You've got a table of contents written out, a folder full of notes, and another draft of the first chapter. But "stop writing for the drawer. How to test demand for an e-book" doesn't mean: polish your manuscript for another three months. It means: check if anyone is actually willing to pay for the results you promise before you commit any more evenings to the project.
An author's most expensive mistake isn't a poor content or a too-small advertising budget. It's creating a product blindly. You can write 120 pages of excellent information, only to hear silence because your audience wanted a solution to a different problem, a shorter format, or a specific supplement. Demand isn't confirmed by the hearts under the post. It's confirmed by clicks, signups, and, above all, payments.
What exactly do you test before writing an e-book?
You're not testing whether people "like the topic." You're testing three things: whether the problem is urgent, whether your promise is clear, and whether the price doesn't hold back a decision. These are three separate questions, so don't mix them into one disjointed message.
Example: An e-book about Notion for freelancers is the topic. "In 90 minutes, you'll build a system in Notion that tracks leads, deadlines, and payments" is a promise. Only such a promise gives the recipient a reason to click and leave a contact or money.
If you're a language teacher, don't sell an "English e-book." Sell a plan for a specific outcome, like 30 ready-made job interview answers in English. If you're a trainer, instead of a "diet guide," try "21 quick dinners under 550 kcal for people who get home after 7:00 PM." Precision doesn't limit the market. It allows the right people to recognize themselves in your offering.
Start with conversations, but don't end with opinions
Choose 10 people who fall into your target audience and write to them directly. Don't ask, "Would you buy an e-book?" This question generates polite responses, not data. Ask what they've struggled with recently, what they've already tried, and how much time or money it cost them.
The message could be as simple as: "I'm creating content for aspiring graphic designers who want to quote projects faster. What do you most often get stuck with when pricing: the rate, the client conversation, or the scope of work?" After the response, ask about a specific situation from the last 30 days.
You're looking for repeatable phrases. When five people say, "I don't know what to reply to when a customer asks for a discount," you have material for a chapter, a checklist, and a sales page headline. When everyone talks about the problem, but no one provides examples or has attempted to solve it, the urgency may be too low.
Build a test offer, not a full product
Based on your conversations, prepare a simple offer page. You don't need a ready-made file. You need a clear message: who the material is for, what the result will be, what exactly will be included, when it will be delivered, and how much it will cost.
Show a chapter plan, a single-page excerpt, or a template screenshot. Add a specific release date, for example, in 14 days. This offer is fair as long as you openly communicate the pre-sale and access date. The recipient isn't buying "maybe someday." They're buying a defined outcome within a specific timeframe.
Don't hide the price until the end of the test. The price is part of the test. If you collect 200 signups with a priceless message, and then no one buys at 79 PLN, you don't have confirmed demand. You have confirmed interest in free content.
Choose a test that gives a financial signal
The most powerful test is pre-selling. Set a lower price for the first batch, for example, 49 PLN instead of the planned 79 PLN, and limit it by time or number of seats. This isn't to create artificial pressure, but to give the recipient a real reason to make a decision now.
If you don't want to accept payment until the material is finished, start a priority list. Ask for an email address in exchange for a specific bonus: the first chapter, a spreadsheet, 10 ready-made prompts, or a mini-audit. A subscription alone is a weaker signal than a purchase, but it allows you to compare options without significant costs.
Test a maximum of two messages. One could emphasize time savings, the other revenue growth. For an e-book about service offerings, these could be: "send a quote in 20 minutes" and "increase the value of orders without negotiating an hourly rate." Send both variants to a similarly sized group. Don't change the price, graphics, recipients, or text simultaneously—then you won't know which worked.
To distribute the test, use your list, followers, and direct messages. If you don't already have them, reach out to five micro-influencers or newsletter authors in the same niche. Offer a specific commission for the sale and a ready-made product description. The affiliate shouldn't manually count clicks or ask if the sale was attributed. The affiliate mechanism should record the source of the transaction, calculate the commission, and show the results to both parties.
Numbers that tell you what to do next
You don't need a thousand visits to draw a conclusion. You need a sufficiently clear signal. If 50 relevant people see the offer and three buy a pre-order, the topic deserves further work. If 300 people click but none proceed to payment, the problem most often lies with the promise, price, or trust—not necessarily with the topic itself.
Look at the entire funnel. Many visits and few button clicks mean your headline or offer isn't hitting the mark. Clicks to purchase without finalizing payment can mean the price is surprising, the checkout process is too long, or the recipient doesn't know what they're getting. Purchases from one channel and silence from another tell you where the customer's willingness to pay lies.
Set a simple boundary before launch. For example, "I write the full version if I get 15 paid orders in 10 days" or "I expand on the topic if 8 percent of visitors sign up for the priority list." This will prevent you from biasing your interpretation after the fact to suit your emotions.
If the test doesn't sell, don't throw away the whole idea
A lack of purchases doesn't always mean you have the wrong topic. It could mean your audience is too broad. "E-book for creators" is vague, but "Canva template launch checklist for educators" gives you a concrete starting point.
Sometimes the format is the problem. A recipient might not want to read 80 pages about automation, but rather pay for a package of ready-made scenarios, files, and short implementation instructions. Other times, the offer meets a need, but the price is too high for the level of trust. In such cases, instead of cutting value, create a smaller entry-level product that leads to a larger e-book or course.
Don't fix everything at once. Change one variable: the target audience, the promise, the format, or the price. Run another test with a fresh audience segment. This is cheaper than rewriting a product that the market still doesn't understand.
Stop Writing for the Drawer - Build Sales Before You Finish Your File
Once the first payments arrive, the pace of work changes immediately. You're no longer building based on assumptions. You have customers, their language, their questions, and financial proof that the direction makes sense. You can even send buyers a short survey with their choice of three add-ons and choose the one that wins. This is how you build a product that people want to recommend.
Also, take care of the sales mechanics from the outset. The buyer should pay for the product, receive the sales document, and immediately download the file without any manual intervention on your part. If you invite partners, the commission must be calculated automatically. With NetBiznes FlowHub, you can run such a test without a fixed subscription, take advantage of analytics, automatic file delivery , and sell in PLN, EUR, or USD. This is crucial when foreign customers start buying your Polish e-book, and you don't want to turn growth into administration.
It's your turn to make a move: choose one problem, write a one-page offer, and show it to 50 relevant people within the next seven days. Sign up, take advantage of the promotional period with reduced commission, and let the market evaluate your idea with payment, not a polite "sounds great."