2026-06-13 · 12 min read · Article

27 Principles of Viral Products

Curated from Marc Lou's viral X thread — essential reading for anyone building products people actually share. A practical audit checklist included.

The 27 Principles

1. No Free Plan

Free users are leeches. They increase support, server costs, and make you build features your paying customers don't want. Less than 3% of free users ever convert. Remove your free plan.

2. Three Colors Max

Every color fights for attention. The more colors you add, the less people notice what matters. Black text. White background. One color for the Buy button.

3. Numbers Over Adjectives

"Fast" is forgettable. "Save 4 hours every week" isn't. Quantify everything.

4. Footer People Want to Share

97% of visitors won't buy, but they might share. People remember what they see last. Finish strong.

5. OG Image = YouTube Thumbnail

"If they don't click, they don't watch." Your OG image is often seen more than your actual website. Design it like a YouTube thumbnail.

6. One Idea Per Screen

Don't try to say everything at once. One screen should communicate one idea and nothing else. One screen. One message. Just like the Instagram feed.

7. Fifth-Grade Headline

Complexity kills curiosity. Use simple words. Your mum should get it.

8. Hard Paywall

Signups don't pay the bills. If nobody is willing to pull out their credit card, you don't have validation. Ask for payment before asking for data.

9. Uncopyable Copy

If a competitor could copy-paste your landing page onto their website, your copy is too generic. Write from experience.

10. Show Before Tell

A demo communicates more than paragraphs of text. Show. Don't tell.

11. Do One Thing

The more things you do, the less people remember. People don't remember Swiss Army knives. They remember the tool that solved their problem. Be known for one thing.

12. Popcorn Pricing

Your visitors came to buy a product, not study a spreadsheet. Every pricing tier you add creates another decision and another reason to leave. Keep it to three choices: Good. Better. Best.

13. Ride a Wave

Build around trends, technologies, and problems people are already discussing. The wave does half the marketing for you.

14. Steal Copy From Customers

Customers already describe your product better than you do. Write like your customers talk.

15. Visible Founder

People buy from people. A screen recording from the founder beats a corporate promo video or a wall of features. Show your face.

16. Impossible-to-Miss Pricing

The pricing section is one of the first places visitors look. They use it to understand the product, not just the price. Put "Pricing" in the header.

17. Sticky Headline

Write five headlines. Show them to friends. Wait 24 hours and ask which one they remember. Keep the one that sticks.

18. Emotional Headline

People don't remember features. They remember feelings. Your headline should make people laugh, say wow, or think "what the fuck is this." Write for humans.

19. Do Something Never Seen Before

Nobody shares another clone. Surprise people.

20. Sell From Hero Alone

80% of visitors won't scroll past the hero. If they don't understand the product and want it within a few seconds, you've already lost. Fix the hero first.

21. Empathy Before Sales

Before people trust your solution, they need to believe you understand their problem. Describe the problem better than they can.

22. One Call to Action

Every extra button creates hesitation. When people have multiple paths, many choose none. Give people one next step. Just one.

23. Memorable Name

Use words people already know. Avoid wordplay, made-up words, and names that require explanation.

24. Sell Desire, Not Features

People buy more money, more time, better health, more status, or less pain. Features are just vehicles to get there. Sell the outcome, not the feature.

25. Try Before Buy

Don't hide your best features behind a paywall. Put them on the landing page. Let people play before they pay.

26. No Weak Words

"Most," "many," "rarely" weaken your message because nobody knows what they mean. Strong copy makes clear claims that people can picture, remember, and challenge. Make statements, not estimates.

27. No Subscription

People already pay for enough subscriptions. Charge once. Own forever.

Quick Audit Checklist

Use this to score any landing page (1 point each):

Score: ___/27

Source: Marc Lou (@marclou) on X · Curated for reference by Signal