e vs Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
e
This scientific calculator supports engineering notation with prefixes like pico, nano, and mega. It offers a history feature to review past calculations and allows editing of formulas for recalculation. The free version has some limitations on history scrolling and saving.
- Scientific notation support
- Engineering multipliers (p, n, u, m, k, M)
- History of past calculations
- Editable formulas for recalculation
- Unit conversion for engineering prefixes
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This calculator can be used not only in scientific notation(e.g. 1E-6) but also using engineering multipliers(e.g. p,n,u,m,k,M). By pressing the [ENG] button, the display of calculation result will change. (e.g. 1E-9 or 1n) Calculation results in the past is displayed in the history area. When you tap the formula area , you will be able to edit it. You will be able to re-calculate. Unit that can be entered from the button is p = 1E-12, n = 1E-9, u = 1E-6, m = 1E-3, k = 1E3, M = 1E6. (f = 1E-15 and G = 1E9 is used for display only）. iPhone4 can display four lines in history area. iPhone5 can display 9 lines. The main limitations of Free version is as follows. you can not scroll history area. History is not saved when you exit.
Calc
This app offers a high-precision scientific calculator with over 50 digits of accuracy. It supports advanced mathematical functions, complex arithmetic, and programmable features for derivatives, integrals, and root finding.
- High-precision calculations (50+ digits)
- Extensive mathematical functions
- Programmable features
- Complex arithmetic
- Graphing capabilities
- Derivative and integral calculation
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Calc-50 is a high-precision scientific graphing RPN calculator. It carries over 50 digits of accuracy and has a large number of mathematical functions, including trig and hyperbolic functions and their inverses, and math special functions such as gamma, beta, psi, exponential integral, sine, cosine, and log integrals, Bessel functions, and more. It is programmable, with functions that take user functions and find derivatives, integrals, function max/min, and roots. Calc-50 also provides complex arithmetic and elementary functions.
Screenshots
Verdict
The clearest difference is rating: Calc at 3.7 against e's 3.0. Calc also leads on ratings volume (3 vs 1). e's advantage is update cadence (every 5 months vs every 10 months) and iOS requirement (6.1 vs 12.0). On price, review sentiment, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Calc holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 56% of e's written reviews are positive against 50% of Calc's, so the app with the better star average is not the one people write more warmly about.
e ships an update every 5 months, Calc every 10 months. The most recent releases landed on October 19, 2026 and October 26, 2026 respectively.
| Parameter | e | Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) | 3.7 (3 ratings) — better |
| Positive reviews | 55.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 5 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 6.1 — better | 12.0 |
| Further details — not scored | ||
| Size | 7 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | e-skett Corp. | David Smith |
Customer experience
e
Calc
In-app purchases
e
No in-app purchases
Calc
No in-app purchases
