Stop Guessing.
Know Your Numbers.
Calculate melt value, estimate refinery payouts, and grade every deal — before you buy.
Always free to use. Every new account unlocks all Pro features for 2 weeks — no credit card required.
Calculator · Inventory · Receipts · AI Coin ID · Portfolio · Analytics — all in one app.
You enter
Nu Stack tells you
Based on live spot • 98% refinery rate • 20% profit target
Example calculation only. Results vary based on actual spot price at time of purchase.
Meet Stack — Your Personal Guide
Not sure where to start? Stack walks you through the entire app — from your first deal to advanced strategy tools. No manuals. No tutorials. Just ask.
"Hey! Welcome to Nu Stack. I'm Stack — I'll walk you through everything. Want to start by entering a practice deal, or explore your dashboard first?"
Available on every page — just click the chat icon in the bottom corner.
Instant Coin Identification
Snap a photo. The AI identifies the coin, tells you its metal content, and gives you an instant valuation — from melt value to collector premium.
Everything a Precious Metals Buyer Needs
Built for scrap gold buyers, coin collectors, and stackers — real tools, not toy calculators.
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Scrap Calculator
Enter weight, pick karat, get melt value and refinery payout instantly.
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AI Coin ID
Snap a photo. Get the coin, the year, and the value.
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Portfolio Tracking
See your total holdings, allocation, and gain/loss in real time.
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Digital Receipts
Generate branded receipts with signature capture and photo proof.
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Voice Input
Speak your weights — hands-free entry for the counter.
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Browser Companion
See live valuations while you browse online listings.
How It Works
Log a Purchase
Bought scrap gold at a pawn shop, estate sale, flea market, or online? Enter it here.
Enter Weight & Karat
Type in the weight and purity. Add multiple karats if it's a mixed lot.
See Your Breakdown
Instantly see: melt value, estimated refinery payout, and a profitability grade.
Three Tools in One.
Nu Stack Replaces Them All.
Instead of switching between a melt calculator, coin ID app, and spreadsheet — use one integrated platform with real refinery math.
| Feature | 🧮 Free Melt Calculators | 📸 Coin ID Apps | 📋 Inventory Spreadsheets |  Nu Stack |
|---|---|---|---|---|
| Live spot prices | ✅ | ❌ | ❌ | ✅ |
| Basic melt value | ✅ | ❌ | ❌ | ✅ |
| Melt value with refinery rate | ❌ | ❌ | ❌ | ✅ |
| Profitability grading | ❌ | ❌ | ❌ | ✅ |
| Decision breakdown & benchmarking | ❌ | ❌ | ❌ | ✅ |
| Refinery rate + treatment charges | ❌ | ❌ | ❌ | ✅ |
| Multi-karat mixed lots | ❌ | ❌ | ❌ | ✅ |
| Yield deductions (stones, clasps) | ❌ | ❌ | ❌ | ✅ |
| XRF purity overrides | ❌ | ❌ | ❌ | ✅ |
| AI coin identification | ❌ | ✅ | ❌ | ✅ |
| 1,600+ coin database with valuations | ❌ | partial | ❌ | ✅ |
| Melt + dealer + collector pricing | ❌ | partial | ❌ | ✅ |
| Inventory tracking with photos | ❌ | ❌ | partial | ✅ |
| Seller receipts with signature pad | ❌ | ❌ | ❌ | ✅ |
| PDF receipt generation | ❌ | ❌ | ❌ | ✅ |
| Customer-facing mode | ❌ | ❌ | ❌ | ✅ |
| Seller ledger & CRM | ❌ | ❌ | ❌ | ✅ |
| Profit dashboard & analytics | ❌ | ❌ | partial | ✅ |
| Performance by source & item type | ❌ | ❌ | ❌ | ✅ |
| Sell / ship pipeline | ❌ | ❌ | ❌ | ✅ |
| Voice input (“Hey Stack”) | ❌ | ❌ | ❌ | ✅ |
| 8 currencies + live FX | ❌ | ❌ | ❌ | ✅ |
One app. One login. Every tool a precious metals buyer needs.
Ready to stop leaving money on the table?
Features You Won't Find Anywhere Else
These aren't checkboxes. These are real tools built for how dealers actually work.
XRF Purity Overrides
Got an XRF reading that shows 56.2% instead of standard 14k? Enter the exact purity per item. Your melt value and payout estimate update instantly — no rounding, no guessing.
Signature Receipt PDFs
Generate professional PDF receipts with grade breakdown, live spot, payout amount, and a seller signature pad — right on your phone. Replace handwritten receipts forever.
Profitability Grading + Self-Benchmarking
Every entry gets a profitability grade — with a breakdown of why. Plus, it ranks each purchase against your entire history so you improve with every transaction.
Voice Input — "Hey Stack"
Hands full at a pawn shop? Say "5 grams 14k" and it enters the data for you. Wake-word activated, continuous listening, with undo and clear commands.
Built on Real Refinery Math
Every calculation mirrors how refineries actually pay: spot price × refinery rate − treatment charges, adjusted for purity and yield deductions. No guesswork. No "estimated melt value." Your actual expected payout.
USD
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JPYReal Feedback from Nu Stack Users
Swipe through to see how buyers, stackers, and collectors are using the app.
Nu Stack makes it much easier to know what I'm looking at before I buy. Being able to check melt value quickly gives me a lot more confidence when comparing gold and silver deals.
As someone still learning, this app makes gold and silver less intimidating. I can check values, understand the deal better, and feel like I'm not guessing.
The deal scanner is one of the most useful parts of the app. It helps me sort through listings faster and spot the ones that are actually worth looking at.
I like having my stack organized in one place. Seeing what I own, what I paid, and where things stand today makes the app feel really practical.
Nu Stack is helpful whether I'm checking a coin, bullion, or scrap gold. It gives me a quick way to compare the metal value before making a decision.
The price alerts are great because I don't have to keep checking spot prices all day. I can set my target and let the app tell me when it matters.
The dealer map is a nice bonus. It makes it easier to find local shops and keep track of places I may want to visit again.
This saves me time. Instead of bouncing between calculators, spot price sites, and notes, I can do most of what I need in one app.
I can see myself paying for this because it helps me make better buying decisions. Avoiding one bad deal could easily cover the cost.
Nu Stack feels like a practical tool for anyone buying physical gold or silver. It gives me better information before I spend money, and that is exactly what I need.
Simple, Transparent Pricing
Start free — and try every Pro feature for 2 weeks. No card needed.
💡 Make informed decisions with profitability grading on every entry.
Everything you need to calculate and track your purchases.
For serious buyers who track coins and manage inventory.
Cancel anytime · Billed monthly · No contracts
Full power. Every tool in one place.
Cancel anytime · Billed monthly · No contracts
Ready to Track Your Precious Metals Portfolio?
Join precious metals buyers who calculate with confidence. 2 weeks of Pro free on signup — no credit card required.
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