Cardstock · B2C · sports card scanner app
Post your app idea in the hobby's subreddit before building it
10-15 people said they'd use it; later drove launch downloads
Workedvalidationcommunity
What they did
Before building, Kyle posted the idea (a baseball card cataloging/scanning app) in r/baseballcards, a fairly small subreddit, after seeing on Twitter that you should validate first. 10-15 people replied that they would use it. A Redditor later DMed him asking whether he was still building it, which got him to finish the unfinished app.
What happened
10-15 positive replies; gave enough validation to keep going, and a DM from one commenter got him to finish the app. The post was referenced in the launch post.
- Stage
- Pre-launch (pre-build)
Related topics
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More from Cardstock
All 16 Cardstock tactics- Rebuild your working app for a nearby hobby, built in a day with AI$17K MRR and 3,400 subscribers in a year; more new customers a month than the original
- Build the app you wanted for your own hobby when the App Store has noneGrew into ~$75K MRR over six years
- Give creators TikTok slideshow templates to post and pay them by viewsFounder calls it their biggest success; no numbers given
- Bring in friends for a three-way revenue split and teach them to codeTeam of three grew to five; revenue from a few hundred a month to ~$1.5M a year
- Post on Reddit when the app is finishedFirst downloads came almost immediately; no numbers
More from this episode
- Cardstock: Announce the launch in the same subreddit, linking your earlier idea post12 paid downloads (~$60) on launch day
- Cardstock: Make the app free to download and charge $5 a month instead of $4.99 onceBiggest revenue jump ever; growth took off from the 2021 switch
- Cardstock: Spend two weeks on keyword research, then put the best terms in your title#1 for 'baseball card scanner' for 2-3 years; ~$9-10K MRR with no marketing
- Cardstock: Post brand-style TikToks (memes, silent pack openings) on the app's accountFirst videos got ~23 likes; viral ones brought no downloads without the app on screen
- Cardstock: Film a valuable card, scan it with the app in hand, then reveal its priceFirst one hit 184K views; became the repeatable format behind the TikTok growth
- Cardstock: Hire a friend to figure out TikTok with you before paying an agencyFriend became the de facto CMO; knew enough to spot a good UGC agency later
- Cardstock: Show the paywall at first open, with a small hidden XMost subscriptions came from this first paywall, before people used the app
- Cardstock: Switch to a hard paywallRevenue reached ~$30K/month (alongside a Christmas TikTok spike)
- Scanemon: Put the app's name on the scanner screen so every video shows itFounder thinks it lifts conversion; no data yet
- Scanemon: Post card-collecting tips slideshows from an account with an AI-made girl avatarSeveral posts over 100K views; the format then scaled through paid creators
- Cardstock: Pay creators about $1 per 1,000 views to post your slideshow template~7,600 posts in a month for $2,600, about $1 CPM; biggest recent growth driver