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Kelly Risk Sizing SaaS for Bettors
Build a modern bankroll-sizing web app for serious sports bettors, poker players, and prediction-market traders. The product should go beyond basic Kelly calculators by modeling uncertainty, fractional Kelly, correlation, and bankroll drawdown scenarios so users can make safer repeated decisions.
Why this matters
You already know the headline formula, but using it in real life is uncomfortable. Your edge estimate is noisy, opportunities are uneven, and bets can move together in ways a simple calculator ignores. A basic input-output tool tells you one neat percentage, yet that number feels reckless when you are risking real bankroll. So you end up cutting the stake manually, using rough heuristics, or maintaining a spreadsheet that still does not show how bad a drawdown could get. What you want is software that turns theory into realistic sizing guidance under uncertainty, not a classroom formula pretending the world is clean.
- · Built for Independent bettors, poker grinders, and prediction-market participants who already place repeated wagers and want disciplined bankroll management..
- · Most likely monetization: SaaS subscription with freemium tier.
The Pain · Narrative
You already know the headline formula, but using it in real life is uncomfortable. Your edge estimate is noisy, opportunities are uneven, and bets can move together in ways a simple calculator ignores. A basic input-output tool tells you one neat percentage, yet that number feels reckless when you are risking real bankroll. So you end up cutting the stake manually, using rough heuristics, or maintaining a spreadsheet that still does not show how bad a drawdown could get. What you want is software that turns theory into realistic sizing guidance under uncertainty, not a classroom formula pretending the world is clean.
Score Breakdown
Market Signal
Go-to-Market
Active individual bettors and poker players placing multiple wagers per week who already track bankroll and use spreadsheets.
~100K-300K serious self-directed users globally
SEO long-tail
$29/month
25 paying users and 200 registered bankroll simulations within 30 days of launch
MVP Scope · 1–2 weeks
- Build a web calculator for full, half, and custom fractional Kelly inputs
- Add support for decimal and American odds conversion
- Implement bankroll simulation with 1,000 Monte Carlo runs
- Create simple charts for expected growth, drawdown, and ruin probability
- Set up landing page, email capture, and Stripe checkout
- Add confidence slider that shrinks stake sizing when edge certainty is low
- Implement multi-bet portfolio inputs with basic correlation assumptions
- Create saved scenarios and bankroll history per user
- Publish educational onboarding explaining probability versus payout inputs
- Launch content pages targeting long-tail search terms around Kelly and bankroll sizing
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Most users may be satisfied with free calculators if correlation and uncertainty features are not compelling enough.
- 2Acquiring gambling-adjacent users through paid channels may be difficult or expensive due to policy restrictions.
- 3If users do not trust the assumptions behind simulations, they may revert to their own spreadsheets or heuristics.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
The discussion repeatedly showed that users understand the basic idea but struggle with practical stake sizing when edge estimates are uncertain. Several comments highlighted assumptions that common tools ignore, including known odds, repeated opportunities, and uncorrelated bets. There were also references to self-built tools and legacy calculators, suggesting both demand and dissatisfaction with current solutions.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Build
Strong demand signals detected. Real pain, real willingness to pay — start building an MVP.
Landing Page Copy Kit
Ready-to-paste copy based on real Reddit community language — no editing required
Headline
Kelly Risk Sizing SaaS for Bettors
Sub-headline
Build a modern bankroll-sizing web app for serious sports bettors, poker players, and prediction-market traders. The product should go beyond basic Kelly calculators by modeling uncertainty, fractional Kelly, correlation, and bankroll drawdown scenarios so users can make safer repeated decisions.
Who It's For
For Independent bettors, poker grinders, and prediction-market participants who already place repeated wagers and want disciplined bankroll management.
Feature List
✓ Fractional Kelly calculator with confidence adjustment ✓ Monte Carlo bankroll simulator with drawdown and ruin metrics ✓ Correlated bet portfolio sizing ✓ Odds-format conversion and implied probability tools ✓ Saved strategies and bankroll journals
Where to Validate
Share your landing page in r/HN · front_page — that's exactly where these pain points were discovered.
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