# Calc Engine vs Graduation Countdown

The clearest difference is update cadence: Calc Engine at daily against Graduation Countdown's every 8 days. Calc Engine also leads on monetization model (free vs free with in-app purchases) and device support (4 vs 2). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Calc Engine sells 1 one-off in-app purchase and Graduation Countdown sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

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

Calc Engine ships an update daily, Graduation Countdown every 8 days. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Calc Engine | Graduation Countdown |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/graduation-countdown-2-weeks/id6747028290/reviews) |
| Number of ratings | 4 | 4 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 8 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 22 MB |
| Requires iOS | 18 | **17.6** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [Havard Tryman](https://appshunter.io/developer/1662964293) |

## What reviewers say

### Calc Engine

[App page](https://appshunter.io/ios/app/calc-engine/id1061766849)

A highly customizable calculator with advanced features like graphing, equation solving, and unit conversion. Design your own keyboards and functions to streamline your workflow across Apple devices.

**Highlights:** Customizable keyboard layouts, User-defined functions and constants, Live equation graphing, Equation solving, Extensive unit conversions, Programmer mode (hex, binary, octal), Cross-device syncing

**Features:** Family Sharing, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calc Engine+ | $9.99 | one-time |


### Graduation Countdown

[App page](https://appshunter.io/ios/app/graduation-countdown-2-weeks/id6747028290)

Easily track important upcoming dates like graduations, birthdays, and holidays with customizable widgets and reminders. Personalize your events with custom colors, background photos, and notes. Never miss a special occasion again.

**Highlights:** Home screen widgets, Event reminders, Repeat events, Custom event colors, Background photos, Event notes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $1.99 | per 7 days |
| Pro | $8.99 | per year |
| Pro | $8.99 | per year |


## Frequently asked questions

### Is Calc Engine free?

Calc Engine is free to download, with in-app purchases available.

### Is Graduation Countdown free?

Graduation Countdown is free to download, with in-app purchases available.

### Which has better reviews, Calc Engine or Graduation Countdown?

Calc Engine and Graduation Countdown are both rated 5.0 out of 5 on the App Store, from 4 and 4 ratings respectively.

### Do Calc Engine or Graduation Countdown have ads?

Neither Calc Engine nor Graduation Countdown shows ads.

### Which is updated more often, Calc Engine or Graduation Countdown?

Calc Engine ships an update daily, and Graduation Countdown every 8 days. Most recently, Calc Engine was updated on October 24, 2026 and Graduation Countdown on October 15, 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.*