Comparison

DupeDetective Receipt Scanner vs Sinkstack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DupeDetective Receipt Scanner

This app acts as your personal receipt auditor, quickly identifying and flagging duplicate charges on your grocery receipts. It uses on-device AI to scan paper or digital receipts, helping you get refunds for costly billing errors. It also includes a smart grocery list manager and receipt history for organized shopping and spending tracking.

Highlights
  • Instant duplicate detection
  • On-device AI scanning
  • Smart grocery list manager
  • Receipt history and organization
  • Fast and easy to use
  • Light and dark mode support
Features
Read full description

Dupe Detective: Stop Paying for Double Scans Did the cashier accidentally scan an item twice? Did that “Buy One, Get One” deal actually ring up correctly? Grocery stores are busy, and checkout mistakes happen more often than you think. Dupe Detective is your personal receipt auditor and budget protector. Designed to catch costly double-scans and billing errors, our smart receipt scanner makes it incredibly fast and easy to verify your purchases before you even leave the parking lot. Simply snap a photo of your paper receipt or import a digital one. Our advanced, on-device AI instantly reads the line items and flags any duplicate charges so you can head straight to customer service and get your refund. Works with Costco, Kroger, Fry’s, Sam’s Club, Walmart and most major grocery stores. No subscription required. Everything is processed privately on your iPhone. Key Features Instant Duplicate Detection Quickly identifies identical or highly similar items on your receipt. Stop guessing and start verifying. 100% Private, On-Device Scanning Your financial data belongs to you. Dupe Detective uses advanced on-device OCR to read your receipts with no cloud servers, no data harvesting, and no internet connection required. Smart Grocery List More than just a scanner, Dupe Detective includes a built-in grocery list manager. Plan your shopping trips ahead of time, stay on budget, and keep everything organized in one place. Receipt History & Organization Keep a digital archive of your past shopping trips. Easily save and review scanned receipts to track spending habits, monitor price changes over time, or keep records for returns and warranties. Fast & Easy to Use Professional interface designed for quick scans. Get results in seconds so you can get on with your day. Download Dupe Detective today and start catching the charges you shouldn’t be paying for. Seamless Light & Dark Mode A beautifully designed interface that automatically adapts to your system preferences, or can be toggled manually in the app settings for comfortable viewing at any time of day. DUPEDETECTIVE PRO Upgrade to our Pro tier to unlock unlimited receipt scanning and continuous protection against checkout errors for less than the cost of a single double-scanned item! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Sinkstack

Features
Read full description

Sinkstack turns irregular bills into a plan for every paycheck. Create a sinking fund for each bill you only see a few times a year, such as car insurance, holidays, renewals and repairs, and Sinkstack shows what to set aside from each upcoming paycheck so each one is covered by its due date. NEW IN 4.0: PAYCHECK PLAN Choose how often you are paid and one payday. Each of your next 4, 6 or 12 paychecks then lists what to set aside for every fund: • Funds with a due date spread what they still need evenly across the paydays before that date, exact to the cent. • Recurring bills start their next cycle automatically after each due date. • Funds without a due date use the contribution you planned. • Bills that land before your next payday are flagged with the amount still needed. • Enter your take-home pay (optional) to see what is left after the set-asides. • Book the next paycheck's set-asides as deposits in one step, or export the plan as CSV. ALSO NEW • Backup & Restore: one file with every fund, ledger entry, pay schedule and Payday Bridge plan. Restore checks the whole file first and saves a copy of your current data before replacing anything. • Widgets: a Next Payday countdown (you set the schedule in the widget; it never shows balances) and Quick Actions for the allocator, Paycheck Plan and Payday Bridge. • Control Center control and Siri / Shortcuts actions to open the allocator, Paycheck Plan or Payday Bridge. • A redesigned tab layout: Funds, Paychecks, Calendar, Insights and Settings. EVERYTHING ELSE YOU ALREADY HAVE • Unlimited sinking funds with goals, due dates, weekly to annual contributions, revolving funds and recurring bills that reset after each due date. • Paycheck allocator: split new money across your funds proportionally, by priority or evenly, booked as dated deposits. • Payday Bridge: put income and payments on real dates to find the lowest balance before payday and test a late payday. • Funding Calendar: 12 months of set-asides and bill dates, with busy months marked. • Insights, catch-up options for funds that fell behind, a what-if solver, PDF statements and CSV export. • 60+ templates for common irregular expenses. PRIVATE BY DESIGN No account, no bank login, no ads, no tracking. Your data stays on your device. Amounts use exact decimal math. One purchase. No subscription. Sinkstack is a planning tool. It does the arithmetic on the numbers you enter; it does not move money, connect to a bank or give financial advice. iPhone and iPad.

Screenshots

DupeDetective Receipt Scanner4 screens
Sinkstack4 screens

Verdict

The call

The clearest difference is price: DupeDetective Receipt Scanner at Free against Sinkstack's $0.99. Sinkstack's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

DupeDetective Receipt Scanner is free to download; Sinkstack costs $0.99 up front. DupeDetective Receipt Scanner sells 1 in-app purchase, starting at $4.99 per year. Sinkstack asks for nothing beyond the download.

UpkeepUpdate frequency

DupeDetective Receipt Scanner ships an update every 8 days, Sinkstack every 6 days. The most recent releases landed on October 18, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
DupeDetective Receipt Scanner versus Sinkstack: the parameters behind the verdict, then further details
ParameterDupeDetective Receipt ScannerSinkstack
PriceFree — better$0.99
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 8 daysEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS18.617.0 — better
Further details — not scored
Size2 MB6 MB
Age rating4+4+
DeveloperMarcus ChaffeeRobert Corbin

In-app purchases

1 purchases

DupeDetective Receipt Scanner

Subscriptions1
  • DupeDetectivePro7 Days trial$4.991 Year
None

Sinkstack

No in-app purchases

Questions

Is DupeDetective Receipt Scanner free?
DupeDetective Receipt Scanner is free to download, with in-app purchases available.
Is Sinkstack free?
Sinkstack costs $0.99, with no in-app purchases.
Do DupeDetective Receipt Scanner or Sinkstack have ads?
Neither DupeDetective Receipt Scanner nor Sinkstack shows ads.
Which is updated more often, DupeDetective Receipt Scanner or Sinkstack?
DupeDetective Receipt Scanner ships an update every 8 days, and Sinkstack every 6 days. Most recently, DupeDetective Receipt Scanner was updated on October 18, 2026 and Sinkstack on October 25, 2026.

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