hantoniu

Building tools for people who value privacy and control.

Philosophy

Privacy as default. Your data is encrypted before it leaves your device. No exceptions.
User sovereignty. No accounts, no sign-ups, no centralized servers. You own everything.
Minimal dependencies. The fewer third parties involved, the fewer points of failure or compromise.
Open source. All code is public and auditable. Trust is verified, not assumed.
Practical. These aren't experiments. They solve real problems.

Mobile

Kokoro

Heart rate monitoring for Android. Connects to BLE chest straps for 24-48 hour Holter recording, HRV tracking, and training load analysis. 100% local storage.

Recovery trends with morning/bedtime HRV
Training load tracking (CTL/ATL/TSB)
Raw ECG streaming via Polar H10

Source Install via Obtainium

Splitex

Privacy-first expense splitting on EVM blockchains. End-to-end encrypted with client-side cryptography. No backend servers, just your wallet.

ECIES encryption with ChaCha20-Poly1305
120+ currencies with real-time conversion
Deployed on Arbitrum One

Source Install via Obtainium

CLI

subctl

Command-line interface for Substrate-based blockchains. Manage wallets, stake tokens, vote on governance, and explore on-chain data without browser extensions.

Staking, nomination pools, and governance
Block explorer with JSON output for scripting
Encrypted keyring with AES-256-GCM

Source

netmon

Lightweight network monitoring for Linux. Checks packet loss across 500+ hosts concurrently and sends push notifications when issues arise.

Zero external dependencies
Async architecture on single thread
MTR diagnostics on failure

Source

Services

smold

Smoldot light client daemon for Substrate-based blockchains. Runs as a system service, exposing chains via Unix sockets. No centralized RPC providers.

8 chains: relay chains + Asset Hubs
Lazy loading on first connection
Works with PAPI and Substrate tools

Source

clmrwrds

Automated staking rewards claimer for Polkadot and Kusama. Runs as a service, checks for pending rewards, and claims via subctl.

Interval or cron scheduling
Direct staking and nomination pools
Push notifications via ntfy.sh

Source