Sets Challenge vs Calculate84
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sets Challenge
Master fundamental set theory concepts through an engaging, multi-level game. Practice operations like intersection, union, and complement individually or with others. Ideal for students and educators, it can even be used for classroom presentations.
- Master set theory basics
- Practice intersection, union, complement
- Multi-level gameplay
- Play solo or in groups
- Classroom projector display option
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Sets Challenge is a multi-level game that will help you master the basic of sets theory while having fun and challenging yourself and your colleagues. Play this game to learn about and use the intersection, union, complement, power sets and other operators. You can play by yourself or in groups. Sets Challenge may also be displayed via a projector for a really engaging in-class game. A must play for students; a must use for teachers!
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
Screenshots
Verdict
The clearest difference is rating: Calculate84 at 4.8 against Sets Challenge's 3.0. Calculate84 also leads on review sentiment (74% vs 33%) and update cadence (fortnightly vs every 4 months). Sets Challenge's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price 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
Both are free to download. Calculate84 sells 6 in-app purchases, starting at $2.99 per month. Sets Challenge asks for nothing beyond the download.
Calculate84 holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Calculate84 has 55K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 33% of Sets Challenge's written reviews are positive against 74% of Calculate84's.
Sets Challenge ships an update every 4 months, Calculate84 fortnightly. The most recent releases landed on November 2, 2026 and November 10, 2026 respectively.
| Parameter | Sets Challenge | Calculate84 |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (4 ratings) | 4.8 (55K ratings) — better |
| Positive reviews | 33.3% of reviews | 74.2% of reviews — better |
| Number of ratings | 4 | 55K — better |
| Update frequency | Every 4 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | — | #105 — better |
| Devices | iPhone, iPod | iPhone, iPad, Mac — better |
| Requires iOS | 9.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 8 MB | 71 MB |
| Age rating | 4+ | 12+ |
| Developer | Knowledge Platform Pte Ltd | Century Light LLC |
Customer experience
Sets Challenge
Calculate84
Bugs and requests
Sets Challenge
Not enough reviews yet to summarise bugs or 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
In-app purchases
Sets Challenge
No 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
Questions
Is Sets Challenge free?
Is Calculate84 free?
Which has better reviews, Sets Challenge or Calculate84?
Do Sets Challenge or Calculate84 have ads?
Which is updated more often, Sets Challenge or Calculate84?
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