Atsign
Atsign builds a peer-to-peer, end-to-end encrypted protocol using unique cryptographic identities (Atsigns) that eliminate open inbound ports and identity-provider dependencies, serving enterprises deploying secure agentic AI, IoT, and privacy-first communications.
- Company typePrivate
- Founded2019
- HeadquartersSan Jose, United States
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What Atsign does
Atsign (formerly The @ Company) is a privately held, San Jose-based open-source infrastructure company founded in 2019 that builds a peer-to-peer, end-to-end encrypted protocol for secure communication between people, devices, and AI agents. The core architecture replaces traditional network attack surfaces — open inbound ports, identity providers, and token-based sessions — with direct-trust verification: every actor is assigned a unique, quantum-safe, non-custodial cryptographic identity (an "Atsign"), and connections are only permitted after mutual identity verification through atServers using atRecord-formatted data. The company monetizes through paid Custom Atsign registrations (Hybrid, Custom, Single Word, and Three Character tiers with upfront and annual renewal fees) and enterprise licensing for its products: the Atsign Platform (sovereign messaging layer), NoPorts (zero-trust remote access for IoT and SSH), and the atSDK (Dart, with C and Java in development). Its primary go-to-market combines a self-serve developer funnel (AI Architect at aiarachitect.atsign.com with 10 free trial Atsigns) with enterprise field sales targeting CISOs and security engineering teams deploying agentic AI systems. Customer case studies span HealthTech (PHI processing with 95% compliance checklist satisfaction from day one), corporate governance (multi-agent voting with human-gated cryptographic verification), and enterprise communications (zero-knowledge messaging). Atsign has raised approximately $11.16 million in disclosed funding across three rounds and employs 1-10 people as of 2026.
Atsign firmographics
Firmographics- Name
- Atsign
- Legal name
- Atsign
- Website
- https://atsign.com
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Atsign builds a peer-to-peer, end-to-end encrypted protocol using unique cryptographic identities (Atsigns) that eliminate open inbound ports and identity-provider dependencies, serving enterprises deploying secure agentic AI, IoT, and privacy-first communications.
- Ownership category
- akta.pro rank
Atsign industry classification
Industry- Product category
- Zero-Trust Identity and Secure Networking Platform
- NAICS
- Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- Authentication (MFA/Passwordless/Biometrics) Platforms (BPAMAEAE)
- akta.pro secondary industry
- Decentralized Identity (DID) & Identity Wallets (DID methods, DIDComm, identity agents) (FSAPACAG)
Keywords
Where Atsign is headquartered
LocationHeadquarters
- HQ city
- San Jose
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Atsign business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Marketing or Sales, Operations, Infrastructure
Revenue model
- Custom Atsigns Registration and Licensing: Atsign offers Custom Atsigns (paid) at four levels: Hybrid, Custom, Single Word, and Three Character. Registration requires upfront fees and annual renewal fees. Legacy Free Atsigns are no longer offered for new registrations but existing holders may continue using them. Atsigns can be sold and traded.
- Platform and Product Licensing: The Atsign Platform, AI Architect, and NoPorts products appear to operate on licensing models for enterprise and developer use, though specific pricing is not publicly disclosed.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Others | Legacy Free Atsigns (existing holders only) |
| Subscription | Annual | Custom Atsigns (Paid) |
| Freemium | Pay-as-you-go | AI Architect Trial |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels9 records
Atsign product offering
Product offeringCore offering
Atsign builds an open-source peer-to-peer infrastructure platform centered on cryptographic identities (Atsigns) and zero-trust connectivity. Its core offerings are the Atsign Platform (a sovereign messaging layer that verifies identity before any connection and eliminates open inbound ports), AI Architect (a visual tool that produces LLM prompts to generate secure-by-design agentic applications), and NoPorts (zero-trust remote device access without VPNs). Customers register Atsigns via a paid registrar and integrate the platform through the atSDK to build privacy-first, compliance-ready applications.
Product overview
Atsign offers a privacy-first technology platform centered on cryptographic identity and zero-trust architecture. The product portfolio consists of two main pillars: AI Architect (a visual blueprinting tool for designing secure agentic systems) and Atsign Platform (the underlying sovereign messaging layer with direct-trust architecture). Supporting these are Atsigns (cryptographic identities), atSDK (developer toolkit for Dart/C/Java), and NoPorts (zero-trust connectivity module). AI Architect integrates with Claude via Model Context Protocol to generate secure-by-design applications from visual blueprints, while Atsign Platform eliminates traditional network attack surfaces through identity-first, no-open-ports architecture.
Differentiator
Problem solved
Functional benefit
Brands
- AI Architect: Visual blueprinting tool for designing secure apps and workflows; produces LLM prompts to generate Dart/Flutter projects on Atsign Platform.
- NoPorts
- Atsign Platform
Products and services
- AI Architect Visual blueprinting tool for designing secure-by-design agentic apps and workflows. Interprets nodes, data flows, and agent relationships to produce LLM prompts that generate Dart/Flutter projects on Atsign Platform. Includes Model Context Protocol integration, native AI Agent nodes, and CISO-verifiable architecture blueprints. Targeted at enterprise AI and security teams, developers, and product teams building agentic systems.
- Atsign Platform Sovereign messaging layer where identity is verified before connections occur. Provides peer-to-peer, end-to-end encrypted communications without requiring open inbound ports. Implements direct-trust architecture with zero-attack-surface networking for people, devices, and AI agents. Sold as a platform-level offering for enterprise and developer use.
- Atsigns
- NoPorts
- atSDK
Quantifiable outcome
- Functional MVP development time reduced from months to hours
- +6 more outcomes
Companies that use Atsign
Customer profileNamed customers5 records
Segments4 records
Ideal customer profiles4 records
Atsign technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration2 records
AI capability4 records
Feature8 records
Atsign partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- S-IMSYcoreStrategic partnership to deliver secure, cost-effective IoT solutions for remote device management targeting industrial and enterprise markets. The collaboration combines Atsign's NoPorts technology with S-IMSY's private cellular connectivity, enabling remote IoT device access without traditional open ports or VPNs while reducing deployment costs. The solution addresses growing security concerns in IoT deployments where conventional networking approaches fall short.
Scale indicators5 records
Recent moves6 records
Expansion highlights5 records
Atsign competitors and assessment
Company assessmentBroad incumbents
- Cloudflare: Cloudflare offers a broad zero-trust, edge security, and identity platform (Cloudflare One, Access, Tunnel) that overlaps with Atsign's NoPorts and direct-trust architecture, but as part of a much wider networking and CDN portfolio rather than as an agentic-AI-specialized solution.
- Zscaler: Zscaler is a major zero-trust networking platform that competes with Atsign's NoPorts for secure remote access use cases, but addresses it through a large cloud proxy fabric rather than peer-to-peer direct-trust connections.
- Okta: Okta is a leading identity and authentication provider whose traditional IdP model Atsign explicitly positions against. Both compete for CISO budget around workforce and customer identity, though Okta's model relies on centralized identity servers while Atsign uses decentralized cryptographic identities.
- CyberArk: CyberArk is a leading identity security and privileged access management vendor that competes for budget around machine and human identity, overlapping with Atsign's agentic AI identity use case as part of a much larger PAM portfolio.
Direct peers
- Tailscale: Tailscale provides zero-config WireGuard-based mesh VPN networking for developers and enterprises, addressing similar secure remote access and peer-to-peer connectivity problems to Atsign's NoPorts, though with a different cryptographic identity mechanism.
- ZeroTier: ZeroTier offers software-defined peer-to-peer networking for secure device connectivity, closely aligned with Atsign's NoPorts use case for IoT and remote access, though ZeroTier uses a different identity and consensus model.
- Teleport: Teleport delivers identity-aware, passwordless access to infrastructure, applications, and data, competing with Atsign's direct-trust architecture for engineering and security teams needing auditable zero-trust access.
- HashiCorp Boundary: HashiCorp Boundary provides identity-based secure remote access to infrastructure without exposing networks, directly addressing the same zero-trust, no-VPN problem that NoPorts targets, primarily for DevOps and infrastructure teams.
Emerging players
- Beyond Identity: Beyond Identity offers passwordless, cryptographic-identity-based authentication, overlapping with Atsign's decentralized identity model but focused primarily on workforce SSO and MFA rather than agentic AI infrastructure.
- Socket Supply Co. Socket Supply Co. builds peer-to-peer, offline-capable application infrastructure with embedded security, sharing philosophical overlap with Atsign's no-open-ports, peer-to-peer direct-trust architecture for app developers.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
Atsign social profiles
Digital presenceAtsign compliance and trust
Trust signalCompliance3 records
Atsign financial estimates
Financial estimateRevenue estimate
Valuation estimate
Atsign leadership team
Management profileNumber of profiles
Profiles7 records
Atsign funding detail
Funding detailFunding overview
Funding rounds3 records
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Atsign M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Atsign
What does Atsign do?
Atsign builds an open-source peer-to-peer infrastructure platform centered on cryptographic identities (Atsigns) and zero-trust connectivity. Its core offerings are the Atsign Platform (a sovereign messaging layer that verifies identity before any connection and eliminates open inbound ports), AI Architect (a visual tool that produces LLM prompts to generate secure-by-design agentic applications), and NoPorts (zero-trust remote device access without VPNs). Customers register Atsigns via a paid registrar and integrate the platform through the atSDK to build privacy-first, compliance-ready applications.
Is Atsign a public or private company?
Atsign is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Atsign founded?
Atsign was founded in 2019. It employs 1 to 10 people.
Where is Atsign based?
Atsign is headquartered in San Jose, United States, in the North America region.
How does Atsign make money?
Two revenue lines are on record. Custom Atsigns Registration and Licensing is the primary driver. The others are platform and Product Licensing.
Who are Atsign's main competitors?
Broad incumbents on record are Cloudflare, Zscaler, Okta and CyberArk. Direct peers are Tailscale, ZeroTier, Teleport and HashiCorp Boundary. Emerging players are Beyond Identity and Socket Supply Co..
Does Atsign have an API?
Yes. The atSDK is the software development kit for embedding the Atsign Protocol into new or existing software. It supports authentication, CRUD operations, notifications (real-time messaging), RPC (remote procedure calls), synchronization, and connection hooks. The Atsign MCP (Model Context Protocol) server is also available, enabling AI co-architecting with Claude - users can create complete blueprints using Claude connected to the Atsign MCP server. Developer documentation is at docs.atsign.com.
What industry is Atsign in?
Atsign's product category is Zero-Trust Identity and Secure Networking Platform. Its primary akta.pro industry code is BPAMAEAE, Authentication (MFA/Passwordless/Biometrics) Platforms, with a secondary code of FSAPACAG, Decentralized Identity (DID) & Identity Wallets (DID methods, DIDComm, identity agents). Its NAICS code is 5182 and its SIC code is 7372.