Tools built for
researchers, by a researcher.

Upload your CV once — a semantic embedding model running entirely in your browser ranks every current academic and research opening by how well it matches your background. Not keyword matching. Not a generic relevance score. A genuine vector similarity between your experience and each job description, with a percentage score, highlighted pros, and flagged gaps on every listing.

Sources include the AAS Job Register (the primary listing board for physics and astronomy faculty and postdoc positions), Jobs.ac.uk (UK and European academia), EURAXESS (EU-funded research positions), and The Muse (research-adjacent industry roles). Filter by position level — MS, PhD, JRF, SRF, Postdoc, Scientist, Faculty, Data Science, Engineering — by country, field, and application deadline window.

When you find strong matches, export them directly to EuKosmos JSON for one-click import into your EuKosmos Job Register. Your CV is processed locally and is never uploaded, stored, or transmitted to any server.

Paste a source name, RA/Dec, or known identifier. AstroDeepSearch resolves the position and fans out concurrent queries to SIMBAD, VizieR, CDS image services, LoTSS DR2/DR3, eROSITA-DE DR1, DESI DR1, arXiv, CrossRef, InspireHEP, and optionally NASA ADS — then assembles a publication-grade dossier with every fact hyperlinked to its source archive, catalogue row, or paper.

This replaces the manual workflow of opening 8 browser tabs, copying coordinates, waiting for each archive separately, and assembling the results yourself. The dossier is formatted for direct citation: every cross-match includes the catalogue identifier, coordinate offset, and a direct link to the source row. Bring your own ADS API key for full literature tier access including refereed-only filtering, advanced query syntax, and citation networks.

Convert between angular and linear size at any redshift under an arbitrary ΛCDM cosmological model. Enter an angular size and redshift, get the physical scale in kpc or Mpc; enter a linear size, get the angular size on the sky. Computes the full distance ladder: angular diameter distance D_A, luminosity distance D_L, comoving distance D_C, light-travel distance D_LT, and lookback time — all at once.

Switch between Planck 2018, WMAP9, or a fully custom ΛCDM model via H₀, Ωm, and ΩΛ. All calculations run in your browser using numerical integration — no external libraries, no server calls. Validated against published values.

Convert astronomical coordinates between every system astronomers actually use: ICRS, J2000/FK5, B1950/FK4, Galactic, Ecliptic, and Supergalactic — in decimal or sexagesimal format, for a single source or a whole observing sample at once. Validated against published positions for Sgr A*, M31, Crab Nebula, and M87.

Batch mode accepts a pasted table or uploaded file — useful for converting a full proposal sample before an ALMA or VLA submission deadline. Output is formatted for direct paste into proposal tools or observation preparation software.

Plan astronomical observations from any major observatory worldwide. Enter a target name or coordinates and a date, and ObsPlan generates visibility curves, airmass plots, twilight start/end times, and Moon angular separation and illumination — all in one plot, for any night, from 41 of the world's major optical, infrared, and radio observatories.

Batch mode accepts your full proposal target list and generates observability reports for all sources simultaneously — useful when preparing ALMA, JCMT, or any optical telescope proposal requiring target visibility justification. Presets include ALMA, VLT, Subaru, CFHT, Keck, Gemini, and 35+ others. Validated against Meeus (1998).

Drop a CSV or TSV, choose a chart type and palette, and export at any journal's exact column width and DPI — without touching matplotlib. Journal presets cover Nature (89 mm and 183 mm column widths), Science, IEEE, MNRAS, ApJ, and PNAS, for both single-column and double-column figures, plus slide formats (16:9 and 4:3).

Colour-blind safe palettes are built in. Export to SVG (pure vector, ideal for LaTeX), PDF, or PNG at 96, 150, 300, or 600 DPI. PlotLab also generates reproducible code in matplotlib, seaborn, and ggplot2 — so the figure you preview in the browser is the exact figure your collaborators can reproduce from the code snippet.

Paste a CSV or TSV and get a publication-grade LaTeX table — with booktabs rules (\toprule, \midrule, \bottomrule) by default, siunitx S columns for correct alignment of numeric data, threeparttable for table notes, and sidewaystable for landscape layout. One click opens the generated table directly in a new Overleaf project.

Auto-detects column types (numeric vs text) and applies the appropriate column specifier. Supports table* for two-column spanning, \resizebox for width-constrained tables, and custom placement specifiers. Also exports to Markdown, HTML, and reformatted CSV.

Paste your text and get live word counts, character counts, reading and speaking time estimates, vocabulary diversity (type-token ratio), and six independent readability scores: Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Automated Readability Index, and Coleman-Liau — with a consensus grade average across all six.

Particularly useful for checking grant abstracts (word limit compliance, readability for non-specialist review panels), cover letters, and journal abstracts against character limits for platforms including Nature, Science, arXiv, Twitter/X, and LinkedIn. Word frequency analysis identifies overused terms. Everything runs live as you type.

Drop two files — or paste two text snippets — and see exactly what changed between them at line, word, or character granularity. Handles plain text, LaTeX manuscripts, BibTeX files, JSON, CSV, and PDF (text extraction). Side-by-side and inline views. Shows addition/deletion statistics and a similarity percentage.

The LaTeX and BibTeX modes are the differentiators: they understand the file structure and produce cleaner diffs than generic text comparison tools. Particularly useful for tracking manuscript revisions between collaborator rounds, comparing BibTeX libraries, and auditing JSON configuration changes.

Sixteen professional PDF tools that run entirely in your browser. Your files never leave your machine — everything is processed client-side using pdf-lib and PDF.js. Covers the full range of PDF operations researchers need: combining multiple papers into a single document, extracting specific pages, rotating pages, compressing for email, signing, adding watermarks, and password-protecting sensitive documents.

Organised into four tool groups: Organise (Merge, Split, Rotate, Reorder, Delete, Extract), Convert (to/from Image, PDF/A), Optimise (Compress), and Secure (Watermark, Password protect, Sign). No upload, no account, no size limits imposed by a server.

Sixteen image tools built for researchers, running entirely in your browser. The research-specific tools cover the tasks that come up repeatedly in academic life: passport photos with country-specific size presets (US, UK, India, Schengen, China and more), signature extraction from a photographed paper page, AI-powered background removal using an ONNX model that runs locally, and publication figure preparation with journal-specification DPI and dimension metadata.

General image tools cover crop, resize, rotate, flip, convert between formats (PNG, JPEG, WebP, AVIF), compress, grayscale, and basic colour adjustment. The AI background removal model downloads once and is cached permanently — subsequent removals are instant and fully private.

Sign PDF documents in your browser — no account, no watermark, and no file size limits. Your PDF is opened, signed, and downloaded without ever being uploaded to any server. Draw your signature, type it, or upload a signature image, then place it precisely on any page of your document.

Also supports filling form fields, adding text annotations, initials, dates, and checkmarks to any PDF. Built for the recurring researcher need: signing contracts, agreements, HR forms, visa documents, and institutional paperwork without subscribing to Adobe Acrobat or DocuSign.

A scientific calculator that understands expressions the way you write them, with full unit awareness, complex number support, matrix operations, and an inline plotter. Type expressions like 5km + 3mi, (2+3i)^2, [1,2;3,4] * [5;6], derivative('x^3','x'), or define functions and variables for reuse across calculations.

Standard, programmer (hex/binary/octal), and plot modes. Adjustable precision from 4 to 14 significant digits. Trigonometry in radians or degrees. Built on mathjs — runs entirely in the browser, no server.

A developer's utility belt in one tab. Format, minify, validate, and sort-by-key any JSON document, with tree view and YAML / JS literal output options. The structural diff compares two JSON documents semantically — not as plain text — highlighting added, removed, and changed keys and values in their correct position in the hierarchy.

Also includes: UTF-8 safe Base64 encode/decode, a URL encoder and parser (breaks a URL into scheme, host, path, and all query parameters), and a live regex tester with match highlighting, group extraction, and flag controls. Everything in your browser — no upload, no tracking.