River by Asynarch — The Accounting, as it happens

River is the autonomous accounting engine built by Asynarch. Tell River what happened. It does the rest.

Website: https://asynarch.com

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Overview

River understands the accounting behind everyday business activity. You only need to describe what happened—in River or on WhatsApp—and River works out how that should be recorded:

• Tax Invoicing: Composes GST-compliant sales invoices, computes SAC/HSN codes, and debits accounts receivable.
• Vendor Bills & ITC: Extracts vendor invoices, capitalizes fixed assets, and claims Input Tax Credit (ITC).
• Bank Reconciliation & TDS: Matches bank statements against receivables, accounts for Section 194J TDS withholdings, and updates ledger balances.

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Core Invariants

1. Every entry is checked before it is posted.
2. GST and TDS are recorded correctly.
3. Locked periods reject new entries.
4. Corrections keep their history.
5. Every report comes from the transactions in the books.

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Tech Stack

• Framework: Next.js (App Router, Turbopack)
• Motion & Animation: GSAP (gsap, ScrollTrigger, Draggable) + Lenis Smooth Scroll (lenis)
• Styling: Tailwind CSS + Vanilla CSS Custom Properties
• Typography: Fraunces (Display), Inter (Body UI), IBM Plex Mono (Tabular Numbers)

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Development

# Install dependencies
npm install

# Run local development server
npm run dev

# Build production bundle
npm run build

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Routes

• / — River landing page with interactive software simulators & draggable desktop canvas.
• /about — About Asynarch and the River story.
• /api/waitlist — Early access waitlist submission endpoint.