly figures” has a calendar attached to it.

Now estimate how often that moment occurs for one person. You do not need a survey to begin. Look at your own client work, support emails, repeated questions, calendar bookings, or the files you recreate. If you have served customers before, the repeated request is often better evidence than the topic you happen to be excited about.

1. 1Name the task or decision in one sentence.
2. 2Choose the customer’s natural interval: daily, weekly, monthly, quarterly, yearly or one-off.
3. 3List what goes wrong when the customer delays it.
4. 4Note what they use now: a spreadsheet, search results, a generic course, a person or nothing.
5. 5Choose the smallest product that makes the next occurrence easier.

Turn frequency into a product choice

Frequency changes what “useful” means. A one-off problem may reward a clear decision tool. A weekly problem may reward speed and reuse. A monthly problem may need reminders, fresh examples or a system that prevents the buyer from starting again each time.

These are starting points rather than rules. A weekly problem does not require a membership. If a well-made template removes the work permanently, a digital download may be the better offer. Equally, a one-off decision can support coaching when the consequences are serious and the buyer wants help applying the answer.

Run the calendar test before you build

For each idea, make a simple calendar. Put the customer’s likely use moments across a year. Then ask what your product does at each moment. If the answer is “they read it once”, that may be perfectly sound for a focused download. If the answer is “they return every Friday and the product saves them an hour”, you may have room for a reusable system or a higher-value offer.

Next, write the cost of ignoring the problem. This does not mean inventing a dramatic consequence. Use the ordinary cost: another blank page, another avoidable mistake, an unpaid invoice, a delayed launch or an hour spent rebuilding the same document. A frequent small inconvenience can be easier to sell than a rare large worry because the buyer recognises it immediately.

Compare ideas without trusting your enthusiasm

Score each idea from one to five on four questions: how often the problem occurs, how clearly you can describe the outcome, how much effort the current workaround takes, and how close you are to the customer. Add the scores, but keep the categories visible. A total is only useful when you can see why an idea received it.

Then test the strongest idea with a small promise. Offer one useful outcome, not a catalogue of everything you know. You might sell a repeatable spreadsheet, a short workshop or a set of templates before producing a large course. Store.fan can host several of these paths: you can start with digital downloads, or use online courses when the customer needs lessons and progression.

Use the result to shape the offer

If the problem is occasional, make the product easy to find and easy to finish. A clear title, a direct promise and a short path to the result matter more than adding extra chapters. If it is frequent, design for return visits: reusable files, examples, a routine, or a way to get feedback. If it is ongoing, be explicit about what changes over time. A recurring payment needs a recurring reason to stay.

Your delivery method should also match the work involved. Store.fan gives you a storefront at store.fan/yourname, and paid plans start with a 14-day trial. Store.fan takes 0% of sales; Stripe’s own processing fee still applies, and money goes straight to your own Stripe account. If you need to watch sales while moving between tasks, the iOS app provides instant sale alerts. For a product built around repeat contact, Pro adds tools such as email marketing, discount codes, hosted course video and creator-run affiliate programmes. You can review performance with built-in analytics rather than relying only on likes or clicks.