30+ Mobile Apps for Everyday Life

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A growing collection of free Android apps and iOS productivity tools — budgeting, paychecks, mortgage math, fitness, sleep, alarms, language learning, travel, and Hong Kong daily life. Built privacy-first, designed to work even offline.

Made by Hill, an independent developer based in Hong Kong. Thirty+ shipped apps focused on small tools that solve real, recurring problems — without ads invading your data flow or accounts you don't want.

Browse by Category

Finance

WealthMind, mortgages, paychecks, tips, debt-free plans, rental yield, FX, investing.

Health & Fitness

BMI, body-fat, calm pill tracker, white-noise sleep, decibel meter.

Travel

VAT refund, long weekend planner, travel checklist, nearby finder, Passport Rush.

AI & Learning

Memora, SpeakLocal — on-device AI memory and language coaching.

Hong Kong

MTR Pass, KMB bus, weather, price watch, parking finder — local life made simple.

Camera & Documents

GPS Camera field proof and CleanScan offline PDF scanning — capture, timestamp, and file.

All Apps — 33 titles across 6 categories

★ Featured New A–Z

Finance & Money

WealthMind: Budget & Finance app icon

WealthMind: Budget & Finance

Private budgeting, net worth, and FIRE planner

An offline-first personal finance app. Envelope budgeting, debt payoff, FIRE projection, and an on-device AI Advisor — without an account or a server round-trip.

  • Envelope budgeting + rollover
  • Net worth + FIRE projection
  • AES-256 encrypted backups
  • Biometric / PIN app lock
  • 100% offline, zero accounts
Paycheck Calculator app icon — U.S. paycheck calculator

Paycheck Calculator

U.S. paycheck math, side-by-side scenarios

Estimate what really lands in your bank account after federal, FICA, state, and city wage taxes. Compare two saved scenarios side by side.

  • 2025 IRS percentage-method tables
  • 50 states + 11 major city wage taxes
  • Side-by-side scenario compare
  • What-If sliders: raise / 401(k) / bonus
  • Works offline
Mortgage & Loan Calculator app icon — U.S. mortgage and refinance calculator

Mortgage & Loan Calculator

U.S. mortgage math, never a lender funnel

PITI, PMI/MIP, FHA/VA/USDA, refinance break-even, and DTI affordability — calmly designed, offline, and not trying to sell you a loan.

  • Full PITI + PMI / MIP
  • FHA, VA, USDA scenarios
  • Refinance break-even calc
  • DTI affordability check
  • No lender lead-gen — your data stays put
Tipright: Tip Calculator app icon

Tipright: Tip Calculator

Restaurant tip math, no awkwardness

The fastest way to calculate a tip and split a bill. Three taps to a correct per-person number, with a clean dark UI for dim restaurant lighting.

  • Instant tip calculation as you type
  • Split between 2–20 people
  • Presets: 10 / 15 / 18 / 20 / 25%
  • Round Up for clean cash splits
  • Works fully offline
Credit Card Payoff Plan app icon — credit card payoff calculator

Credit Card Payoff Plan

See your debt-free date in seconds

A premium debt-free date and credit-card payoff calculator. Avalanche, snowball, and a clear visual of when you actually stop paying interest.

  • Avalanche vs snowball comparison
  • Multi-card payoff timeline
  • Interest saved at a glance
  • Extra-payment what-if
  • Offline, no signup
Rental Yield & ROI Calculator app icon — property investment ROI

Rental Yield & ROI Calculator

Property ROI for global investors

Rental yield and ROI calculator for global property investors. Gross yield, net yield, cap rate, cash-on-cash return — in any currency.

  • Gross + net yield
  • Cap rate + cash-on-cash return
  • Multi-currency, multi-market
  • Compare properties side by side
  • Offline
Dividend Calculator & ETF SIP app icon — compound interest projection

Dividend Calculator & ETF SIP

Compound interest, projected growth

A clean compound interest and investment growth projection calculator. See how a monthly contribution becomes a future number — without a brokerage account.

  • Compound interest projection
  • Monthly contribution model
  • Inflation-adjusted preview
  • Reset / save scenarios
  • Offline
RateRadar app icon — should I exchange money today

RateRadar

Should I exchange money today?

An FX rate radar that tells you whether today is a good day to exchange. Tracks your watched currency pairs and surfaces the moment to act.

  • Multi-pair FX watchlist
  • "Today's call" recommendation
  • Historical band visualisation
  • Push alert when a target hits
  • HKD / USD / EUR / JPY / GBP / RMB

Health, Sleep & Fitness

BMI Calculator app icon — healthy weight tracker

BMI Calculator

Healthy weight tracker, no nonsense

BMI calculator with a calm, judgment-free healthy-weight tracker. Metric and imperial. No coaching upsell, no body-shaming UI.

  • Metric & imperial units
  • Adult + child BMI charts
  • Trend over time
  • Daily weigh-in reminder (optional)
  • Offline
Lean Body Fat and Fitness Calculator app icon

Lean — Body Fat & Fitness

U.S. Navy method, calm UI

A calm, modern body fat & fitness calculator. U.S. Navy circumference method, BMR/TDEE, and a progress view without the hospital-form aesthetic.

  • U.S. Navy body-fat method
  • BMR & TDEE estimation
  • Progress chart
  • Metric + imperial
  • Offline, no signup
Pill Dot app icon — one-tap medication tracker

Pill Dot

One-tap medication tracker

Ultra-simple one-tap medication tracker. No accounts, no diagnoses, no scary medical UI. One dot, one tap, today done.

  • One-tap "took it today"
  • Per-medication streaks
  • Calm visual calendar
  • Optional gentle reminders
  • Offline, no PHI in the cloud
Hushh app icon — white-noise sleep app

Hushh

White noise built for the dark bedroom

A white-noise sleep app with calm-quality audio. One-time pricing, no subscriptions, and a UI that won't blast your eyes at 2am.

  • High-quality white / brown / pink noise
  • Mix & loop your own scene
  • One-time price — no subscription
  • OLED-friendly black UI
  • Plays in airplane mode
Wakey app icon — alarms that actually wake you up

Wakey

Alarms that actually wake you up

Alarms designed to actually wake you up — escalating sound, smart snooze that doesn't let you sleep through, and a wake-window that respects your sleep cycle.

  • Escalating alarm volume
  • Smart snooze (not infinite)
  • Wake-window mode
  • Math / shake puzzle dismissal
  • Reliable under aggressive battery savers
Decibel Meter app icon — sound level meter

Decibel Meter

Sound level meter, on-device

A pocket sound level meter. Measure ambient noise in dB, log a session, and find out whether that café is actually as loud as it feels.

  • Real-time dB reading
  • Min / max / average over a session
  • Clean dial UI
  • OSHA / WHO reference bands
  • Offline, no audio uploaded

AI, Memory & Learning

Memora app icon — private offline-first memory keeper

Memora

An AI that remembers — privately, on your phone

Chat naturally. Memora quietly extracts the things worth remembering — events, places, people, milestones — and lets you scroll your life back like a timeline. AI runs on your device, not in someone's cloud.

  • Trilingual: English / 繁中 / 日本語
  • Auto memory extraction + timeline
  • Optional neural voice (Kokoro)
  • "On This Day" weekly reminders
  • Zero data leaves your phone
SpeakLocal app icon — offline AI language tutor

SpeakLocal

The only AI language tutor that never uploads your voice

Practise speaking English, Mandarin, or Japanese with an on-device AI tutor that listens, responds, and corrects — across 25 real-world scenarios from coffee shops to job interviews.

  • 25 scenarios × 3 languages
  • Pronunciation score every turn
  • Spaced-repetition vocab vault
  • Works in airplane mode
  • Voice never leaves the device

VaultMind

A private AI journal built for ADHD minds

An ADHD-friendly journal with an on-device AI that reads your entries, detects mood, and surfaces patterns — without a single word leaving your phone. Talk or type; everything is encrypted on the device.

  • On-device Gemma AI — insights generated locally
  • Hold-to-talk with on-device transcription
  • ADHD mood tags + 30-day mood trends
  • AES-256 encrypted storage; optional encrypted backup (Pro)
  • One model download, then fully offline

Camera, Scanning & Documents

GPS Camera — Geotag & Timestamp

Proof photos with coordinates, address & time

A field camera that burns the GPS coordinates, street address, and exact time straight onto every photo and video — so the picture is its own evidence. Built for site records, insurance claims, and anywhere a plain photo isn't enough.

  • Coordinates + address + timestamp on the shot
  • Classic & Bar caption styles, company label
  • Writes real EXIF GPS to the file
  • Geotagged video + on-device text scan (OCR)
  • Optional logo watermark · 100% offline
Learn more about GPS Camera →

CleanScan — Offline PDF Scanner

Clean scans & find any old invoice fast

Turn your phone into a clean, fully offline document scanner — then search your scan history to pull back an old receipt by date, amount, or store name. Nothing is uploaded; a document only leaves your device when you choose to share it.

  • Auto edge-detect, shadow removal, crisp B&W
  • OCR — find old invoices by date, amount, or store
  • Password-protect (AES) PDFs
  • QR / barcode scan, translate, read aloud
  • Reorder / rename pages · 100% offline
Learn more about CleanScan →

Travel & Adventure

VAT Refund Calculator app icon — tax free travel

VAT Refund Calculator

Tax-free travel across 38 countries

Estimate tourist VAT/GST refunds before you check out. Covers 38 countries with up-to-date thresholds and rates.

  • 38 countries supported
  • Country-specific min spend rules
  • Net-refund estimate (operator fees in)
  • Save receipts as scenarios
  • Offline
Long Weekend Planner app icon — maximise annual leave

Long Weekend Planner

Turn leave days into the longest breaks

Max your days off across 40 countries. Plug in your annual leave, see the longest possible breaks built around public holidays.

  • 40 countries' public holidays
  • Optimal leave-day suggestion
  • Multi-year planner
  • Calendar export (ICS)
  • Offline once installed
Travel Checklist app icon — pre-trip packing

Travel Checklist

A pre-trip packing list that doesn't nag

A calm pre-trip packing and prep checklist. Templates for business, beach, hiking, ski, and family travel. Reusable, savable per trip.

  • Trip templates by purpose
  • Multi-trip support
  • Bag-by-bag grouping
  • Recurring items remembered
  • Offline-first
Travel Tools Hub app icon — currency tips time zones

Travel Tools Hub

Currency, tips, and time zones in one

A calm travel utility that bundles the three things you reach for on every trip — currency conversion, tipping etiquette, and time zones — into one no-fuss app.

  • Multi-currency converter
  • Country-specific tipping guide
  • Time-zone strip for your itinerary
  • Works offline after first sync
  • No subscription

Nearby

Travel companion for restaurants & restrooms

Find restaurants, attractions, restrooms, and hotels around you. A travel companion that doesn't try to be Google Maps.

  • One-tap nearby categories
  • Distance + open-now filter
  • No account, no tracking
  • Save to "visited"
  • Works in any city
Passport Rush app icon — arcade runner across 30 countries

Passport Rush

Arcade runner across 30 countries

Race through 30 real-world destinations — Tokyo, Rome, Cairo, Rio, Paris — collecting boarding stamps. Each country plays differently.

  • 30 destinations, 30 unique modifiers
  • Daily mission + postcard wall
  • Daily Spin for boosters & jackpots
  • In-lane powerups
  • Six unlockable travellers
World Clock app icon — time zones across the globe

World Clock

Time zones for global teams & travellers

Track time zones across the globe with a clean strip view. DST-aware, drag-to-reorder, and a meeting planner that highlights everyone's overlap.

  • Add unlimited cities
  • DST-aware
  • Meeting overlap view
  • Drag to reorder
  • Offline

Hong Kong Daily Life

HK MTR Pass app icon — Hong Kong MTR real-time train info

港鐵通 — HK MTR Pass

Real-time train info, elderly-friendly

Real-time Hong Kong MTR train info, designed for older eyes. Big tap targets, high contrast, no clutter, no ads.

  • Real-time arrival countdowns
  • Elderly-friendly large UI
  • All MTR lines + Light Rail
  • Last-train alerts
  • Works on cellular and Wi-Fi
HK Bus app icon — KMB bus arrival times

九巴通 — HK Bus (Elderly Edition)

KMB bus times, bigger and calmer

Hong Kong KMB bus arrival times in a large-text, high-contrast layout. The "this stop, this minute" answer, without the carousel hell.

  • Real-time KMB arrival times
  • Stop-first UI (not route-first)
  • Favourite stops
  • Large-text accessibility mode
  • Cantonese + English
HK Weather app icon — Hong Kong weather and typhoon

香港天氣通 — HK Weather

Typhoons, rain warnings, calmly

Hong Kong weather with a focus on the things that actually matter: typhoon signal status, amber/red/black rain warnings, and a clean today/tomorrow view.

  • HKO typhoon signal at a glance
  • Rain warning levels
  • 9-day forecast
  • Nine-region temperature strip
  • Cantonese + English
HK Price Watch Pricly app icon — Hong Kong supermarket price comparison

Pricly — 慳家通

HK supermarket price watch

A Hong Kong supermarket price watch. Compare ParknShop, Wellcome, AEON, and friends side-by-side on the items you actually buy.

  • Watch your shopping list
  • Cross-chain price compare
  • Deal-of-the-week feed
  • Cantonese + English UI
  • No login
HK Parking Finder app icon — Hong Kong parking availability

香港泊車王 — HK Parking

Real-time HK parking availability

Real-time Hong Kong parking lot availability. Open this before you cross the harbour — not after.

  • Live vacancy across HK car parks
  • Hourly rate displayed
  • Map + list view
  • Favourite frequent lots
  • Cantonese + English

難搵工 — HK Job Sim

A Hong Kong job-hunt simulator — just for fun

A tongue-in-cheek Hong Kong job-hunting simulation game. Fire off CVs, survive the interview grind, and keep the rent paid on a tight salary. Purely for entertainment — it is a game, not a real job service.

  • Apply for jobs & grind through interviews
  • Balance salary against HK living costs
  • Multiple careers & endings
  • Cantonese, quick pick-up-and-play
  • Just for fun — no real listings

住得到 — HK Property Sim

Chase the Hong Kong home-owner dream — a game

A Hong Kong "get on the property ladder" simulation game. Save, buy, flip and climb from tenant to landlord, with in-game prices seeded from real data.gov.hk figures. Purely for entertainment — not financial advice.

  • Simulate the whole buy-a-flat journey
  • In-game prices seeded from data.gov.hk
  • Tycoon mode + leaderboard
  • Cantonese, HK-flavoured
  • Just for fun — not financial advice

Why So Many Small, Offline-First Apps?

The best mobile apps for daily productivity are the ones that disappear when you don't need them and show up exactly when you do. A good budgeting app on Android tells you whether you can actually afford this month's grocery splurge without making you log into a bank. A good paycheck calculator app for iOS lets you compare two job offers on the subway home from the interview. The point of a great mobile productivity tool isn't to replace your life — it's to remove a single, recurring point of friction.

Offline-first finance apps matter more every year. Cloud-synced budgeting tools have repeatedly suffered breaches, sold "anonymized" spending histories, and shut down at the worst possible moment. An offline budgeting app for Android with AES-256 encrypted backups gives you the cross-device safety you want with none of the third-party risk you don't. The same principle applies to tip calculators, paycheck estimators, mortgage calculators, net-worth trackers, and rental-yield tools: your numbers belong to you, not to a SaaS dashboard.

Travel apps for modern travellers are quietly going the same way. Whether you're learning Japanese on a flight to Osaka with an on-device AI language tutor, running through 30 countries in an arcade game during a layover, or checking real-time HK MTR train times before stepping into Causeway Bay station, the apps that work in airplane mode are the ones you actually open. That's the design rule behind every app on this page: useful in the first thirty seconds, no signup wall, no analytics SDK shadowing you, and always functional without a connection.

Field Proof and Paperless Filing: Two New Tools

GPS Camera: when a photo has to prove where and when

Some jobs need more than a snapshot — they need proof. GPS Camera stamps the coordinates, address and exact time onto every photo and video, and writes real GPS into the file's EXIF, so a shot from a work site, an accident scene or an insurance claim speaks for itself. Read the full guide →

CleanScan: scan on the go, and find that old invoice in seconds

A pocket scanner for people who are never at a desk when they need a PDF. CleanScan clears the shadow and skew for a crisp offline scan, then uses on-device OCR so you can pull back any past receipt by its date, amount or store name — perfect for expense claims. Read the full guide →

Need these tools on desktop?

All 12 privacy tools run directly in your browser. No install. No upload.

Open the Browser Tools →

Try Our Apps — Free to Download

Every app on this page is free to try. If something here helps your day, the kindest thing you can do is leave a short review on the Play Store, or send the link to one friend who'd use it. That's how indie apps survive.

Frequently Asked Questions

Are these apps free?

Yes. Every app on this page has a free tier you can use forever with no signup. A small optional Pro tier exists on a few apps to support ongoing development, but it never gates basic functionality.

Do the apps work offline?

All finance, fitness, sleep, language, memory, and utility apps run fully offline after install. Travel, transit, and weather apps fetch live data from their respective public sources.

Which platforms are supported?

Most apps launch on Android first via Google Play. iOS versions are rolled out where the underlying SDKs (on-device AI, on-device speech) reach feature parity on Apple platforms.

How do I contact support?

Use the Contact page on this site or reach out via the in-app Settings → Support link on any installed app. We reply within a few business days.

Are these apps safe and private?

Yes. Every app is built privacy-first. Finance apps run 100% on-device with optional AES-256 encrypted backups. The AI apps never upload your data — inference runs on your phone, not on our servers.