GTM Sauce

Getting users

Virality and word-of-mouth tactics

Sharing loops, invites, watermarks and other ways apps got users to bring in more users. 154 tactics from 107 founder interviews.

Most founders built sharing into the product itself, through score cards, result screens, branded links and invite rewards, so each user showed the app to someone else. When the shared thing was visual or playful, spread was fast and large. Referral rewards gave mixed results, several viral hits never turned into revenue, and apps for parents or dating found that users would not share them.

Summary written 2026-09-29 from the tactics below. Figures are as founders stated them.

What worked, most detailed first

Cal AI · B2C · photo calorie tracking app

Really helped; got direct numbers and deals around talent agents

Message signed creators monthly: 'Do any of your friends want brand deals?' Pay ~$100-200 to the creator if a referred friend signs. Referred creators send a personal phone number, so you call the influencer directly, sometimes bypassing their management.

Workedcreator-opsreferral-program
The Superwall Podcast · 2026-08-26

GlamUp · B2C · AI makeup glow-up app

1.6M share/code requests; codes flooded TikTok comments; conversion barely dropped

After the (blurred) scan result, the paywall offers two buttons: 'View results' (-> paywall) or 'Invite 3 friends'. Inviting leads to a share-your-invite-code screen; results unlock free once 3 friends download, finish onboarding and redeem the code. Friends get no benefit beyond helping. Target users are 13-25 and don't want to pay, so they post codes in TikTok comment sections. Branch was used for attribution/referral links. Repeated on Sprout and the newest app.

Workedreferral-programproduct-virality
The Superwall Podcast · 2026-05-13

Supademo · B2B · interactive product demo maker

Onlookers saw the demos and signed up or asked for one; no numbers

Posted offers on Reddit and Indie Hackers to make free Supademos for founders: they posted their product URL, Joseph built an interactive demo of their product himself and replied in the thread with it, so they could sign up, duplicate the demo and use it right away. Doing it publicly meant people who hadn't commented saw all the demos, clicked them, and either asked for one or signed up to make their own. Repeated variations across many channels.

Workedcommunityproduct-virality
Starter Story · 2026-03-11

Lobby · B2C · drop-in video hangout app

Credited with more sharing and pulling in left-out friends; #1 in UK, Italy, Germany 3 months later

'Group Picture' inside Lobby's video hangouts: anyone presses a button, everyone sees a 3-2-1 countdown and their phone vibrates, and the app captures a boomerang of the whole group. The output is watermarked and gets shared to Snapchat and Instagram Stories. The button lights up every 5-10 minutes to hint it's time for a picture, and leaving a chat prompts a goodbye picture. It must be a shared moment everyone knows is coming (posing, silly faces), not a secret screenshot. Two effects: more sharing out, and friends who weren't in the hangout feel left out and join next time.

Workedproduct-viralityretention
The Superwall Podcast · 2026-01-13

SiteGPT · B2B · AI chatbot for websites

~90% of Google traffic, ~50K visits/month; $13K MRR with $0 ad spend

Built almost 50 free tools, each related to the main product so its users are likely SiteGPT customers (e.g. PDF-to-markdown converter, chatbot name generator). Each tool has a CTA below it pitching the main product in context, e.g. for a chat-with-PDF tool: 'You have tried chatting with one PDF. What if you can create a chatbot with all of your business content? Try SiteGPT.' New tools are built in under five minutes by telling Cursor to look at the existing free tools and create a similar one for a given keyword.

Workedseoproduct-virality
Starter Story · 2026-01-07

GlowUp · B2C · AI makeup try-on app

Viral video hit ~48M views; ~$12.5K sales and 60K downloads in a day

In the app: 'If you invite three friends, you'll get a free makeup look.' Viewers downloaded the app, saw they could share a code, then came back to the TikTok, rewatched it and posted their code (or asked for codes) in the comments. Non-payers kept returning to engage with the post, which boosted it in the algorithm. Combined with an anchor download link added at ~500K views.

Workedreferral-programorganic-short-video
Starter Story · 2025-12-17

NGL · B2C · anonymous messaging app

Core loop behind 150M monthly users; no step-level numbers

Onboarding takes 15-20 seconds and drops users on a two-step home screen: copy your link, then share. Share shows animated GIFs: tap the sticker button, tap the link sticker, add it to your story, frame it. NGL auto-creates a share image with the user's profile picture. Received messages can be answered by replying straight onto your Story, which spreads the link again.

Workedonboardingproduct-virality
The Superwall Podcast · 2025-08-18

Opal · B2C · screen time app

80% more users sent at least one invite

Existing program: invite 5 people and get a free year. Redesigned the referral screen to look better and added tiers: 5 invites = free year, 20 = lifetime subscription, 50 = special prize, shown as goals in a clear UI.

Workedreferral-program
Sub Club by RevenueCat · 2024-01-10

BoldVoice · B2C · accent coaching app

~100K people in Korea tried it the day after one investor posted it

Trained an in-house model that predicts a speaker's origin from ~10 seconds of speech and launched it as a separate web app (accentoracle.com): no download, no gate, no trial; record your voice and get results instantly, then get invited into the BoldVoice app. Shared it in the monthly investor update; a Korean angel investor posted it on Threads. After it spread, invested in accuracy and stability.

Workedproduct-viralityweb-to-app
Sub Club by RevenueCat · 2026-09-16

Savvy Navvy · navigation app for boats

Instructors send students to it first; founder says no numbers

Not an affiliate program and no kickbacks (instructors don't want to look like sales reps). Instructors get the app free and their students get a discount. The team works closely with them: webinars, collecting feedback, instructors as beta users who get every new feature first. Built instructor-requested features, e.g. an in-app three-point fix for when GPS fails, which no competing app has. Signed American Sailing for the US. Similar programs with chandleries/boat shops, using in-store presence and QR codes.

Workedpartnershipsword-of-mouth
Sub Club by RevenueCat · 2026-08-05

Simply Draw · B2C · drawing lessons app for kids

Raised ARPU; parents share results on Instagram; no numbers

During the first-time user experience in Simply Draw, AI animates the drawing the child just finished. Kids run to show parents, who see the app as positive screen time worth paying for.

Workedonboardingproduct-activation
Sub Club by RevenueCat · 2026-06-24

Nancy Anderson Fit · B2C · fitness programs brand

100 signups in month one, 125 in month two; kept growing

Launched the first digital program in January (New Year's) as a 30-day group challenge: day-1 and day-30 photos, prize (~$100) for the winner, daily coaching in a Facebook group. Repeated monthly (Feb, March...). Used participants' before/after photos as organic marketing to a ~5K-follower Instagram. No paid media for years; growth spread by word of mouth.

Workedcommunityorganic-social
Sub Club by RevenueCat · 2026-05-27

What didn't work, or only partly

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The week's founder interviews, boiled down to what they did and what happened.

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