The Seasonal Challenge Engine: Reddit Mod Tools That Pay $3,500
Hobby subreddits run recurring challenges on sticky threads and spreadsheets. Reddit's Devvit platform pays $3,500 in install milestones to whoever automates that ritual first.
Platform Arbitrage
Startups leveraging under-priced attention or features on new platforms—TikTok, Shopify, Notion, X, or upcoming ecosystems. Focused on discovering early surfaces before they mature or saturate.
The Cashback Handcuff Keeping Plant Sellers on Palmstreet
Whatnot is worth $20 billion and a16z-backed Palmstreet pays top plant sellers cashback not to go live elsewhere. Exclusivity clauses mark where a customer relationship is turning portable.
The Workflow Layer Substack's Scheduler Left Behind ($11K MRR)
Substack shipped native Notes scheduling in April 2026 and WriteStack grew to $11,000 MRR anyway. The surviving business was never the scheduler. It was everything downstream of it.
The $15 Million Price Tag Nobody Verifies
Walmart finishes digital shelf labels across 4,600 stores this year. CPG brands route up to 27% of revenue through trade promotions and still verify execution by hand.
The $79 Weekend That Sells a $2,000 Camera
Independent camera stores already credit rental fees toward purchases on spreadsheets. Lumoid died building the marketplace version. The software layer that measures rental-to-purchase conversion is still unbuilt.
OptinMonster for Algorithms: The Publisher Tool Google Left Unbuilt
Google shipped an embeddable Preferred Sources button on August 20, 2026. Search referrals are down 33%, 600,000 sources are already selected, and the paid tooling around it does not exist.
The 75% Commission Heist: TikTok Shop's Refill Economics
TikTok Shop did $11.8 billion in six months, and a buried subscription rule means affiliate commission is paid once. The refill order is where the margin actually lives.
The Anti-SaaS Heist: 19,163 Contractors, One Downloadable File
ASHRAE charges $6,580 for a newsletter placement that averages 77 clicks. A verified local list of Texas HVAC contractors is a different asset, priced by different logic.
Restock or Discover: The Question 17,000 Shopify Apps Skip
Every Shopify personalization app profiles who the shopper is. A 2026 field study says why they came matters far more. Beauty merchants can test it in a week.
Square's 120-Day Dispute Window Meets a 30-Day Camera
Card networks give cardholders 120 days to dispute a payment. The camera above the counter often overwrites the footage in 30. Square merchants selling watches, repairs, and resale sit in the gap.
The Integrity Desk: $1.5M ARR in Academic Publishing's Long Tail
More than 110,000 papers published in 2025 carry AI-hallucinated citations. Enterprise integrity vendors are wiring up ScholarOne while 44,000 OJS journals screen submissions by hand.
GovDeals Sells $274M a Quarter. Nobody Prices the Cars.
Public fleet auctions are fully online and the sub-$15,000 used band is starved. Discovery is solved. The arithmetic between a GovDeals listing and a safe bid is not.
The Night Shift: CRM Reconciliation at $30K MRR
Batch inference is half price at every major lab, which makes it worthless as a business. The opening is what a RevOps agency finds finished in HubSpot at 7 AM.
The Second SKU: $105K MRR Hiding Inside Shopify's Charm Boom
Bag charm volume rose 12x in a year and Crocs clears $260 million from Jibbitz. Shopify's 495 customizer apps all miss the narrower job underneath.
The Decision Queue: $16K MRR Hiding Inside YouTube Studio
YouTube shipped AI comment search into Studio in June 2026 and deliberately stopped at retrieval. Creator ad spend hits $44 billion in 2026, and reputation is now the buying criterion.
The $20,000 Doorway: Selling Ops Software to Rival App Stores
Under the Epic v. Google injunction, Google Play now distributes rival Android app stores. Every licensed operator owes $20,000 a year and a compliance workload nobody has built software for.
The $74 Paint Kit Shopify Can't Assemble
Michaels' AI assistant fielded 75,000 conversations in weeks, most about projects rather than products. Shopify standardized product catalogs. Nobody has standardized project knowledge, and specialty retail will pay for it.
Pokémon's Back-Room Problem Is a $79-a-Month Shopify App
Seven-Eleven's July franchise scandal exposed a gap Shopify POS never covered: what happens to limited inventory between the receiving dock and the shelf. Trading card shops feel it first.
Crocs-Style Charms for the $150 Fan Europe Can't Stop Carrying
Shark's $149.99 ChillPill became Europe's summer status object, with TikTok Shop sales up 1,200%. Owners want theirs personalized, and nobody sells the attachment point Crocs proved is worth $271M.
The One-Question Widget: $44K MRR Hiding Inside AI Shopping Referrals
Shopify merchants see AI referral traffic from ChatGPT and Perplexity convert 50% better than search, with no idea what those shoppers were actually trying to buy.
The Airbnb Incident Recorder: $29 Reports for Panicked Hosts
Airbnb publishes its ranking factors but never confirms whether your listing appeared in a given search. Hosts edit blind, guess wrong, and blame shadowbans. Someone should be selling the logs.
CreativeOps for the App Store: The $25K MRR Coordination Layer
Apple's fall Creative Assets rollout splits App Store creative from app releases, leaving ASO agencies to coordinate 50 localizations and 70 custom product pages with no software built for it.
Book Before Feed: The iOS Blocker That Demands Proof
Screen-time blocking is a commodity, and a solo developer already shipped camera-verified unlocking to nine App Store ratings. The gap isn't engineering. It's owning a ritual people will film.
The $5,455 Song: YouTube Creator Music's Hidden Bill
YouTube stops selling Creator Music licenses on August 10, pushing editing teams toward revenue-share tracks. Nobody prices that decision before the cut is locked.