# Calculate84 vs Carbon Compass

The clearest difference is in-app purchases: Carbon Compass at none against Calculate84's 6. Carbon Compass also leads on ads (none vs shown) and update cadence (daily vs fortnightly). Calculate84's advantage is chart position (#106 vs unranked). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Calculate84 sells 6 in-app purchases, starting at $2.99 per month. Carbon Compass asks for nothing beyond the download.

Calculate84 ships an update fortnightly, Carbon Compass daily. The most recent releases landed on November 12, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Calculate84 | Carbon Compass |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (55K ratings)](https://appshunter.io/ios/app/calculate84/id1459712793/reviews)** | — |
| Number of ratings | **55K** | — |
| Positive reviews | 74.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#106** | — |
| Size | 71 MB | 17 MB |
| Requires iOS | **18.0** | 18.5 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Century Light LLC](https://appshunter.io/developer/1459712792) | [vikas mehta](https://appshunter.io/developer/1700031419) |

## What reviewers say

### Calculate84

[App page](https://appshunter.io/ios/app/calculate84/id1459712793)

**Currently charting:** #106 Top Free · Education (US App Store)

This app offers a modern graphing calculator experience on your iPhone. It features fast, interactive touch-screen graphing, scrollable windows, and intelligent error messages for a more intuitive user experience. Designed to be a usable alternative to physical graphing calculators.

**Highlights:** Fast, interactive touch-screen graphing, Scrollable windows, Intelligent error messages, Intuitive interface, Designed for TI-84 users

**Features:** Family Sharing, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro Subscription | $2.99 | per month |
| Annual Pro Subscription | $6.99 | per year |
| Lifetime Subscription | $6.99 | one-time |
| Lifetime Subscription | $9.99 | one-time |
| Lifetime Subscription | $12.99 | one-time |
| Lifetime Pro Subscription | $29.99 | one-time |

**What reviewers like**

- 👍 Identical to TI-84 calculator
- 🚀 Seamless and intuitive user experience
- 💰 Affordable alternative to physical calculator
- 📱 Convenient to have on phone
- 🔍 Comprehensive functionality matching physical calculator

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🔍 Missing some advanced features like regression types
- 🔒 Previous purchases removed without warning
- 💰 Subscription model can be expensive
- 📺 Intrusive ads in free version

**Reported bugs**

- Crashes when using 2-sample T/Z interval functions
- Incorrect results for inverse trig functions
- Issues with graphing parabolas and tracing points
- Regression equation not displayed correctly

**Requested features**

- Add TVM solver functionality
- Implement more regression types
- Allow disabling of ads for free users
- Restore previous purchase benefits
- Optimize for mobile experience instead of emulating physical calculator


### Carbon Compass

[App page](https://appshunter.io/ios/app/carbon-compass/id6749557862)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculate84 free?

Calculate84 is free to download, with in-app purchases available.

### Is Carbon Compass free?

Carbon Compass is free to download, with no in-app purchases.

### Do Calculate84 or Carbon Compass have ads?

Calculate84 shows ads; Carbon Compass does not.

### Which is updated more often, Calculate84 or Carbon Compass?

Calculate84 ships an update fortnightly, and Carbon Compass daily. Most recently, Calculate84 was updated on November 12, 2026 and Carbon Compass on November 8, 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.*