CalendarRef vs Teller1
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalendarRef
This app provides a fast, minimalist calendar reference for quickly finding the day of the week for any date. It offers full-year and monthly views with clean layouts, supporting BCE/CE years and accurate historical calendar conversions. It works offline without ads or tracking.
- Full-year view
- Monthly layouts
- Instant year navigation
- BCE/CE year support
- Julian/Gregorian calendar handling
- Optional date highlights
- Offline functionality
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CalendarRef is a fast, minimalist calendar reference app for quickly determining the day of the week for any date. View an entire year at once, or scroll clean, readable monthly layouts without clutter or distractions. CalendarRef is built for speed, accuracy, and clarity whether you’re planning ahead, checking a historical date, or simply verifying a date. Features: • Full-year view showing all 12 months at a glance • Modern and retro (terminal-style) monthly views • Instant year navigation with scrollable digit selection • Support for BCE and CE years • Accurate Julian → Gregorian calendar handling, including the 1582 reform • Optional highlights for Friday the 13th, leap days, and custom dates • Works fully offline — no accounts, no tracking, no ads CalendarRef is a focused utility for people who care about dates, history, and precision.
Teller1
Create visually stunning countdowns for any event, complete with dynamic backgrounds and celebratory animations. Track progress in days, hours, minutes, and seconds, and share moments with others. Integrates with Siri and your calendar for easy setup.
- Dynamic event-specific backgrounds
- Detailed progress tracking (days, hours, minutes, seconds)
- Celebratory animations and haptic feedback
- Home screen widgets and Dynamic Island integration
- Shared countdowns via iCloud
- Siri and calendar import
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Some dates deserve more than a calendar entry. Countdown turns the moments you can't wait for into living, glowing timers with a proper celebration when they finally arrive. BACKGROUNDS THAT GET IT • The background matches your event: type "Ibiza Trip" and the app finds real imagery of the place, tinted by its live time of day. • Or pick any photo from your library. • Hand-tuned themes: Aurora, Sunset, Neon Noir, Midnight Gold and more. COUNT EVERY SECOND • Glowing progress ring with days, hours, minutes, seconds. • The last 10 seconds go full-screen cinematic with a haptic heartbeat. • Confetti storm and celebration screen at zero. • Anticipation stats: sleeps left, weekends left, how far you've come. EVERYWHERE YOU LOOK • Home screen widgets in three styles: Ring, Flip Clock, Minimal. • Live Activity in the Dynamic Island for the final 24 hours. • Ambient nightstand mode. • Notifications at the moment itself, plus halfway, 30-day, 1-week and 1-day milestones. SHARED MOMENTS • Share a countdown via iCloud and count down together. • See the moment across world time zones. • Finished countdowns become keepsakes: add photos, count the days since. QUICK TO ADD • Siri: "Add a countdown" • Import straight from your calendar • Paste any text, "flight to Lisbon Aug 14 6am" becomes a countdown. Free. No ads. No tracking. Your data stays yours.
Screenshots
Verdict
CalendarRef and Teller1 are too close to call on the numbers: across 8 compared parameters — price, rating, ratings volume and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for CalendarRef against 5.0 for Teller1. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
| Parameter | CalendarRef | Teller1 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Number of ratings | 1 | 2 — better |
| Update frequency | — | Every 4 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.5 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Derrick Braga | This is GroundBreaking B.V. |
Customer experience
CalendarRef
Teller1
In-app purchases
CalendarRef
No in-app purchases
Teller1
No in-app purchases









