Comparison

Calculator83 vs Calm Countdown Timer

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

Head to head
About

Calculator83

A minimalist calculator app focused on simplicity and a clean workflow. It offers both basic and scientific modes, allowing users to perform calculations without complex settings. Get started quickly with this straightforward tool.

Highlights
  • Minimalist design
  • Clean workflow
  • Basic mode
  • Scientific mode
  • Easy to use
Features
Read full description

Calculator83 is a minimalist calculator designed with simplicity to the core and an emphasis on a clean workflow. Be up and running in seconds! Featuring two modes of operation, basic and scientific. The goal of this app is to allow users to have a powerful calculator without the fuss of learning all the settings of a powerful calculator.

About

Calm Countdown Timer

This app provides a simple, calming visual timer to help children understand time, improve focus, and manage transitions smoothly. Its friendly design and clear countdown display make routines predictable and less stressful for kids, including those with special needs.

Highlights
  • Visual countdown display
  • Friendly characters
  • One-tap presets
  • Distraction-free design
  • Supports children with ADHD/autism
  • Helps with transitions and routines
Read full description

Calm Countdown Timer is a simple, calming visual timer designed to help kids understand time, stay focused, and transition between activities with less stress. With bright visuals, friendly characters, and a clear countdown display, kids can see time passing instead of guessing, making routines feel more predictable and manageable. Completely free. No distractions. No ads No in-app purchases No subscriptions No hidden costs Just a clean, reliable timer you can trust your kids to use. Why parents and kids love it Visual countdown makes time easy to understand Simple one-tap presets for quick use Calm, friendly design with engaging characters Helps reduce resistance during transitions Encourages independence and routine-building Helpful for different needs Visual timers are commonly used to support children with ADHD, autism, and sensory processing differences by making time more predictable and reducing overwhelm. Calm Countdown Timer provides a gentle, distraction-free way to support focus, transitions, and daily structure. Perfect for everyday moments Getting ready in the morning Homework or focus time Screen time limits Bedtime routines Playtime and breaks Designed with simplicity in mind No clutter. No unnecessary features. Just a calm, easy-to-use timer that works instantly when you need it.

Screenshots

Calculator833 screens
Calm Countdown Timer3 screens

Verdict

The call

The clearest difference is update cadence: Calm Countdown Timer at weekly against Calculator83's every 20 months. Calculator83's advantage is iOS requirement (15.0 vs 17.6). 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Calculator83 against 5.0 for Calm Countdown Timer. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

UpkeepUpdate frequency

Calculator83 ships an update every 20 months, Calm Countdown Timer weekly. The most recent releases landed on September 15, 2026 and September 6, 2026 respectively.

Scorecard2 real differences · 8 level
Calculator83 versus Calm Countdown Timer: the parameters behind the verdict, then further details
ParameterCalculator83Calm Countdown Timer
PriceFreeFree
Rating5.0 (4 ratings)5.0 (2 ratings)
Positive reviews62.5% of reviews—
Number of ratings4 — better2
Update frequencyEvery 20 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.6
Further details — not scored
Size10 MB15 MB
Age rating4+4+
DeveloperLyker Labs LLCShujaat Siddiqui

In-app purchases

None

Calculator83

No in-app purchases

None

Calm Countdown Timer

No in-app purchases

Questions

Is Calculator83 free?
Calculator83 is free to download, with no in-app purchases.
Is Calm Countdown Timer free?
Calm Countdown Timer is free to download, with no in-app purchases.
Which has better reviews, Calculator83 or Calm Countdown Timer?
Calculator83 and Calm Countdown Timer are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.
Do Calculator83 or Calm Countdown Timer have ads?
Neither Calculator83 nor Calm Countdown Timer shows ads.
Which is updated more often, Calculator83 or Calm Countdown Timer?
Calculator83 ships an update every 20 months, and Calm Countdown Timer weekly. Most recently, Calculator83 was updated on September 15, 2026 and Calm Countdown Timer on September 6, 2026.

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