# Sets Challenge vs Calculate84

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.

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 11, 2026 respectively.

## The numbers

| Metric | Sets Challenge | Calculate84 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/sets-challenge/id1164791679/reviews) | **[4.8 (55K ratings)](https://appshunter.io/ios/app/calculate84/id1459712793/reviews)** |
| Number of ratings | 4 | **55K** |
| Positive reviews | 33.3% of reviews | **74.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#104** |
| Size | 8 MB | 71 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [Knowledge Platform Pte Ltd](https://appshunter.io/developer/516535412) | [Century Light LLC](https://appshunter.io/developer/1459712792) |

## What reviewers say

### Sets Challenge

[App page](https://appshunter.io/ios/app/sets-challenge/id1164791679)

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.

**Highlights:** Master set theory basics, Practice intersection, union, complement, Multi-level gameplay, Play solo or in groups, Classroom projector display option

**Features:** macOS Compatibility

**In-app purchases:** none


### Calculate84

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

**Currently charting:** #104 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


## Frequently asked questions

### Is Sets Challenge free?

Sets Challenge is free to download, with no in-app purchases.

### Is Calculate84 free?

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

### Which has better reviews, Sets Challenge or Calculate84?

Calculate84 is rated higher. Sets Challenge averages 3.0 out of 5 from 4 ratings, while Calculate84 averages 4.8 from 55K ratings.

### Do Sets Challenge or Calculate84 have ads?

Calculate84 shows ads; Sets Challenge does not.

### Which is updated more often, Sets Challenge or Calculate84?

Sets Challenge ships an update every 4 months, and Calculate84 fortnightly. Most recently, Sets Challenge was updated on November 2, 2026 and Calculate84 on November 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*