# 321 Countdown vs Dday Planner

The clearest difference is in-app purchases: Dday Planner at none against 321 Countdown's 1. 321 Countdown's advantage is update cadence (daily vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 321 Countdown sells 1 one-off in-app purchase. Dday Planner asks for nothing beyond the download.

321 Countdown ships an update daily, Dday Planner every 4 months. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 321 Countdown | Dday Planner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/321-countdown/id1506518580/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 4 months |
| Monetization | Free | — |
| Size | 38 MB | 45 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Luis Haitzer](https://appshunter.io/developer/1517692760) | [bridgestep](https://appshunter.io/developer/1831217490) |

## What reviewers say

### 321 Countdown

[App page](https://appshunter.io/ios/app/321-countdown/id1506518580)

Easily track time until important events with custom units and backgrounds. Set reminders and organize upcoming occasions with an intuitive design. Enjoy unlimited countdowns and recurring events without any ads or in-app purchases.

**Highlights:** Unlimited simultaneous countdowns, Recurring events, Individual backgrounds, Reminders for approaching occurrences, Dark mode, Conversions into unique units

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support development | $2.99 | one-time |


### Dday Planner

[App page](https://appshunter.io/ios/app/dday-planner/id6756297265)

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

**In-app purchases:** none


## Frequently asked questions

### Is 321 Countdown free?

321 Countdown is free to download, with in-app purchases available.

### Is Dday Planner free?

Dday Planner is free to download, with no in-app purchases.

### Do 321 Countdown or Dday Planner have ads?

Neither 321 Countdown nor Dday Planner shows ads.

### Which is updated more often, 321 Countdown or Dday Planner?

321 Countdown ships an update daily, and Dday Planner every 4 months. Most recently, 321 Countdown was updated on October 4, 2026 and Dday Planner on October 2, 2026.

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