Comparison

Calculate84 vs PAC Agent

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Fast, interactive touch-screen graphing
  • Scrollable windows
  • Intelligent error messages
  • Intuitive interface
  • Designed for TI-84 users
Features
Currently charting
Read full description

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

About

PAC Agent

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
Read full description

PAC Agent is an AI-powered study companion that connects directly to your university's learning management system (LMS) — so it always knows what you're actually working on. CHAT WITH AN AI THAT KNOWS YOUR COURSEWORK Ask questions and get answers grounded in your real courses, readings, and assignments — not generic guesses. Switch between specialized agents for different kinds of help, and pick up any past conversation right where you left off. EVERYTHING FROM YOUR LMS, IN ONE PLACE Connect your university account once and PAC Agent keeps your courses, assignments, announcements, discussions, and grades in sync automatically. Browse resources, track upcoming deadlines, and see how you're doing across every class without switching apps. NEVER MISS A DEADLINE A clear, color-coded view of what's due today, this week, and beyond. Create new assignments with a due date and time, attach a file, and get AI help on them directly from the assignment page. TURN AI ANSWERS INTO REAL DOCUMENTS Ask PAC Agent to write up a study guide, summary, or outline, and export it straight to PDF from the chat — ready to share or print. TRACK YOUR USAGE, MANAGE YOUR PLAN See exactly how much you're using PAC Agent, review your billing history, and manage your subscription — all from the app. BUILT FOR HOW YOU ACTUALLY STUDY Switch your display timezone independently of your device, and move between multiple universities if you have access to more than one.

Screenshots

Calculate844 screens
PAC Agent4 screens

Verdict

The call

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 (#210 vs unranked). 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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Calculate84 ships an update fortnightly, PAC Agent daily. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

Scorecard8 real differences · 3 level
Calculate84 versus PAC Agent: the parameters behind the verdict, then further details
ParameterCalculate84PAC Agent
PriceFreeFree
Rating4.8 (54K ratings)5.0 (1 ratings) — better
Positive reviews74.6% of reviews—
Number of ratings54K — better1
Update frequencyFortnightlyDaily — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#210 — better—
DevicesiPhone, iPad, Mac — betteriPhone, iPod
Requires iOS18.015.5 — better
Further details — not scored
Size71 MB33 MB
Age rating12+4+
DeveloperCentury Light LLCAURIGA IT CONSULTING PRIVATE LIMITED

Customer experience

Calculate84

All ratings53,397 ratings
Positive95.1%
Neutral1.8%
Negative3.1%
Written reviews386 reviews
Positive74.6%
Neutral8.8%
Negative16.6%

PAC Agent

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

PAC Agent

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Calculate84

Subscriptions2
  • Monthly Pro Subscription3 Days trial$2.991 Month
  • Annual Pro Subscription7 Days trial$6.991 Year
One-time4
  • Lifetime Subscription$6.99
  • Lifetime Subscription$9.99
  • Lifetime Subscription$12.99
Show 1 more
  • Lifetime Pro Subscription$29.99
None

PAC Agent

No in-app purchases

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 25, 2026 and PAC Agent on October 9, 2026.

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