DeltaClock vs ONE WATCH
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
DeltaClock
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DeltaClock is a stylish world clock and time zone meeting planner built for people who work across multiple time zones. If you collaborate with teammates, clients, friends, or family in different countries, DeltaClock helps you compare cities, convert time zones, and schedule meetings without guesswork. A WORLD CLOCK YOU CAN MOVE THROUGH TIME Most world clock apps only show βnowβ. DeltaClock lets you scroll time forward or backward to preview any moment: β’ Add your key cities and instantly compare local time in each time zone β’ Scrub the timeline to answer βWhat time will it be there?β in seconds β’ See day and night changes, date rollovers, and time differences visually β’ Reduce mistakes during daylight saving time changes (DST) TIME ZONE REMINDERS THAT MAKE SENSE Create reminders based on the time in another city, and DeltaClock converts it to your local time automatically. β’ Schedule reminders for calls, deadlines, lessons, streams, and flights β’ Set reminders by βtheir timeβ (for example 9:00 in New York) and avoid mental math β’ Great for distributed teams, freelancers, and international routines OVERLAP PLANNER FOR REMOTE TEAMS DeltaClock is also a meeting planner: it shows overlap windows across multiple time zones so you can pick a time that works for everyone. β’ View overlaps for multiple cities in one planner β’ Build plans from overlap blocks (for example best meeting window, handover time, deep work hours) β’ Share plans as calendar events to keep everyone aligned β’ Perfect for recurring meetings, standups, interviews, and cross border projects WIDGETS: SEE TIME AT A GLANCE Add DeltaClock widgets to your Home Screen for instant time zone visibility: β’ City Time Widget: a stylish widget that shows the current time in your chosen city (great for your key teammate or client location) β’ Project Timeline Widget: a compact view that highlights overlap windows across your project cities so you can spot meeting friendly hours quickly THREE BEAUTIFUL THEMES Choose the look that fits your style: β’ System / Liquid Glass β’ Neumorphic β’ Retro Neumorphic A clean interface makes time zone conversion and scheduling feel effortless. WHO ITβS FOR DeltaClock is made for: β’ Remote work and global teams β’ Managers coordinating schedules across time zones β’ Freelancers with international clients β’ Students attending classes in another country β’ Travelers planning itineraries and check ins β’ Long distance relationships and families WHY DELTACLOCK DeltaClock combines a world clock, time zone converter, widgets, and meeting planner in one focused app: β’ Fast setup: add cities, compare time zones, find overlap β’ Visual timeline: understand time differences at a glance β’ Fewer mistakes: avoid missed meetings caused by DST or date changes β’ Calendar sharing: turn overlaps into real plans β’ Widgets: your key cities and project overlaps always visible Work across time zones with confidence. Compare time zones, plan meetings, and set time zone reminders with DeltaClock. HOW IT WORKS 1. Add the cities you care about (work, home, clients, travel). 2. Use the World Clock timeline to slide into the future or the past. 3. Switch to the Overlap Planner to find shared working hours. 4. Create a plan and export it as a calendar event to share with others. BUILT FOR CLARITY DeltaClock focuses on the most common multi time zone tasks: world clock comparison, time zone conversion, and meeting planning. Instead of doing math, you see the answer: β’ βIs it too late to message London?β β’ βWhen does Sydney start work?β β’ βWhatβs the best meeting time for New York, Berlin, and Tokyo?β β’ βIf the deadline is 17:00 in LA, what time is that for me?β USE IT AS A TIME ZONE CONVERTER Need a quick time zone converter? Scrub to a time in one city and read the matching time in every other city. DeltaClock makes time zone conversion fast, visual, and reliable for daily scheduling. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ONE WATCH
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ONE WATCH shows you the local time, live weather, and the perfect moment to call - for everyone who matters to you. Across iPhone, iPad, Apple Watch, and home-screen widgets. +++ KNOW WHEN TO CALL A traffic-light indicator tells you in one glance: green when it's a good time, orange when it's borderline, red when it's the middle of the night. Set per-contact call windows, weekday availability, and time-zone preferences. +++ PHOTO WIDGETS Add your contacts with their real photo and see them on your home screen and Apple Watch. World clock, but personal. +++ LIVE WEATHER Each contact card shows the current weather at their location, powered by Apple Weather. Useful for travel planning, meeting coordination, or just being a thoughtful friend. +++ APPLE WATCH + COMPLICATIONS Full Apple Watch app with all complication slots β see your people on every watch face. +++ EVENT CONVERTER Plan meetings across time zones. Pick a moment, see what time it is for everyone. +++ 12 LANGUAGES English, German, Spanish, Portuguese, French, Italian, Dutch, Japanese, Korean, Chinese, Hindi, Arabic. +++ LIGHT & DARK MODE Beautifully designed for both β choose your preference or follow the system. +++ PRIVACY FIRST No accounts. No tracking. No analytics. No ads. Contact data stays on your device, never uploaded anywhere. Weather data is fetched via Apple WeatherKit. +++ ONE WATCH PREMIUM Unlock home-screen widgets, Apple Watch app + complications, multiple contact photos, weekday selector, per-contact availability toggle, and analog clock styles. Choose monthly, yearly, or a one-time lifetime purchase. Family Sharing supported. Privacy Policy: https://onewatch.onepage.me/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Made in Austria.
Screenshots
Verdict
DeltaClock and ONE WATCH are too close to call on the numbers: across 6 compared parameters β price, update cadence, ads and in-app purchases among them β neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. DeltaClock sells 3 in-app purchases, starting at $1.99 per month and ONE WATCH sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
DeltaClock ships an update every 4 days, ONE WATCH every 3 days. The most recent releases landed on October 10, 2026 and October 28, 2026 respectively.
| Parameter | DeltaClock | ONE WATCH |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days | Every 3 days β better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch β better |
| Requires iOS | 18.0 | 18.0 |
| Further details β not scored | ||
| Size | 24 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Ameliia Shekikhacheva | Johann Szebeni |
In-app purchases
DeltaClock
- Pro Subscription Monthly$1.991 Month
- Pro Subscription Annual$9.991 Year
- Lifetime purchase$24.99
ONE WATCH
- Premium Monthly$2.991 Month
- Premium Yearly$24.991 Year
- Premium Lifetime$99.99









