Comparison

VAT CheckMachine vs Calculator L + Twin Plus App #

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

Head to head
About

VAT CheckMachine

This free utility app validates EU VAT numbers instantly and calculates VAT amounts for all EU states. It offers on-the-fly correctness testing and keeps a history of checked numbers for easy reference and sharing.

Highlights
  • Instant EU VAT number validation
  • On-the-fly correctness testing
  • VAT and Net/Gross amount calculation
  • Supports all 28 EU states
  • History of checked numbers
  • Sharing of checked numbers
Read full description

The Ultimate VAT check machine! Comprehensive • Powerful • Flexible • Beautiful • Free! • Replaces 2 or more apps, keeps your iPhone tidy • On-the-fly correctness test of VAT numbers of all 28 EU states • Checks European VAT numbers (28 states) with EU authorities (VIES) • Calculates VAT and Net/Gross amounts for all rates of all 28 EU states • Keeps checked numbers history for reference and sharing What is it? CheckMachine is a free (ad-supported) iPhone app that encompasses a wealth of VAT-related functions within a single app: Instantly* validates all EU VAT numbers, so that you can safely issue zero-VAT invoices to entities entitled to VAT exoneration according to EU laws. Instantly calculates VAT and Net/Gross amounts for any amount you type, as you type it, and it does this for all VAT rates of all 28 EU states! Checked numbers can be added to History either automatically or manually, for reference and sharing with other apps or people. Auto-add is enabled through the app's Settings page. * Depending on availability of the VIES web service. Whom is it for? This app is a valuable free resource for business and pleasure. It serves those in the European Union involved with invoicing intra-EU transactions, and those in need of a handy and speedy VAT calculator that works in all EU states. How does it work? As the user types a VAT number of any EU state, the app examines its correctness ("well-formedness") on-the-fly using the actual algorithms of each EU state, not just the number and type of digits! This step ensures usability and keeps traffic and fees low. EU VAT numbers (from any of the 28 EU states) are checked using the official web service maintained by the European Commission's VAT Information Exchange System (VIES). Attention: Not all correct VAT numbers are valid, therefore you must always check the validity of all VAT numbers before actually using them in invoices.

About

Calculator L + Twin Plus App #

This utility app offers a dual calculator with persistent data and a comprehensive calculation history. Customize the appearance with various color themes and choose from multiple global comma formats for precise number display.

Highlights
  • Twin calculator functionality
  • Calculation history log
  • Multiple color themes
  • Global comma formatting options
  • Data persistence
Features
Read full description

******* You can move or check the calculation data of other calculators. ******* Data persistence. 1. TwinCalculator - 6 Calculator 2. Calculation History 3. Color (Basic) (Seashore) (Art Deco) (Cute) (Redon) (Gitanes) 4. Global Comma (0,000,000.0) (0,000,000·0) (0.000.000,0) (0’000’000.0) (0 000 000,0) (0,00,00,000.0) (0,0000,0000.0)

Screenshots

VAT CheckMachine4 screens
Calculator L + Twin Plus App #4 screens

Verdict

The call

The clearest difference is in-app purchases: VAT CheckMachine at none against Calculator L + Twin Plus App #'s 1. VAT CheckMachine also leads on ads (none vs shown) and iOS requirement (9.0 vs 12.0). Calculator L + Twin Plus App #'s advantage is review sentiment (25% vs 0%). On price, update cadence 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. Calculator L + Twin Plus App # sells 1 one-off in-app purchase. VAT CheckMachine asks for nothing beyond the download.

UpkeepUpdate frequency

VAT CheckMachine ships an update every 2 months, Calculator L + Twin Plus App # every 6 weeks. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
VAT CheckMachine versus Calculator L + Twin Plus App #: the parameters behind the verdict, then further details
ParameterVAT CheckMachineCalculator L + Twin Plus App #
PriceFreeFree
Rating—4.7 (23 ratings) — better
Positive reviews0.0% of reviews25.0% of reviews — better
Number of ratings—23 — better
Update frequencyEvery 2 monthsEvery 6 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.0 — better12.0
Further details — not scored
Size11 MB20 MB
Age rating4+4+
DeveloperEscape Tech LtdSatomi Uchida

Customer experience

VAT CheckMachine

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Calculator L + Twin Plus App #

All ratings21 ratings
Positive90.5%
Neutral9.5%
Negative0.0%
Written reviews8 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

VAT CheckMachine

No in-app purchases

1 purchases

Calculator L + Twin Plus App #

One-time1
  • Premium Version$2.99

Questions

Is VAT CheckMachine free?
VAT CheckMachine is free to download, with no in-app purchases.
Is Calculator L + Twin Plus App # free?
Calculator L + Twin Plus App # is free to download, with in-app purchases available.
Do VAT CheckMachine or Calculator L + Twin Plus App # have ads?
Calculator L + Twin Plus App # shows ads; VAT CheckMachine does not.
Which is updated more often, VAT CheckMachine or Calculator L + Twin Plus App #?
VAT CheckMachine ships an update every 2 months, and Calculator L + Twin Plus App # every 6 weeks. Most recently, VAT CheckMachine was updated on November 6, 2026 and Calculator L + Twin Plus App # on November 2, 2026.

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