Open source · Self-hosted
Automatically categorize transactions, track subscriptions, estimate taxes, and monitor your portfolio. Powered by Claude, OpenAI, or fully local with Ollama.
Today
2025 tax estimate
RSU vesting tax impact
Previous
Audit SaaS subscriptions
Home office deductions
January spending review
You
Estimate my taxes for 2025
nullbook
2025 Federal Tax Estimate
Single
Estimated Refund
+$2,847.00
Income
Gross Income$295,000.00
AGI$271,500.00
Taxable Income$256,500.00
Deductions
Standard Deduction$15,000.00 ✓
Itemized Deductions$14,200.00
Tax Brackets
10%12%22%24%32%
Tax Breakdown
Ordinary Income Tax$53,028.00
Total Federal Tax$53,028.00
Total Withheld-$55,875.00
Effective Rate: 18.0% Marginal Rate: 32%
This is an estimate only. Consult a tax professional for official filing.
You're looking at a $2,847 refund for 2025. The standard deduction saves you more than itemizing ($14,200). Your 401k contributions brought AGI down to $271,500. Most of your income falls in the 24% and 32% brackets.
Ask anything about your finances...
What it does
The boring parts,
fully automated
Nullbook tracks your accounts, categorizes spending, and flags what matters. You just ask questions.
Spending Intelligence
Every transaction is categorized automatically using AI. See exactly where your money goes, and spot patterns you'd never catch on your own.
Subscription Tracking
Surfaces every recurring charge across all your accounts. Price increases, forgotten trials, services you stopped using. It's all visible.
Tax Estimation
Finds deductions in your transactions automatically. Estimates your taxes for any filing status and generates Schedule C if you're self-employed.
Portfolio Monitoring
Track your holdings with gain/loss calculations, allocation breakdowns, and daily price updates. Ask questions in plain English.
Receipt Processing
Drop a photo of any receipt into the chat. Merchant, amount, and line items are extracted instantly and matched to your transactions.
Email Scanning
Connect Gmail or any IMAP inbox. Purchase confirmations, digital receipts, and bills are picked up automatically.
Smart Alerts
Unusual charges, upcoming bills, low balances, new fees. Get a heads-up before they become problems.
Data Import
Import CSV, OFX, or QIF files from any bank, or connect Plaid for automatic sync. Works with whatever your bank exports.
See it in action
Your money, explained
Ask anything about your finances and get real answers backed by your actual data.
Today
401k allocation check
February spending
Previous
Audit SaaS subscriptions
Import Schwab CSV
Home office deductions
You
Where did my money go last month?
nullbook
You spent $7,284 in January. Here's the breakdown:
Housing$3,450.00
Food & Dining$1,284.00
Transportation$485.00
Software & SaaS$347.00
Travel$1,240.00
Shopping$478.00
Total$7,284.00
DoorDash and Uber Eats were $612 of that, up 38% from December. Also, you haven't used Figma in 3 months but you're still paying $15/mo. Want me to draft a cancellation email?
Ask anything about your finances...
Your data stays yours
Self-hosted.
You're in control.
Everything runs on your computer. Your financial data lives in a local SQLite database — no cloud storage, no tracking. Powered by Claude, OpenAI, or fully local with Ollama.
BYOK
Use your own API key
Get started
One command to install
curl -fsSL https://nullbook.ai/install.sh | bash
irm https://nullbook.ai/install.ps1 | iex
or git clone and make setup
Requires Python 3.11+, Node 18+.
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