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The VAT API VS Opalstack

Compare The VAT API VS Opalstack and see what are their differences

The VAT API

Instant EU VAT number validation for seamless compliance and automation.

The VAT API screenshot
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0 reviews
Pricing
Freemium Free trial $7.99 / Monthly
Alternatives Is it good?
Opalstack

Managed Hosting for developers, entrepreneurs, and businesses like yours

Opalstack Landing page
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0 reviews
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Spacebase
Streamline digital lease management with Spacebase. We offer a simple, modern platform for efficient payment processing, tracking, and compliance. Empower your team to handle leases seamlessly, reduce administrative workload, and boost productivity. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Base details

Website, pricing, platforms and company facts side by side.

The VAT API
Opalstack
Website thevatapi.com opalstack.com
Pricing
Freemium Free trial $7.99 / Monthly Official pricing
Official pricing
Company Startup from the United Kingdom · 1 - 9 employees · 2025 —
Listed in
Accounting & Finance Taxes Tax Compliance APIs API Tools +2
Hosting Web Hosting Managed Hosting Cloud Hosting +1

About The VAT API and Opalstack

In their own words, as submitted to SaaSHub.

The VAT API
Opalstack

The VAT API is a fast and reliable solution for validating EU VAT numbers via a simple, developer-friendly API. Designed for businesses, SaaS platforms, and eCommerce sites operating across Europe, it automates VAT ID verification in real time—helping you stay compliant, reduce fraud, and...

Read more about The VAT API

No description of Opalstack yet.

Features and specs

What each product offers, as listed by its team.

The VAT API 3 features
Opalstack 5 features
  • Real-time EU VAT
    Real-time EU VAT number validation via API
  • EU member states
    Supports all EU member states via VIES
  • JSON responses
    JSON responses with clear status, name, and country info
  • Developer-Friendly Hosting
    Opalstack is designed with developers in mind, offering SSH access, Git integration, and support for multiple programming languages and frameworks including Python, Node.js, Ruby, and PHP, giving developers granular control over their hosting environment.
  • Affordable Pricing
    Opalstack offers competitive pricing for shared and managed hosting plans, making it an accessible option for small businesses, freelancers, and individual developers who need robust features without enterprise-level costs.
  • Modern Control Panel
    Opalstack provides a clean, modern, and intuitive web-based dashboard for managing sites, applications, databases, and email accounts, which is a significant improvement over older-style hosting control panels like cPanel.
  • Strong Support for Multiple Applications
    The platform supports a wide variety of application types including WordPress, Django, Flask, Express, static sites, and more, allowing users to host diverse projects on a single account with easy deployment.
  • Reliable Infrastructure and Support
    Opalstack is built by former WebFaction team members, bringing experienced hosting expertise. They offer responsive customer support and a reputation for stable, well-managed server infrastructure with good uptime.

Possible disadvantages

  • Smaller Community and Ecosystem
    Compared to major hosting providers like DigitalOcean, AWS, or even shared hosts like SiteGround, Opalstack has a smaller user base, which means fewer community tutorials, third-party guides, and forum discussions available for troubleshooting.
  • Limited Scalability Options
    Opalstack is primarily a shared hosting provider, which means it may not be the best choice for high-traffic applications or projects that require rapid, on-demand scaling of resources like CPU, RAM, or storage.
  • Not Ideal for Beginners
    While developer-friendly, Opalstack's approach can be intimidating for non-technical users. Setting up applications often requires familiarity with the command line and server configuration, which may not suit those looking for simple one-click solutions.
  • Limited Data Center Locations
    Opalstack offers a relatively small number of data center locations compared to major cloud providers, which may result in higher latency for users targeting audiences in regions not well-served by the available server locations.
  • Fewer Managed Services and Add-ons
    Unlike larger hosting platforms, Opalstack lacks a wide range of managed add-on services such as built-in CDN integration, managed backups with granular restore options, or one-click SSL management that more mainstream providers offer out of the box.

Analysis

An editorial look at what each product does well and who it suits.

The VAT API
Opalstack

Overall verdict

  • The VAT API (thevatapi.com) is a solid, developer-friendly service for validating VAT numbers and handling EU VAT rate lookups, offering reliable data and straightforward integration that makes it a good choice for businesses needing tax compliance automation.

Why this product is good

  • Provides accurate, up-to-date EU VAT rates and reliable VAT number validation via VIES
  • Simple RESTful API with clear documentation that is easy to integrate into existing systems
  • Helps automate tax compliance, reducing manual errors in cross-border transactions
  • Offers price calculation features including VAT-inclusive and VAT-exclusive amounts
  • Typically supports fast response times and reasonable pricing tiers for various business sizes

Recommended for

  • E-commerce businesses selling across EU member states
  • SaaS companies needing automated VAT compliance and invoicing
  • Developers building billing or checkout systems requiring VAT validation
  • Accounting and fintech platforms handling tax calculations
  • Small to medium enterprises seeking to streamline cross-border tax reporting

Overall verdict

  • Opalstack is a solid choice for developers and tech-savvy users seeking an affordable, flexible control panel hosting solution with good performance and transparent pricing, though it may require more technical know-how than mainstream cPanel hosts.

Why this product is good

  • Uses a custom lightweight control panel that's fast and efficient compared to resource-heavy alternatives like cPanel
  • Offers straightforward, transparent pricing without hidden fees or aggressive upselling
  • Provides SSD storage and solid server performance for the price point
  • Supports multiple app types including Python, Node.js, and various frameworks beyond typical PHP hosting
  • Founded by the original creators of WebFaction, bringing significant hosting industry experience
  • Good for running multiple websites/apps under one account with granular resource control
  • Responsive customer support with a knowledgeable team
  • No long-term contracts required, allowing flexibility

Recommended for

  • Developers who need support for Python, Node.js, or other non-PHP applications
  • Users comfortable with a more technical, non-cPanel control panel interface
  • Small businesses or freelancers hosting multiple websites who want granular control
  • Former WebFaction users looking for a similar service after its shutdown
  • Budget-conscious users who want VPS-like flexibility without full server management
  • Users who prioritize transparent pricing over bundled marketing extras

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
The VAT API
Opalstack
100% 100%
Tax Compliance
0% 0%
0% 0%
Hosting
100% 100%
100% 100%
APIs
0% 0%
0% 0%
Managed Hosting
100% 100%

Questions & Answers

As answered by people managing The VAT API and Opalstack.

Which are the primary technologies used for building your product?

The VAT API's answer

Built on AWS (Amazon EC2/API Gateway), with Postman collection for docs, JSON/REST API architecture pulling VAT data from VIES and HMRC endpoints

Who are some of the biggest customers of your product?

The VAT API's answer

businesses all over the world

How would you describe the primary audience of your product?

The VAT API's answer

Digital businesses, SaaS and e-commerce platforms needing accurate, real-time VAT rate lookup, VAT number validation, and compliant invoice generation across EU & UK.

What's the story behind your product?

The VAT API's answer

Launched in late 2014 for new EU VAT rules (TBE services). Version 2 released in April 2019 with rewritten core, better docs, infrastructure, pricing, and future-proofing (Brexit, EU changes)

What makes your product unique?

The VAT API's answer

A UK-based, Amazon‑hosted service with real-time VAT rates, cross-border validation (EU/UK), compliant invoicing features, IP-based geolocation, currency conversion, audit-ready logs, and developer-friendly docs.

Why should a person choose your product over its competitors?

The VAT API's answer

Offers mature, stable service since 2015, scalable AWS infrastructure, direct integration with official EU Commission and HMRC tools, and built-in VAT-compliant invoicing.

User comments

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