Calculate84 vs Z
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculate84
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.
- Fast, interactive touch-screen graphing
- Scrollable windows
- Intelligent error messages
- Intuitive interface
- Designed for TI-84 users
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Graphing made for iPhone Calculate84 brings the graphing calculator experience to iPhone with a fast, touch-friendly design. What you can do: • Plot and explore graphs with smooth touch controls • Find familiar calculator functions quickly • Scroll naturally through equations and results • Get clearer, more helpful error messages • Send feedback directly from the app Why we built Calculate84 We relied on graphing calculators ourselves and wanted an app that felt easier to use on a modern phone. Before launch, we worked with students to refine the experience, and we continue improving it based on user feedback. Send feedback Tap the red Feedback button in the app. Terms of Use (EULA): https://calculate84.com/terms-of-use
Z
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.
- Comprehensive Z-score tables
- Fast probability calculation
- User-friendly interface
- Educational tool for statistics
- Reference for data analysis
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Z-Table is a simple and powerful tool designed to help students, statisticians, and professionals look up Z-scores and corresponding probabilities with ease. Whether you're studying for an exam or working on data analysis, this app provides an efficient way to calculate and reference Z-scores. Key Features: Comprehensive Z-Score Tables: Access both positive and negative Z-tables to quickly look up critical Z-scores. Fast Probability Calculation: Find left-tail and right-tail probabilities with ease. User-Friendly Interface: The clean and minimal design ensures you can get the values you need without distractions. Educational Tool: Ideal for statistics students or professionals who frequently work with normal distributions. Why Choose Z-Table? Z-Table is optimized for speed and ease of use. Whether you are working on statistical analysis, preparing for exams, or just need a quick reference, Z-Table is the perfect companion. No ads, no distractions—just reliable and accurate statistical data at your fingertips. Who is this app for? Statistics students and teachers Data analysts and researchers Professionals in need of quick statistical references Download Z-Table today and simplify your statistical analysis process!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Calculate84 | Z |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.8 (54K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 74.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 54K — better | 1 |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Best chart rank | #181 — better | — |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 18.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 71 MB | 32 MB |
| Age rating | 12+ | 4+ |
| Developer | Century Light LLC | JanoGroup LLC |
Customer experience
Calculate84
Z
Bugs and requests
Calculate84
Reported bugs
4 issues- 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
5 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calculate84
- Monthly Pro Subscription3 Days trial$2.991 Month
- Annual Pro Subscription7 Days trial$6.991 Year
- Lifetime Subscription$6.99
- Lifetime Subscription$9.99
- Lifetime Subscription$12.99
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- Lifetime Pro Subscription$29.99
Z
No in-app purchases
Questions
Is Calculate84 free?
Is Z free?
Which has better reviews, Calculate84 or Z?
Do Calculate84 or Z have ads?
Which is updated more often, Calculate84 or Z?
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