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username.md VS Diffee

Compare username.md VS Diffee and see what are their differences

username.md

Persistent, verifiable digital identity for humans and AI agents.

Rating
0 reviews
Pricing
Paid $9 / One-off (Founding Access)
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Diffee

Instant visual diffing between websites

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0 reviews
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DocRaptor
As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more 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.

username.md
Diffee
Website username.md diffee.me
Pricing
Paid $9 / One-off (Founding Access) Official pricing
—
Platforms
Web REST API
—
Company Startup from the United States · 2026 —
Listed in
Digital Identity Identity Verification Digital Signatures Identity Verification And Protection APIs Identity Provider SSOaS +4
Office & Productivity WordPress Personalization Online Services +1

About username.md and Diffee

In their own words, as submitted to SaaSHub.

username.md
Diffee

username.md gives people and AI agents an internet identity they actually own. Instead of identity living only inside a platform, account, or application, username.md provides a persistent, web-addressable identity that can be independently resolved and verified across the web. For people,...

Read more about username.md

No description of Diffee yet.

Features and specs

What each product offers, as listed by its team.

username.md 6 features
Diffee 0 features
  • Persistent Digital Identity
    A web-addressable identity for people and AI agents that they control and can use across the open web.
  • Machine-Verifiable Identity
    Supports did:web, signed claims and responses, W3C Verifiable Credentials, and RFC 9421 HTTP Message Signatures.
  • Developer & Agent APIs
    OpenAPI 3.1 and MCP-based identity resolution and verification for applications and AI agents.
  • Cryptographic Verification
    Ed25519 signatures enable software to verify identity data and signed responses.
  • Portable Identity
    Identity is designed to work across platforms instead of being locked to a single service.
  • Account & Domain Binding
    Connect identity to existing proofs such as domains, GitHub, Bluesky, and Keybase.

No features have been listed yet.

Videos

Walkthroughs and reviews on video.

username.md 0 videos + Add
Diffee 3 videos + Add

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Mr. Diffee Reviews The Tattooed Sales Guy

More videos

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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
username.md
Diffee
100% 100%
Digital Signatures
0% 0%
0% 0%
WordPress
100% 100%
100% 100%
Identity Provider
0% 0%
0% 0%
Personalization
100% 100%

Questions & Answers

As answered by people managing username.md and Diffee.

What makes your product unique?

username.md's answer

username.md gives people and AI agents an internet identity they actually own. Each identity is persistent, web-addressable and machine-verifiable, with support for open standards including did:web, signed claims and responses, W3C Verifiable Credentials, RFC 9421 and machine-readable identity resolution. The same identity can be understood by people, applications and AI agents across the open web.

Why should a person choose your product over its competitors?

username.md's answer

Unlike platform-specific profiles or identifiers, username.md is designed to be portable and independently verifiable. Your identity has its own web address, can connect to existing accounts and proofs, and can be resolved by both humans and software. It is built around ownership, open standards and interoperability rather than locking identity inside a single platform.

How would you describe the primary audience of your product?

username.md's answer

username.md is built for people, developers, businesses and AI-agent builders who need persistent, portable and verifiable digital identity. It is especially relevant for developers building AI agents and applications that need to resolve and verify identity programmatically across platforms and environments.

Which are the primary technologies used for building your product?

username.md's answer

username.md uses open identity and web standards including did:web decentralized identifiers, Ed25519 cryptographic signatures, RFC 9421 HTTP Message Signatures, W3C Verifiable Credentials, JSON-LD, JWS, OpenAPI 3.1 and MCP-based identity resolution and verification.

What's the story behind your product?

username.md's answer

Chris has imagined the idea of a universal identity for quite some time. He wrote a blog post about the topic in 2022 and the idea persisted.

As Ai permeated the internet, the idea of an individually routable internet identity became more prescient than ever.

Everyone has an email address, some people have a domain, but there was no one identity standard that empowered the end user, provides control levers for how their identity is managed and interpreted on the internet, and cryptographically provable by anyone.

username.md was created around this simple idea: your website is where you publish, but your username.md is who you are. As the internet becomes increasingly shaped by AI agents and machine-to-machine interactions, identity needs to be readable and verifiable by software as well as people. username.md is building an open identity layer where people and AI agents can have persistent identities they control.

Who are some of the biggest customers of your product?

username.md's answer

username.md serves individuals, developers, businesses and AI-agent builders. We do not publicly disclose individual customer names.

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