Signal

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ReviewAITools Score · 718 reviews8.9

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What is Signal?

Signal is a free, open-source messaging app developed by the nonprofit Signal Foundation, designed to prioritize user privacy and secure communication. Available on Android, iOS, Windows, macOS, and Linux, it offers end-to-end encrypted messaging, voice, and video calls, ensuring that only the intended recipients can access the content.

The app employs the Signal Protocol, a robust encryption standard also adopted by other major platforms. This protocol ensures that messages, calls, and shared media remain confidential and inaccessible to third parties. Signal also minimizes data retention, storing only essential information like account creation date and last connection time.

Signal’s features include group chats, disappearing messages, and the ability to send various media types. Users can also set up usernames, allowing communication without sharing phone numbers. The app’s commitment to privacy has made it a preferred choice for journalists, activists, and individuals seeking secure communication channels.

As a nonprofit, Signal operates without advertisements or tracking, relying on donations to fund its development. This model supports its mission to provide a secure and private messaging platform for all users.

Best for

Personal

Pricing

Starting at Custom · Subscription · Free tier available

Features

32 features that make Signal stand out.

Mobile Access
Activity Dashboard
End-to-End Encryption
Disappearing Messages
Group Video Calls
Voice Message Support
Media File Sharing
Screen Lock Option
Username Privacy
Sealed Sender Protocol
Message Editing
Scheduled Messaging

Signal alternatives

Tools buyers consider alongside Signal.

Frequently asked questions

Is Signal free to use?

Yes, Signal offers a free version with core features. You can upgrade to a paid plan when you need more capacity or advanced functionality.

How much does Signal cost?

Signal uses custom pricing tailored to each organisation. Contact their sales team for a quote based on your team size, modules and contract length.

What does Signal integrate with?

Signal ships with an open API for custom integrations. The vendor also publishes connectors for common business systems on request.

Who is Signal best suited for?

Signal is built for teams who need to standardise the workflow it covers — typically growing companies who have outgrown spreadsheets but don't yet need enterprise-grade procurement suites. The exact fit depends on company size, deal volume and compliance requirements.

How long does it take to onboard Signal?

Most teams are live on Signal within 2–6 weeks. Simpler implementations (small teams, default workflows) can be done in days; large enterprise rollouts with custom approval chains and ERP integration take longer.

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