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Tessio VS React Server

Compare Tessio VS React Server and see what are their differences

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Contents:
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Tessio logo Tessio

Hosted age and identity verification for the EU Digital Identity Wallet. Over-18 checks that keep no personal data, built on an open source .NET core.

React Server logo React Server

Blazing fast page load and seamless transitions
  • Tessio Dashboard
    Dashboard //
    2026-08-14
  • Tessio Developer Docs
    Developer Docs //
    2026-08-14

Tessio is an age and identity verification API built on the EU Digital Identity Wallet.

Most age assurance today means uploading an ID document or taking a selfie. That solves the regulator's problem by creating a data protection one, because you then hold identity data you have to secure, justify and disclose if it leaks.

Tessio asks a narrower question. One API call starts an over 18 check, the user approves it in their wallet, and a signed result lands on your webhook. The credential we request is the EU age verification attestation, which contains thirteen age booleans and nothing else. There is nothing to store, because there is nothing to receive.

Built for platforms that need to meet the UK Online Safety Act and the EU Digital Services Act without becoming a custodian of identity data. The verifier underneath is open source .NET, Apache-2.0, on NuGet, so you can self host it or read exactly what it does. It passes the OpenID Foundation conformance suite for OpenID4VP 1.0 HAIP verifiers, in both credential formats the EU wallet uses.

Member states must make the wallet available by December 2026 under Regulation (EU) 2024/1183, and regulated relying parties must accept it by December 2027.

Stage, plainly: the API is live and you can integrate against the sandbox today. Access is invite only. Production wallets require a relying party access certificate, which we have applied for and do not yet hold, as is true of every relying party in Europe right now.

  • React Server Landing page
    Landing page //
    2019-09-17

Tessio features and specs

  • Wallet-native age checks
    Proves 18+ (or any of thirteen age thresholds) from the EU Digital Identity Wallet. The user approves the request on their own device.
  • No personal data received
    The credential we request carries age booleans only: no name, no date of birth, no document number, no photo. There is nothing to store or breach.
  • One API call
    Start a check with a single REST call, get back a link or QR code, receive the signed result on your webhook.
  • Signed webhooks
    Results delivered with an HMAC-SHA256 signature and timestamp, so you can verify authenticity and detect replays.
  • Both EU credential formats
    SD-JWT VC and ISO mdoc, the two formats the EU wallet ecosystem uses. The verifier underneath passes the OpenID Foundation conformance suite in both.
  • Sandbox included
    Integrate and test end to end today; checks complete in about two seconds against the sandbox.
  • Open source core
    The verifier library is Apache-2.0 on NuGet, so you can read exactly what the crypto does before trusting it.
  • EU hosted
    Runs entirely on EU infrastructure (Finland). Data never leaves the EU.

React Server features and specs

  • Server-side rendering built-in
    React Server provides built-in server-side rendering (SSR) out of the box, which improves initial page load performance and SEO without requiring complex custom setup.
  • Fast page transitions
    React Server supports fast client-side page transitions after the initial server render, giving users a smooth single-page application experience while retaining SSR benefits.
  • Built on React
    Since it is built on top of React, developers already familiar with React can leverage their existing knowledge and the vast React ecosystem of components and libraries.
  • Code splitting and lazy loading
    React Server supports automatic code splitting and lazy loading of components, which helps reduce the initial bundle size and improves page load times for end users.
  • Simplified SSR configuration
    Compared to setting up SSR manually with React, React Server abstracts away much of the complexity involved in server rendering, routing, and hydration, making it easier to get started.

Possible disadvantages of React Server

  • Small community and ecosystem
    React Server has a relatively small community compared to mainstream frameworks like Next.js or Remix, which means fewer tutorials, third-party plugins, and community support resources are available.
  • Limited maintenance and updates
    The project has seen limited active development and maintenance over time, raising concerns about long-term viability, bug fixes, and compatibility with newer versions of React.
  • Sparse documentation
    The documentation for React Server is not as comprehensive or well-maintained as that of more popular alternatives, making it harder for new developers to learn and troubleshoot issues.
  • Fewer features compared to alternatives
    Compared to mature frameworks like Next.js, React Server lacks many modern features such as API routes, built-in image optimization, incremental static regeneration, and a rich plugin ecosystem.
  • Risk of project abandonment
    Given the low activity on the project's repository and the dominance of competing frameworks, there is a risk that the project may become abandoned, leaving adopters without future support or updates.

Analysis of React Server

Overall verdict

  • React Server (react-server.io) is a specialized framework for building server-rendered React applications with a focus on performance and simplified architecture, but I don't have verified, up-to-date information confirming its current status, adoption, or quality compared to alternatives like Next.js or Remix. I'd recommend researching current reviews and documentation directly before making a decision.

Why this product is good

  • Claims to offer server-side rendering capabilities for React applications
  • May provide an alternative approach to SSR compared to more established frameworks
  • Specific technical merits would depend on your project requirements and current documentation

Recommended for

  • Developers researching alternative SSR solutions for React
  • Teams willing to evaluate niche or less mainstream frameworks
  • Projects where established frameworks like Next.js don't fit specific architectural needs
  • Users who should verify current features, community support, and maintenance status before adopting

Category Popularity

0-100% (relative to Tessio and React Server)

Tessio

React Server

Security & Privacy
100 100%
Security & Privacy
0% 0
Javascript UI Libraries
0 0%
Javascript UI Libraries
100% 100
Identity Verification
100 100%
Identity Verification
0% 0
JS Library
0 0%
JS Library
100% 100

Questions & Answers

As answered by people managing Tessio and React Server.

What makes your product unique?

Tessio's answer

Tessio verifies age from the EU Digital Identity Wallet instead of collecting documents or selfies. The credential it requests carries age booleans and nothing else: no name, no date of birth, no document number, no photo. That means there is no identity data to store, leak or audit, and it is a property of the protocol rather than a promise, so you can verify it yourself. The verifier underneath is open source and passes the OpenID Foundation conformance suite for OpenID4VP 1.0 HAIP verifiers in both EU credential formats.

Why should a person choose your product over its competitors?

Tessio's answer

Most age verification vendors solve the regulator's problem by creating a data protection one: you end up holding ID documents or biometric data. Tessio asks a narrower question and receives a narrower answer, a signed yes or no. For platforms under the UK Online Safety Act, the EU Digital Services Act or gambling licences, that removes the breach surface and most of the GDPR overhead instead of managing it. And because the verification core is open source, a technical reviewer can check the claims before ever talking to us.

How would you describe the primary audience of your product?

Tessio's answer

Compliance and product teams at age regulated platforms in the EU and UK: iGaming operators, nicotine and alcohol e-commerce, dating and social apps, and the platform providers that serve them. The integration is a REST API with webhooks, built to be wired in by one developer in an afternoon.

What's the story behind your product?

Tessio's answer

Tessio is built by a small studio in Stockholm (Triple Down AB). The starting point was a regulatory collision: age checks are becoming mandatory across Europe while the usual methods, document upload and face scanning, create exactly the data protection risk the same regulators punish. The EU Digital Identity Wallet made a third way possible for the first time: a credential that proves an age threshold and contains nothing else. We built the verifier, open sourced it, ran it through the OpenID Foundation conformance suite, and put a hosted API on top. It is early and access is invite only, and the site says so plainly.

Which are the primary technologies used for building your product?

Tessio's answer

.NET and ASP.NET Core, PostgreSQL and Valkey, a Next.js dashboard, all running on EU infrastructure. The protocol layer is OpenID4VP 1.0 with SD-JWT VC and ISO 18013-5 mdoc credentials. The verifier library, Tessio.Verifier, is Apache-2.0 on NuGet.

User comments

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What are some alternatives?

When comparing Tessio and React Server, you can also consider the following products

Veriff - AI-powered identity verification & fraud prevention software Veriff provides a best- in-class identity verification solution combining AI with in-house experts to maximize accuracy and speed.

Yoti - A simple, secure way to store and prove your identity

iDenfy - Security & Privacy

Onfido - Onfido is the data-driven platform for intelligent background checking.

AgeCheck.pro - Intelligent age verification platform. Secure your site in minutes with Dual-Engine AI, frictionless UX, and 100% Zero-PII compliance.

COPID Verify - Verify 18+ in seconds. No accounts. No stored video. One-time, verifiable token.

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