usefulweb.site: 432 focused tools that just work

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  Twinworks

  Factory digital twin & production simulation

  Model a production line, simulate it and find the bottleneck — free, in your browser.

  • Draw a factory, press play, watch parts flow and the bottleneck light up
  • Real statistics: warm-up, replications and confidence intervals
  • OEE, Little’s law, state Gantt and cost per good part out of the box
  • What-if scenarios, buffer sweeps and a buffer allocation optimiser
  • Runs locally, saves to your browser — no account, no upload

  Launch Twinworks Learn more: Twinworks

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  RavingDesk

  Paper trading & data workspace

  Practise trading on paper and chart your data: orders, risk, datasets, analyses, reports.

  • Paper orders, fills and positions with sources
  • Risk sizing, exposure and crypto cost planners
  • Import CSV or Excel, chart it and run real analyses on it
  • Public data, snapshots and one report with findings
  • Local-first: no broker, no real orders, no account

  Launch RavingDesk Learn more: RavingDesk

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  Lumina

  Photo editor & image toolkit

  Bring out what you saw. A free photo studio, right in your browser.

  • Edit photos on your device, with no upload
  • Reversible adjustments, color mixer, looks, on-photo crop and styled text
  • JPEG, PNG and WebP exports, plus editable projects
  • Twenty-eight related tools available through API and MCP

  Launch Lumina Learn more: Lumina

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  Soundscape Atlas

  Sound map & ambience studio

  Find real field recordings on a world map and mix them into calm, editable soundscapes.

  • Offline world map with real, licensed field recordings
  • Mix recordings with generated rain, wind, water, fire and drones
  • Automation curves, room reverb and a sleep timer
  • Eleven imaginary worlds and real-recording soundwalks
  • WAV export with a credits file; never plays on its own

  Launch Soundscape Atlas Learn more: Soundscape Atlas

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  Chainscope

  Web3 investigation desk

  Investigate transactions, bridges, contracts, DAOs and wallets in one case file.

  • Fifteen web3 tools behind one investigation case file
  • Findings dashboard, merged entity graph and timeline
  • Results suggest the next check: block → MEV, proxy → implementation
  • Run history, A/B comparisons and batch runs over many hashes
  • Printable report, CSV/JSON/Markdown exports and .ics reminders

  Launch Chainscope Learn more: Chainscope

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  Flipline

  Drawing, storyboards & animation

  A few drawings. A little life. Make a flipbook in your browser.

  • Local drawing and frame-by-frame animation
  • Onion skins, layers, transform handles and automatic inbetweens
  • GIF, video, PNG sequence, sprite sheet and storyboard exports
  • Drawing brushes, pixel art, retro effects, comics, storyboards and twenty-three tools for people and AI agents

  Launch Flipline Learn more: Flipline

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  Ledgerly

  Household finance & life-admin desk

  Budgets, bills, subscriptions, loans, contracts and deadlines on one private desk.

  • One check-up runs 25 money and life-admin tools over your own household data
  • Bank CSV import, budget vs. actual and a recurring-payment finder
  • Contract notice dates, decoded letters and renewals in one calendar with .ics export
  • Loan plan B, decision toolbox with A/B comparison and a printable household report
  • Reality Check: rent vs buy, income and wealth percentile, relative scale and early-retirement bridge
  • Stays in your browser: no account, no bank login, nothing uploaded except tool inputs

  Launch Ledgerly Learn more: Ledgerly

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  Ohmforge

  Virtual electronics workbench

  Draw a circuit, switch it on, and measure it with real-feeling bench instruments.

  • Schematic editor + SPICE-style simulator in the browser
  • Oscilloscope, multimeter, Bode plotter, generator, bench supply and parameter sweep
  • Animated current flow and burnt-out parts when you overload them
  • SPICE netlist import/export with .param and .subckt, SVG/PNG/CSV/BOM exports
  • Free, no login, projects stay on your device

  Launch Ohmforge Learn more: Ohmforge

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  Hearth

  Home & travel planner

  Plan meals, chores, home care, moves, trips and good days for your household in one place.

  • One household project drives 22 planning tools
  • Fridge check → recipe ideas → dinner plan → shopping list
  • Fair chores that remember who did what
  • Jet lag, connections and travel money in one trip plan
  • Drying days, outdoor-job windows, bridge days and quiet weeks
  • Runs in your browser — autosave, files, share links, no account

  Launch Hearth Learn more: Hearth

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  Kerfwise

  Cabinet & furniture CAD

  Design cabinets and furniture, get cut lists, optimised sheet layouts, costs and drawings.

  • 16 parametric cabinet & furniture types incl. diagonal, L-shaped and angled corners
  • Kitchen and room planner: snapping runs, rooms, areas and IFC4 export
  • Cut list + polygon-aware sheet nesting with lower bound
  • CNC G-code (GRBL, LinuxCNC, Fanuc) with drilling and toolpath preview
  • Costs, hardware, drawings, DXF/SVG/CSV export
  • Runs in the browser, saves locally, free

  Launch Kerfwise Learn more: Kerfwise

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  ObscurIQ

  OSINT case desk

  Organize public-source research: cases, a research log, pivots and indicators.

  • Separate cases with a timestamped, reviewable research log
  • Search, archive, ICANN and blockchain-explorer pivots — only on your click
  • Signalhouse and Chainscope checks inline, with two-way hand-overs
  • Indicator extraction, defanging and a local file inspector
  • Timeline, printable case report and portable workspace files

  Launch ObscurIQ Learn more: ObscurIQ

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  Proofline

  Math notebook

  Solve, graph, test and visualise in one notebook — with data, findings and a report.

  • Twenty-four real calculators as notebook cells — symbolic, numeric, statistical, optical, chemical, structural and algorithmic
  • Curve fits, ODEs, FFT spectra, balanced reactions and pH computed locally with verified engines
  • One dataset flows into many analyses, with out-of-date tracking
  • Batch runs, A/B variants and run history for every cell
  • Autosaves locally — no account, share by link or file

  Launch Proofline Learn more: Proofline

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  Opsdeck

  Developer & ops workbench

  One deck for CI failures, cron, traces, k8s events, API diffs, query plans and Terraform.

  • Eighteen developer and ops tools behind one paste box
  • Ranked findings with triage, fixes and actions
  • Release gate with go/no-go rules over every result
  • Scenario A/B and comparisons over time
  • Business-day due dates, reminders and a fair review meeting
  • Secrets masked in the browser before anything is sent

  Launch Opsdeck Learn more: Opsdeck

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  Renderloom

  3D scene & material studio

  Shape a scene. Find its light. Keep every idea editable.

  • A dedicated 3D scene workspace with precise solids and saved cameras
  • Local rendering with six passes and four-light comparisons
  • Texture Lab exports reusable material maps and recipes
  • Figure Lab inserts stylized parametric scale figures
  • Editable scenes, local autosave, PNG/SVG and OBJ/STL exports

  Launch Renderloom Learn more: Renderloom

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  Reelcraft

  Audio, video & image batch studio

  Audio, video & image batch studio: cut, convert, compress, subtitle, reframe

  • Chain cut, reframe, compress, normalise, tag, subtitle and image tools into recipes
  • Batch runs over many files with a rate-limit-aware queue and retries
  • Delivery checks for Reels, podcasts, e-mail and web images
  • A/B variants, loudness board, privacy sweep and a printable report
  • Files stay on your device; results are kept locally after each run

  Launch Reelcraft Learn more: Reelcraft

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  Paperwell

  Document studio: PDFs, OCR, redaction, forms & contract reading

  Your paperwork in one dossier: PDF tools, OCR, redaction, forms and contract reading.

  • Seventeen document tools in one dossier, with every result kept and linked
  • Contract clauses, privacy practices and law changes in plain language
  • Last day to cancel, as a calendar file with reminders
  • Redaction suggestions and before/after verification
  • Batch recipes that queue, wait for rate limits and retry by themselves

  Launch Paperwell Learn more: Paperwell

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  Threadsmith

  Embroidery digitizing studio

  Draw or import artwork, turn it into stitches, export DST, PES, JEF or EXP files.

  • Running, satin, tatami, contour and motif stitches with real underlay
  • Built-in embroidery lettering (also on an arc), SVG import and bitmap auto-trace
  • Thread-look preview, stitch-out simulator and density heat map
  • Exports Tajima DST, Brother PES, Janome JEF and Melco EXP — every file re-read and verified
  • Free, local-first: autosaves in your browser, no account

  Launch Threadsmith Learn more: Threadsmith

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  Pageboard

  Website inspiration boards

  Collect website references, sort them with tags and arrange them on a moodboard.

  • Your own screenshots and links, organized by section, platform and tags
  • Spatial moodboard with keyboard control and PNG export
  • Editable JSON, standalone HTML and filtered exports
  • Accessibility review with automated and manual checks

  Launch Pageboard Learn more: Pageboard

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  Agentlab

  AI-agent & LLM workbench

  Test an AI agent before release: permissions, traces, costs, citations and output checks.

  • Release gates that pass or fail an AI agent before it ships
  • MCP permissions, tool poisoning and tool-definition drift in one review
  • Batch-validate structured outputs and routing test sets
  • Cost sweeps and scenario A/B on dated OpenRouter prices
  • Twelve usefulweb.site AI tools behind one workbench

  Launch Agentlab Learn more: Agentlab

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  Signalhouse

  Website & internet infrastructure inspector

  Inspect DNS, TLS, mail, CDN and routing of all your domains — and see what changed.

  • One run over your whole domain portfolio: DNS, TLS, mail, HTTP, CDN, IPv6 and routing
  • Scorecard, merged findings with triage and a deduplicated fix plan
  • See what changed since the last run or a pinned baseline
  • Renewal calendar for certificates and domains as an .ics file with reminders
  • Network lab: subnet planner, routing tables and hop-by-hop packet walks
  • Runs in your browser; checks use usefulweb’s public, passive tools

  Launch Signalhouse Learn more: Signalhouse

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  Keysmith

  Crypto & secrets lab

  Audit certificates, keys, TLS and passwords in one lab; secrets stay on your device.

  • Certificates, keys, TLS, checksums and passwords audited in one dashboard
  • Hashes, HMAC, PBKDF2, file encryption and Shamir run in your browser
  • Expiry timeline with .ics reminders and key ↔ certificate pairing
  • TLS scenario A/B, run history and batch decoding
  • Fourteen usefulweb.site security tools behind one workbench

  Launch Keysmith Learn more: Keysmith

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  Fieldday

  Sports club & training organiser

  Fixtures, brackets, ratings and training plans for your club — in one workspace.

  • One roster feeds mixer nights, brackets, a league, ratings and training
  • Every scored match updates Elo and Glicko-2 ratings automatically
  • League title odds with what-if scenarios compared side by side
  • Road-trip fatigue, jet-lag plans and an .ics club calendar
  • Runs in your browser — no account, autosave, share links

  Launch Fieldday Learn more: Fieldday

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  Provenance

  Software supply-chain security desk

  SBOMs, CVEs, containers and licences in one risk register — free, in your browser.

  • Twelve security tools on one project: SBOM, CVE, container, licence, provenance, trust
  • One findings register with CISA KEV / EPSS priority, triage and due dates
  • Release gate, fix plan, baselines over time and A/B comparisons
  • Printable report, CSV/JSON/Markdown exports and calendar reminders
  • Projects stay in your browser — no account needed

  Launch Provenance Learn more: Provenance

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  Kinetica

  Robot motion studio

  Simulate robot arms in your browser: kinematics, trajectories, collisions, program export.

  • Jog a 6-axis arm and drag its TCP with live inverse kinematics
  • PTP, LIN and CIRC moves with S-curve profiles and blending
  • Collision-free path planning around obstacles, timed within joint limits
  • URDF, CSV, G-code and KRL/RAPID-style program export

  Launch Kinetica Learn more: Kinetica

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  Tonegrid

  Tone matrix & beat sequencer

  Light up squares to build melodies, beats and acid bass, then arrange them into songs.

  • Melody matrix, drum grid and an acid bass line with accent and slide
  • Drum Lab, fretboard with chord shapes, ear and pitch trainer
  • Patterns A–H chained into a song arrangement
  • WAV and MIDI in your browser; MP3 and loudness via site tools
  • Keyboard-playable grid, never plays sound on its own

  Launch Tonegrid Learn more: Tonegrid

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  Bundlekeep

  Local project backup

  Back up projects from every usefulweb app into one file, check it and restore any part.

  • Scans saved projects in all 25 other apps, read-only and only when you ask
  • Recognises 55 project formats and says what a file leaves out
  • SHA-256 checksum for every file, verified whenever you open the backup
  • Restore one file, a selection or a ZIP — app storage is never overwritten
  • Everything stays on your device; API and MCP tools for agents

  Launch Bundlekeep Learn more: Bundlekeep

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  Panelcraft

  Comic books & figure references

  Shape a page. Arrange a book. Give your story a voice.

  • Multi-page books, panels, dialogue and screentones
  • Posed mannequin references and reusable page recipes
  • Local autosave, editable files and clean art exports
  • Four shared deterministic tools with API and MCP

  Launch Panelcraft Learn more: Panelcraft

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  Skyfold

  Sky & space atlas

  See the sky of any place and moment, plan eclipses and satellite passes, print star maps.

  • Real sky for any place and moment, 1800–2150
  • Print-ready star-map posters as PDF, SVG or PNG
  • Eclipses 2020–2040 with your local contact times
  • ISS and satellite passes from SGP4
  • Sun, shadow and a live day-and-night map

  Launch Skyfold Learn more: Skyfold

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  Printshop

  Printables studio

  QR codes, calendars, labels, graph paper and posters — print-perfect PDFs in seconds.

  • QR codes, Wi-Fi cards and EAN/UPC/Code 128 barcodes
  • Calendars in 17 languages with week numbers and holidays
  • Label sheets filled from CSV, with codes per label
  • Graph, dot, isometric, hex and music paper; posters and booklets
  • True-size vector PDF, SVG and PNG made in your browser

  Launch Printshop Learn more: Printshop

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  Focus Room

  Ambience player & focus timer

  A calm room for your screen: ambience playlists, gentle effects, slow visuals and a timer.

  • Ambience playlists with equal-power crossfades
  • Master EQ, room reverb, stereo width and limiter
  • Nine seamless generative backgrounds and kiosk mode
  • Art backgrounds, moving loops and a prop composer
  • Pomodoro, 52/17 and custom timers with gentle chimes
  • Session log with a weekly heatmap; never plays on its own

  Launch Focus Room Learn more: Focus Room

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  Cartograph

  Map posters & route art

  Turn a place into a map print, a GPS-art route, a fair meeting point or a true-size map.

  • City map posters from your own OpenStreetMap extract
  • GPS-art routes snapped to real streets, as GPX
  • Fairest meeting point for up to twelve people
  • True size of countries on a Mercator map
  • Runs in your browser — no map or routing servers

  Launch Cartograph Learn more: Cartograph

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  Playcards

  Card games table

  22 card games from Skat and Jass to Scopa and Daifugō, vs the computer, at home or online.

  • Mau-Mau, Schlafmütze, Blackjack, Skat and Doppelkopf
  • Computer players in three levels that never peek
  • Hot-seat on one device or online tables with a 6-character code
  • Skat by the ISkO, Doppelkopf by the DDV rules
  • Keyboard and screen-reader play, French or German cards

  Launch Playcards Learn more: Playcards

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  Learning Shorts

  Animated explainer video studio

  Turn an idea into a narrated, animated short video with presenters, props and captions.

  • 20 free animated lessons to watch, download and remix
  • Presenters, boards and transparent props on a scene timeline
  • Free neural narration or your own recorded voice
  • Projects stay on your device, no sign-up

  Launch Learning Shorts Learn more: Learning Shorts

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