Signal Foundation
Signal Foundation is a US 501c3 nonprofit that operates Signal Messenger, a free, open source end-to-end encrypted messaging app used by hundreds of millions globally. Founded in 2018 with $50M from Brian Acton, it is sustained entirely by user donations with no advertisers or investors.
- Company typePrivate
- Founded2018
- HeadquartersMountain View, United States
- Headcount11–50
- GTM typeB2C
- OfferingSoftware
What Signal Foundation does
Signal Foundation is a US 501c3 nonprofit organization established in February 2018 to support Signal Messenger, an end-to-end encrypted messaging application originally created by Moxie Marlinspike in 2012. The Foundation was capitalized with a $50 million personal investment from WhatsApp co-founder Brian Acton and is governed by a board that includes Brian Acton, Meredith Whittaker (President), Jay Sullivan, Katherine Maher, and Amba Kak, with Moxie Marlinspike serving as Founder (Emeritus). Its mission is to protect free expression and enable secure global communication through open source privacy technology.
Signal Messenger is the Foundation's flagship product: a free, cross-platform end-to-end encrypted messaging application available on Android, iOS, Windows, Mac, and Linux, with a localized interface in more than 40 languages. The application's cryptographic layer is built on the Signal Protocol, which has not been broken in the product's history and which has been adopted by other major messaging services including WhatsApp, Google Messages, Skype, and Facebook Messenger's Secret Conversations. The Foundation operates with no advertisers, no investors, and no paid product tiers, and is sustained entirely by donations from users. Revenue mechanics are donation-only; there is no subscription, advertising, or in-app purchase model, and there are no disclosed enterprise contracts.
The Foundation distributes Signal Messenger through self-serve downloads from signal.org, Google Play, and the Apple App Store, and grows primarily through word-of-mouth, open source community engagement, and earned media generated by high-profile privacy incidents — most notably the 2025 SignalGate episode, which produced the app's largest US download surge, and the April 2026 phishing attack against approximately 300 German user accounts, in which Signal's encryption itself was not compromised. The Foundation has taken an explicit public stance against encryption backdoors, opposing the EU Chat Control regulation, the UK's Online Safety Act, and Canada's Bill C-22, and has stated it will exit those markets rather than weaken its encryption architecture. Customer segments are horizontal and consumer-led, including privacy-conscious individuals, general global consumers, and government officials and politicians, with no paid enterprise tier or anchor account structure.
Signal Foundation firmographics
Firmographics- Name
- Signal Foundation
- Legal name
- Signal Technology Foundation
- Website
- https://signalfoundation.org
- Company type
- Private
- Founded year
- 2018
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Signal Foundation is a US 501c3 nonprofit that operates Signal Messenger, a free, open source end-to-end encrypted messaging app used by hundreds of millions globally. Founded in 2018 with $50M from Brian Acton, it is sustained entirely by user donations with no advertisers or investors.
- Ownership category
- akta.pro rank
Signal Foundation industry classification
Industry- Product category
- Secure Messaging Software
- NAICS
- Wired and Wireless Telecommunications (except Satellite) (5171)
- SIC
- Communications Services, Nec (4899)
- akta.pro primary industry
- Secure/Encrypted Messaging (BPAMACAG)
Keywords
Where Signal Foundation is headquartered
LocationHeadquarters
- HQ city
- Mountain View
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Signal Foundation business model
Business model- GTM type
- B2C
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Infrastructure, Operations, Marketing or Sales
Revenue model
- Donations and User Contributions: Signal is a nonprofit with no advertisers or investors, sustained only by people who use and value it. The organization relies on community donations to provide Signal Messenger as a free app to millions worldwide.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free for Everyone |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels5 records
Signal Foundation product offering
Product offeringCore offering
Signal Foundation operates Signal Messenger, a free end-to-end encrypted messaging application available on Android, iPhone/iPad, Windows, Mac, and Linux. The nonprofit develops and maintains the Signal Protocol, encryption architecture, infrastructure, and open source app code, ensuring user data remains inaccessible to anyone including Signal itself. The organization is sustained entirely by community donations, with no advertisers, investors, or paid tiers.
Product overview
Signal Foundation operates Signal Messenger as its single flagship product — an end-to-end encrypted messaging application focused on privacy. The organization is structured as a 501c3 nonprofit without advertisers or investors, supporting Signal's development and ongoing operations since its founding in 2018 to support the app that originated in 2012.
Differentiator
Problem solved
Functional benefit
Brands
- Signal Messenger: The flagship end-to-end encrypted messaging application developed by Signal Foundation.
Products and services
- Signal Messenger End-to-end encrypted messaging application for individuals worldwide, available free on Android, iPhone/iPad, Windows, Mac, and Linux. Protects user privacy by ensuring data stays out of anyone's hands including Signal's own, with no advertisers or investors. Offers secure private messaging, voice calls, file sharing, and group communications.
Quantifiable outcome
- Signal reached its biggest US download surge following SignalGate in 2025, with ongoing global growth across Europe, South America, and South Asia driven by privacy concerns.
- +1 more outcomes
Companies that use Signal Foundation
Customer profileNamed customers3 records
Segments3 records
Ideal customer profiles2 records
Signal Foundation technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Signal Foundation partnerships and signals
Strategic signalScale indicators3 records
Recent moves8 records
Expansion highlights5 records
Signal Foundation competitors and assessment
Company assessmentDirect peers
- Wire: Wire is an end-to-end encrypted messaging and collaboration platform used by governments and enterprises. It targets a similar secure-communications need as Signal, particularly for organizational and high-security use cases.
- Wickr (Amazon): Wickr (acquired by Amazon in 2021) provides end-to-end encrypted messaging with self-destructing messages, targeting enterprises and government/security teams. It is a direct competitor to Signal in the secure-messaging category.
- WhatsApp: WhatsApp is the world's most-used messaging app and directly competes with Signal Messenger on private messaging. Notably, WhatsApp itself uses the Signal Protocol for its end-to-end encryption — the technology co-developed by Signal's founders.
- Element (Matrix): Element is the commercial steward of the open-source Matrix protocol, offering end-to-end encrypted messaging with a federated architecture. It overlaps directly with Signal on open-source, privacy-first messaging for consumers, governments, and enterprises.
- Telegram: Telegram is a global messaging platform with hundreds of millions of users and a strong focus on privacy and security, including Secret Chats. It competes head-to-head with Signal for privacy-conscious consumers and political/activist user segments.
- Threema: Threema is a Switzerland-based end-to-end encrypted messaging app that emphasizes privacy, anonymity, and data sovereignty. It is a direct peer targeting the same privacy-conscious consumer and European government/enterprise segments.
- Apple iMessage: iMessage is Apple's end-to-end encrypted messaging service built into iOS, macOS, and watchOS. It is a primary direct competitor for Signal among consumers in the Apple ecosystem, offering comparable end-to-end encryption with deep platform integration.
Emerging players
- Session: Session is an open-source, privacy-focused messaging app that routes messages through an onion network without requiring phone numbers. It targets the same privacy-conscious segment as Signal but with a smaller user base and more niche positioning.
- Viber: Viber is a global messaging app offering end-to-end encrypted chats and calls. It competes with Signal in the broader consumer messaging market, particularly in Eastern Europe, Asia, and emerging markets.
- Keybase (Zoom): Keybase, acquired by Zoom, offered end-to-end encrypted messaging and file sharing with a focus on cryptographic identity. It overlaps with Signal's secure-messaging proposition for tech-savvy users.
Market position
Strengths5 records
Weaknesses4 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Signal Foundation social profiles
Digital presenceSignal Foundation financial estimates
Financial estimateRevenue estimate
Valuation estimate
Signal Foundation leadership team
Management profileNumber of profiles
Profiles6 records
Signal Foundation subsidiaries and ownership
Company hierarchySubsidiaries1 record
Signal Foundation funding detail
Funding detailFunding overview
Funding rounds2 records
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Signal Foundation 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 Signal Foundation
What does Signal Foundation do?
Signal Foundation operates Signal Messenger, a free end-to-end encrypted messaging application available on Android, iPhone/iPad, Windows, Mac, and Linux. The nonprofit develops and maintains the Signal Protocol, encryption architecture, infrastructure, and open source app code, ensuring user data remains inaccessible to anyone including Signal itself. The organization is sustained entirely by community donations, with no advertisers, investors, or paid tiers.
Is Signal Foundation a public or private company?
Signal Foundation is a private company. It is classified as nonprofit foundation owned and is currently operating.
When was Signal Foundation founded?
Signal Foundation was founded in 2018. It employs 11 to 50 people.
Where is Signal Foundation based?
Signal Foundation is headquartered in Mountain View, United States, in the North America region.
How does Signal Foundation make money?
One revenue line is on record: donations and User Contributions.
Who are Signal Foundation's main competitors?
Direct peers on record are Wire, Wickr (Amazon), WhatsApp, Element (Matrix), Telegram, Threema and Apple iMessage. Emerging players are Session, Viber and Keybase (Zoom).
Does Signal Foundation have an API?
No public API is recorded for Signal Foundation.
What industry is Signal Foundation in?
Signal Foundation's product category is Secure Messaging Software. Its primary akta.pro industry code is BPAMACAG, Secure/Encrypted Messaging. Its NAICS code is 5171 and its SIC code is 4899.