What Makes a Good SaaS Idea? 8 Validation Criteria We Use at IdeaIndex

We've evaluated thousands of SaaS ideas to curate the 500 in our database. Along the way we built an internal rubric. Every idea gets scored against 8 criteria. Hit 6 of 8 and it's a candidate worth building. Hit fewer and the framing needs work before the idea is ready.

This is the same rubric, made public. Run your idea through it.

1. Recurring pain (not one-time pain)

SaaS makes money on subscriptions. Subscriptions only stick when the pain recurs. If your idea solves a problem your customer has once a year, you'll churn. If you solve a problem they have every week, the subscription is justified.

Recurring-pain examples: weekly content production, monthly accounting, daily customer support volume, continuous monitoring. One-time-pain examples: tax filing (mostly), legal document signing, business plan generation. (Notice one-time-pain tools either upsell to recurring use cases or operate on a transaction fee model, not pure subscription.)

2. Someone is already paying for a worse version

The single strongest validation signal: a budget line already exists for the problem. Maybe it's a freelancer, a consultant, an enterprise tool, or a spreadsheet that someone is maintaining for 4 hours a week.

New budget categories are 10x harder than redirecting existing budget. If your idea creates a new line item your customer's finance team has never approved before, you're selling against a NO by default.

3. The customer can buy without permission

SaaS pricing tiers map to who has authority. Tools under $50/month can be bought on a credit card by an individual contributor. Tools $50–$500 typically need manager approval. Tools $500+ need budget owner approval, sometimes procurement. Tools $5K+ need a sales cycle.

Each step up in approval requirement slows your sales cycle by 5–10x. If you're a first-time founder, target the "no permission needed" tier. That's where product-led growth works. Tally, Papermark, and AudioPen all live in this tier and grew to seven figures without sales teams.

4. The category is growing (or about to be)

Tailwinds make everything easier. A 30% YoY tailwind compounds into 2.2x growth over 3 years even if your execution is mediocre. A flat category requires you to steal share — a harder problem.

Check Google Trends for your category keywords. Check funding announcements. Check job postings for related roles. If all three are trending up, you have wind at your back. Ourtrends database tracks 45 emerging tailwinds with growth rates and opportunity scores.

5. You can build a working v1 in 4 weeks

Time-to-MVP is the single highest predictor of founder survival. If your v1 takes 6 months to ship, you're burning runway before you have customer feedback. Worse: you get attached to the v1, which makes you slow to pivot when the feedback comes back wrong.

Good SaaS ideas have a v1 you can ship in 4 weeks of focused work. The way to test this: write down the 5 features the v1 needs and estimate honestly. If the list is 15 features and 6 of them require infrastructure you don't have, the scope is wrong. Cut.

6. There's a credible wedge — not just a feature

A wedge is a position in the market your product can defend. A feature is just functionality. Wedges are usually combinations: [horizontal capability] × [vertical focus] or [established tool] + [specific gap].

Examples of wedges from our database:

• Plausible: web analytics × privacy-first × EU compliance
• Kit: email marketing × creator-specific workflows
• Papermark: document sharing × privacy/tracking
• Submagic: video captioning × TikTok/Reels-specific styles

Every one of those would be a feature inside a bigger competitor. As standalone wedges they became defensible businesses.

7. There's a clear distribution channel that doesn't require burning ad money

Ad-funded SaaS works if you have $500K+ to spend. Bootstrapped SaaS needs free or compounding distribution: SEO, content, community, integrations, virality.

Before you start, write down your distribution hypothesis. Is it SEO? Then your product needs content surface (templates, examples, programmatic pages). Is it integrations? Then your v1 needs to live inside Notion, Shopify, or whoever your customer already uses. Is it community? Then you need to be active in that community for 6 months before launching.

If you can't name one distribution channel that's free or compounding, the idea is harder than it looks. Browse our marketing playbooks for worked examples of distribution by channel.

8. You can articulate the "outrageous outcome" in one sentence

The headline test. If you can't describe the outcome your customer gets in one sentence that makes them think "wait, that's possible?", the positioning isn't sharp enough yet.

Bad headlines: "AI-powered scheduling for businesses." (mechanism, not outcome)

Good headlines: "Get back 4 hours a week of scheduling time, automatically." (specific outcome, real number, implied stakes)

Write 10 candidate headlines. Show them to 5 strangers in your target audience. Ask which one makes them want to know more. Use that one.

Scoring your idea

Give your idea 1 point for each criterion it clearly hits. Half a point if it's plausible but not certain. The breakdown:

• 7–8 points: Build it. Now. You won't get another idea this clean for a while.
• 5–6 points: Strong candidate. Rework the framing on the criteria you missed and re-score.
• 3–4 points: The kernel might be good but the version you're holding isn't. Pivot the framing or pick a different wedge.
• 0–2 points: Walk away. Save the year.

This rubric is intentionally strict. Most ideas score 3–4. That's normal. The process isn't about validating your favorite idea — it's about generating enough ideas that one of them scores 6+.