CoreLink is your all-in-one productivity app, bringing the most powerful tools together in one elegant, easy-to-use place. No more jumping between scattered apps — everything you need is always in your pocket, whether at the office, traveling, or any moment you need a fast, reliable tool.
Why CoreLink?
Every day you waste precious time switching between separate apps for calculations, conversions, subscription management, time tracking, and date calculations. CoreLink puts it all under one roof: modern design, light and dark modes, ten global languages, instant auto-save, no account required, no external server. Your privacy is fully protected, always, without exception.
🔢 Scientific Calculator
Full-featured calculator supporting basic and advanced operations: sin, cos, tan, log, square root, π and e, with radian and degree support. CoreLink saves your complete calculation history for retrieval any time. Copy any result in one tap to use instantly anywhere.
💱 Currency & Unit Converter

Live converter pulling real-time rates for 150+ world currencies with zero delay.
Save favorite currency pairs for instant access without searching again.
Smart alerts that notify you when a rate reaches your chosen value.
Session stats: operation count, highest/lowest values, currencies used.
Unit converter: length, area, volume, mass, temperature, speed, pressure, energy, and more.

⏰ Time Tools
Nine specialized tools for all your time and date needs:

Age & Compatibility: exact age in years, months, days, hours, and minutes.
Calendar Converter: instant Gregorian ↔ Hijri conversion with advanced JDN engine.
Work Hours & Duration: calculate work hours, leave, and absence periods.
Time Zones: convert time between world cities and schedule international meetings.
Sleep & Health: track daily sleep quality with auto-scheduled water reminders.
Project Tracker: manage project deadlines with precise countdown timers.
Historical Events: explore notable events linked to any date you enter.
Event Countdown: never miss an important occasion with a dedicated countdown.
Date Calculator: add or subtract days, months, and years from any date instantly.

💳 Smart Subscription Manager
Full control over your monthly spending:

All subscriptions in one place with service details, billing cycle, and renewal date.
Dashboard showing total monthly and yearly spending at a glance.
Income & Budget: set monthly income and monitor what percentage goes to subscriptions.
Per-category budgets (entertainment, productivity, health…) with over-budget warnings.
Financial Timeline: all subscriptions on an interactive visual timeline.
Built-in converter to translate subscription costs to your local currency.
Period Calculator: compare monthly vs. yearly costs for the best deal.
Vacation Mode: pause tracking while traveling, resume anytime with one tap.
Renewal alerts in advance to avoid surprise charges to your bank account.
Export data as a professional PDF or share as an image with anyone.
Achievements system rewarding smart budget management.

⚙️ Unlimited Customization

10 full languages: Arabic, English, Spanish, French, German, Hindi, Chinese, Japanese, Russian, Turkish.
Light and dark mode with auto-follow system setting.
Modern, fluid design supporting all screen sizes.
All data saved locally on your device — full security and uncompromising privacy.

CoreLink — one tool that brings everything you need right into your hands.