CatalystAgile
Receipt & Expense Logger

Log every receipt and mileage trip in one place. We roll it up by category and month, total the tax-deductible amount and the sales tax you paid, and hand you a clean CSV for your accountant.

✓ Works offline ✓ Nothing leaves your device ✓ Accountant-ready CSV
How it works — quick guide
  1. Add receipts with + Receipt and trips with + Mileage — date, vendor, category, amount or miles, sales tax and deductible %.
  2. Set your mileage rate and marginal tax rate.
  3. Read the rollup — deductible total, estimated tax saved, deductible by category and logged by month.
  4. Keep it audit-ready: every row dated and categorised.
  5. Export the line-by-line Ledger CSV for your accountant.

Dual engine: the calculator runs fully offline and produces every number itself. The optional Assistant tab adds a Groq AI specialist that only explains or drafts from those numbers — it never changes them. Add a free Groq key to switch it on.

Entries

$

Rollup

Deductible
Est. tax saved
Sales tax paid

Deductible by category

Logged by month

Optional AI specialist. Add your Groq key for a bookkeeping read on the period. It never changes the numbers — the logger works fully offline without it.

AI specialist — bookkeeping assistant

The AI specialist only interprets the numbers this app already computed — it never changes them. Your key is stored only in this browser and sent only to Groq. This is not tax advice.

Export the full line-by-line ledger as CSV for your books, or save a period summary on this device.

Export current entries

Every row with date, vendor, category, amount, tax and deductible — ready to import.

Saved periods