Comparison

FirstSeed Calendar vs Knock Reminder

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

Head to head
About

FirstSeed Calendar

A powerful scheduling app that manages both events and reminders. It offers innovative calendar views, interactive widgets for various iOS versions, and seamless syncing with Apple's Calendar and Reminders apps. An optional paid upgrade unlocks advanced features like natural language event processing and drag-and-drop functionality.

Highlights
  • Interactive and lock-screen widgets
  • Full-featured month, week, and list views
  • Event and reminder management
  • Natural language event processing (paid)
  • Drag & drop event manipulation (paid)
  • Apple Watch support
  • Syncs with Apple Calendar and Reminders
Features
Read full description

FirstSeed Calendar keeps your events and reminders in one place. It’s fast, flexible, and built so you can handle most tasks with one hand. Features: - Month view that handles everyday tasks with one hand - Week view that fits the whole week on one screen, with no vertical scrolling - Day, list, and year views, including a list view laid out like a paper planner - Events and reminders together in one calendar - Move or duplicate events to multiple dates at once - Respond to invitations right from the app - Daily Summary notifications for today’s or tomorrow’s events - Home Screen, Lock Screen, StandBy, and interactive widgets, including a timeline widget - Control Center controls - Apple Watch app with complications - Dark mode, custom themes, and colors for weekends and holidays - Designed for Liquid Glass, with clear and tinted icons and widgets Pro: One-Time Purchase, No Subscription: - Sync directly with Google Calendar, including per-event colors - Trash: recover deleted events and reminders for up to 30 days - Automatic backups of your calendar data - Quick Event: create events by typing naturally, like “Lunch with Bob at noon tomorrow” - Full-screen alarms for events you can’t miss - Weather forecasts in your calendar - Week numbers, time zones, and event history - Drag and drop to reschedule events - Templates for events you create often - Calendar sets to show or hide groups of calendars with one tap - Import and export ICS files - Customize the Apple Watch app - Alternate app icons - No ads Sync: FirstSeed Calendar works with Apple’s Calendar and Reminders apps, so your events and reminders stay in sync across all your devices through iCloud, Google, Exchange, and any other accounts you’ve added in Settings.

About

Knock Reminder

Features
Read full description

In a meeting, you think "let me send that in 15 minutes" — but you don't have time for a multi-tap setup, so you set nothing and actually forget. The stock Reminders app takes four steps: open → tap + → pick a list → enter date and time. It's quietly long. And the notification gets buried with everything else — next thing you know, an hour's gone by. Knock Reminder exists to kill both of those: the hassle of setting a reminder, and the pain of missing it. For you if: You tend to say "later" and never actually set anything because the standard app is too much friction. Or you've been burned by missing a notification before. What it does: Pick from your own 16 custom presets and set a reminder in 3 taps. Repeats cover daily, weekly, monthly, yearly — weekly lets you toggle individual weekdays, so "just Monday, Wednesday, Friday" is one setting. Tap the notification and it switches instantly to a full-screen alert in your theme color — big clock, big name. No more losing it in the banner pile. Done, +15 min, or +1 hour, right there. We cut the seconds it takes to set one.

Screenshots

FirstSeed Calendar4 screens
Knock Reminder4 screens

Verdict

The call

The clearest difference is ads: Knock Reminder at none against FirstSeed Calendar's shown. Knock Reminder also leads on iOS requirement (17.0 vs 26.0). FirstSeed Calendar's advantage is update cadence (every 8 days vs every 2 months) and device support (3 vs 1). On price 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. FirstSeed Calendar sells 2 in-app purchases, starting at $2.99 per month and Knock Reminder sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

FirstSeed Calendar ships an update every 8 days, Knock Reminder every 2 months. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
FirstSeed Calendar versus Knock Reminder: the parameters behind the verdict, then further details
ParameterFirstSeed CalendarKnock Reminder
PriceFreeFree
Rating4.7 (342 ratings) — better—
Positive reviews80.6% of reviews—
Number of ratings342 — better—
Update frequencyEvery 8 days — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS26.017.0 — better
Further details — not scored
Size67 MB34 MB
Age rating4+4+
DeveloperFirstSeed IncSeki Hiroyasu

In-app purchases

2 purchases

FirstSeed Calendar

Subscriptions1
  • Monthly Donation$2.991 Month
One-time1
  • Pro Version$9.99
1 purchases

Knock Reminder

One-time1
  • Knock Reminder Pro$2.99

Questions

Is FirstSeed Calendar free?
FirstSeed Calendar is free to download, with in-app purchases available.
Is Knock Reminder free?
Knock Reminder is free to download, with in-app purchases available.
Do FirstSeed Calendar or Knock Reminder have ads?
FirstSeed Calendar shows ads; Knock Reminder does not.
Which is updated more often, FirstSeed Calendar or Knock Reminder?
FirstSeed Calendar ships an update every 8 days, and Knock Reminder every 2 months. Most recently, FirstSeed Calendar was updated on November 11, 2026 and Knock Reminder on October 31, 2026.

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