Comparison

Calculate84 vs BigFuture School

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

BigFuture School

This app provides students with access to their test scores and personalized college and career information. It helps users plan and pay for college, and connects them with potential scholarship programs. Access requires a mobile number provided during a qualifying test.

Highlights
  • Access test scores
  • Connect with colleges and scholarships
  • Personalized career information
  • College planning and payment guidance
Read full description

Discover majors, colleges, and careers that might align with your goals and interests. See how the skills you may be developing can lead to future pathways. BigFuture School is a free mobile app that helps you explore colleges and careers, see how your skills may connect to future options, and get personalized guidance, all in one place. It is available to you if you are 13 or older in a participating U.S. school and you take an in-school SAT or PSAT assessment and/or are enrolled in eligible AP courses*. You can easily view your in-school SAT Suite score(s) in the app." Can we revise to "You can easily view your score(s) in the app from any in-school SAT or PSAT-related test. To access the app, you’ll need to use the mobile number you initially provided. This account information is separate from your College Board account. If Connections** is offered at your school, it is an optional feature for you to discover nonprofit colleges, scholarship providers, and government agencies administering educational programs that may be a good match and are actively looking for students like you. Learn more about BigFuture School and how to access it: bigfutureschool.org *BigFuture School is not offered to students as part of their AP course participation in New York. There may be other exceptions. **A school, district, or state may choose to not provide access to Connections. Connections is not available to 8th grade PSAT 8/9 test takers or in New York.

Screenshots

Calculate844 screens
BigFuture School4 screens

Verdict

The call

Calculate84 and BigFuture School both sit at 4.8 stars, but that hides the real split: 75% of Calculate84's written reviews are positive against 28% of BigFuture School's. Calculate84 also leads on update cadence (fortnightly vs monthly) and device support (3 vs 1). BigFuture School's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price, rating, ratings volume and iOS requirement 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. BigFuture School asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Calculate84 against 4.6 for BigFuture School. Both are backed by a comparable volume of ratings — 54K and 19K respectively. Written reviews are what separate them: 75% of Calculate84's written reviews are positive against 28% of BigFuture School's.

UpkeepUpdate frequency

Calculate84 ships an update fortnightly, BigFuture School monthly. Both last shipped on October 27, 2026.

Scorecard7 real differences · 4 level
Calculate84 versus BigFuture School: the parameters behind the verdict, then further details
ParameterCalculate84BigFuture School
PriceFreeFree
Rating4.8 (54K ratings) — better4.6 (19K ratings)
Positive reviews74.6% of reviews — better28.1% of reviews
Number of ratings54K — better19K
Update frequencyFortnightly — betterMonthly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#111#2 — better
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS18.017.1 — better
Further details — not scored
Size71 MB25 MB
Age rating12+4+
DeveloperCentury Light LLCThe College Board

Customer experience

Calculate84

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

BigFuture School

All ratings19,466 ratings
Positive92.5%
Neutral2.2%
Negative5.3%
Written reviews356 reviews
Positive28.1%
Neutral6.2%
Negative65.7%

User reviews

Calculate84

From 54K App Store ratings

What we love

  • 👍 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

Room to improve

  • 🐛 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

BigFuture School

From 19K App Store ratings

What we love

  • 🚀 Easy to use
  • 👍 Helpful information and resources
  • 🚀 Straightforward navigation

Room to improve

  • 🐛 Login issues
  • 🐛 Scores not showing up
  • 🐛 Compatibility problems
  • 🐛 Unresponsive customer support

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

BigFuture School

Reported bugs

3 issues
  • Multiple accounts linked to one phone number
  • Recovery email not working
  • Scores not syncing between app and website

Requested features

4 requests
  • Ability to change phone number
  • Better integration with College Board website
  • More customization options
  • Faster score reporting

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

BigFuture School

No in-app purchases

Questions

Is Calculate84 free?
Calculate84 is free to download, with in-app purchases available.
Is BigFuture School free?
BigFuture School is free to download, with no in-app purchases.
Which has better reviews, Calculate84 or BigFuture School?
Calculate84 is rated higher. Calculate84 averages 4.8 out of 5 from 54K ratings, while BigFuture School averages 4.6 from 19K ratings.
Do Calculate84 or BigFuture School have ads?
Calculate84 shows ads; BigFuture School does not.
Which is updated more often, Calculate84 or BigFuture School?
Calculate84 ships an update fortnightly, and BigFuture School monthly. Most recently, Calculate84 was updated on October 27, 2026 and BigFuture School on October 27, 2026.
Which is more popular, Calculate84 or BigFuture School?
Calculate84 currently peaks at #111 in the App Store charts, and BigFuture School at #2. Chart position reflects recent download velocity rather than total install base.

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