Comparison

WeoInvoice vs FlatPrice

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

Head to head
About

WeoInvoice

Features
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weoInvoice's main focus, as an invoicing system, is to ensure that any user can meet their obligations without needing demos or having to rely on third-party intervention. With that in mind, we built a product that works on any device with internet access, simplified and intuitive for easy use, and customizable to the real needs of the user's business.

About

FlatPrice

Features
Read full description

FlatPrice is a professional cargo calculator for physical oil and petroleum trading. Calculate flat prices from benchmark + differential in any price unit. Convert quantities between MT, barrels, m³, gallons, and long tons with ASTM volume correction factors. Estimate voyage transit times between major oil ports. Convert cargo values to any currency with live FX rates. Features: Cargo Calculator • Flat price from benchmark + differential in $/bbl, $/MT, $/m³, ¢/gal, $/L • Cargo valuation with differential impact breakdown • Quantity conversion: MT, LT, bbl, gal, liters, GSV/GOV (m³) • ASTM Table 54A/B/C/D volume corrections (VCF) • Temperature corrections, buoyancy factors, air vs vacuum weight • API gravity, density at 15°C/20°C, thermal expansion Market Compare • Side-by-side port comparison with landed cost analysis • Price differentials, spread tracking, and ratio analysis • WTI benchmark tracking with crack spread • Price prediction with linear regression model • Interactive price history chart with 30/90/1Y views • Per-port daily price history saved automatically Quick Converter • Standalone unit converter with instant results • Supports MT, LT, bbl, gal, liters, GSV/GOV Voyage Estimate • Transit times for major oil ports worldwide • Suez, Panama, and Cape routes with alternatives • Configurable vessel speed presets FX Rates • Live exchange rates with currency converter iPad Dashboard • Every tool on one screen in a modular grid • Rearrange, resize, and collapse modules to fit your workflow • Layout saved automatically, with a guided tour to get started — FlatPrice is free during launch. A paid subscription will be introduced in a future update — you'll be notified in advance before any charges apply. Terms of Use: https://www.flatprice.app/terms.html Privacy Policy: https://www.flatprice.app/privacy.html

Screenshots

WeoInvoice4 screens
FlatPrice2 screens

Verdict

The call

The clearest difference is in-app purchases: WeoInvoice at none against FlatPrice's 1. FlatPrice's advantage is iOS requirement (15.1 vs 18.0). On price, update cadence, ads and device support 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

Both are free to download. FlatPrice sells 1 in-app purchase, starting at $17.99 per month. WeoInvoice asks for nothing beyond the download.

UpkeepUpdate frequency

WeoInvoice ships an update every 3 weeks, FlatPrice monthly. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

Scorecard2 real differences · 4 level
WeoInvoice versus FlatPrice: the parameters behind the verdict, then further details
ParameterWeoInvoiceFlatPrice
PriceFreeFree
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.1 — better
Further details — not scored
Size40 MB43 MB
Age rating17+4+
DeveloperWEO LDABruno Maestrini

In-app purchases

None

WeoInvoice

No in-app purchases

1 purchases

FlatPrice

Subscriptions1
  • FlatPrice6 Months trial$17.991 Month

Questions

Is WeoInvoice free?
WeoInvoice is free to download, with no in-app purchases.
Is FlatPrice free?
FlatPrice is free to download, with in-app purchases available.
Do WeoInvoice or FlatPrice have ads?
Neither WeoInvoice nor FlatPrice shows ads.
Which is updated more often, WeoInvoice or FlatPrice?
WeoInvoice ships an update every 3 weeks, and FlatPrice monthly. Most recently, WeoInvoice was updated on October 30, 2026 and FlatPrice on November 9, 2026.

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