One Calendar vs Telescopic
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
One Calendar
Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.
- Integrates multiple calendar providers
- Easy-to-read overview
- Manage appointments and events
- View birthdays
- Cross-platform availability
Read full descriptionHide full description
The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays. OneCalendar is available on all platforms.
Telescopic
Log and verify predictions from any source, building a verifiable record of accuracy over time. This app automatically checks in and updates scores, offering a private way to track your own and others' foresight.
- Log predictions via voice, text, or URL
- Automatic check-ins and outcome verification
- Build a verifiable record of accuracy
- Private by default, no public profiles
- Track your own and others' foresight
Read full descriptionHide full description
Most confident predictions are never followed up on — not yours, and not the people you follow. Telescopic lets you capture them in seconds from a tweet, a URL, or a screenshot, and can automatically verify outcomes when the time comes. Over time you build a real record — of your own calls and the people you follow — and you find out who's actually been right. HOW IT WORKS Capture: The moment you hear or read a prediction, log it by voice, text, or URL. A check-in date will be set automatically, and you're done. Check in: Telescopic notifies you when your check-in date arrives. No manual follow-up needed. Verify: Record what actually happened and attach any supporting evidence. Accuracy scores update automatically. PRIVATE BY DEFAULT No public profiles. No social feed. Your data belongs to you. FREE TO DOWNLOAD Start tracking immediately - no credit card required. TERMS OF USE https://www.telescopic.app/terms
Screenshots
Verdict
The clearest difference is ratings volume: One Calendar at 21K against Telescopic's 2. One Calendar also leads on device support (4 vs 1) and iOS requirement (15.0 vs 17.0). Telescopic's advantage is rating (5.0 vs 4.8) and update cadence (weekly vs fortnightly). On price, 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
Both are free to download. One Calendar sells 1 one-off in-app purchase and Telescopic sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Telescopic holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 2, so its average is the more settled of the two.
One Calendar ships an update fortnightly, Telescopic weekly. The most recent releases landed on October 20, 2026 and October 9, 2026 respectively.
| Parameter | One Calendar | Telescopic |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (21K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 80.7% of reviews | — |
| Number of ratings | 21K — better | 2 |
| Update frequency | Fortnightly | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 89 MB | 12 MB |
| Age rating | 12+ | 4+ |
| Developer | Code Spark | Acavia |
Customer experience
One Calendar
Telescopic
Bugs and requests
One Calendar
Reported bugs
5 issues- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events
Requested features
6 requests- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options
Show 1 moreShow fewer
- Widgets for better visibility
Telescopic
Not enough reviews yet to summarise bugs or requests.
In-app purchases
One Calendar
- OneCalendar premium$5.99
Telescopic
- Pro Monthly$4.991 Month
- Premium Monthly$9.991 Month
Questions
Is One Calendar free?
Is Telescopic free?
Which has better reviews, One Calendar or Telescopic?
Do One Calendar or Telescopic have ads?
Which is updated more often, One Calendar or Telescopic?
Other comparisons
