WeoInvoice vs FlatPrice
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WeoInvoice
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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.
FlatPrice
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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
Verdict
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
Both are free to download. FlatPrice sells 1 in-app purchase, starting at $17.99 per month. WeoInvoice asks for nothing beyond the download.
WeoInvoice ships an update every 3 weeks, FlatPrice monthly. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.
| Parameter | WeoInvoice | FlatPrice |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 40 MB | 43 MB |
| Age rating | 17+ | 4+ |
| Developer | WEO LDA | Bruno Maestrini |
In-app purchases
WeoInvoice
No in-app purchases
FlatPrice
- FlatPrice6 Months trial$17.991 Month









