WattTimeIsIt? vs SFX Scientific Calc Premium
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.**
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | WattTimeIsIt? | SFX Scientific Calc Premium |
|---|---|---|
| Price | $0.99 — better | $5.99 |
| Rating | 4.7 (3 ratings) — better | 4.3 (3 ratings) |
| Positive reviews | 50.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 3 | 3 |
| Update frequency | Every 40 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 2 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Visoft, Inc. | Wai Kwong Lee |
Customer experience
WattTimeIsIt?
SFX Scientific Calc Premium
In-app purchases
WattTimeIsIt?
No in-app purchases
SFX Scientific Calc Premium
No in-app purchases
Questions
Is WattTimeIsIt? free?
Is SFX Scientific Calc Premium free?
Which has better reviews, WattTimeIsIt? or SFX Scientific Calc Premium?
Do WattTimeIsIt? or SFX Scientific Calc Premium have ads?
Which is updated more often, WattTimeIsIt? or SFX Scientific Calc Premium?
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