Comparison

FuelMizer vs Countdown 321

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

Head to head
About

FuelMizer

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
Read full description

Now you can accurately measure the fuel level of any partially used canister with Fuel Mizer. You can also estimate how many meals you can make with that remaining fuel. All you need is a standard kitchen scale! Preloaded with data for many common brands and sizes of canisters and many common backpacking stoves. You can also add and edit custom canister and stove data.

About

Countdown 321

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
Read full description

Make Every Moment Count Whether you’re counting down to something exciting or remembering something special, Countdown 321 helps you celebrate every moment, big or small One-Time Purchase. No Subscriptions. No Surprises. ----- Countdown or Count-Up ----- Track the time left until your next big event - or how long it’s been since a meaningful moment. ----- Gorgeous widgets, everywhere ----- View countdowns within the app, or add stunning countdowns to your home screen, lock screen, and standby mode, with customizable widgets in 3 different sizes ----- Make it yours ----- * Choose custom background colors or use your own photos - Pick from multiple unique styles to match your mood or the moment - Share countdowns as beautiful images ready for social media ----- Smarter Celebrations ----- - Set countdowns to repeat every week, month, year, or even every few years - Get notifications for upcoming events and special milestones - Import birthdays from your Contacts automatically ----- Celebrate Together ----- - Share countdowns with friends and family - Keep track of shared milestones together - Share countdowns instantly to your favorite social media as images Whether it’s a birthday, a concert, a trip, an anniversary, or something just for you, Countdown 321 makes tracking time feel meaningful, fun, and completely yours No subscriptions. No ads. Just one purchase for everything.

Screenshots

FuelMizer4 screens
Countdown 3213 screens

Verdict

The call

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.

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
FuelMizer versus Countdown 321: the parameters behind the verdict, then further details
ParameterFuelMizerCountdown 321
PriceFreeFree
Rating5.0 (3 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews—
Number of ratings3 — better2
Update frequencyEvery 27 monthsEvery 5 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better18.6
Further details — not scored
Size2 MB61 MB
Age rating4+4+
DeveloperLocoDog Design LLCLater Creative LLC

Customer experience

FuelMizer

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Countdown 321

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

FuelMizer

No in-app purchases

4 purchases

Countdown 321

One-time4
  • Bread-sized tip$1.99
  • Full Version$2.99
  • Peanut Butter-Sized Tip$2.99
Show 1 more
  • Jam-Sized Tip$3.99

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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