StampCal - Smart Postage Calculator
Find the perfect stamp combo with minimal overpayment
3 followers
Find the perfect stamp combo with minimal overpayment
3 followers
StampCal solves the stamp combination puzzle instantly. Select your available denominations, enter the target amount, and get the optimal solution with minimal overpayment. Perfect for convenience store staff and postal customers. Will Support 15+ countries.
👋 Hey Product Hunt!
🎉 LAUNCH SPECIAL: Free DL until October 17th!
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I built StampCal to solve a daily pain point for postal workers and convenience store staff worldwide.
The Problem:
Working at a 7-Eleven, CVS, Walgreens, or post office selling stamps? Customers need €2.90 postage but you
only have €1.00, €0.70, €0.20 stamps. What's the fastest combination with minimal overpayment?
The Solution:
StampCal instantly calculates optimal stamp combinations:
• €1.00×2 + €0.70 + €0.20 = €2.90 (exact!)
• Alternative: €1.00×3 = €3.00 (€0.10 over, fewer stamps)
✨ NEW: Custom Stamps with Your Own Images!
🎨 Upload photos of your actual stamp inventory
✏️ Edit denominations, images, and organize by groups
📸 Perfect for rare stamps, special editions, or regional variants
🏪 Create custom inventory matching your store's stock
Perfect For:
✅ Post office clerks handling postal service
✅ 7-Eleven, CVS, Walgreens stamp counters
✅ Walmart, Target, Kroger service desks
✅ Stamp collectors managing collections
✅ International travelers & expats
✅ Anyone mailing packages regularly
Key Features:
📱 100% offline - no internet needed
🌍 Will Support 15 countries (USA, Germany, Japan, France, etc.)
⚡ Instant calculations with dynamic programming
📊 Multiple optimization strategies (min overpay vs min stamps)
🎨 Custom stamps - add your own denominations with photos
✏️ Long-press to edit stamps and images
🏪 Stock management - only suggests stamps you have
🔒 Privacy-first - zero data collection
🖼️ Beautiful, intuitive interface
Why Professionals Love It:
"Custom stamp feature is perfect for our regional stamps" - Postal worker
"Upload images of our actual inventory - game changer!" - Store manager
"Speeds up stamp sales during rush hours" - Convenience store clerk
"No more manual calculation errors at the counter" - Service desk staff
Try it out and upload your first custom stamp! Let me know which country you'd like to see added! 🚀
#RetailTech #PostalService #CustomizableTools #ProductivityApps
Ver.1.2 (currently under review, coming soon)
allows users to set up their own stamp inventory and customize stamp designs, making it possible to support stamps from any country and with any denomination.