Features

Five things, done patiently.

We didn’t ship a hundred features. We shipped the five that actually matter — and we sweat them. Here’s what each one really does.

01 · The rules engine

Otto remembers so you don't.

Rules are the single feature that makes Biankbook different. You log a transaction; Otto notices it's a repeat; one tap teaches him the rule. From then on it lands in the right category and pocket on its own. Rules learn cadence — weekly, biweekly, monthly, irregular — and they pause cleanly when you stop a subscription.

14
rules in the demo
92
entries caught this month
<1s
to teach a new one
biankbook.app/rules
Otto's rules
14 rules running
92 entries caught this month
Match
Category
Cadence
Caught
On
Acme Payroll
Income
biweekly
8×
Spotify
Subscriptions
monthly
4×
Netflix
Subscriptions
monthly
4×
Whole Foods
Groceries
weekly
22×
Trader Joe's
Groceries
weekly
14×
Apt 4B Rent
Rent
monthly
5×
biankbook.app/accounts
All accounts
Net worth · $16,356
che
Everyday Checking
••4182
$4,218
sav
Rainy-Day Savings
••9921
$12,860
cre
Cardinal Credit
••0044 · limit $5,000
$842
cas
Cash on Hand
manual
$120
02 · Multi-account ledger

Checking, savings, credit, cash.

Biankbook tracks four kinds of money: checking, savings, credit, and cash on hand. Add as many of each as you want. We never connect to your bank — you enter the balance, we keep the running total, and transfers between your own accounts don’t get counted as spending or income.

4
account types
of each, on paid plans
0
credentials stored
03 · Budgets & the In/Out chart

Spending you can read in a glance.

Set a monthly target on any of twelve categories. The bar fills with the category's color; if you cross it, it turns coral. No alerts, no shame. Pair it with the In/Out bar chart — five months of income and spend, side by side — and you'll see the rhythm of your life in about three months.

12
categories
9
budgets in the demo
5mo
rolling history visible
biankbook.app/budgets
December budgets
9 pockets · $4,150 planned
Groceries$484 / $500
Rent$1850 / $1850
Transport$156 / $200
Dining$320 / $400
Subscriptions$247 / $300
biankbook.app/goals
Goals
3 goals · all on track
Emergency fund
+$800/mo · ready in 4 mo
$6,840
of $10,000
Japan, autumn 2026
+$250/mo · ready in 11 mo
$1,820
of $4,500
New camera lens
+$100/mo · ready in 9 mo
$320
of $1,200
04 · Goals & forecast

Save toward actual things.

Pick a name, a target, a deadline. Tell Otto how much you'll add each month. He does the on-track math: how many months it takes at current pace, whether you'll hit your deadline, what the gap is. The Forecast view projects six months forward across all your goals at once.

6mo
forecast horizon
1tap
to contribute
0
fees on transfers
05 · Chapters & levels

End-of-month becomes a moment.

On the last day of every month, you close the chapter together. The book is sealed; we summarize what you saved, where it went, and what Otto noticed. You level up if you logged consistently — ten named levels, each a kind of attention. Apprentice, Bookkeeper, Steward, Patient Reader.

10
levels to read for
30s
to close a month
1pdf
per chapter, kept
Lvl 1
Apprentice
Your first chapter.
Lvl 2
Note-taker
Two months tracked. The hand steadies.
Lvl 3
Bookkeeper
A quarter held. Otto smiles.
Lvl 4
Quiet Saver
Every month this year saved more than spent.
Lvl 5
Even Hand
Five clean closes in a row.
Lvl 6
Steward
Half a year. Half a year.