# Molarity Abacus vs Countdown Widget

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.

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.

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.

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.

## The numbers

| Metric | Molarity Abacus | Countdown Widget |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/molarity-abacus/id915807653/reviews) | **[4.9 (13 ratings)](https://appshunter.io/ios/app/countdown-widget-countful/id6504784186/reviews)** |
| Number of ratings | **15** | 13 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 2 MB | 47 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oak Driven LLC](https://appshunter.io/developer/915807656) | [Khuong Pham](https://appshunter.io/developer/1593197909) |

## What reviewers say

### Molarity Abacus

[App page](https://appshunter.io/ios/app/molarity-abacus/id915807653)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Create and Save Compounds | Free | one-time |


### Countdown Widget

[App page](https://appshunter.io/ios/app/countdown-widget-countful/id6504784186)

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:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $5.99 | per year |
| Discount lifetime access | $3.99 | one-time |
| Lifetime access | $9.99 | one-time |


## Frequently asked 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.

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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.*