ModLens — Roblox Game Analytics That Actually Tell You Why Players Leave
Roblox developers earn real money via DevEx but fly blind on player drop-off — the built-in analytics are laughably basic. ModLens is a Lua SDK you drop into any Roblox game to get session funnels, event tracking, and churn heatmaps in a real dashboard, not a Roblox Studio pie chart.
Difficulty
intermediate
Category
Game Modding & Extensions
Market Demand
High
Revenue Score
7/10
Platform
Web App
Vibe Code Friendly
No
Hackathon Score
🏆 7/10
What is it?
Roblox has over 70 million daily active users and a $500M+ DevEx payout history, yet its native analytics cannot tell you which room players quit in or why they stop returning. ModLens is a lightweight Lua SDK (under 200 lines) that game developers drop into their Roblox experience to emit session events to an external dashboard via HTTPService. The dashboard shows player funnels, session length distributions, and event heatmaps on a real web app. Target audience: the estimated 2 million active Roblox game developers, especially the 50,000 who earn over $100/month via DevEx and have real incentive to optimize retention. Buildable in 2 weeks: Roblox HTTPService can POST to any external endpoint, the SDK is just Lua event emitters, and the dashboard is standard Next.js + Recharts.
Why now?
Roblox expanded HTTPService outbound limits in 2024, making reliable external event emission feasible for the first time without workarounds. The DevEx payout growth in 2025 means developers now have real revenue to protect and optimize.
- ▸Drop-in Lua SDK under 200 lines that emits session start, event, and quit signals via Roblox HTTPService.
- ▸Real-time event dashboard with session funnel visualization and drop-off percentages per stage.
- ▸Retention curve showing Day 1, Day 7, and Day 30 return rates per game.
- ▸Event heatmap overlay on custom game maps uploaded as PNG.
Target Audience
Roblox game developers earning via DevEx, approximately 50,000 active monetizing developers on the platform.
Example Use Case
A Roblox developer earning $800/month via DevEx installs ModLens in 10 minutes, discovers 60% of players quit on Level 3, shortens the level, and sees session length increase by 40% within a week.
User Stories
- ▸As a Roblox developer, I want to see which game stage players quit at, so that I can fix the drop-off point and increase session length.
- ▸As a monetizing Roblox creator, I want to see Day 7 retention rates, so that I know if my update improved player return rates.
- ▸As a game developer, I want to install the SDK in under 10 minutes, so that I do not waste a day on setup.
Done When
- ✓SDK Install: done when developer copies ModLens.lua into Roblox Studio ServerScriptService and sees test events appear in dashboard within 60 seconds of playtest.
- ✓Funnel Chart: done when dashboard shows at least 3 custom event stages with player counts and drop-off percentages between each stage.
- ✓Retention Curve: done when dashboard shows Day 1 and Day 7 return rate percentages for the past 30 days of sessions.
- ✓Free Tier Gate: done when a game exceeding 10,000 monthly events sees an upgrade prompt and new events are paused until Pro checkout completes.
Is it worth building?
$29/month x 100 developers = $2,900 MRR at month 3. Realistic: 100 paying developers at $29/month acquired via Roblox DevForum and YouTube tutorials at 4% conversion.
Unit Economics
CAC: $10 via DevForum organic posts. LTV: $348 (12 months at $29/month). Payback: 1 month. Gross margin: 90%.
Business Model
SaaS subscription
Monetization Path
Free tier: 10,000 events/month. Pro at $29/month: unlimited events, funnel builder, retention curves.
Revenue Timeline
First dollar: week 2 via DevForum beta. $1k MRR: month 3. $5k MRR: month 9.
Estimated Monthly Cost
Vercel: $20, Supabase: $25 (event storage scales with usage), Stripe fees: ~$10. Total: ~$55/month at launch.
Profit Potential
Side income to full-time viable at $3k–$10k MRR targeting the monetizing developer tier.
Scalability
High — can expand to A/B testing for game mechanics, player cohort analysis, and a marketplace SDK listing.
Success Metrics
Week 2: 20 SDK installs. Month 1: 15 paid developers. Month 3: 80 paid.
Launch & Validation Plan
Post SDK beta in Roblox DevForum with a free dashboard offer. Validate HTTPService compatibility with 10 real games before building the full dashboard.
Customer Acquisition Strategy
First customer: post free beta thread on Roblox Developer Forum offering dashboard access in exchange for feedback. Ongoing: YouTube tutorial showing SDK install in under 5 minutes, DevForum show-and-tell posts, Twitter/X Roblox dev community.
What's the competition?
Competition Level
Low
Similar Products
Roblox native analytics (no funnel or retention, basic only), GameAnalytics (not Roblox-native, complex setup), Amplitude (enterprise pricing, no Lua SDK). ModLens fills the gap: Roblox-native SDK with a real retention dashboard at $29/month.
Competitive Advantage
First external analytics SDK purpose-built for Roblox, real funnel visualization vs. Roblox native pie charts, no Roblox Marketplace cut on subscriptions.
Regulatory Risks
Roblox Terms of Service allow HTTPService for data collection but prohibit collecting PII on users under 13 — store only anonymous UserId hashes, never usernames or ages. COPPA compliance required.
What's the roadmap?
Feature Roadmap
V1 (launch): Lua SDK, funnel chart, retention curve, Stripe gate. V2 (month 2-3): custom event schemas, heatmap PNG overlay, email alerts on drop-off spike. V3 (month 4+): A/B testing for game mechanics, team seats, cohort analysis.
Milestone Plan
Phase 1 (Week 1-2): SDK and event ingestion working end-to-end. Phase 2 (Week 2-3): funnel and retention charts live, Stripe billing. Phase 3 (Month 2): 15 paid developers, DevForum launch post.
How do you build it?
Tech Stack
Lua SDK for Roblox, Next.js dashboard, Supabase for event storage, Stripe — build with Cursor for the Next.js dashboard, write Lua SDK manually in Roblox Studio.
Suggested Frameworks
Roblox HTTPService, Roblox Studio Lua API, Recharts for dashboard charts
Time to Ship
2 weeks
Required Skills
Lua scripting in Roblox Studio, Next.js, Supabase event ingestion, Recharts.
Resources
Roblox Developer Hub HTTPService docs, Roblox Studio Lua API reference, Supabase row insert docs.
MVP Scope
roblox-sdk/ModLens.lua (Lua event emitter SDK), app/page.tsx (landing page), app/dashboard/[gameId]/page.tsx (analytics dashboard), app/api/events/route.ts (event ingestion endpoint), app/api/checkout/route.ts (Stripe session), lib/db/schema.ts (Supabase events and games tables), components/FunnelChart.tsx (Recharts funnel), components/RetentionChart.tsx (Recharts retention curve), .env.example (API keys), README.md (Roblox Studio install guide).
Core User Journey
Copy SDK into Roblox Studio -> publish game -> see first events in dashboard within 10 minutes -> identify drop-off stage -> upgrade for retention curves.
Architecture Pattern
Roblox game server runs ModLens.lua -> HTTPService POSTs events to /api/events -> Supabase stores events -> Next.js dashboard queries and renders funnels -> Stripe gates Pro features.
Data Model
Game has many Sessions. Session has many Events. Event has gameId, sessionId, eventName, timestamp, metadata. Game has one Subscription.
Integration Points
Roblox HTTPService for event emission, Supabase for event storage and querying, Stripe for payments, Vercel for hosting, Recharts for dashboard visualization.
V1 Scope Boundaries
V1 excludes: A/B testing, custom event schemas, mobile SDK, white-label, team seats, Roblox Marketplace SDK listing.
Success Definition
A Roblox developer installs the SDK, sees their player drop-off funnel, makes a game change, and renews because retention improved.
Challenges
Roblox HTTPService requires game servers to have outbound HTTP enabled — some older Roblox games have this disabled by default and developers may not know how to enable it. Distribution relies entirely on Roblox DevForum trust and YouTube tutorials, not ProductHunt.
Avoid These Pitfalls
Do not store Roblox usernames or ages — COPPA violations kill the product overnight. Do not build heatmap overlay before funnel chart is validated — funnel is the core value. Finding first 10 paying developers requires genuine DevForum participation, not cold outreach — budget 2 weeks of community engagement.
Security Requirements
API key auth on /api/events endpoint, Supabase RLS on game and event tables, anonymous UserId hashing (no PII stored), rate limit 1,000 events/min per game, COPPA: no username or age data ever stored.
Infrastructure Plan
Vercel for Next.js, Supabase for Postgres event storage, no file storage in V1, GitHub Actions for CI, Sentry for errors. Total: ~$55/month.
Performance Targets
200 DAU at month 2, event ingestion under 200ms per POST, dashboard load under 2s, Supabase indexed on gameId and timestamp for fast funnel queries.
Go-Live Checklist
- ☐Security audit complete.
- ☐Payment flow tested end-to-end.
- ☐Error tracking (Sentry) live.
- ☐Monitoring dashboard configured.
- ☐Custom domain set up with SSL.
- ☐Privacy policy and terms published.
- ☐10+ Roblox developer beta testers signed off.
- ☐Rollback plan documented.
- ☐DevForum and Twitter launch posts drafted.
First Run Experience
On first run: a seeded demo game called 'ObstacleCourse' is pre-loaded with 7 days of fake session events. User can immediately explore the funnel chart and retention curve. No manual config required: demo game data is seeded in Supabase, no Roblox game connection needed to explore the dashboard.
How to build it, step by step
1. Define event schema: gameId, sessionId, eventName, timestamp, metadata in Supabase. 2. Write ModLens.lua Lua SDK with session tracking and HTTPService POST logic in Roblox Studio. 3. Build /api/events POST endpoint with API key auth and Supabase insert. 4. Scaffold Next.js dashboard and install Recharts. 5. Build FunnelChart component showing event stage drop-off using Recharts. 6. Build RetentionChart showing Day 1/7/30 return rates from session data. 7. Add game registration flow generating a unique API key per game. 8. Add Stripe Checkout with free tier event limit gate. 9. Write README with step-by-step Roblox Studio install guide with screenshots. 10. Verify: install SDK in a test Roblox game, publish it, trigger events in-game, confirm they appear in dashboard funnel within 30 seconds.
Generated
May 8, 2026
Model
claude-sonnet-4-6
Disclaimer: Ideas on this site are AI-generated and may contain inaccuracies. Revenue estimates, market demand figures, and financial projections are illustrative assumptions only — not financial advice. Do your own research before making any business or investment decisions. Technology availability, pricing, and market conditions change rapidly; always verify details independently.