Comparison

Molarity Abacus vs Countdown Widget

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

Head to head
About

Molarity Abacus

Easily calculate molarity, solution volume, solute mass, or molecular weight by inputting any three variables. Customize units and access pre-configured strong acids and bases. An in-app purchase allows for creating and storing custom compounds.

Highlights
  • Molarity calculation
  • Solute mass calculation
  • Total solution volume calculation
  • Molecular weight calculation
  • Customizable units
  • Pre-configured compounds
  • Create and store custom compounds
Features
Read full description

- Easily calculate Molarity, Total Solution Volume, Solute Mass, or Molecular Weight. - Simply input three of the four variables and the fourth is calculated automatically. - The units can be changed for Total Solution Volume, Solute Mass, or Molecular Weight. - In-App purchase available to create and store compounds for quick access. The Molarity Abacus is a simple and easy way to do molarity calculations. Simply input any three of the four variables and the fourth will be instantly calculated. Includes full help documentation on each screen. The seven strong acids and eight strong bases are pre-configured in the app and can be selected from a list of compounds. With an In-App purchase, you gain even more functionality allowing you to create and store compounds for repeated use. You name the compound, select the elements in it, set the number of atoms for each element, and the molecular weight is calculated automatically. The full periodic table is included and has been loaded with molecular weights and checked against publicly available sources on the internet. The element weights can be edited. This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (http://www.openssl.org/)

About

Countdown Widget

This app helps you track important dates like birthdays and anniversaries by displaying countdowns directly on your Home Screen. It offers customizable reminders, the ability to count up from milestones, and iCloud synchronization across devices.

Highlights
  • Home Screen countdown widgets
  • Customizable reminders
  • Repeating event tracking
  • Count up from milestones
  • Personalized event themes
  • Calendar import
  • iCloud sync
Features
Read full description

Never miss the dates that matter. Birthdays, anniversaries, trips and deadlines have a way of sneaking up on you. Countful keeps every important date right on your Home Screen, counting down the days so you always have time to prepare. WHY PEOPLE LOVE COUNTFUL • Countdown widgets: See days, hours and minutes left on your Home Screen, Lock Screen and StandBy. No need to open the app. • Reminders that arrive in time: Get notified days, hours or minutes before the big day. Snooze any reminder for an hour with one tap. • Repeating events: Birthdays and anniversaries repeat every year automatically, and your reminders keep coming every time. • Count up too: Track days since a milestone, a habit or a special moment. • Make it yours: Add your own photo, pick a gradient, a pattern and an emoji for every event. • Import from Calendar: Bring in the dates you already have instead of typing them by hand. • Tags and search: Group events by tag and find anything in seconds. • Archive: Hide past or paused events without losing them. Archived events stay quiet until you bring them back. • iCloud sync: Your countdowns stay up to date on all your devices. PERFECT FOR Birthdays, anniversaries, weddings, vacations, trips, holidays, Christmas, New Year, exams, deadlines, due dates, concerts and every day you're looking forward to. COUNTFUL PRO Unlock unlimited events, Calendar import and every widget style with a monthly, yearly or one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. Terms of Use: https://indiegoodies.com/countdown/terms Privacy Policy: https://indiegoodies.com/countdown/privacy

Screenshots

Molarity Abacus4 screens
Countdown Widget4 screens

Verdict

The call

The clearest difference is rating: Countdown Widget at 4.9 against Molarity Abacus's 4.5. Countdown Widget also leads on update cadence (every 11 days vs every 12 months). Molarity Abacus's advantage is review sentiment (100% vs 86%) and iOS requirement (8.0 vs 17.0). On price, ratings volume, ads and in-app purchases 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. Molarity Abacus sells 1 one-off in-app purchase and Countdown Widget sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Countdown Widget holds the better App Store score, 4.9 against 4.5. Both are backed by a comparable volume of ratings — 15 and 13 respectively. Written reviews complicate that: 100% of Molarity Abacus's written reviews are positive against 86% of Countdown Widget's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Molarity Abacus ships an update every 12 months, Countdown Widget every 11 days. The most recent releases landed on November 1, 2026 and November 8, 2026 respectively.

Scorecard4 real differences · 6 level
Molarity Abacus versus Countdown Widget: the parameters behind the verdict, then further details
ParameterMolarity AbacusCountdown Widget
PriceFreeFree
Rating4.5 (15 ratings)4.9 (13 ratings) — better
Positive reviews100.0% of reviews — better85.7% of reviews
Number of ratings15 — better13
Update frequencyEvery 12 monthsEvery 11 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPod — betteriPhone
Requires iOS8.0 — better17.0
Further details — not scored
Size2 MB30 MB
Age rating4+4+
DeveloperOak Driven LLCKhuong Pham

Customer experience

Molarity Abacus

All ratings15 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Countdown Widget

All ratings13 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

In-app purchases

1 purchases

Molarity Abacus

One-time1
  • Create and Save CompoundsFree
4 purchases

Countdown Widget

Subscriptions2
  • Monthly$0.991 Month
  • Yearly$5.991 Year
One-time2
  • Discount lifetime access$3.99
  • Lifetime access$9.99

Questions

Is Molarity Abacus free?
Molarity Abacus is free to download, with in-app purchases available.
Is Countdown Widget free?
Countdown Widget is free to download, with in-app purchases available.
Which has better reviews, Molarity Abacus or Countdown Widget?
Countdown Widget is rated higher. Molarity Abacus averages 4.5 out of 5 from 15 ratings, while Countdown Widget averages 4.9 from 13 ratings.
Do Molarity Abacus or Countdown Widget have ads?
Neither Molarity Abacus nor Countdown Widget shows ads.
Which is updated more often, Molarity Abacus or Countdown Widget?
Molarity Abacus ships an update every 12 months, and Countdown Widget every 11 days. Most recently, Molarity Abacus was updated on November 1, 2026 and Countdown Widget on November 8, 2026.

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