Comparison

WattTimeIsIt? vs SFX Scientific Calc Premium

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

Head to head
About

WattTimeIsIt?

Easily adjust cooking times for frozen meals based on your microwave's wattage. Avoid under or overcooking your food by converting standard instructions to match your specific appliance.

Highlights
  • Adjust cooking times for wattage differences
  • Prevent under/overcooking food
  • Works with various microwave wattages
  • Ensures perfectly cooked meals
  • Simple and easy to use tool
Features
Read full description

Have a powerful (or weaker) microwave than the "norm?" Annoyed that frozen dinner packages say, "Cook for 5 minutes on high (based on a 1100W microwave)," but your microwave is 1300W or 700W? This app is for you! WattTimeIsIt? is a simple tool that will ensure that you don't under/overcook your food, given a difference in wattage. Perfectly cooked food designed for your microwave wattage, not a test kitchen's microwave. Just ask WattTimeIsIt? and you're all set! **Remember to be safe and always check the temperature of your food before eating it.**

About

SFX Scientific Calc Premium

This scientific calculator offers advanced functions for academic, scientific, and engineering needs. It supports basic arithmetic, memory storage, statistical calculations, and various mathematical functions. The interface mimics a popular Casio model for ease of use.

Highlights
  • Basic arithmetic operations
  • Constant and volatile memory storage
  • Fraction and percentage calculations
  • Linear regression and statistics
  • Number base conversions (Binary, Octal, Decimal, Hexadecimal)
  • Trigonometric, hyperbolic, and logarithmic functions
  • Formula calculations
Features
Read full description

SFX Calc Premium gives students and engineers a familiar handheld-style scientific calculator on iPhone, iPad, and Mac. From quick arithmetic to statistics and engineering formulas, it keeps advanced calculations in a practical, customizable layout. FEATURES • Scientific functions: trigonometric, hyperbolic, logarithmic, exponential, power, and root • Engineering notation with SI prefixes • Fraction and percentage calculations • Linear regression and statistical calculations • Binary, octal, decimal, and hexadecimal modes • Fixed-constant calculations for repeated operations • One persistent memory plus 10 temporary memory registers • Built-in formulas, including the quadratic formula, standard normal distribution probabilities, and engineering calculations • Configurable 10- or 13-digit display and exponent formats • Copy and paste support for faster workflows • A familiar keypad with customizable layout options • Ads free and no pop-up review Ideal for coursework, laboratories, electronics, mathematics, science, and everyday engineering work.

Screenshots

WattTimeIsIt?4 screens
SFX Scientific Calc Premium4 screens

Verdict

The call

The clearest difference is review sentiment: SFX Scientific Calc Premium at 80% against WattTimeIsIt?'s 50%. SFX Scientific Calc Premium also leads on update cadence (monthly vs every 40 months). WattTimeIsIt?'s advantage is rating (4.7 vs 4.3) and price ($0.99 vs $5.99). On ratings volume, ads, in-app purchases and monetization model 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

WattTimeIsIt? costs $0.99 and SFX Scientific Calc Premium $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

WattTimeIsIt? holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews complicate that: 50% of WattTimeIsIt?'s written reviews are positive against 80% of SFX Scientific Calc Premium's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

WattTimeIsIt? ships an update every 40 months, SFX Scientific Calc Premium monthly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
WattTimeIsIt? versus SFX Scientific Calc Premium: the parameters behind the verdict, then further details
ParameterWattTimeIsIt?SFX Scientific Calc Premium
Price$0.99 — better$5.99
Rating4.7 (3 ratings) — better4.3 (3 ratings)
Positive reviews50.0% of reviews80.0% of reviews — better
Number of ratings33
Update frequencyEvery 40 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS14.014.0
Further details — not scored
Size2 MB16 MB
Age rating4+4+
DeveloperVisoft, Inc.Wai Kwong Lee

Customer experience

WattTimeIsIt?

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

SFX Scientific Calc Premium

All ratings3 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral20.0%
Negative0.0%

In-app purchases

None

WattTimeIsIt?

No in-app purchases

None

SFX Scientific Calc Premium

No in-app purchases

Questions

Is WattTimeIsIt? free?
WattTimeIsIt? costs $0.99, with no in-app purchases.
Is SFX Scientific Calc Premium free?
SFX Scientific Calc Premium costs $5.99, with no in-app purchases.
Which has better reviews, WattTimeIsIt? or SFX Scientific Calc Premium?
WattTimeIsIt? is rated higher. WattTimeIsIt? averages 4.7 out of 5 from 3 ratings, while SFX Scientific Calc Premium averages 4.3 from 3 ratings.
Do WattTimeIsIt? or SFX Scientific Calc Premium have ads?
Neither WattTimeIsIt? nor SFX Scientific Calc Premium shows ads.
Which is updated more often, WattTimeIsIt? or SFX Scientific Calc Premium?
WattTimeIsIt? ships an update every 40 months, and SFX Scientific Calc Premium monthly. Most recently, WattTimeIsIt? was updated on November 6, 2026 and SFX Scientific Calc Premium on November 3, 2026.

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