# FirstSeed Calendar vs Knock Reminder

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.

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.

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.

## The numbers

| Metric | FirstSeed Calendar | Knock Reminder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (342 ratings)](https://appshunter.io/ios/app/firstseed-calendar/id1321260278/reviews)** | — |
| Number of ratings | **342** | — |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 67 MB | 34 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [FirstSeed Inc](https://appshunter.io/developer/1321260277) | [Seki Hiroyasu](https://appshunter.io/developer/6792599749) |

## What reviewers say

### FirstSeed Calendar

[App page](https://appshunter.io/ios/app/firstseed-calendar/id1321260278)

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:** Family Sharing, Apple Watch app, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Donation | $2.99 | per month |
| Pro Version | $9.99 | one-time |


### Knock Reminder

[App page](https://appshunter.io/ios/app/knock-reminder/id6794741120)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knock Reminder Pro | $2.99 | one-time |


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*