I Spent 3 Days Making App Store Screenshots (So I Built a Tool That Does It in 15 Minutes)

Mateusz — Fri, 24 Oct 2025 20:11:40 +0000

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.

Try it free →

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

Try Lemmi Studio →

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.

Try Lemmi Studio Free →

Cheers!

Forem: Mateusz