This page is designed to help you find out whether Tessio is good and if it is the right choice for you.
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 carries age booleans and nothing else: the specification forbids it from holding any other attribute. 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: age checks from the EU age verification app work in production today, with each attestation checked against the age verification trusted list the Commission publishes. Denmark is the first country on that list, so live coverage starts there, and test mode works from any member state. The EU Digital Identity Wallet is a separate path and it is still gated, because that wallet checks who is asking before it releases anything, so it needs a relying party access certificate, which we applied for on 5 August 2026 and do not yet hold. Signup is open and a test project works as soon as you create one. Sending real traffic needs us to switch your organisation to live mode, so that part stays a conversation.
Listed in
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.
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.
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.
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.
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.
.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.
We have collected here some useful links to help you find out if Tessio is good.
Check the traffic stats of Tessio on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of Tessio on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of Tessio's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of Tessio on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about Tessio on Reddit. This can help you find out how popualr the product is and what people think about it.
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Is Tessio good? This is an informative page that will help you find out. Moreover, you can review and discuss Tessio here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
