TinyUseful No. 1 — April 2026

A pocket knife
for your browser.

Ten small tools on a single page. They calculate numbers and explain words. That's it. No account, no saved input, no AI guessing. For when you don't need AI — just the answer.

No account No saved input No AI No tracking Works offline after first load
§ 01

Numbers

Math you actually do — six tools, deterministic, computed in your browser.
No. 01

Percentage

% of, X is what % of Y, and % change between two numbers.

Result12
No. 02

Sales Tax / VAT

Add tax to a net price, or remove tax to find the original net.

After tax$108.88Tax amount $8.88
No. 03

Mortgage

Monthly principal & interest using the standard amortization formula.

Monthly payment$2,919Total interest $600,765 · Total paid $1,050,765
No. 04

Loan

Auto, student or personal — fixed-rate, fully amortized.

Monthly$501Total interest $5,059 · Total paid $30,059
No. 05

Compound Interest

Future value of a starting balance plus monthly contributions.

Future value$300,123Contributed $130,000 · Interest earned $170,123
No. 06

Rent Affordability

The 30%-rule, adjusted for monthly debt obligations.

Suggested max rent$1,500Conservative $1,300 · Stretch $1,815 · Based on the 30% rule
728 × 90 leaderboard placement
§ 02

Words

Understand the language you're using — four tools, no dictionary lookup needed.
No. 07

Type of Word

Identify the part of speech with example sentences.

Part of speech run
verb noun

verb She runs every morning before work.

noun They went for a long run in the park.

No. 08

Syllable Counter

Counts syllables per line — useful for haiku, songwriting, ESL practice.

Result
No. 09

Word Counter

Live word count with sentences and reading time.

Stats 0 words 0 sentences · 0 min read
No. 10

Character Counter

Live character count with platform limits — Twitter, LinkedIn, SMS.

Characters 0 0 with spaces · 0 without · Twitter 280 · SMS 160 · Meta description 160

How it works

Every number tool uses the same formula your bank uses, computed entirely in your browser using JavaScript. Word tools use a built-in dictionary and standard syllable rules — no external lookup, no API call. Open the page once, and it works offline forever.

Why no AI

AI is great at writing emails. It is a wasteful, unverifiable tool for arithmetic and grammar. These ten tools have one correct answer each. No probability, no hallucination, no "let me try that again." For when you don't need a chat — just an answer.

What we sell

One advertisement, declared. No tracking pixels, no fingerprinting, no email gates, no popups. We sell attention to advertisers in one clearly labelled box. That is the entire business model. Your inputs never leave your browser.