Open Source

Open-source Bitcoin tools and applications built for transparency and community collaboration.

Why We Recommend

Built by Blockstream. 100% open-source firmware and hardware. Unique 'Blind Oracle' PIN security model (no secrets stored on device when locked). Camera for air-gapped QR signing. Genuine Check hardware verification. Anti-Exfil protection against Dark Skippy attacks.

Services & Features

  • Air-gapped QR code signing
  • Stateless operation (SeedQR support)
  • Blind Oracle PIN security (nothing to steal from locked device)
  • Bitcoin and Liquid Network support
  • Multiple connectivity: USB, Bluetooth, QR codes
  • Jade Plus model with 66% larger screen and metal options

Why We Recommend

100% open-source (MIT license). No pre-built hardware to trust—build it yourself from generic components. Community-driven project since December 2020. Stateless design (no secrets stored on device). Reproducible builds for verification.

Services & Features

  • Air-gapped QR code signing
  • Stateless operation (all memory wiped on power off)
  • Dice roll entropy for trustless seed generation
  • SeedQR format support
  • Multisig support with Sparrow, Specter, BlueWallet, Nunchuk
  • BIP85 child seed generation

+1 more services

Why We Recommend

Fully open-source. Built by TFTC. No browsing data collected. Free to use.

Services & Features

  • Chrome extension
  • Brave extension
  • Firefox add-on
  • Real-time BTC price conversion
  • Multiple fiat currency support
  • Display in BTC or sats

Why We Recommend

Open-source. Backed by Ten31 and Erik Voorhees. 'Don't trust, verify' made practical.

Services & Features

  • StartOS
  • Bitcoin Core node
  • Lightning (LND/CLN)
  • BTCPay Server
  • Tor

Why We Recommend

SOC 2 Type II compliant. Powers Chipper Cash (50%+ BTC via Lightning).

Services & Features

  • Hosted Lightning nodes
  • Voltage Payments
  • BTCPay hosting
  • Developer APIs

Why We Recommend

Pioneer in Bitcoin-paid microtasks. Pledged $180K to Brink for Bitcoin developer funding. Open-source Sphinx Chat. Non-KYC sats for workers.

Services & Features

  • Microtask marketplace (instant Lightning pay)
  • Sphinx Chat (Lightning messaging)
  • AI + human workflow automation
  • Data labeling & annotation
  • Sphinx Bounties

Why We Recommend

Built by OpenSecret. Open-source server code. Secure enclaves with cryptographic attestation. Zero data retention. Listed in HRF AI for Individual Rights Toolkit.

Services & Features

  • End-to-end encrypted AI chat
  • Anonymous accounts (Bitcoin-only signup)
  • Private web search
  • Custom AI personality
  • Encrypted cross-device sync

Why We Recommend

Open-source. Integrated custodial Lightning wallet for easy onboarding. Nostr Wallet Connect (NWC) support for external wallets.

Services & Features

  • Nostr social feeds
  • Integrated Lightning wallet
  • Zaps (Bitcoin tips)
  • Content discovery
  • Desktop, iOS & Android apps
  • In-app sat purchases

Why We Recommend

GNU AGPLv3 licensed. Fully browser-based—all data stored locally. No server dependency. Anonymous payments via Nostr and Lightning.

Services & Features

  • Multi-provider AI support (OpenAI, Anthropic, xAI, etc.)
  • Browser-based development
  • Anonymous Lightning payments
  • Git integration
  • In-browser compilation

Why We Recommend

Built by ACINQ, creators of Eclair (one of the original Lightning implementations). Fully open-source. Runs a real Lightning node on your phone.

Services & Features

  • Splicing (single dynamic channel)
  • Taproot channels (15% cheaper, more private)
  • Trustless on-chain swaps
  • Multiple wallet support
  • NFC payments

Why We Recommend

Fully open-source (AGPL). Embedded LND node option. No KYC. OLYMPUS LSP for 0-conf channels.

Services & Features

  • Embedded Lightning node
  • Remote node management (LND, Core Lightning)
  • Zeus Pay (self-custodial Lightning address)
  • Simple Taproot Channels
  • Contact book & NFC payments

Why We Recommend

Fully open-source (MIT license). Built by Bull Bitcoin (founded 2013).

Services & Features

  • Bitcoin, Lightning & Liquid support
  • Non-custodial atomic swaps
  • Hardware wallet companion (Coldcard Q)
  • Recoverbull encrypted backup
  • Bull Bitcoin exchange integration (optional)

Why We Recommend

Open-source. Built on BDK (Bitcoin Dev Kit). OpenSats grant funded. No data collection.

Services & Features

  • Hot wallet with encrypted local storage
  • Hardware wallet support (Coldcard, Krux, TAPSIGNER)
  • PSBT signing via QR & NFC
  • BIP329 label sync (Sparrow compatible)
  • UTXO management

Why We Recommend

Open-source. Native iOS app. Cashu protocol uses Chaumian blind signatures — mint can't see who sends or receives.

Services & Features

  • Cashu ecash (Chaumian mint)
  • iMessage integration (send BTC in texts)
  • Lightning interoperability
  • Multiple mint support
  • Zero data collection

Why We Recommend

Originally Blockstream project, now by JAN3 (Samson Mow). Non-custodial. Uses Green Development Kit (GDK).

Services & Features

  • Bitcoin, Lightning & Liquid
  • Native USDt support (Liquid, Ethereum, Tron)
  • Asset swaps via Boltz
  • Prepaid Dolphin Card integration
  • 12-word seed backup

Why We Recommend

Founded 2017. Fully open-source (MIT license). Connect to your own Electrum server. No KYC.

Services & Features

  • Bitcoin & Lightning
  • Multisig vaults
  • Watch-only wallets
  • Hardware wallet support (Coldcard, Cobo)
  • Plausible deniability (fake wallets)

Why We Recommend

Open-source. Runs a full Lightning node on your device. Non-custodial from day one. Powers the Breez SDK used by developers worldwide.

Services & Features

  • Full Lightning node on device
  • Automatic channel management
  • Built-in Point of Sale
  • Podcast player (streaming sats)
  • Lightning address support
  • Offline payment notifications

Why We Recommend

Open-source. Web-based (no install needed). Uses Cashu protocol with Chaumian blind signatures for privacy.

Services & Features

  • Browser-based ecash wallet
  • Lightning send/receive
  • Multiple mint support
  • Offline token transfer
  • No signup required

Why We Recommend

Fully open-source (Apache 2). PSBT-native from the ground up. Supports all major hardware wallets. No data collection.

Services & Features

  • Single sig & multisig support
  • Hardware wallet coordination (Coldcard, Trezor, Ledger, etc.)
  • Full UTXO & fee control
  • Transaction editor & blockchain explorer
  • Whirlpool CoinJoin
  • Tor & own node support

Why We Recommend

Created in 2011. Fully open-source (MIT license). One of the oldest and most trusted Bitcoin wallets. Private keys encrypted and never leave your computer. Decentralized server network.

Services & Features

  • SPV verification (no full node needed)
  • Multisig support
  • Cold storage & watching-only wallets
  • Hardware wallet integration
  • Seed phrase recovery
  • Plugin system for extensions

+1 more services

Why We Recommend

Fully open-source. Built by Wizardsardine. Uses Miniscript for advanced recovery. Compatible with BitBox02, Coldcard, Ledger, Jade.

Services & Features

  • Timelocked recovery paths
  • Inheritance planning (no third party)
  • Decaying multisig
  • Taproot support
  • One-click node setup
  • Hardware wallet support

Why We Recommend

Fully open-source. Developed by Unchained Capital. Browser-based, runs locally. Stateless design — stores no data. BIP67 and BIP32 compliant.

Services & Features

  • Create multisig wallets (up to 7 keys)
  • Flexible quorum (2-of-3, 3-of-5, etc.)
  • Hardware wallet support (Trezor, Ledger, Coldcard, Hermit)
  • P2SH, SegWit, P2SH-P2WSH addresses
  • Connect to mempool.space, blockstream.info, or own node
  • Unchained vault recovery tool

Why We Recommend

Fully open-source. No ads, no tracking. Self-hostable. Integrated with 30+ wallets and services.

Services & Features

  • Real-time mempool visualization
  • Fee estimation
  • Transaction tracking
  • Block explorer
  • Mining pool analysis
  • Lightning explorer

+1 more services

Why We Recommend

Built by Blockstream. Fully open-source (Esplora). Self-hostable. No tracking.

Services & Features

  • Bitcoin block explorer
  • Liquid block explorer
  • Transaction lookup
  • Address monitoring
  • API access

Why We Recommend

Fully open-source. Used by Namecheap ($73M+ in BTC revenue). Powers Bitcoin payments for thousands of merchants worldwide. No KYC, censorship-resistant.

Services & Features

  • Point-of-Sale app
  • Invoice management
  • Payment links & buttons
  • Crowdfunding campaigns
  • Lightning Network support
  • Hardware wallet integration

+2 more services

Why We Recommend

Fully open-source. Maintained by industry-leading Bitcoin developers. Powers wallets like Cove, Envoy, and Mutiny. Funded by Spiral, OpenSats, and the BDK Foundation.

Services & Features

  • Rust wallet library
  • Swift & Kotlin bindings
  • WASM support
  • Flexible chain sources (Electrum, Esplora, Bitcoin Core RPC)
  • Descriptor-based wallets
  • Coin selection algorithms

Why We Recommend

Fully open-source. Maintained by Spiral (Block). Powers apps like Mutiny Wallet and Cash App. Battle-tested in production.

Services & Features

  • Rust Lightning library
  • Swift & Kotlin bindings
  • Custom channel management
  • Flexible persistence & networking
  • BOLT spec compliant
  • LSP integration support

Why We Recommend

Fully open-source. Implements BIP 78 (PayJoin V1) and BIP 77 (PayJoin V2). Funded by OpenSats and HRF.

Services & Features

  • PayJoin V1 (BIP 78) support
  • PayJoin V2 (BIP 77) serverless protocol
  • Rust library with bindings
  • Sender & receiver implementations
  • Transaction cut-through

Why We Recommend

Fully open-source. The most widely used Rust Bitcoin library. Foundation for BDK, LDK, and many other projects. Maintained by a dedicated team of Bitcoin developers.

Services & Features

  • Bitcoin protocol primitives
  • Transaction serialization/deserialization
  • Script parsing & creation
  • BIP32/39/340 support
  • Miniscript & descriptors
  • PSBT handling

Why We Recommend

Open-source SDK from Breez. Self-custodial by default with keys on user's device. Powers Lightning payments without requiring node management. Multiple implementations available (Spark and Liquid).

Services & Features

  • Lightning payment integration
  • Multiple payment protocols (BOLT11, LNURL-Pay, Lightning addresses)
  • Self-custodial by default
  • Multi-platform bindings (JavaScript, Kotlin, Swift, Go, Python, React Native, Flutter, C#)
  • Spark and Liquid implementations
  • Automatic channel management

Why We Recommend

100% community-funded. Forked from Samourai Wallet source code (April 2024). GNU GPL v3 licensed. Tor integration with no DNS dependencies.

Services & Features

  • Whirlpool coinjoin (ZeroLink)
  • Stowaway & STONEWALLx2 P2P coinjoins
  • PayNym (BIP47 payment codes)
  • Tor & Dojo node integration
  • Ricochet transactions
  • Coin control & UTXO labeling

+1 more services

Why We Recommend

MIT licensed open-source. Backed by Jack Dorsey ($5M). Censorship-resistant decentralized social network.

Services & Features

  • Decentralized social feed
  • Lightning zaps (Bitcoin tipping)
  • End-to-end encrypted DMs
  • Multi-relay support
  • iOS, macOS, Android, desktop (Notedeck)

Why We Recommend

Bitaxe is a fully open-source Bitcoin mining hardware project with no company or formal organization behind it—just a decentralized community of developers and contributors. Every aspect of the design is transparent: hardware schematics, PCB layouts, and firmware are publicly available for anyone to inspect, audit, or modify. This radical transparency means there are no hidden backdoors or proprietary code that users must blindly trust.

The project emerged from the Open Source Miners United (OSMU) community, which promotes decentralized, transparent mining hardware development. Because Bitaxe is mining hardware rather than a custodial service, it never holds your private keys or Bitcoin—your funds remain in your own wallet at all times. Security is determined by your own setup rather than trusting a third party with custody.

The community has demonstrated responsible security practices. When a CSRF vulnerability was discovered in early 2024 that could allow attackers on the same network to change mining pool settings, the maintainers quickly released a firmware patch and publicly communicated upgrade instructions. Build quality depends on your chosen vendor or your own assembly from open designs.

Services & Features

  • Open-source ASIC miners (400 GH/s–2 TH/s)
  • Solo and pool mining support
  • Lightning Network payouts via pools
  • WiFi standalone operation
  • Multiple model options (Ultra, Gamma, Hex)
  • SHA256d mining (BTC, BCH, BSV)

+2 more services

Why We Recommend

Bitcoin Keeper is a fully non-custodial, open-source wallet where users maintain complete control of their private keys. The company never has access to user funds and cannot sign or authorize transactions on behalf of users.

The application code is publicly available on GitHub (bithyve/bitcoin-keeper), allowing independent security review by the community. Bitcoin Keeper provides signed checksums and detached GPG signatures for APK verification, enabling users to confirm they are running authentic, unmodified software. WalletScrutiny has included Bitcoin Keeper in their build verification efforts, indicating attention to transparency.

The wallet supports connecting to your own Bitcoin node, eliminating reliance on third-party servers for transaction verification. Multi-key vault configurations distribute signing authority across multiple devices and locations, removing single points of failure. The app is Bitcoin-only, avoiding the complexity and attack surface of multi-asset wallets.

Services & Features

  • Multisig vaults (2-of-3 to 3-of-5)
  • Hardware wallet integration
  • Inheritance planning with time-locks
  • UTXO and fee management
  • Collaborative custody tools
  • Canary wallet monitoring

+2 more services