Word games, wallpaper apps, and how they are made

Walls & Words is one developer and two kinds of Android app. The words are five games that run on a single map of how English words relate in meaning. The walls are sixteen wallpaper collections, each about one subject. Around them sit eight free browser tools and a blog that explains the thinking behind all of it. Everything is free, works offline where it can, and never asks you to create an account.

Word games

Five games, one idea: treat a word as a point on a map of meaning rather than a string of letters. Proximity ranks every guess by how close it is to a hidden word. Traverse asks you to cross the map one small step at a time. Quartet and Outlier build sorting puzzles that are checked to have exactly one answer. Huddle turns the same map into party-game cards. All five are on the games page.

Proximity icon
Proximity: Word Game
One secret word a day. Every guess comes back ranked by how close it sits in meaning.
Quartet icon
Quartet: Word Groups
A 4×4 grid hiding four groups of four. Every word fits exactly one — the trap is the near miss.
Outlier icon
Outlier: Odd One Out
Five words, one tap. Ten thousand checked rounds across 99 categories. Sprint, survival or daily.
Traverse icon
Traverse: Word Chain
Bridge one word to another using only words that sit close in meaning to the last. Par is the shortest route.
Huddle icon
Huddle: Party Word Games
Two pass-the-phone party games. Describe a word without its five nearest neighbours, or catch the impostor.

Free browser tools

Eight small tools that run entirely in your browser — no uploads, no sign-up. Any image you pick is processed on your own device and never leaves it. They're all on the tools page.

🔋 Dark Wallpaper Battery Calculator
Estimate how much battery a darker wallpaper really saves on your AMOLED phone — with the assumptions shown, not hidden.
🎨 Colour Palette Extractor
Drop in any image and pull out its dominant colours as hex and HSL, with a suggested Material You accent.
📱 Wallpaper Preview Mockup
See how a picture looks behind a lock-screen clock or a home-screen icon grid before you commit to it.
📊 Phone Display Database
A sortable, searchable table of popular phone screens — panel type, resolution, PPI, refresh rate, brightness and PWM.
🧭 Wallpaper Theme Finder
Six quick questions that point you at the wallpaper theme — and the app — that best matches your taste.
🔎 Contrast & Legibility Checker
Measure the brightness behind your clock, icon labels and dock, and find out whether white or black text stays readable — with WCAG ratios.
✂️ Wallpaper Resizer & Cropper
Crop and scale any image to your phone’s exact resolution, with optional parallax overscan, then download it.
🌈 Material You Scheme Builder
See the tonal palette and the light and dark interface Android would build from a wallpaper, before you set it.

The wallpaper apps

Sixteen themed Android apps, each focused on one clear subject — a city, an art style, or a category like animals or chess. All are free, lightweight, and curated by hand. Tap any card below to see sample wallpapers, theme notes and styling tips.

Paris Wallpaper app icon
Paris Wallpaper
Eiffel Tower, the Seine and golden-hour boulevards.
Rome Wallpaper app icon
Rome Wallpaper
The Colosseum, ancient ruins and warm Mediterranean light.
Venice Wallpaper app icon
Venice Wallpaper
Canals, gondolas and pastel facades on the water.
London Wallpaper app icon
London Wallpaper
Big Ben, red buses and the Thames at dusk.
Washington DC Wallpaper app icon
Washington DC Wallpaper
The Capitol, monuments and cherry blossoms.
Detroit Wallpaper app icon
Detroit Wallpaper
Motor City skylines, murals and industrial grit.
New York Wallpaper app icon
New York Wallpaper
Manhattan skyscrapers, yellow cabs and neon nights.
Hollywood Wallpaper app icon
Hollywood Wallpaper
Sign-lit hills, palm streets and golden-age glamour.
Tokyo Wallpaper app icon
Tokyo Wallpaper
Neon Shinjuku, Shibuya crossing and cherry blossom.
Hong Kong Wallpaper app icon
Hong Kong Wallpaper
Victoria Harbour, neon signs and packed skyline.
Chess Wallpaper app icon
Chess Wallpaper
Boards, pieces and the quiet geometry of the game.
Animal Wallpaper app icon
Animal Wallpaper
Wildlife portraits, from big cats to garden birds.
Cinema Wallpaper app icon
Cinema Wallpaper
Film-inspired frames, projector glow and movie mood.
Girl Art Wallpaper app icon
Girl Art Wallpaper
Soft illustrated portraits in a dreamy art style.
Girl Wallpaper app icon
Girl Wallpaper
Aesthetic fashion and lifestyle photo wallpapers.
Ghost Wallpaper app icon
Ghost Wallpaper
Dark, moody backgrounds for fans of the eerie.

Featured guides from the blog

Most "best wallpaper" articles repeat the same generic advice. These pieces try to do something different: explain why a wallpaper fails behind your icons, what OLED actually changes about the choice, how much battery a dark image really saves (with measured numbers), which composition rules genuinely matter for a tall phone screen, how to size an image so it does not arrive on your screen soft or badly cropped, and what in Android customization is worth changing beyond the wallpaper itself.

OLED, LCD and LTPO Explained

What the screen technology in your phone actually means — true blacks, subpixel layouts, PWM dimming — and the practical wallpaper implications for each.

Read More →

Mobile Photography Composition: Nine Rules That Work

The composition rules worth following on a phone — and the ones to break. With concrete examples, exceptions, and a one-week practice routine.

Read More →

Why Dark Wallpapers Save Battery — With Numbers

How much a dark wallpaper actually saves on AMOLED (1–4% in normal use, not the dramatic numbers often claimed), where the saving comes from, and what affects your battery more.

Read More →

A Practical Guide to Color Theory for Phone Wallpapers

Hue, saturation and value in plain language; the three palette relationships that actually matter; and how to apply them so your wallpaper works behind your icons.

Read More →

Wallpaper Resolution and Aspect Ratio

Why wallpapers look soft, crop badly or turn blocky on a phone — and how to get resolution, aspect ratio, cropping and file format right the first time.

Read More →

Android Customization in 2026

Launchers, icon packs, widgets and Material You — what is genuinely worth changing beyond the wallpaper, and what only costs you battery and an evening.

Read More →

More on the blog

Seven more articles cover a short history of the digital wallpaper, how to choose a wallpaper, what's really trending in 2026 (and what's marketing recycled from last year), why cities dominate as a wallpaper category, the research on nature imagery and stress, how to evaluate a wallpaper app on Google Play and a month-by-month seasonal rotation plan. All sixteen articles — including three on how the word games are built — are listed on the blog index.

What this site is — and isn’t

What it is

An independent solo project. The games and the apps are hand-built; the articles are hand-written; the editorial position is independent of any phone manufacturer, OS vendor, or games publisher. The blog now covers two things: how word games can be built from a map of meaning, and the practical side of phone personalization — display technology, composition, colour, and Android customization — across sixteen substantive articles.

What it isn’t

A download dump or a review farm. The site hosts no wallpaper files and no APKs — the apps live on Google Play, where they belong. The game and theme pages here are explanations, previews and honest notes on what each one does well, not a substitute for the app and not a sales pitch.

Who makes it

One independent Android developer who has been shipping apps on Google Play since the mid-2010s and writes about what he actually builds. The full story, and the editorial standards, are on the About page.