How to pick your first SaaS idea: a scoring method for choosing between three

What should a first SaaS idea look like?

A first SaaS product is not a platform. It is one workflow, for one kind of buyer, that people pay for every month because the need comes back every month. Invoices go out monthly. Reports are due monthly. Bookings arrive daily. If the problem occurs once, you are selling a one-off tool, and you need a new customer each time.

Three features make a first idea easier than most:

• A narrow buyer you can name and reach. You know where ten of them gather online or can get an introduction.
• A task that repeats. The product earns its place again on each use, which is what justifies a subscription.
• A first version one person can build. If it needs integrations with six systems before it is useful, shrink the scope. How to scope an MVP shows how.

If you are still collecting candidates, read how to find a startup idea first, or browse micro-SaaS ideas and SaaS ideas for solo founders to see the range.

Which criteria should you score a SaaS idea on?

Use six criteria. Each one maps to a way first SaaS products stall: nobody to sell to, nobody who cares, nobody who pays, too much to build, no repeat use, or a founder who loses interest. Score each from 1 (weak) to 5 (strong), based on evidence you have, not on how you feel about the idea.

The weights reflect a judgement, not data: that a first product is more likely to stall on reaching a buyer who has money and a reason than on the building. Change the weights if you have a strong reason, but fix them before you score, so the numbers do not drift toward the idea you already like.

What does the scoring look like on three candidates?

Here is a hypothetical example. A founder who used to work at a property management company has three candidates. The scores are invented for illustration only.

Idea C wins because the founder knows property managers, who already pay for inspection software. Idea B is the easiest build but has no clear buyer and no budget. The lesson is in the weights: the simplest build lost to the idea with a reachable payer. A score is a prompt to look at your evidence, not a verdict, so if a total surprises you, ask which criterion you scored from hope.

How do you get honest scores instead of guesses?

Spend two days gathering evidence before you score. For each candidate, do the same five checks so the comparison is fair.

1. Count buyers you can reach. Name the community, list or contacts. Write down the number you can message today.
2. Collect three problem stories. Short messages or calls where the buyer describes the last time it happened.
3. Find the current spend. What tool or person does it now, and what does it cost? Pricing pages and job postings both show this.
4. Sketch the first version in one paragraph. List every integration and every screen. If the list is long, score the build 1 or 2.
5. Ask how often it happens. Daily, weekly, monthly, yearly. Convert to uses per customer per month.

Mark anything you could not check as a 1 and write “unknown” beside it. That penalizes ideas you have not investigated, which is correct: an unchecked assumption has the same practical risk as a bad one. The app idea validation planner gives you interview questions for the pain and budget checks, and the micro SaaS idea finder can suggest candidates if you are short of a third.

What if two ideas score almost the same?

When totals are within a few points, do not agonize. The scoring has done its work: both are plausible. Use these tie-breakers, in order:

• Which one can you test faster? A test that takes three days beats one that takes three weeks.
• Which has the clearer first price? If you can name a price and a buyer’s reaction, you can learn faster.
• Which uses something you already know? Domain knowledge shortens both selling and building.
• Which has less regulatory weight? Avoid areas where you need legal or compliance expertise before the first sale.

If still tied, flip a coin and test one for two weeks. You will learn more from that than from a third round of scoring. Nothing stops you from returning to the other after the test.

How do you test the winning idea before building?

Run a test where the buyer risks something small: time, a deposit, or a commitment. A landing page with a clear promise and a waiting list proves less than a booked call. A booked call proves less than a prepaid pilot. Pick the strongest test you can run in about two weeks.

Idea: [name]
Buyer: [role and type]
Test: [e.g. ten outreach messages and five calls, then a paid pilot offer]
Pass: at least [number] buyers agree to a paid pilot or deposit at [price]
Partial: [number] buyers say yes but at a lower price or with a different scope
Fail: fewer than [number] commit, or the same objection appears three times
Decision date: [date]

On pass, write the build prompt and scope the first version. The guide on writing an app build prompt covers the brief an AI coding tool needs. On fail, go to the runner-up. When you decide on a price for the pilot, see how to price a micro SaaS.

If you scored an idea well but do not want to build it, post it on the board so another builder can try. Posting is free and needs no account, but it is permanent, so leave out anything you would later want back.

Which mistakes distort the scoring most?

• Scoring your own enthusiasm as pain. Pain belongs to the buyer. Only their stories count.
• Treating competitors as a bad sign. An existing tool with paying customers is evidence of budget. Look for a narrower buyer or a worse-served workflow.
• Scoring the dream version. Score the first version, not the product you imagine in two years.
• Changing weights after seeing totals. Fix them first.
• Skipping the test because the score is high. A total is a ranking of guesses until a buyer pays or commits.