Data AI Apps

Open, edit, analyze, and build Excel workbooks with plain English - formulas, formatting, charts, and full report templates in a live spreadsheet grid. The file stays in your browser; only the cells being discussed are sent to the AI model.

Paste PostgreSQL — a schema, a migration, or a slow query — and get an expert review: severity-ranked findings each with a runnable fix, the missing indexes as complete CREATE INDEX statements, a corrected rewrite of your SQL, and an honest five-area health check. A free instant prescan flags the classic anti-patterns (varchar(n), naive timestamps, float money, int primary keys, OFFSET pagination, unindexed foreign keys, unwrapped auth.uid()) in your browser before you run anything. Derived from @affaan-m/postgres-patterns.

Paste your employee roster and get the people report leadership asks for - headcount shape, trailing-12-month attrition with the arithmetic shown, spans of control, tenure mix, risks and sequenced recommendations, built only from your own data. A free in-browser org-stats scan tallies headcount, departures, spans and data errors as you type. No benchmarks are ever invented and no demographics are ever inferred.

Paste a CSV or describe your data and what it should communicate. A free in-browser profiler types your columns, picks a heuristic chart and sketches it instantly; the AI then recommends the right chart form with exact encodings, the alternatives and why they lose, misleading-chart pitfalls, accessibility guidance, and runnable code for matplotlib, plotly, Vega-Lite, Recharts, D3 or ECharts. Critique mode reviews a chart you already built. Derived from @shubhamsaboo/visualization-expert.

Web performance, arithmetic first. Drop a Lighthouse JSON report, a PageSpeed Insights response, a HAR capture, a DevTools resource table or just your metric readings, and your browser does the whole measurable half for free: every Core Web Vital banded against the published thresholds, page weight by resource type in wire and decoded bytes, a performance budget derived line by line where your own target replaces the preset instead of stacking on it, a savings ledger in which each resource is claimed by exactly one rule so the totals cannot double count, repeat-visit cache savings kept in their own ledger for the same reason, twenty-three findings each reading only the fields it is about, and a generated Lighthouse budgets.json, priority snippet, three CSVs and a full report. The AI pass adds the judgement: which finding is actually holding the largest paint back, the fix written for your stack, the work ranked by impact against effort, and a verdict on every finding including the false positives. A derived work of the web-performance-optimization skill by @sickn33. Analysis of a capture you supply, not a measurement of your page.

Paste your compensation bands and employee roster and get a structured comp review built only from your own numbers: band placement with compa-ratios, outliers below min or above max, compressed adjacent bands, pay inversions, retention risks, and costed recommendations for the next cycle. The band-math scan runs free in your browser; market benchmarks are never invented. Derived from @anthropics/compensation-benchmarking.

Paste per-SKU demand history plus your scenario - lead times, MOQs, promotions, service targets, new items - and get the plan a senior demand planner would produce: an honest pattern read of each series, a forecast method that fits it, safety stock and reorder points with every assumption stated, order quantities that respect MOQs, plus risks, actions and open questions. The plan must show its safety-stock and reorder-point arithmetic, and your browser re-runs every formula it states and flags any that does not match the number printed beside it. The series scanner and safety-stock calculator run free in your browser. Derived from @affaan-m/inventory-demand-planning.

Paste a data analysis you are about to share - prose, tables, SQL and its results, method notes - and get a structured audit: methodology review, a scan against seven named pitfalls each marked CLEAR/SUSPECT/FOUND with evidence, PASS/FAIL calculation spot-checks, the caveats that must travel with the numbers, and a verdict of Ready to share, Share with noted caveats or Needs revision. Revise and re-audit: the second pass is diffed against the first, showing what resolved, what is still open and what is new. The number scan and the revision checklist run free in your browser. Derived from @anthropics/data-validation.

Paste a company's financials - 10-K excerpts, a data screen, your notes - and build a three-scenario discounted-cash-flow model. The AI extracts and defends the assumptions; a deterministic in-browser engine computes the projections, CAPM WACC, terminal value, equity bridge, reverse DCF and base-centered sensitivity grids. Edit any assumption and recompute instantly, free. Derived from @anthropics/dcf-model. A modelling aid - not investment advice and not a professional valuation.

Paste a CSV or TSV export and get a data profile with judgement: the grain and whether the key actually holds, quality issues ranked by severity with the offending values quoted, the dimensions and metrics worth using, patterns to check, and 3-5 specific analyses to run first. The mechanical profiler runs free in your browser.

Paste a table - CSV, TSV, a spreadsheet copy - and get a working dashboard: KPI cards, SVG charts, category filters and a sortable drill-down table. The AI maps your columns, picks the charts and writes insights grounded in your rows; a deterministic in-browser engine computes every number. Auto-build and SPEC editing are free with no sign-in. Derived from @anthropics/interactive-dashboard-builder.

Stress-test decisions across 1,000 plausible futures.

Compare two JSON documents structurally - keys added, removed, changed - rather than as text, so reformatting and key reordering do not drown the real differences. Includes swap, clear and five worked examples. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (json-diff.html, Apache-2.0).

Enter percentages, tick the ones to exclude, and see the rest renormalised to sum to 100 - with the active total shown as you go. For the everyday case of reporting a split among respondents who actually picked a side, without leaving a chart whose bars add to 91%. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (percentage-recalculator.html, Apache-2.0).

Paste a Pipfile.lock and get its pinned dependencies back as Pipfile entries and as requirements.txt lines, each with a copy button. Reads both default and develop sections, and skips entries with no pinned version rather than emitting broken pins. Handy for getting a requirements.txt out of a Pipenv project without installing Pipenv. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (pipfile.html, Apache-2.0).

Paste XML and get parse errors pinned to line numbers, highlighted in a numbered listing of your source. Checks well-formedness - unclosed tags, bad nesting, stray ampersands - not schema conformance. Uses the browser's own DOMParser, so the verdict matches your browser's. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (xml-validator.html, Apache-2.0).

Choose a local folder and explore it in the browser: file tree, file and folder counts, total size, filter by type, a type-distribution chart, and click-to-preview for individual files. Built on <input webkitdirectory>; the browser hands over only what you select and nothing leaves the page. Imported Claude artifact. Source: https://github.com/simonw/tools (webkitdirectory.html, Apache-2.0).

Paste anything and see every MIME flavour the clipboard is really carrying - text/plain, text/html, text/rtf, image/png, vendor-specific types - with the raw payload behind each. Useful when a paste mysteriously loses formatting, or when writing paste-handling code. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (clipboard-viewer.html, Apache-2.0).

Pretty-print JSON that a normal formatter rejects - truncated mid-string, missing closing braces, or still streaming - with live updates as you type, a validity indicator and input/output character counts. Handy for half-arrived payloads and streamed structured output. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (incomplete-json-printer.html, Apache-2.0).

Paste a Swagger/OpenAPI JSON, tick the endpoints you want, and generate a trimmed spec containing just those paths plus the $ref definitions they depend on. Useful for cutting an oversized API spec down to something readable - or small enough to hand to a model. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (swagger-subset.html, Apache-2.0).

Build a JSON Schema visually: add typed properties and nested objects, give the schema a title and description, and copy the generated JSON. Handy for tool/function-calling definitions and structured-output contracts. State lives in the URL so the link restores your work. Runs fully client-side. Imported Claude artifact. Source: https://github.com/simonw/tools (json-schema-builder.html, Apache-2.0).