# FuelMizer vs Countdown 321

The clearest difference is in-app purchases: FuelMizer at none against Countdown 321's 4. FuelMizer also leads on iOS requirement (13.0 vs 18.6). Countdown 321's advantage is update cadence (every 5 months vs every 27 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Countdown 321 sells 4 one-off in-app purchases. FuelMizer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for FuelMizer against 5.0 for Countdown 321. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

FuelMizer ships an update every 27 months, Countdown 321 every 5 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | FuelMizer | Countdown 321 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/fuelmizer/id1550669490/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/countdown-321/id6499282435/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 2 MB | 61 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [LocoDog Design LLC](https://appshunter.io/developer/1131466723) | [Later Creative LLC](https://appshunter.io/developer/1444959285) |

## What reviewers say

### FuelMizer

[App page](https://appshunter.io/ios/app/fuelmizer/id1550669490)

Accurately measure the fuel level in partially used canisters and estimate the number of meals you can prepare with the remaining fuel. Utilizes a standard kitchen scale and offers preloaded data for common brands and stoves, with the ability to add custom entries.

**Highlights:** Accurate fuel level measurement, Estimate meals from remaining fuel, Supports common brands and sizes, Add custom canister and stove data, Utilizes a standard kitchen scale

**Features:** macOS Compatibility

**In-app purchases:** none


### Countdown 321

[App page](https://appshunter.io/ios/app/countdown-321/id6499282435)

Track time until future events or elapsed time since past milestones. Customize with personal photos and colors, and share your countdowns as images. Receive notifications for important dates and import birthdays automatically.

**Highlights:** Countdown and count-up tracking, Customizable widgets for home and lock screens, Personalized backgrounds and styles, Event notifications and milestone alerts, Birthday import from contacts, Shareable countdown images

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bread-sized tip | $1.99 | one-time |
| Full Version | $2.99 | one-time |
| Peanut Butter-Sized Tip | $2.99 | one-time |
| Jam-Sized Tip | $3.99 | one-time |


## Frequently asked questions

### Is FuelMizer free?

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

### Is Countdown 321 free?

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

### Which has better reviews, FuelMizer or Countdown 321?

FuelMizer and Countdown 321 are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do FuelMizer or Countdown 321 have ads?

Neither FuelMizer nor Countdown 321 shows ads.

### Which is updated more often, FuelMizer or Countdown 321?

FuelMizer ships an update every 27 months, and Countdown 321 every 5 months. Most recently, FuelMizer was updated on November 3, 2026 and Countdown 321 on November 4, 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.*