Interactive Recipes · Zero Cloud Egress

Data Preprocessing in Action

Real datasets, instant in-browser execution, and zero bytes leaving your device. Explore 5 verified workflows running on DuckDB-WASM.

Merge & Discrepancy Gate
Finance & Auditing

Dual-Source Excel Financial Ledger Reconciliation

Combine two disparate workbooks (Sales Ledger vs Bank Settlement), strip currency symbols, join on invoice IDs, and isolate reconciliation variances in 42ms.

Input Scale50,000 + 49,850 rows
Execution Latency42ms
RAM Footprint4.8 MB (Arrow Columnar)
Privacy Guarantee Zero Egress (Local)
The Challenge

Finance teams frequently receive two disconnected workbooks every month: internal sales invoices (with messy strings like "$1,450.00" and trailing whitespace) and third-party bank clearance records. Manual VLOOKUP in Excel freezes on 50,000+ rows, fails on formatting mismatches, and exposes confidential revenue figures to third-party cloud tools.

The RTIO In-Browser Fix

RTIO imports both Excel workbooks locally via DuckDB-WASM, strips currency symbols and whitespace, joins on "invoice_id", computes the exact discrepancy variance in a new derived column, and filters for accounting audits without sending a single byte outside the browser.

Input Data Sources (Raw / Messy)Original formatting
Sales Ledger Workbook (Sales_Ledger_Q3.xlsx - 50k rows)Internal ERP Export
invoice_idclient_namegross_amount_strinvoice_date
INV-2024-001 Apex Logistics $14,250.0009/15/2024
INV-2024-002BioHealth Labs$8,120.5009/16/2024
INV-2024-003Crestline Media$22,000.0009/17/2024
INV-2024-004DataPoint Inc$3,400.0009/18/2024
Bank Settlements Workbook (Bank_Settlement_Q3.xlsx - 49.8k rows)Bank Treasury Export
invoice_refcleared_amount_strsettlement_datefee_deducted
INV-2024-001$14,250.002024-09-17$0.00
INV-2024-002$8,095.502024-09-18$25.00
INV-2024-003$22,000.002024-09-19$0.00
INV-2024-004$3,400.002024-09-20$0.00
Cleaned Output (Vectorized DuckDB-WASM Table)* Highlighted columns are newly computed in-browser
Reconciled Audit Table (audited_ledger.parquet)Ready for Instant Parquet Export
invoice_id client_name gross_amount cleared_amount reconciliation_variance Newaudit_status Newsettlement_days New
INV-2024-001Apex Logistics14250142500RECONCILED2
INV-2024-002BioHealth Labs8120.58095.525DISCREPANCY_FLAG2
INV-2024-003Crestline Media22000220000RECONCILED2
INV-2024-004DataPoint Inc340034000RECONCILED2
Automated Steps:✓ Trim Whitespace✓ Currency Symbol Extraction✓ ISO-8601 Date Normalization+ reconciliation_variance+ audit_status

Have your own messy multi-source spreadsheets?

Drop your Excel or CSV files directly into the RTIO visual canvas. Free unlimited local compute. Zero data leaves your device.