Why I Built Lemmi Studio
Because App Store Screenshots Are the Worst Part of Launching
TL;DR: I spent 3 days designing screenshots for my last app launch. It should've taken 15 minutes. So I built Lemmi Studio—an AI tool that generates App Store screenshots, marketing copy, and landing pages automatically.
The Problem Every mobile Developer Faces 😫
You've just spent 3 months building your app. The code is clean. The features work. You're ready to ship.
Then you hit the wall: marketing assets.
Sound familiar?
What You Actually Need 📋
- 10 polished App Store screenshots (1200×2600px, device-framed)
- App Store copy (title, subtitle, description, keywords)
- A landing page
- Everything optimized for ASO
The Problem? You Can't Design 🎨
Or write marketing copy. Or build marketing sites.
Your "Options" 🤔
- Hire a designer → $500-1,000 + wait 1-2 weeks
- Learn Figma yourself → 20+ hours of tutorials
- Use Canva → still 4-6 hours per app
- Ship with ugly screenshots → tank your conversion rate
Spoiler: None of these are good if you're a solo developer shipping fast.
I know because I've launched a few apps. Every single launch, this was the bottleneck.
The Solution I Wish Existed 💡
After my last launch (where I spent 3 days in Figma), I sketched out my dream tool:
The Perfect Tool Would: ✨
- ✅ Take my raw iPhone screenshots
- ✅ Generate professional device-framed marketing images
- ✅ Write all the App Store copy (optimized for ASO)
- ✅ Build a landing page
- ✅ Do it all in under 15 minutes
- ✅ Cost less than one designer hour
That tool didn't exist.
So I built it 🤓
Meet Lemmi Studio 🚀
Your AI-powered go-live kit for app launches.
Upload screenshots → Get complete marketing assets in 15 minutes.
Here's What It Does 💪
1. AI-Generated App Store Copy 📝
- Title & subtitle (optimized for 30-char limits)
- Promotional text (170-char hook)
- Full description (ASO-optimized)
- Keywords
- Screenshot captions
Real-time character counters ensure you never exceed Apple/Google limits.
2. Professional Marketing Screenshots 🎨
- Device frames (iPhone, iPad)
- Gradient backgrounds (auto-extracted from your app colors or custom)
- Typography overlays (10+ professional fonts)
- App Store–ready sizes (1290×2796 for 6.7" displays, 1242×2688 for 6.5")
3. Visual Canvas Editor ✨
- Multi-screenshot editing workspace
- Drag-and-drop customization
- Change backgrounds, fonts, colors
- Upload custom graphics and logos
- Live preview with zoom (25%-200%)
- Auto-save
4. Landing Page Generator 🚀
- Complete static website (HTML/CSS/JS)
- Hero section, features, FAQ, CTA
- Fully responsive
- SEO-ready with meta tags
- One-click export as ZIP
5. Multi-Language Support 🌍
- Generate everything in 6+ languages
- English, French, Spanish, German, Italian, Polish
- All features work in every language
How It Works (The 15-Minute Process) ⚡
Step 1: Upload Your Screenshots ⏱️ 2 min
Drag in up to 10 raw screenshots. Lemmi automatically detects device type and validates orientation.
Step 2: Let AI Do Its Magic ⏱️ 3 min
AI analyzes your screenshots and generates:
- ✅ All App Store copy fields
- ✅ Device-framed marketing images with backgrounds
- ✅ Landing page content
Step 3: Fine-Tune in Studio Editor ⏱️ 5-10 min
Visual canvas editor lets you customize everything:
- Edit text overlays
- Change gradient backgrounds (8 directions: top-to-bottom, diagonal, radial)
- Upload your logo
- Adjust fonts and colors
- Add custom graphics
Customize everything visually—no code required.
Step 4: Export & Ship ⏱️ 1 min
Download everything as organized ZIP files:
- 📱 Marketing images → upload directly to App Store Connect
- 🌐 Landing page → download ZIP package and host anywhere (Netlify, Vercel, etc.)
- ✅ All organized and ready to use
⏱️ Total time: 15 minutes from upload to ready-to-ship.
The Tech Stack
Frontend:
- Next.js 15 (App Router) for Landing Page
- React
- TypeScript
- Shadcn styled components
- Fabric.js for canvas editor
Backend:
- Express.js
- Supabase (PostgreSQL + Auth + Storage)
- Google Gemini for content generation
- Prisma ORM
Infrastructure:
- Vercel, Railway for hosting
- Stripe for billing
Why these choices:
- Next.js: Fast iteration, great DX, built-in API routes
- Supabase: PostgreSQL + Auth + Storage in one, generous free tier
- Gemini-2.5-flash: Best at maintaining context across multiple copy fields, perfect multi-modal support
- Canvas: Battle-tested JS framework for complex client-side editing
Pricing (No Surprises) 💰
🆓 Free Tier
- 10 credits for totally free
- 3 projects
- All core features
Perfect for: Trying it out or launching 1 app/month
💎 Indie — $9.99/month
- 50 AI credits/month
- 20 projects
- Priority support
Perfect for: Solo developers shipping regularly
🚀 Studio — $29.99/month
- 150 AI credits/month
- 50 projects
- Team features
Perfect for: Small teams or agencies
What's a Credit? 🎟️
Think of credits like tokens:
- 1 credit = Generate one App Store copy field
- 1 credit = Generate one marketing image
- 2 credits = Generate complete landing page
Pro tip: Add-on packs available (100 credits for $5, never expire)
Why This Pricing? 🤷♂️
Simple: It's way cheaper than hiring a designer ($500+) but sustainable enough to keep building features you'll actually use.
Lessons Learned Building This 📚
💡 Lesson 1: AI Is Great at Marketing Copy (If You Prompt Right)
Early versions generated generic, buzzword-filled copy that sounded like every other app.
The breakthrough? Feeding the AI actual screenshot images + app context. Now it writes copy that describes what your app actually does.
🎯 Lesson 2: Developers Want Control, Not Full Automation
I initially built this as "one-click, no editing." Users hated it.
Turns out, developers want AI to do 80% of the work but keep control over the final 20%. That's why the visual canvas editor exists—complete with zoom/pan, keyboard shortcuts, and undo/redo.
🌍 Lesson 3: Multi-Language Is Harder Than It Seems
Supporting 6+ languages meant solving:
- ✅ UI translation
- ✅ AI prompts in each language
- ✅ Font support for special characters
- ✅ Character limit validation per locale
Was it worth it? Absolutely. International markets are huge for mobile apps.
What's Coming Next 🔮
Currently shipping:
- 🌐 In-project language switching
- 🤖 Android screenshot templates
- 🎨 Premium theme collections
- 👥 Team collaboration features
- ...and more based on your feedback!
Ready to Try It? 🎯
I built Lemmi Studio for developers like me who can ship code but struggle with marketing.
If you've ever procrastinated on launching because you dreaded making screenshots, this is for you.
Start Free Today 🚀
- ✅ Free tier with 3 projects
- ✅ No credit card required
- ✅ Ready in 2 minutes
Let's Build Together 🤝
This is sort of MVP v1. I'm shipping fast and iterating based on real feedback.
What would make this more useful for your launches?
Reach out:
- 🐦 X: @mateusz_b9
The Bottom Line 🎬
Built by developers, for developers.
Ship faster. Skip the designer. Launch today.
Cheers!
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