Calculate84 vs Carbon Compass
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Carbon Compass
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Carbon Compass is your personal guide to building sustainable habits and fighting climate change. Complete daily tasks to earn Eco-Points and build a daily streak. Use our Carbon Footprint Calculator to understand your impact, then get personalized tips and challenges. Stay informed with daily eco-news and fun trivia. With Carbon Compass, every small action you take helps make a bigger difference.
Screenshots
Verdict
The clearest difference is in-app purchases: Carbon Compass at none against Calculate84's 6. Carbon Compass also leads on ads (none vs shown) and update cadence (daily vs fortnightly). Calculate84's advantage is chart position (#106 vs unranked). On price, device support 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
Both are free to download. Calculate84 sells 6 in-app purchases, starting at $2.99 per month. Carbon Compass asks for nothing beyond the download.
Calculate84 ships an update fortnightly, Carbon Compass daily. The most recent releases landed on November 12, 2026 and November 8, 2026 respectively.
| Parameter | Calculate84 | Carbon Compass |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (55K ratings) — better | — |
| Positive reviews | 74.2% of reviews | — |
| Number of ratings | 55K — better | — |
| Update frequency | Fortnightly | Daily — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #106 — better | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 18.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 71 MB | 17 MB |
| Age rating | 12+ | 4+ |
| Developer | Century Light LLC | vikas mehta |
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
Carbon Compass
Not enough reviews yet to summarise bugs or requests.
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
Carbon Compass
No in-app purchases
Questions
Is Calculate84 free?
Is Carbon Compass free?
Do Calculate84 or Carbon Compass have ads?
Which is updated more often, Calculate84 or Carbon Compass?
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