OffOf vs Overlap
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OffOf
This app simplifies percentage calculations for shopping discounts and finding a percentage of a number. It offers a clean interface with satisfying sound and haptic feedback for a delightful user experience.
- Calculate percentage OFF
- Calculate percentage OF
- Shopping discount calculations
- Mechanical keyboard sounds
- Haptic feedback
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A beautiful percentage calculator. OffOf helps you calculate to percentage OFF of a particular number, and the percentage OF a particular number. OffOf is NOT a full calculator. Your device already comes with a great calculator. OffOf is a Percentage Calculator ONLY. • 35% OFF Instantly know how much you're going to spend while shopping. What is the cost of that $18.99 t-shirt when its 35% off? OffOf makes it easy to calculate. Simply enter 35% as the "Percentage" and 18.99 as the "Amount" and OffOf will show you how much you'll be spending after the discount. • 16% OF What is 16% of 2,458? OffOf will get you that answer instantly. Just enter 16% as the "Percentage" and 2,458 as the "Amount" and you'll know right away. • Real, satisfying mechanical keyboard sounds • Delightful haptic feedback on button presses and more
Overlap
Easily find optimal meeting times across different time zones with a visual graph. Set custom availability for each location and sync with your calendar to avoid scheduling conflicts. Share convenient times directly from the app.
- Visual Overlap Graph for meeting times
- Customizable availability hours per time zone
- Calendar event integration
- Multiple time zone display
- Time zone renaming
- Lock Screen Standby Mode widget
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Find the perfect time to catchup across multiple time zones without the mind-bending math. Overlap is a smart world clock that helps you connect with people in different time zones. It makes it simple to see the time in multiple places at once, and its fun Overlap Graph is a unique visual way to quickly find convenient meeting times across the world. You can choose ‘available’ hours for each time zone. For example Dan in London might be available from 2pm to 5pm and Rashida in Sydney might be available from 7am to midday. Bring up the Overlap Graph and it will magically show you the most compatible times to schedule your catchup. Overlap also displays your calendar events, so you can always find a time that suits your schedule. Available on iPhone, iPad and Mac. • You can see multiple time zones in one beautiful UI • You can swipe left and right to quickly move through time. • You can customize 'availability' for each timezone - this could mean office hours for a meeting or simply when you're available for a group chat with your far-flung family -no more 'Sorry that's 3am for me!' • You can rename each time zone; for example, you might simply rename a time zone to say 'Grandma' or the name of a client you work with. Or perhaps your Grandma is your client, no judgement here. • You can hide time zones that you don’t need right now so it’s always easy to focus on what you need to know. • You can show your calendar events so you can always choose a time that fits your schedule. • Once you’ve chosen a great time its easy to share it via your favorite messaging app or create a calendar event. • Standby Mode is a Lock Screen feature that activates automatically when your iPhone is charging in landscape mode. The Overlap widget fully supports this mode!
Screenshots
Verdict
The clearest difference is price: Overlap at Free against OffOf's $0.99. Overlap also leads on update cadence (every 3 months vs every 59 months) and ratings volume (849 vs 11). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Overlap is free to download; OffOf costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Overlap holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Overlap has 849 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 61% of OffOf's written reviews are positive against 67% of Overlap's.
OffOf ships an update every 59 months, Overlap every 3 months. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.
| Parameter | OffOf | Overlap |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.6 (11 ratings) | 4.8 (849 ratings) — better |
| Positive reviews | 60.7% of reviews | 67.2% of reviews — better |
| Number of ratings | 11 | 849 — better |
| Update frequency | Every 59 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Mac, Apple Watch, Vision Pro — better | iPhone, iPad, iPod, Mac |
| Requires iOS | 17.2 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Daeo Corp. Software | Bonobo |
Customer experience
OffOf
Overlap
User reviews
OffOf
From 11 App Store ratingsWhat we love
- ✨ Gorgeous design
- 👍 Simple and useful utility
- 💯 Best percentage calculator
- ✅ Does what it says
- 💡 Beautifully minimalist
Room to improve
- ❌ Not updated
- ⚠️ Abandoned app
- 📉 No longer works
- 💔 Incompatible with iOS
- ⏳ Outdated
Overlap
From 849 App Store ratingsWhat we love
- 💡 Elegant and intuitive interface
- 🚀 Helpful for coordinating meetings across time zones
- 👍 Useful for tracking time differences globally
- 👍 Simple and easy to use
- 👍 Beautiful and sleek design
Room to improve
- 🐛 Widget not working
- 🐛 Timezone data not always accurate
- 🐛 Duplicate timezone entries
- 🐛 App crashes and freezes
- 🔋 High CPU usage on Mac
Bugs and requests
OffOf
Reported bugs
3 issues- Not compatible with new iOS updates
- App no longer opens/works
- Freezes and force closes
Requested features
5 requests- Make it a fully functional calculator
- Update to new software/iOS versions
- Show final price after discount
- Auto clear fields on tap
- Update for X screens
Overlap
Reported bugs
4 issues- Timezone data not updating correctly
- Inability to delete unwanted timezones
- Inconsistent behavior across platforms
- Typing issues on Mac version
Requested features
5 requests- Add option to reorder timezones
- Implement 24-hour clock display
- Allow customization of colors and backgrounds
- Integrate with calendar for scheduling
- Add weather information for each timezone
In-app purchases
OffOf
No in-app purchases
Overlap
No in-app purchases









