# Calculate84 vs PAC Agent

The clearest difference is in-app purchases: PAC Agent at none against Calculate84's 6. PAC Agent also leads on ads (none vs shown) and update cadence (daily vs fortnightly). Calculate84's advantage is ratings volume (54K vs 1) and chart position (#160 vs unranked). 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. PAC Agent asks for nothing beyond the download.

PAC Agent 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.

Calculate84 ships an update fortnightly, PAC Agent daily. The most recent releases landed on October 26, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Calculate84 | PAC Agent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (54K ratings)](https://appshunter.io/ios/app/calculate84/id1459712793/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pac-agent/id6808559932/reviews)** |
| Number of ratings | **54K** | 1 |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#160** | — |
| Size | 71 MB | 33 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Century Light LLC](https://appshunter.io/developer/1459712792) | [AURIGA IT CONSULTING PRIVATE LIMITED](https://appshunter.io/developer/1082987176) |

## What reviewers say

### Calculate84

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

**Currently charting:** #160 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


### PAC Agent

[App page](https://appshunter.io/ios/app/pac-agent/id6808559932)

This AI-powered study companion integrates with your university's learning management system to provide course-specific answers and organize assignments. It helps you track deadlines, generate study materials, and manage your academic progress all in one place.

**Highlights:** AI chatbot grounded in course materials, Syncs with university LMS, Assignment and deadline tracking, Generate study guides and summaries, Export documents to PDF, Multi-university support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Calculate84 free?

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

### Is PAC Agent free?

PAC Agent is free to download, with no in-app purchases.

### Which has better reviews, Calculate84 or PAC Agent?

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

### Do Calculate84 or PAC Agent have ads?

Calculate84 shows ads; PAC Agent does not.

### Which is updated more often, Calculate84 or PAC Agent?

Calculate84 ships an update fortnightly, and PAC Agent daily. Most recently, Calculate84 was updated on October 26, 2026 and PAC Agent 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.*