# Calculate84 vs Z

The clearest difference is price: Calculate84 at Free against Z's $2.99. Calculate84 also leads on ratings volume (54K vs 1) and update cadence (fortnightly vs every 6 weeks). Z's advantage is in-app purchases (none vs 6) and review sentiment (100% vs 75%). On ads and device support there is nothing between them.

Calculate84 is free to download; Z costs $2.99 up front. Calculate84 sells 6 in-app purchases, starting at $2.99 per month. Z asks for nothing beyond the download.

Z holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Calculate84 has 54K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of Calculate84's written reviews are positive against 100% of Z's.

Calculate84 ships an update fortnightly, Z every 6 weeks. The most recent releases landed on October 31, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Calculate84 | Z |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.8 (54K ratings)](https://appshunter.io/ios/app/calculate84/id1459712793/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/z-table-statistics/id6738610691/reviews)** |
| Number of ratings | **54K** | 1 |
| Positive reviews | 74.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Best chart rank | **#189** | — |
| Size | 71 MB | 32 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Century Light LLC](https://appshunter.io/developer/1459712792) | [JanoGroup LLC](https://appshunter.io/developer/1781461557) |

## What reviewers say

### Calculate84

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

**Currently charting:** #189 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


### Z

[App page](https://appshunter.io/ios/app/z-table-statistics/id6738610691)

This app provides a quick and easy way for students and professionals to look up Z-scores and calculate corresponding probabilities. It features comprehensive Z-score tables and a user-friendly interface for efficient statistical analysis.

**Highlights:** Comprehensive Z-score tables, Fast probability calculation, User-friendly interface, Educational tool for statistics, Reference for data analysis

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculate84 free?

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

### Is Z free?

Z costs $2.99, with no in-app purchases.

### Which has better reviews, Calculate84 or Z?

Z is rated higher. Calculate84 averages 4.8 out of 5 from 54K ratings, while Z averages 5.0 from 1 ratings.

### Do Calculate84 or Z have ads?

Both Calculate84 and Z show ads.

### Which is updated more often, Calculate84 or Z?

Calculate84 ships an update fortnightly, and Z every 6 weeks. Most recently, Calculate84 was updated on October 31, 2026 and Z on October 9, 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.*