Cal Countdown vs Gapper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cal Countdown
This app automatically displays a color-coded countdown to your next calendar event. It's designed for quick glances on your Apple Watch face or iPhone "Today" screen, helping you manage your schedule efficiently without manual calculations.
- Automatic countdown to next calendar event
- Color-coded urgency indicators
- Apple Watch complication support
- iPhone "Today" widget
- Calendar data integration
- Option to skip specific events
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"Cal Countdown" is a free, simple iOS & Apple Watch app that automatically creates a color-coded countdown to the next event on your calendar and displays it on your Apple Watch face and/or your "Today" screen. The app is primarily intended to be used as a complication on your Apple Watch or as a widget. If your days are anything like ours, packed with various meetings scattered throughout the day, every time you check your calendar, you're trying to figure out one thing: How much time do I have until my next appointment? So, you glance at your watch, note the start time of your next appointment, and calculate the difference between the current time and your next event. We got tired of doing this mental calculation many times a day, but much to our surprise, we could not find an existing iOS application that would do this chore for us. So we decided to build it ourselves. Now, every time we glance at our watch, it immediately tells us what we want to know: How much time do I have until my next appointment? The app's color changes from blue to green to yellow to orange to red as you approach the start of your next event. (6+ hours = Blue, 2-6 hours = Green, 1-2 = Yellow, 30-60 mins = Orange, 0-30 mins = Red) Cal Countdown supports all the different Apple Watch complications. All Apple Watch complications that support multi-color will be color-coded (but not all watch complications support multiple colors.) Using "Cal Countdown" is as easy as it gets. It uses the calendar data already on your phone; no signing in; no entering any usernames or passwords. The app lets you select the calendars you want to include or not in your calendar countdowns. Don't have an Apple Watch? You can still use Cal Countdown on your phone as an iPhone/iPad app with a "Today" widget. Cal Countdown does not require an account. It does not even require an internet connection. The app uses the calendar data already on your iPhone. It's completely secure. Your calendar data remains completely private, and never leaves your phone. Cal Countdown also has the ability to ignore or skip certain events on your calendar. This feature is especially useful if you have shared calendars with your family, friends, or colleagues. We often have events on our calendars that we need to know about, but may not be attending ourselves. If you want Cal Countdown to ignore or skip these events and start counting down to the following event on your calendar, just tap the "Ignore" button, and Cal Countdown will immediately start a countdown to the following event.
Gapper
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Gapper scans your calendar and finds every free window between your meetings — then suggests the right activity to fill it, based on how long the gap is and how you're feeling right now. WHAT GAPPER DOES: Every day is full of hidden time. The 20 minutes before your afternoon call. The gap between your morning standup and lunch. Gapper surfaces these windows automatically and turns them into opportunities. HOW IT WORKS: 1. Connect your calendar (Apple) 2. Gapper detects free gaps within your work hours 3. Browse activity suggestions matched to each gap's length and your energy level 4. Tap to schedule — it appears on your timeline instantly SMART SUGGESTIONS: Gapper considers three things when suggesting activities: · Gap length — a 5-minute gap gets a breathing exercise, not a 30-minute workout · Your energy level — low energy? We'll suggest a podcast. High energy? Let's move. · Your preferences — enable only the categories you care about ACTIVITY CATEGORIES: · Health — stretching, breathing, quick workouts, meditation · Learning — reading, flashcards, language practice, podcasts · Productivity — journaling, planning, email cleanup, quick reviews You can also add your own custom activities with your preferred duration and energy level. YOUR TIME, YOUR RULES: Set your own work hours so Gapper only looks for gaps between, say, 9 AM and 6 PM — never suggesting you fill time at midnight. WEEKLY STATS: See how much time you reclaimed each week, your current streak, and a breakdown by category. Small wins add up. PRIVACY FIRST: Everything stays on your device. No account required. No data collected. Your calendar data never leaves your phone.
Screenshots
Verdict
The clearest difference is in-app purchases: Cal Countdown at none against Gapper's 1. Cal Countdown also leads on ads (none vs shown). Gapper's advantage is update cadence (every 5 days vs every 8 months). On price, device support and iOS requirement 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
Both are free to download. Gapper sells 1 one-off in-app purchase. Cal Countdown asks for nothing beyond the download.
Cal Countdown ships an update every 8 months, Gapper every 5 days. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.
| Parameter | Cal Countdown | Gapper |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (21 ratings) — better | — |
| Positive reviews | 94.7% of reviews | — |
| Number of ratings | 21 — better | — |
| Update frequency | Every 8 months | Every 5 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 17.6 — better | 18.2 |
| Further details — not scored | ||
| Size | 7 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Franck Reyherme | CHING-HAO FAN |
In-app purchases
Cal Countdown
No in-app purchases
Gapper
- Gapper Pro Unlock$0.99









