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.
WealthMind, mortgages, paychecks, tips, debt-free plans, rental yield, FX, investing.
BMI, body-fat, calm pill tracker, white-noise sleep, decibel meter.
VAT refund, long weekend planner, travel checklist, nearby finder, Passport Rush.
Memora, SpeakLocal — on-device AI memory and language coaching.
MTR Pass, KMB bus, weather, price watch, parking finder — local life made simple.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
One-tap medication tracker
Ultra-simple one-tap medication tracker. No accounts, no diagnoses, no scary medical UI. One dot, one tap, today done.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Travel companion for restaurants & restrooms
Find restaurants, attractions, restrooms, and hotels around you. A travel companion that doesn't try to be Google Maps.
Arcade runner across 30 countries
Race through 30 real-world destinations — Tokyo, Rome, Cairo, Rio, Paris — collecting boarding stamps. Each country plays differently.
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.
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.
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.
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.
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.
Real-time HK parking availability
Real-time Hong Kong parking lot availability. Open this before you cross the harbour — not after.
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.
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.
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.
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.
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.
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.
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.