Record every sale and every expense in seconds. No computer, no spreadsheets, no monthly fee. Built for business owners across the United States.
No account, no email required. Works on iPhone and Android.
You opened your business to do the work you’re good at — not to wrestle with spreadsheets. Then tax season arrives, and there it is: crumpled receipts, payments you can no longer place, and an accountant waiting on numbers you don’t have.
The problem is rarely discipline. It’s that bookkeeping tools are built for someone sitting at a desk, while most business owners are working out of a truck, a job site, a salon, or a kitchen. If the tool doesn’t fit in your pocket, it doesn’t get used.
Aztec Bookkeeping is the same annual ledger we give our clients, rebuilt as a phone app. It opens in two seconds, you log the entry, and you get back to your day.
At year end, one button produces the file your accountant needs. Nothing to retype, no receipts to dig out of the glovebox.
Money in and money out in 10 seconds. Amount, date, description and category, with 23 categories that line up with your business return.
Filter by month or view the full year, with money in, money out and net profit always in view.
Profit & Loss and Balance Sheet that calculate themselves as you record.
Enter starting and ending odometer; the app applies the IRS 2026 rate — 72.5¢ per mile January through June, 76¢ July through December.
Calculates the 6.25% state rate plus your local rate (8.25% cap) and applies the 0.5% timely filing discount.
Estimates self-employment and income tax, applies the safe harbor rule, and gives you all four due dates.
Everything is stored only on your phone. It never travels to a server, never passes through us, and is never shared. Aztec Project has no access to your figures.
That’s why the app includes a backup button. Use it monthly and save the file to your email, WhatsApp, or Google Drive.
Don’t look for it in the App Store or Google Play — it isn’t there, which is why it’s free. You install it straight from this page in under a minute. Once installed, it gets its own icon and works even without internet.
VERY IMPORTANT: if you got here from Facebook, Instagram, or WhatsApp, tap the three dots ( ⋮ ) and choose “Open in Safari” or “Open in Chrome.” Installing doesn’t work inside those apps. It’s the number one reason the button doesn’t appear.
Go to Settings and enter your business name, the year, and your beginning cash and bank balance.
Every sale and every expense, as it happens. Build the habit — it's the one thing that actually makes the difference.
In Settings, tap Download Excel (CSV) and send it to your accountant or file it yourself.
Nothing. It’s a tool Aztec Project makes available to business owners. No subscription, no free trial, no credit card.
Only the first time, to install it. After that it works with no signal.
No. It’s a record-keeping tool to keep your numbers current and walk into your accountant’s office prepared. If your business handles inventory, payroll, accounts receivable, or fixed assets, you’ll need full accounting software — we’re glad to point you in the right direction.
Entry tracking, reports, and mileage work in any state. The sales tax calculator is built on Texas rates.
They’re estimates to help you plan and set money aside. They are not tax advice and don’t replace your return. Always confirm with your preparer.
Yes. On the old phone use Save full backup; on the new one, Restore backup.
Entity formation, compliance, bookkeeping, payroll, and taxes. Aztec Project works with business owners across the United States.
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This application is a general-purpose record-keeping and estimating tool. It does not constitute accounting, tax, or legal advice, and does not create a professional-client relationship. Results are approximate and depend on the information you enter. Consult your accountant or tax preparer before making decisions or filing returns. Aztec Project LLC does not store or have access to the information you record on your device.
Aztec Project LLC · Rockwall, Texas · aztecproject.com
Business · Tax · Compliance