Find outliers in a list of numbers with IQR fences or z-scores - quartiles, fences, flagged values with index and side, and the mean without them

Confidence interval for a mean from mean, sd and n using Student t, or a proportion from successes and n using Wilson, at 50 to 99.9 percent

Recent New Zealand earthquakes from GeoNet - magnitude, depth, felt intensity (MMI), nearest locality, time and coordinates, filterable by intensity

Text diff - line-by-line differences between two texts with added, removed and unchanged counts and similarity

Word frequency analysis - top words and repeated bigrams without stopwords, unique and total words, lexical diversity and average word length

Convert an ISO 8601 duration like P1DT2H30M or PT90M to seconds, minutes, hours, days and plain words, or turn seconds into a duration string

Tezos account lookup via TzKT - XTZ balance, staked amount, baker delegation, reveal status, tokens held, transaction count and first and last activity

Top holders of an ERC-20 token with labels, balances and share of supply plus top 1, 5, 10 and 20 concentration and a concentration level from Blockscout

EVM address profile from Blockscout - name, ENS, contract and verified status, proxy type, tags such as exchanges, balance, token details and activity counts

Credit card payoff time from balance, APR and a fixed payment - months, total interest, total paid and what share of payments goes to interest

Solve implied volatility from an observed option price using Black-Scholes, with delta, vega, a volatility regime label and the pricing error

Bitcoin address validator - checks base58check and bech32/bech32m checksums, returns network, address type (P2PKH, P2SH, P2WPKH, taproot) and encoding

Minecraft Java server status - online flag, player count and sample, version, software, MOTD, plugin and mod counts and resolved IP and port

Kelly criterion bet sizing from win probability and odds - full, half and quarter Kelly, expected log growth, break-even win rate and a verdict

Current local time, date, weekday and DST status for any IANA timezone or lat/lon, e.g. what time is it in Lisbon right now

Inspect a string by code point - UTF-8 bytes, category, script, normalization changes, and warnings for zero-width, bidi and mixed-script lookalike text

Find overlapping working hours across 2 to 8 time zones for a date - UTC windows with local start and end in each zone and total overlap minutes

London Underground, DLR, Overground, Elizabeth line and tram status from TfL - good service or delays per line with disruption reasons right now

Philadelphia SEPTA Regional Rail real-time arrivals for a station - line, destination, status and track

Live departures from any Norwegian stop through Entur - line, mode, destination, platform, scheduled and expected time, delay minutes and cancellations