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

Easily create and track countdowns for all your important events with customizable reminders and widgets. Organize events with tags and personalize them with unique designs to stay on top of your schedule.

Highlights
  • Event countdowns (days, hours, minutes)
  • Repeat event tracking
  • Home screen widgets
  • Customizable event cards
  • Customizable reminders
  • Tag filtering for organization
Features
Read full description

Countdown Widget: Countful is the ultimate event reminder and tracker designed to help you stay organized and never miss a moment. Easily create countdowns for all your important events—from birthdays to holidays—and customize them to match your style. Add repeat events to automatically track daily, weekly, monthly, or yearly events. Set custom reminders to notify you before the event based on your preferred time, ensuring you’re always prepared. With tags, you can categorize and filter events by tag or name, making it simple to find and manage your events. Key features: • Event countdown: Track days, hours, and minutes until your upcoming events. • Repeat events: Automatically track repeating events on a daily, weekly, or yearly basis. • Widgets: Add countdowns to your home screen for quick access to upcoming events. • Customizable event cards: Personalize each event with stunning gradients or custom images. • Custom reminders: Set notifications before an event with flexible reminder settings. • Tag filtering: Organize events by tags or names for easy filtering and management. Stay on top of your schedule with Countdown Widget: Countful—your all-in-one tool for tracking and managing important events! For more information, visit https://indiegoodies.com/countdown 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 5 days vs every 12 months). Molarity Abacus's advantage is iOS requirement (8.0 vs 17.0). On price, review sentiment, 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. 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 split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Molarity Abacus ships an update every 12 months, Countdown Widget every 5 days. The most recent releases landed on September 20, 2026 and June 3, 2026 respectively.

Scorecard3 real differences · 7 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 reviews100.0% of reviews
Number of ratings15 — better13
Update frequencyEvery 12 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPod — betteriPhone
Requires iOS8.0 — better17.0
Further details — not scored
Size2 MB47 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 reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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 5 days. Most recently, Molarity Abacus was updated on September 20, 2026 and Countdown Widget on June 3, 2026.

Other comparisons