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Cover of the ebook How to Remain Valuable When Intelligence Becomes CheapEbookHow to Remain Valuable When Intelligence Becomes Cheap — 224 pages on staying valuable as AI does more of the thinking. $3.84 on Gumroad. Get the ebook ↗

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The catalogEvery app, tool and game, searchable. Tools14 local utilities for everyday work. TopicsWorkflows that connect the tools and guides. GuidesPractical answers with a working tool inside. Install & notificationsOffline tools and optional site updates. EbooksThe paid guides that fund the free apps. In actionReal screenshots of live apps. How it worksWhere the data comes from, and where it stays. AboutThe platform, the person, the principles. FAQFree, private, account-free: answered. SitemapEvery public page, clickable.
Worlds
Book discovery Reader tools Planners & calculators Tools Games Experiments Reference Guides
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One domain, many worlds — by Yunus Emre Vurgun

Free web apps, tools & games that run in your browser.

48 small apps for reading, planning, learning and playing: rank books from Open Library, test your reading speed, size a camper-van power system, plan a mapping flight. No account, no required install, no tracking.

Browse the catalog
  • 48 apps
  • 8 worlds
  • 0 accounts
  • 0 trackers
  • Updated 11 Oct 2026

The catalog

Eight worlds, one block per app. Search or filter, then step in.

Book discovery

Live-ranked reading lists, merged from Open Library and Google Books as you open them.

7 apps
SciFiOrbit Live-ranked sci-fi & fantasy books from Open Library + Google Books. MindGrowth Live-ranked self-help, psychology & productivity books. WealthReads Live-ranked finance, investing & business books plus markets news. VitalReads Live-ranked health, nutrition & wellness books plus health news. TechReads Live-ranked AI, programming & technology books plus tech news. ThrillSeeker Trending thriller, mystery & suspense books, ranked live from two catalogs. BookMatch “What should I read next?” — pick a mood, get high-rated Open Library picks.

Reader tools

Private reading trackers. Your shelf, goals and notes stay in your own browser.

5 apps
ReadPace Test your reading speed in a minute, benchmark it against typical readers, estimate any book’s reading time, plan a finish date and export the schedule. NextRead Your private shelf: to-be-read list, progress, ratings, plus a yearly goal with a pages-per-day planning table. QuoteWell A quote of the day and a searchable library of classic literary lines across thirteen themes, with shareable permalinks, citations and favorites. BookBingo Reading-challenge bingo cards: pick a theme, mark books done, track lines, and share your card as a link. SeriesLog Your private book-series shelf: search titles, track planned / reading / finished, with reading-order guidance.

Planners & calculators

Plan it before you build or buy it: racks, vans, tanks, flights, cuts and seating.

10 apps
Rack Planner Lay out a server rack and check U-space, power, heat, weight and UPS size. Van Power Size the battery, solar and inverter for a camper van, RV or cabin. Wi-Fi Planner Estimate coverage, weak spots and how many access points a home needs. Pedalboard Planner Place pedals, check board space, total current draw and signal order. Cut Optimizer Turn a cut list into sheet layouts with waste, offcuts and material cost. Astro Calculator Field of view, pixel scale, framing and the star-trailing exposure limit. Drone Mission Plan a mapping flight: GSD, passes, photos, distance, time and batteries. Aquarium Planner Stocking level, fish compatibility and temperature / pH overlap for a tank. Seating Planner Turn a guest list and keep-together rules into a working table plan. Pattern Scaler Scale a sewing or craft pattern to your measurements, with a checklist.

Tools

Quiet single-purpose tools to write, calculate, time, save, colour and format.

21 apps
Bravest New World Six quiet browser tools: writing, calculator, timer, links, colors, JSON. ZenFocus Distraction-free writing with drafts, autosave, word goals, find, import and text, Markdown or print export. QuickCalc Everyday math, scientific keys, memory and unit conversions in one tool. TimeBox Pomodoro-style focus timer with duration presets, cycles, streaks, a weekly focus chart and a CSV session log. LinkVault Save and organize bookmarks with tags, notes, favorites and search. Palette Build WCAG-checked colour sets with harmony modes, contrast fixes, shareable links and CSS, Tailwind, SCSS or JSON export. JSONView Format, validate and inspect JSON with a collapsible tree, key and value search, JSON-path copying and error line numbers. Word Counter Count words, characters, sentences and paragraphs locally. Estimate reading and speaking time, with Unicode-aware counting and no text uploads. Text Case Converter Convert text to uppercase, lowercase, title case or sentence case. Clean extra spaces, preserve paragraphs and copy the result without uploading a draft. Markdown Preview Preview Markdown headings, lists, links, quotes and code locally. Raw HTML stays escaped; copy or download a safe HTML fragment without an account. URL Encoder / Decoder Encode or decode URL components with UTF-8 support. Handle spaces and plus signs explicitly, inspect malformed escapes and keep input in your browser. Base64 Encoder / Decoder Encode and decode Unicode text as Base64 or Base64url in your browser. Check invalid input and UTF-8 errors without uploading private strings. CSV ↔ JSON Converter Convert CSV to JSON objects and back locally. Handle quoted commas, escaped quotes and multiline fields, with strict headers and clear row errors. Timestamp Converter Convert Unix seconds or milliseconds to UTC and local time. Convert an ISO date back, check invalid dates and avoid guessing timestamp units. UUID Generator Generate up to 100 UUID v4 identifiers with browser cryptography. Copy newline-separated IDs or download them locally, without a server round trip. Password Generator Generate random passwords locally with cryptographic randomness. Choose length and character sets, exclude ambiguous symbols and copy without saving. File Hash Checker Calculate SHA-256, SHA-384 or SHA-512 for a local file in your browser. Compare an expected checksum without uploading the file or storing its contents. Aspect Ratio Calculator Simplify width-to-height ratios and calculate a matching dimension. Use common video and photo presets, keep proportions and compare a target frame. Image Print Size Calculate print dimensions from pixels and PPI, or pixels needed for a print. Compare 150 and 300 PPI and distinguish image resolution from printer DPI. Percentage Calculator Calculate a percent of a number, percentage change and symmetric percentage difference. See the formulas, signs and zero-baseline limits clearly. Color Contrast Checker Check text and background color contrast with the WCAG relative-luminance formula. See AA and AAA results for normal and large text, with live previews.

Games

A space shooter whose enemies learn to hunt you with TensorFlow.js.

1 app
NeuroVoid A space shooter whose enemies learn with TensorFlow.js.

Experiments

What a browser can do on its own: headlines, a neural network and a graph.

1 app
NewMind News correlation engine: RSS headlines + a browser-side neural network.

Reference

Numbers worth checking: essential maths in plain English, and the SaaS industry benchmarks private B2B companies are measured against.

2 apps
Equations Essential math equations explained in plain English. SaaS Benchmarks Private B2B SaaS benchmarks: growth, retention, margin, efficiency and valuation multiples, charted and sourced.

Guides

Practical long-form guides for people who ship software.

1 app
Headless Agents A practical guide to running coding agents headlessly: activation, delegation, review loops, CI and safety.

Start with what you want to do.

Tools, explanations and the next step, connected by topic.

Writing & editing toolsMove from a rough idea to a clean draft. Count what matters, fix the casing, preview the structure and make room for a focused writing session. Data conversion & developer toolsConvert a representation without losing the meaning. These small utilities cover text encodings, spreadsheet rows, identifiers and timestamps without sending your input to a server. Privacy & everyday security toolsGenerate locally, verify deliberately and understand what a tool can prove. A random password, an identifier and a file checksum solve different problems. Design, image sizing & accessible colorMake images fit and text stay readable. Work through shape, pixel density and contrast as separate decisions before exporting a final asset. Reading goals, book discovery & trackingFind a book you want to open, then make a reading plan that fits your week. Browse public catalogs, measure a comfortable pace and keep your shelf in your own browser. Home lab, network & server planningMeasure the equipment you own before sizing the equipment you might buy. Plan rack space, power, backup time and Wi-Fi coverage with visible assumptions. Camper van & off-grid power planningSeparate energy used over a day from power used at one moment. A useful first plan makes loads, runtime and conversion losses visible before any equipment is selected. Creative projects, layouts & practical plannersTry the layout before cutting material, packing a board or arranging a room. Keep measurements in consistent units and use a first draft to surface constraints.

Browse the new utilitiesInstall & offline access

Guides

The latest practical guides, with a working tool inside, clear assumptions and original sources.

All guides
Check accessible color contrast for real text and backgrounds Calculate WCAG text contrast, apply normal and large-text thresholds correctly and test actual backgrounds, focus and interaction states without rounding up. 4 min read · tool inside Resize an image without stretching: aspect ratios explained Simplify aspect ratios, calculate a missing dimension and choose between fitting, cropping and stretching with practical image and video examples. 3 min read · tool inside Check a file’s SHA-256 checksum without uploading it Hash a local file, compare a trusted SHA-256 digest and understand mismatches, exact bytes, authenticity limits and browser memory constraints. 4 min read · tool inside How to count words and estimate reading time Count words consistently, handle Unicode and punctuation, and turn a draft length into reading or speaking time with clear assumptions and worked examples. 4 min read · tool inside Convert CSV to JSON without losing IDs, quotes or rows Convert CSV and JSON carefully: preserve leading zeroes, handle quoted commas and multiline fields, validate headers and protect spreadsheet exports. 4 min read · tool inside Generate strong passwords without sending them to a server Create unique random passwords locally, choose a practical length and alphabet, understand unbiased sampling and store the result in a password manager. 4 min read · tool inside Preview Markdown safely and export a clean draft Structure a Markdown draft with headings, lists, links and code. Understand dialect differences, escaped HTML and what to check before exporting a document. 3 min read · tool inside Percentage change vs difference vs percentage points Choose the correct percentage formula, work through signed change and symmetric difference, and distinguish relative changes from percentage points. 4 min read · tool inside

From the author's desk

Every app above is free, forever. These are the paid deep-dives that fund them: guides and toolkits from the author's Gumroad store, each one paired with the free app where its ideas run.

Browse the full store ↗

AI & Financial Freedom

Build wealth in the age of intelligence.

What's inside

A practical guide to building wealth as AI reshapes work: what actually changes, which skills compound, and how to position yourself while the window is open.

Try the ideas free in WealthReads and TechReads

$12.43$6.72 Get it on Gumroad ↗

On-Device Chatbot Builder Toolkit

Ship a chatbot that keeps user data on the device.

What's inside

An engineering field kit for bounded, inspectable, privacy-first conversational systems: domain definition, knowledge-base architecture and lightweight intelligence — no giant generative model required. From the ReLU.chat project.

Try the ideas free in Headless Agents guide and NewMind

$29.00 Get it on Gumroad ↗

Machine Learning Decision Toolkit

Pick models like an engineer, not a leaderboard.

What's inside

A reusable framework for evaluating models, providers and deployment approaches against what matters for your workload: quality, reliability, latency and cost. From the KnowYourML project.

Try the ideas free in NewMind and NeuroVoid

$24.00 Get it on Gumroad ↗

Digital Workflow Toolkit

Stop doing the same file chores by hand.

What's inside

Workflow recipes, templates and automation patterns for combining small digital operations into reliable end-to-end processes: file processing, document transformation, messy-data cleanup. From the itsfully.online project.

Try the ideas free in Cut Optimizer and Pattern Scaler

$19.00 Get it on Gumroad ↗

Builder's Knowledge System Kit

Turn scattered notes into a system that answers back.

What's inside

A reusable capture → classify → connect → maintain → retrieve → archive framework for developers, researchers and independent creators. From the gor.bio project.

Try the ideas free in NextRead and SeriesLog

$19.00 Get it on Gumroad ↗

Plant Rescue & Care Toolkit

Diagnose a struggling plant from its symptoms.

What's inside

Guides, decision trees, trackers and printable worksheets that work from observable symptoms toward the right response — instead of generic gardening advice. From the AIPlanter project.

$12.00 Get it on Gumroad ↗

The Canva-to-KDP Zero

Publish a coloring book that survives Amazon review.

What's inside

The shortest path from a blank prompt box to a submitted KDP paperback, with the smallest number of rejection risks and zero wasted hours on workflows that fail human review.

Try the ideas free in Palette

$4.99 Get it on Gumroad ↗

The Shadow Algorithm

Understand what dating apps actually rank.

What's inside

A clear-eyed look at the hidden scoring behind dating-app visibility — who sees you, who never reaches you, and what to do about it.

$4.99 Get it on Gumroad ↗

Real apps, live right now

Not mockups — these are the actual pages running on apprun.icu today, captured from a live browser.

ReadPace: the timed reading passage with the clock running, the comprehension check and the words-per-minute result ReadPaceReading speed test & reading-time planner QuoteWell: the quote of the day with its author credit and copy, save and share controls QuoteWellA quote a day & a classic library
TimeBox: the focus dial, duration presets, today's stats and the session log TimeBoxPomodoro-style focus timer ZenFocus: the drafts sidebar next to the writing sheet with word, character and read-time counts ZenFocusDistraction-free writing
Palette: five generated swatches with lock controls beside WCAG contrast pairs and the CSS export PaletteWCAG-checked color sets JSONView: the formatted JSON beside the collapsible tree, node inspector, search and live stats JSONViewFormat & inspect JSON
  • No accounts everything works in your browser
  • No tracking no analytics, no profiles
  • Refreshed live ranking data re-runs on demand

How apprun works

Public data in. Private browsing out.

Public catalogs (Open Library, Google Books) and news feeds enter through a first-party proxy — no keys, no identity — and the apps rank them for you. Your reader data stays in your browser’s local storage; nothing is uploaded.

About the hub

apprun.icu is one domain, many worlds. It hosts a growing collection of small, self-contained web apps — each with its own page, its own purpose, and nothing shared between them except a domain. Book discovery engines merge Open Library and Google Books into live-ranked lists; reader tools keep your shelf private in your own browser; the tools under Bravest New World stay quiet and focused; and the games and experiments explore what a browser can do.

Everything here is free, account-free and tracking-free. Apps that use data keep it in your browser's local storage; catalog lookups go through a first-party proxy that never sees your identity. The platform is not open to external contributions or uploads — every app is built by Yunus Emre Vurgun.

Content changes are announced through the RSS feed, indexed in the XML sitemap, and summarized for AI crawlers in llms.txt and llms-full.txt.

Private by default

Reader data, notes and settings live in localStorage — kept on this device. Optional push subscriptions are described in our privacy policy.

Fresh & discoverable

New apps and updates are published in RSS, the sitemap and LLM indexes.

Made by one person

Yunus Emre Vurgun builds and maintains every app — see more at yunusemrevurgun.com.

Frequently asked questions

What is apprun.icu?

A personal platform by Yunus Emre Vurgun: one domain hosting many independent, self-contained web apps — live-ranked book discovery, reading trackers, engineering planners, productivity tools, a neural-network game and reference pages. One domain, many worlds.

Are the apps free, and do I need an account?

Every app is free to use, with no account, no payment and no sign-up — nothing sits behind a login. Some pages carry a book-shop widget and occasional offers from the author’s Gumroad store; those paid guides are what fund the free apps.

Do the apps collect my data?

Tool input stays in your browser; some existing apps use local storage for drafts and lists. Book and news apps request public data through first-party proxies. Optional notifications store a push subscription only after you enable them. Ordinary hosting and security logs can contain request information; see the Privacy page for details.

Do the apps work offline?

The 14 new local utilities can be saved together from the Install page. Previously visited public pages can also be cached for offline use. Book catalogs, news and other live data require a connection. Browser storage can be evicted, so export important work.

Can I publish my own app on apprun.icu?

No. apprun.icu is not open to external contributions or uploads; every app is created and maintained by Yunus Emre Vurgun.

New apps land here often.

One feed carries every new app and update as the catalog grows — no newsletter, no email address, nothing to sign up for.

Follow the RSS feed or view the full sitemap