How Long Will My Money Last Calculator vs ZeraBooks: Which Is Better in 2026?

A free, no-sign-up retirement drawdown calculator that turns a starting balance and monthly spending gap into a transparent money-runway scenario. It models one level monthly withdrawal, a constant nominal annual return, a target duration, and beginning- or end-of-month withdrawal timing. Results include the estimated runway, target gap, target-fit monthly amount, and a projected balance chart and annual table. Inflation, taxes, fees, deposits, and market swings are not modeled, so the result is an educational scenario rather than a forecast or guarantee.
What problem it solves
It turns a savings balance and monthly withdrawal need into an auditable runway estimate, while showing how the same assumptions compare with a chosen target duration.
Pricing
Free; no sign-up required.

ZeraBooks is AI bookkeeping software that runs your books completely automated.

Most small businesses don't need another tool to do their books in. They need the books done. That's what ZeraBooks is for. You run your own bookkeeping without sitting there categorizing transactions for hours. Bookkeepers use it to run every client's books from one login. Accounting firms use the same engine to process client bank, card, check and investment statements at volume, with custom workflows built for how the firm works.

Here's how it works. You upload your bank and credit card statements as PDF or CSV. ZeraBooks reads every line and categorizes each transaction from your own reviewed history, not a generic guess. Then it reconciles every month against the statement's printed opening and closing balances, to the cent, and closes the month. When it isn't sure about something, it asks you instead of guessing. Every change it makes can be undone.

What you end up with is a real set of books: general ledger, profit and loss, balance sheet, cash flow statement, trial balance, bills, invoices and month-end close. Bookkeepers get multi-client management. There's also Ask Zera, an AI bookkeeping agent you can ask about your numbers in plain English.

On accuracy: the extraction engine is 99% accurate. After a couple of months of history, ZeraBooks categorizes 99.6% of transactions correctly.

It also handles document processing. Bank, credit card, check and investment statements convert to Excel or CSV, including QuickBooks-, Xero- and Sage-ready CSV files. That's part of the paid subscription.

Pricing is simple. $79 USD a month billed annually, or $149 billed monthly. There's a 7-day free trial and no free plan. Setup is free, and we catch up past months (up to 12) for free too. Bookkeepers with a lot of clients can get volume pricing on a call.

What it doesn't do, so you know up front: no live bank feed, no payroll, and no mobile app. It works from the statements you upload.

What problem it solves

Small business owners and bookkeepers spend hours every month typing up bank statements, categorizing transactions and chasing reconciliation differences. Owners fall months behind. Bookkeepers can only take on so many clients. ZeraBooks does that work: it reads the statements, categorizes, reconciles each month to the bank's printed balances and closes the month.

Alternatives & competitors

An alternative to QuickBooks Online, Xero, Puzzle and Digits for people who want the books done for them, not another tool to do them in.