Comparison

One Calendar vs Vidsum

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Integrates multiple calendar providers
  • Easy-to-read overview
  • Manage appointments and events
  • View birthdays
  • Cross-platform availability
Features
Read 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.

About

Vidsum

Features
Read full description

Vidsum tells you what's worth your time. Paste a YouTube link — or search right inside the app — and get a structured read of the video in under a minute: chapters you can tap to jump to, the key quotes, a summary, and an honest take on whether the video is actually worth watching. WHAT YOU GET Chapters — the video broken into sections with timestamps. Tap any chapter to jump straight to that moment. The Take — a straight answer to "is this worth my time?" Quotes — the lines that actually matter, with timestamps. Summary — short or in depth, your call. Ask — chat with the video. Ask follow-up questions and get answers grounded in what was actually said. Transcript — a synced, karaoke-style transcript that follows along as the video plays. Tap a line to jump there. BUILT FOR WATCHING, NOT JUST READING Play the video right inside the app while the analysis sits beside it. Rotate to landscape for cinema mode — video on one side, chapters and quotes on the other. Swipe up on the video to read the comments without leaving the screen. QUEUE UP A SESSION Line up several videos and let Vidsum analyse them one after another in the background. Come back to a stack of ready summaries. A broken video never stops the queue. YOUR SUBSCRIPTIONS, SUMMARISED Connect your Google account and Vidsum pulls in the latest uploads from the channels you already follow, so you can triage your feed instead of scrolling it. PRICING Free: 2 hours of analysis per month, videos up to 60 minutes, chapter titles and timestamps unlocked, 5 Ask messages a day. Pro: 120 hours of analysis per month, no video length limit, full analysis unlocked, unlimited Ask with saved history, synced transcript, the queue, and export. Available as a monthly or yearly auto-renewing subscription, with one-off top-up packs if you need more. Payment is charged to your Apple Account at confirmation of purchase. A subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the end of the period. Manage or cancel your subscription in your Apple Account settings after purchase. Terms of Use: https://vidsum.ai/terms Privacy Policy: https://vidsum.ai/privacy Vidsum is an independent app and is not affiliated with, endorsed by, or sponsored by YouTube or Google.

Screenshots

One Calendar4 screens
Vidsum4 screens

Verdict

The call

The clearest difference is update cadence: Vidsum at weekly against One Calendar's fortnightly. One Calendar's advantage is device support (4 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. One Calendar sells 1 one-off in-app purchase and Vidsum sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

One Calendar ships an update fortnightly, Vidsum weekly. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 7 level
One Calendar versus Vidsum: the parameters behind the verdict, then further details
ParameterOne CalendarVidsum
PriceFreeFree
Rating4.8 (21K ratings) — better—
Positive reviews80.7% of reviews—
Number of ratings21K — better—
Update frequencyFortnightlyWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Mac — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size89 MB27 MB
Age rating12+9+
DeveloperCode SparkCloudgeng

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 more
  • Widgets for better visibility

Vidsum

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

One Calendar

One-time1
  • OneCalendar premium$5.99
4 purchases

Vidsum

Subscriptions2
  • Vidsum Pro$9.991 Month
  • Vidsum Pro$99.991 Year
One-time2
  • Boost Pack — 15 hours$4.99
  • Boost Pack — 30 hours$7.99

Questions

Is One Calendar free?
One Calendar is free to download, with in-app purchases available.
Is Vidsum free?
Vidsum is free to download, with in-app purchases available.
Do One Calendar or Vidsum have ads?
Neither One Calendar nor Vidsum shows ads.
Which is updated more often, One Calendar or Vidsum?
One Calendar ships an update fortnightly, and Vidsum weekly. Most recently, One Calendar was updated on October 30, 2026 and Vidsum on October 28, 2026.

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