For years, the crypto world has been trying to make Bitcoin payments feel as natural as sending a text message. Radar Chat, which launched in early July 2026, is taking that idea literally by forking Signal, the gold standard of encrypted messaging, and bolting on self-custodial Bitcoin Lightning payments.

The result is an app where you can argue with your friends about politics over end-to-end encrypted chat and then immediately settle a dinner bet in satoshis. All without opening a separate wallet app or handing your private keys to anyone.

What Radar Chat actually does

Radar Chat is built on the Signal Protocol, the same encryption framework that powers Signal’s famously private messaging. But where Signal stops at text, voice, and video, Radar Chat adds a payments layer using Bitcoin’s Lightning Network.

Lightning transactions settle in under a second. In English: you can send Bitcoin to someone faster than they can type “thanks.”

The app is fully self-custodial, meaning users hold their own keys. It includes seed phrase recovery and encrypted backups, the standard toolkit for anyone who’s ever sweated through the process of securing a crypto wallet. The difference here is that these features are embedded directly into a messaging interface that most privacy-conscious users already know how to navigate.

Radar Chat is free, open-source, and ad-free, with no trackers or subscriptions. It’s available on both iOS and Android. And here’s a detail that matters more than it might seem at first glance: the app is compatible with existing Signal users, so you don’t have to convince your entire contact list to download yet another messaging app before you can actually use the thing.

The team behind the fork

Radar Chat, Inc. is a separate entity, but the fingerprints of the Cake Wallet team are all over it. Seth for Privacy, who serves as COO and VP of Cake Wallet, is deeply involved. Vikrant Sharma serves as CEO of Radar Chat.

Cake Wallet brings roughly 2 million users to the table, a meaningful base of privacy-focused crypto users who represent the exact demographic Radar Chat is targeting. The team has been clear about their philosophy: this isn’t an app built exclusively for Bitcoin maximalists. The emphasis is on usability and privacy for everyday users.

The project also contributes financially to the Signal Foundation, which positions Radar Chat as a complementary addition to the Signal ecosystem rather than a hostile fork. The Signal Foundation doesn’t offer Lightning payments, and Radar Chat isn’t trying to replace Signal’s core mission. It’s layering on functionality that Signal has shown no interest in adding itself.

Why this matters for Bitcoin and Lightning adoption

Previous attempts to merge payments and messaging in crypto have generally suffered from one of two problems. Either the messaging was an afterthought bolted onto a wallet, or the payments required users to trust a custodian with their funds. Radar Chat addresses both by starting with a battle-tested messaging protocol and adding genuinely self-custodial payments on top.

If you’re already chatting with someone and can send them Bitcoin without opening a separate application, the barrier to actually using Lightning for peer-to-peer payments drops significantly. Radar Chat’s success will ultimately be measured not by how many Bitcoin enthusiasts download it, but by how many Signal users who never thought about Lightning payments start sending sats between messages.