FastCalc lite vs e
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastCalc lite
This calculator app offers a streamlined experience with large, easy-to-use keys and a permanent display of your calculations. It automatically shows results as you type, eliminating the need for an equals button.
- Large, easy-to-read keys
- Permanent expression display
- Automatic result display
- Gesture-based interface
- Integrated help videos
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FastCalc lite is a calculator recognized for its efficiency and ease of use. It stands out thanks to: • its large keys, which allow for fast and accurate input, • the permanent display of the expression entered by the user, • the automatic display of the result while typing: no “=” key required! FastCalc lite is thus a simple and efficient calculator, ideal for everyday calculations. BASICS OF USE The interface of FastCalc lite is innovative and minimalist, entirely based on simple gestures: • Select a side symbol on a key: slide your finger in its direction. • Delete the last entered elements: make a small swipe to the left on the display. • Clear the entire expression: swipe quickly to the left across the whole display. FEATURES • Large, practical, and easy-to-read keys. • Permanent display of the current expression. • Integrated help videos and user guide (in ⓘ).
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.
Screenshots
Verdict
The clearest difference is rating: FastCalc lite at 3.8 against e's 3.0. FastCalc lite also leads on ratings volume (15 vs 1) and review sentiment (67% vs 56%). e's advantage is iOS requirement (6.1 vs 26.0). On price, update cadence, 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.
FastCalc lite holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: FastCalc lite has 15 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 67% of FastCalc lite's written reviews are positive against 56% of e's.
Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.
| Parameter | FastCalc lite | e |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (15 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 66.7% of reviews — better | 55.6% of reviews |
| Number of ratings | 15 — better | 1 |
| Update frequency | Every 5 months | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 6.1 — better |
| Further details — not scored | ||
| Size | 9 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Andre Ponzo | e-skett Corp. |
Customer experience
FastCalc lite
e
In-app purchases
FastCalc lite
No in-app purchases
e
No in-app purchases
