# StelaClock vs Calculator HD Pro

The clearest difference is in-app purchases: StelaClock at none against Calculator HD Pro's 2. StelaClock also leads on price ($3.99 vs $9.99). Calculator HD Pro's advantage is update cadence (every 2 months vs every 29 months) and ratings volume (11K vs 6). On rating, ads and device support there is nothing between them.

StelaClock costs $3.99 and Calculator HD Pro $9.99 up front. Calculator HD Pro sells 2 one-off in-app purchases. StelaClock asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for StelaClock against 4.8 for Calculator HD Pro. That said, the two scores are not equally well evidenced: Calculator HD Pro has 11K ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 86% of StelaClock's written reviews are positive against 95% of Calculator HD Pro's.

StelaClock ships an update every 29 months, Calculator HD Pro every 2 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | StelaClock | Calculator HD Pro |
| --- | --- | --- |
| Price | **$3.99** | $9.99 |
| Rating | [4.7 (6 ratings)](https://appshunter.io/ios/app/stelaclock/id528908559/reviews) | **[4.8 (11K ratings)](https://appshunter.io/ios/app/calculator-hd-pro/id565023649/reviews)** |
| Number of ratings | 6 | **11K** |
| Positive reviews | 85.7% of reviews | **94.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 48 MB |
| Requires iOS | 26.0 | **15.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gary Saggu](https://appshunter.io/developer/465733546) | [Cider Software LLC](https://appshunter.io/developer/465180756) |

## What reviewers say

### StelaClock

[App page](https://appshunter.io/ios/app/stelaclock/id528908559)

Discover the Mayan calendar and number system with this educational clock app. It displays the current time and date using Mayan glyphs and a Base 20 notation, offering a unique way to experience ancient Maya culture.

**Highlights:** Mayan calendar display, Mayan number system, Vigesimal (Base 20) notation, Sophisticated calendar converter, Mayan glyph numerals, Daily use clock

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

**In-app purchases:** none


### Calculator HD Pro

[App page](https://appshunter.io/ios/app/calculator-hd-pro/id565023649)

This app offers a powerful and customizable calculator experience with a dual-line display for seeing input and results simultaneously. Save and organize your calculations with history, labeling, and email options. Personalize layouts, themes, and fonts for a comfortable and efficient user experience.

**Highlights:** Dual-line display, Multi-line input, Calculation history, Customizable layouts and themes, Full scientific functions, Left-handed mode, VoiceOver accessibility

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Widget | $1.99 | one-time |
| Multiple History Tapes | $1.99 | one-time |

**What reviewers like**

- 🚀 Significantly better than Apple's calculator
- 👍 Excellent app with great features
- 👍 Flawless app, very useful
- 👍 Fantastic calculator, meets all needs
- 👍 Best calculator app, highly recommended

**What reviewers complain about**

- 🐛 Bothersome pop-up review requests
- 🐛 Cannot delete lists in history tapes
- 🐛 Repeated rate and review pop-ups

**Reported bugs**

- Cannot delete lists in history tapes
- Ads still appear after purchasing full version

**Requested features**

- Add binary, decimal, and hex conversion
- Ability to manually sort result lines
- Add a tax calculation button


## Frequently asked questions

### Is StelaClock free?

StelaClock costs $3.99, with no in-app purchases.

### Is Calculator HD Pro free?

Calculator HD Pro costs $9.99, and also offers in-app purchases.

### Which has better reviews, StelaClock or Calculator HD Pro?

Calculator HD Pro is rated higher. StelaClock averages 4.7 out of 5 from 6 ratings, while Calculator HD Pro averages 4.8 from 11K ratings.

### Do StelaClock or Calculator HD Pro have ads?

Neither StelaClock nor Calculator HD Pro shows ads.

### Which is updated more often, StelaClock or Calculator HD Pro?

StelaClock ships an update every 29 months, and Calculator HD Pro every 2 months. Most recently, StelaClock was updated on October 23, 2026 and Calculator HD Pro on October 26, 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.*