Comparison

StemFox Scientific Calculator vs ENGINE SFC

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

Head to head
About

StemFox Scientific Calculator

Streamline complex STEM calculations with a powerful calculator, textbook equation solver, and comprehensive unit converter. Designed for engineers, it reduces busywork and improves accuracy for homework and technical tasks.

Highlights
  • Advanced scientific calculator with 80+ functions
  • Textbook equation solver for any variable
  • Searchable equation database by chapter
  • Fast table lookup with linear interpolation
  • Comprehensive unit converter with 300+ conversions
  • Copy and paste functionality for values and equations
Read full description

Become a better engineer! Stop wasting your time on pointless busy work! Complete your calculations more quickly and accurately. Designed by an engineer, for engineers, StemFox has all the tools you need: Calculator STEM homework is technical and demanding. Accordingly, StemFox includes a calculator able to handle the most complex equations. From trigonometry to Bessel functions, StemFox has you covered! ・More than 80 mathematical functions. ・Quick reference to common basic scientific functions and operators. ・Quickly and easily copy and paste values. ・Quickly reference calculations in all parts of the app. ・Reference previous calculations via the ans(x) method. ・Prettyprint formatting of calculations. Textbook Companions Homework is an important portion of education. Entering equations into your calculator is not. Yet, this tedious error prone activity takes up a significant portion of homework time. Enter StemFox Textbook Companions. Textbook Companions contain references to a textbook’s equations and tables. Equations: ・Equations are referenced by number and name/description. ・Equations are searchable and divided into chapters for quick reference. ・Equations are solvable for any variable. Enter the known variables, and solve for the unknown one. ・Avoid error prone calculator entry. ・Avoid the errors and tedium of entering variables multiple times in the same equation. ・Decreases calculation time by as much as 90% over entering the entire formula yourself! Tables: ・Quickly lookup table values. ・Fast, easy, accurate, table linear interpolation. ・Copy and paste values with a simple tap, no transcription errors! Yay! Unit Converter Unit conversion is a common STEM activity. To speed up this irritating activity, StemFox offers the most comprehensive scientific unit converter available! ・More than two dozen separate units and nearly 300 individual conversions available. ・Tap to copy, tap to paste. SUBSCRIPTION INFORMAITON: • Subscribe on a monthly or annual basis to receive Unlimited Daily Solutions for the duration of the subscription. • Payment will be charged to iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Setting after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription, where applicable. Terms of Use: http://stemfox.io/index.php/eula/ Privacy Policy: http://stemfox.io/index.php/privacy-policy/

About

ENGINE SFC

Features
Read full description

CALCULATION OF MARINE ENGINE FUEL CONSUMPTION

Screenshots

StemFox Scientific Calculator4 screens
ENGINE SFC1 screens

Verdict

The call

The clearest difference is in-app purchases: ENGINE SFC at none against StemFox Scientific Calculator's 6. ENGINE SFC also leads on update cadence (daily vs every 3 months). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. StemFox Scientific Calculator sells 6 in-app purchases, starting at $2.99 per month. ENGINE SFC asks for nothing beyond the download.

UpkeepUpdate frequency

StemFox Scientific Calculator ships an update every 3 months, ENGINE SFC daily. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.

Scorecard2 real differences · 8 level
StemFox Scientific Calculator versus ENGINE SFC: the parameters behind the verdict, then further details
ParameterStemFox Scientific CalculatorENGINE SFC
PriceFreeFree
Rating4.8 (10 ratings) — better—
Positive reviews90.0% of reviews—
Number of ratings10 — better—
Update frequencyEvery 3 monthsDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15 — better15.2
Further details — not scored
Size16 MB6 MB
Age rating4+4+
DeveloperJoshua BrysonOleksii Nezhalskyi

In-app purchases

6 purchases

StemFox Scientific Calculator

Subscriptions2
  • Monthly - Unlimited7 Days trial$2.991 Month
  • Yearly - Unlimited7 Days trial$9.991 Year
One-time4
  • Donut$0.99
  • Drink$2.99
  • Taco$4.99
Show 1 more
  • Pizza$9.99
None

ENGINE SFC

No in-app purchases

Questions

Is StemFox Scientific Calculator free?
StemFox Scientific Calculator is free to download, with in-app purchases available.
Is ENGINE SFC free?
ENGINE SFC is free to download, with no in-app purchases.
Do StemFox Scientific Calculator or ENGINE SFC have ads?
Neither StemFox Scientific Calculator nor ENGINE SFC shows ads.
Which is updated more often, StemFox Scientific Calculator or ENGINE SFC?
StemFox Scientific Calculator ships an update every 3 months, and ENGINE SFC daily. Most recently, StemFox Scientific Calculator was updated on October 10, 2026 and ENGINE SFC on September 30, 2026.

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