Making Bitcoin accessible to everyone, freedom should know no borders.
Focused on privacy, security and usability for day-to-day Bitcoin transactions.
Start using Grimm App
Wallet Features
Experience true Bitcoin sovereignty with a fully self-custodial Lightning wallet powered by Breez SDK.
Instant Lightning Payments
Send and receive Bitcoin in seconds with Lightning. No channel management, no complexity, just fast, borderless payments.
Full Self-Custody
You control your keys, you control your Bitcoin. Enjoy complete financial independence with a non-custodial design.
Enhanced Privacy
Your data, your business. Enjoy private transactions and local wallet management without third-party tracking.
Smart Fee Optimization
Let the wallet automatically select the best route and fee for your Lightning transactions, efficient and fair every time.
Seamless Backup & Recovery
Secure your wallet with encrypted local backups. Restore anytime, anywhere, without compromising your keys.
Powered by Breez SDK
Built on the trusted Breez infrastructure for seamless Lightning integration, reliability, and scalability.
Frequently Asked Questions
Everything you need to know about Grimm App
What is Bitcoin?
Bitcoin is a decentralized digital currency that allows peer-to-peer payments without needing a central bank or intermediary. Transactions are recorded on a public ledger called the blockchain and can be used to send, store, or grow value globally.
What is the Lightning Network?
The Lightning Network is a layer-2 solution built on top of Bitcoin, enabling instant and low-cost transactions. It’s designed for micro-payments and fast, everyday Bitcoin transfers.
What is a self-custodial wallet?
A self-custodial wallet means you own and control your private keys and therefore your Bitcoin. Grimm App never has access to your funds; you are fully in charge of your money.
Engineering Sovereignty and Open Source
We build tools and infrastructure that empower you to hold and use Bitcoin freely.