STEM at SFA vs Calculate84
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
STEM at SFA
Engage with professors on science, technology, engineering, and math topics. Explore the outdoors with a GPS-based activity feature.
- Ask professors questions
- STEM subject focus
- Outdoor GPS activity
- Interactive learning
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Ask professors questions about science, technology, engineering, and mathematics. You can also participate in an outdoor GPS activity using this app.
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 in-app purchases: STEM at SFA at none against Calculate84's 6. STEM at SFA also leads on ads (none vs shown) and review sentiment (100% vs 75%). Calculate84's advantage is update cadence (fortnightly vs every 6 months) and ratings volume (54K vs 7). 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. STEM at SFA asks for nothing beyond the download.
STEM at SFA 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 7, so its average is the more settled of the two. Written reviews point the same way: 100% of STEM at SFA's written reviews are positive against 75% of Calculate84's.
STEM at SFA ships an update every 6 months, Calculate84 fortnightly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | STEM at SFA | Calculate84 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (7 ratings) — better | 4.8 (54K ratings) |
| Positive reviews | 100.0% of reviews — better | 74.6% of reviews |
| Number of ratings | 7 | 54K — better |
| Update frequency | Every 6 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | — | #111 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 8.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 30 MB | 71 MB |
| Age rating | 4+ | 12+ |
| Developer | Elemental Software, LLC | Century Light LLC |
Customer experience
STEM at SFA
Calculate84
Bugs and requests
STEM at SFA
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
STEM at SFA
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 STEM at SFA free?
Is Calculate84 free?
Which has better reviews, STEM at SFA or Calculate84?
Do STEM at SFA or Calculate84 have ads?
Which is updated more often, STEM at SFA or Calculate84?
Other comparisons
