Digital life
A timer for a short gap?
A small gap is not a failed 25-minute session. Try a browser-only planner that separates focus, an optional break and meeting setup—then choose one finishable task.
Updated
PiPi's reading shelf · English
What’s the useful answer?
Read a short answer, check its examples and limits, then try the tool.
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Your saved articles →Questions, original titles and summaries on this page only. Your search is not sent or saved.
No matching read. Try a shorter search, or clear it.
Start with this question
Open the guide for evidence and limits, or try its tool.
Paycheck · United States
Why is your paycheck smaller than your salary?
Taxes, Social Security, Medicare and benefits reduce the deposit. Salary alone cannot predict a pay stub.
PiPi's annual model is not an employer pay-stub or deposit forecast. Check your actual wage bases and deductions.
Writing · Platforms
Can one character count tell you whether a post will fit?
No. X weights characters and links, SMS depends on encoding and segments, and Google does not set a fixed snippet length. A raw count is only the starting point.
Check the final result in the platform where you will publish.
Digital life · Unicode
Why does btoa() fail on emoji?
It expects one-byte characters. Convert Unicode text to UTF-8 bytes before Base64 encoding; decode those bytes as UTF-8 to get the original text back.
Base64 is an encoding, not encryption. Do not treat it as protection for a secret.
Language · Japanese
Is there an official list of JLPT N5 words to memorize?
The organizers do not publish an itemized vocabulary list. Our 12-card web sample lets you try readings, meanings, and phrases; it is not an exam syllabus.
The sample does not cover the full N5 test or carry progress into the app.
The starting guides have source and review records. These are AI-assisted checks, not a guarantee of accuracy or human specialist review.
Free printables
Animal coloring pages
Choose from 12 animal outlines in A4 or US Letter PDF, or PNG. See the AI-generated source photos alongside the outlines. No signup, app or photo upload needed.
Parent guide
How to ask for help in Korean at school
Try one short role-play together and open a free Korean–English printable. No app or sign-up is needed.
Free photo checklist
One photo. Three checks.
Compare the subject, background and edges. Save the free checklist. No app or signup needed.
Free sound comparison
Sound or silence?
Compare two sounds, or one with silence, using the same small task. Note what felt comfortable or distracting. No app needed.
More guides with review records
These published guides have documented sources and checks. Choose the topic you need today.
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Lunar Calendar
Lunar Birthday in Google Calendar: Check the ICS Before You Import
A 2028 leap-month mix-up can move a birthday by 30 days. See five dates tested in PiPi's converter, what its ICS and CSV actually contain, and the Google Calendar import-and-alert checks that matter.
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Take-Home Pay
Same Salary, Different Paycheck: Filing Status and State Tax (2026)
Compare two $80,000 pay scenarios with explicit 2026 tax assumptions—and see where a simplified net-pay model stops.
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Line Tools
Dedupe, Trim, and Sort Lines: What Changes the Result
Why do duplicates remain after sorting? Compare two fruit lists to see how adjacent dedupe, whole-list dedupe and blank-line removal differ.
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JSON Formatter
JSON Formatter: Check Numbers, Order and Duplicate Keys
Run three made-up JSON samples to check key order, exact number spellings and escaped duplicate keys before copying a result.
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JWT Decoder
How to Read a JWT's Claims and Expiry (Safely)
Use a sample JWT to read payload and exp, understand why decoding is not verification, and handle live access tokens as credentials.
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Markdown → HTML
Converting Markdown to HTML Without Getting Burned
What to watch when you turn Markdown into HTML: table support, the sanitized preview versus the raw source, and the line-break gotcha.
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URL Encode / Decode
URL Encoding: Query Values, Whole URLs, and +
Use component for one value, full for an already-structured URL. Reproduce why + becomes a space in query parsing and how to preserve a literal plus.
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Japanese & Korean Vocabulary
Japanese words: recognize them or recall them?
Try three English-to-Japanese verb prompts before revealing the references. Compare recall with a four-choice quiz, and plan a later check without a guaranteed review schedule.
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Percent Calculator
Which percentage do you need? Choose the base first
A discount, a goal above 100%, and a rate change can all be correct with different bases. Pick the denominator before using the percent calculator.
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BMI / BMR / TDEE
Smart Scales and DEXA: What the Measurements Can Tell You
A practical guide to weight, BMI, and body-fat estimates: what a home scale measures, what BIA infers, and why brand-wide accuracy percentages are not dependable.
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Age
Turning 30 or 40 in Korea: which age counts?
A birthday is not an eligibility decision. Compare two fictional dates with Korea’s youth-savings birth-date range and official cancer-screening year lookup.
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Interest & Mortgage
USD CD or FX? Check the USD you may get back
A $10,000 hypothetical CD example shows what the PiPi calculator can check—and why foreign-currency value, deposit insurance, and account location are separate questions.
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Interest & Mortgage
2026 401(k), IRA and HSA Limits: A Checked Planning Map
Corrected September 24, 2026: check 2026 401(k), IRA and HSA limits, remaining contribution room, and what a savings calculator cannot promise.
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Interest & Mortgage
529, Roth IRA, UTMA or Trump Account? A 2026 Parent’s Guide
Four U.S. child-saving routes serve different goals. Check the 2026 IRS rules, a transparent $200-a-month example, and what our calculator cannot do.
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Word Count
LinkedIn headline and About: a clarity check before you publish
Compare two fictional profile rewrites, count the text you control, and check the final headline and About in LinkedIn itself instead of trusting a fixed preview rule.
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Word Count
Resume Length in 2026: One Page, Two Pages, and the Federal Rule
Compare the same 437-word sample in one-page and two-page layouts, with a free PDF and source text. Keep private-sector advice separate from USAJOBS rules.
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Interest & Mortgage
Nominal vs Real Return: A Hypothetical 5% Savings Example
Corrected September 24, 2026: calculate a hypothetical after-tax, inflation-adjusted savings return without mistaking assumed rates for today's bank offers or a forecast.
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Lunar Calendar
24 Solar Terms in 2026: Eight Seasonal Landmarks
See eight 2026 seasonal landmarks, why Lichun can be cold, and how sun-defined terms fit a lunisolar calendar. Dates can differ by time zone.
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Interest & Mortgage
HYSA vs Treasury Bills After Tax: A $100K Worked Example
In a hypothetical one-year example, a 5% HYSA and a 4.5% Treasury bill differ by only $85 after tax in California—not 2.6 percentage points. Compare both on the same basis before choosing.
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Age
One card, not the full birthstone list
June has three birthstones. Learn what our single-card result leaves out, and how to check the full list.
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QR Generator
Shop QR codes: what changes mean you must replace them?
A new guest password needs a new Wi-Fi QR. A menu edit at the same URL may not. Compare Wi-Fi, menu and contact codes, then use a counter-card proof log before printing.
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Age
Social Security at 62, 67 or 70: What the Numbers Mean
Corrected September 24, 2026: SSA-based claiming ages, a transparent $2,400-a-month example, earnings limits, and what a birthday calculator cannot tell you.
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Word Count
Cover letter word count: edit a paragraph, keep the evidence
Compare a fictional paragraph before and after editing, then catch two shorter rewrites that change the facts. Use the free evidence ledger for your own draft.
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QR Generator
Wedding QR: can your guest actually RSVP?
A readable QR can still open the wrong RSVP form. Check the guest link, sign-in, venue entrance and paper fallback before printing.
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Interest & Mortgage
Simple vs Compound Interest: Same 4%, Different Totals
Compare fictional 4.10% APY and 4.05% nominal-rate labels over one year, check the $2.60 gap before fees, then explore the same-4% compounding table.