Free tool

Signal

Free, open-source encrypted messaging and calls from a nonprofit.

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Top pickFree, open-source encrypted messaging that is the safest default for sensitive work.

See how Signal fits your setup. Add the tools you already use.

Price

Free

Nonprofit offer

None found

Available in

🌍Anywhere

Suits

Volunteer-run · Small · Medium · Large

Great for

Teams and clients who need private messages, such as domestic violence, legal or human-rights services
Small teams who want a free secure group chat
Organisations working in risky environments
Free and ad-free
Strong privacy
Works across devices

Watch out for

Teams that need a shared inbox, records or admin controls
Anyone who needs bulk messaging to supporters
Organisations that must keep message records for compliance
No business or team admin tools
No shared inbox or message records
You and your contacts must install it

Problems it solves

“I need to message a vulnerable client without anyone reading it”“We need a secure group chat for our team with no budget”“Our staff use personal WhatsApp for client work and it's not safe”“How do I set up messages that disappear after a week”“We work in a country where our messages might be monitored”

About Signal+

Signal is a free messaging and calling app run by the Signal Technology Foundation, a US 501(c)(3). It uses end-to-end encryption by default, has no ads or trackers and works on phones and desktop. It is a strong choice for staff or clients who need private conversations, but it has no business tools, shared inbox or admin controls.

Pricing: Free for everyone. Funded by donations and grants, with no advertising.

Key features+

End-to-end encrypted messages, voice and video callsGroup chatsDisappearing messagesAndroid, iPhone, iPad, Windows, Mac and LinuxOpen-source protocol

Data & privacy+

Signal says it is an independent 501(c)(3) with end-to-end encryption by default. You register with a phone number.

How sure are we?+

Prices and offers confirmed on the vendor's own pages. Prices and nonprofit programs change often, so check with Signal before you commit. Rankings on Nonprofit Tools are never for sale.

Sources · last checked 2026-10-02