Launched2025-2026

Chronum

Autonomous SaaS for freelancer time tracking and invoicing: desktop and web with real-time sync.

React 19
TypeScript
Tauri
Rust
NestJS
PostgreSQL
Drizzle ORM
Puppeteer
Cloudflare R2
pgvector
WebSocket
Astro
Docker
Railway

Concept

Chronum owns one scenario and does it without bloat: a freelancer tracks billable hours per project and turns them into professional invoices. The same product ships as a cross-platform desktop app and as web — with an identical feature set, offline mode, and instant cross-device sync.

Engineering

Cross-platform desktop client on Tauri (Rust) for macOS / Windows / Linux — migrated from Electron for smaller size and native performance.
React 19 SPA with complex UI: an interactive timeline with drag-to-scroll and zoom, a command palette, and a live PDF preview with page navigation.
REST API on NestJS + PostgreSQL with Drizzle ORM; authentication via magic link, OAuth (Google, GitHub), and JWT with a desktop deeplink flow.
Server-side PDF generation with Puppeteer, file storage on Cloudflare R2, and 16-currency billing with rate updates and a Redis cache.
Semantic search across projects and tasks on pgvector; offline mode (PWA + IndexedDB) that syncs back up once the connection returns.
CI/CD, Docker containerization, deploy on Railway; a separate Astro landing with 20+ SEO pages (JSON-LD, green Core Web Vitals).

Interface

Chronum dashboard: cards for amount to invoice, awaiting payment, received, hours worked, and average rate; charts for income by project and time by category; below, a task table with an invoice-creation action. — Overview: tracked hours converted into money and ready to be invoiced.

Daily activity screen: a horizontal timeline with colour-coded session blocks by hour, a summary of tracked and billable time, a category donut chart, and a session table with project, period, and amount. — A day broken into sessions: every entry is tied to a task, a project, and a rate.

A Create Invoices window: a stepper across three clients — Pixelform Studio, Codeflow Labs, Frameshift Media; on the left a settings accordion with preset, number prefix, task selection, issuer and recipient details, taxes, and appearance; on the right a live PDF invoice preview broken down by task, hours, rate, and nested sessions. — Bulk invoicing: one pass across clients, a live PDF preview, and hours already broken down by task and rate.

Open full screen

Results

16: billing currencies with auto-updated rates
0: sessions lost offline: a local IndexedDB queue
3+1: platforms: macOS, Windows, Linux, and web

Concept

Engineering

Interface

Results

Tell me about your project