About UNSEEN OFFERS
What we do
We build small, focused tools that work instantly in your browser — calculators, converters, generators and developer utilities. If you are checking a sale price, comparing unit costs or working through a coupon or savings calculation, our shopping tools help you run the numbers you enter. Practical guides sit alongside the tools.
Tools are grouped into categories such as Shopping, Finance, Date & Time, Math, Converters, Text, Generators and Developer, so you can browse by the task or topic you have in mind. No accounts, no paywalls, no clutter.
Most tools run entirely on your device. Nothing you type is sent to a server unless the tool clearly needs to. Shopping calculations are based on your inputs and do not verify a retailer’s current prices, stock or offer terms. Prices, discounts and availability can change, so check retailer details before buying. We aim to make results clear and useful, but they depend on your inputs and are not a guarantee or professional advice.
Our principles
Fast: tools load and respond immediately.
Simple: clear inputs and clear results, nothing else.
Private: your data stays in your browser by default.
Free: every tool is free to use, with no signup.
Where the numbers come from
Unit conversions use exact international definitions, such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg. Time zone tools use the IANA time zone database built into your browser, so daylight saving time is applied for the date you choose.
The 2026 income tax and bonus calculators use the IRS tax year 2026 brackets and standard deductions, the Social Security wage base announced by the Social Security Administration, and the 2026 California tax rate schedules published by the Franchise Tax Board. Each tax page lists the figures it uses.
How the tools are built
Each tool page explains the formula behind the result and shows worked examples, so you can check the answer by hand. Reference tables on the pages are generated with the same code the tool uses, which keeps the page and the calculator in agreement.
Random numbers, passwords and IDs are created with your browser’s cryptographically secure random generator. Nothing you type into a tool is needed by us, so it stays on your device.