Data Processing

Validate CSV structure, detect malformed rows, unbalanced quotes and column mismatches

Format Conversion

Encode, decode, and brute-force the Caesar cipher with any shift (1–25), or print all 25 candidate decodings.

Text Processing

Capitalize only the first letter of each sentence while preserving all other letters exactly as typed. Fixes sentence starts without disturbing acronyms, proper nouns, or intentional mixed-case.

Data Visualization

See the Central Limit Theorem in action: draw samples from a non-normal source distribution (uniform, exponential, Poisson, or Bernoulli), plot the histogram of sample means, and overlay the predicted Normal curve N(μ, σ²/n). Compare empirical vs theoretical mean and standard error, and watch convergence tighten as the sample size grows.

AI Tools

Score candidate RAG chunk-splitting schemes for a document across four metrics — coherence (clean sentence/paragraph boundaries), coverage (topic focus / key-term concentration), context overlap health, and chunk-size consistency — then compare up to three schemes side by side and recommend the best. Pure offline heuristics, no model calls.

Science & Education

Translate a DNA or mRNA sequence into protein using the standard genetic code. Scans all 6 reading frames (forward and reverse complement), marks start (AUG) and stop codons, identifies the longest open reading frames (ORFs), and shows the amino-acid composition with color-coded residue types. Supports T→U normalisation and reverse-complement translation.

Design

Solve a CSS filter chain that closely reproduces a target hex color from a monochrome base color

AI Tools

Generate controlled A/B variants of a prompt across the persona, tone/style, output format, and constraints dimensions, then compare them side by side with a heuristic rubric score and a word-level diff against the baseline. A reproducible way to test how a prompt behaves under different framings before picking one for production.

Text Processing

Convert text to bold, italic, or bold-italic using the Mathematical Alphanumeric Symbols Unicode block. Plain Unicode text — no font needed.

Text Processing

Wrap text in enclosed/bubble Unicode glyphs — ⓐⓑⓒ — in four variants: outline, filled (❶), parens (⒜), negative (🅐).

Development

Plan and visualise an API latency budget. Enter a P99 target (e.g. ≤ 300ms) and per-stage allocations (DNS, TCP, TLS, TTFB, Processing, Network) to see a live waterfall, budget utilisation, and over-budget warnings. Optionally paste an OpenTelemetry or Datadog trace to reverse-engineer a measured allocation.

Health

Plot the classic 23-day physical, 28-day emotional, and 33-day intellectual biorhythm sine curves around any target date. See today's cycle states, mark zero-crossing "critical days", and read a daily value table with a combined total — enter your date of birth and a target date.