Brightside

Brightside is a mobile-only self-custody trading app whose execution layer runs on Lighter's zero-knowledge order book, centred on zero-fee perpetuals and spot. Keys are held by a device-side wallet, deposits can be made by fiat, card or Apple Pay, and quotes, routing and estimated fees are laid out in full before signing, with users able to cancel and re-quote.

Order entry comes in Lite and Pro modes with one-tap switching. It targets fragmentation: some perpetual protocols require signatures, others require depositing into designated intent addresses first, others fill straight from the wallet, and depth is scattered across multiple chains so large orders get eaten by slippage. Brightside aggregates liquidity from those venues at the app layer and presents a unified margin view, adding limit orders, recurring buys, price alerts and entry points to lending and liquidity pools. It launched on the App Store on 16 December 2025, and in January 2026 added LIT perpetuals at up to 5x leverage.