FastCalc vs CAT eService
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastCalc
This calculator app offers a streamlined experience with large, easy-to-use keys and an innovative gesture-based interface. It displays your ongoing expression and results in real-time, eliminating the need for an equals button. Advanced features include percentage calculations and customizable constants.
- Large, practical keys
- Permanent expression display
- Automatic real-time results
- Gesture-based input
- Customizable constants
- Advanced percentage mode
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FastCalc 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 is thus suitable both for everyday calculations and for more advanced use. BASICS OF USE The interface of FastCalc 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. • Store a result in a memory: tap the result and choose the desired memory. FEATURES • Large, practical, and easy-to-read keys. • Customizable constants. • Advanced mode for percentage calculations. • Permanent display of the current expression and temporary memories. • Automatic storage of the previous result (ANS) each time an expression is cleared. • Integrated help videos and user guide (in ⓘ). SETTINGS • Enable interface sounds and adjust their volume. • Enable advanced mode. • Choose the number of displayed decimals and the thousands separators. • Customize the colors of the keypad and the expression.
CAT eService
Access CAT telecom services conveniently. Manage your profile, view usage history, make online payments, and add or remove services. Stay updated with news and promotions, and easily contact customer support.
- Profile management
- Usage history tracking
- Online payment processing
- Service addition/removal
- News and promotions updates
- Contact and support options
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CAT eService Version 1.0 We concern in your convenience to get our information, promotion and news anytime. CAT eService has feature by following : Profile History usage Online payment Add / remove service News and promotion Contact us / Maps / Chat / Call center / e-mail Require registration for CAT eService Connection: 3G/EDGE/GPRS or Wi-Fi
Screenshots
Verdict
The clearest difference is review sentiment: FastCalc at 80% against CAT eService's 0%. CAT eService's advantage is price (Free vs $1.99) and in-app purchases (none vs 4). On update cadence, ads and device support 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
CAT eService is free to download; FastCalc costs $1.99 up front. FastCalc sells 4 one-off in-app purchases. CAT eService asks for nothing beyond the download.
FastCalc ships an update every 5 months, CAT eService every 6 months. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.
| Parameter | FastCalc | CAT eService |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 80.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 5 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Andre Ponzo | NATIONAL TELECOM PUBLIC COMPANY LIMITED |
Customer experience
FastCalc
CAT eService
In-app purchases
FastCalc
- Red Rivella$1.99
- Homemade hot chocolate$6.99
- Bircher muesli$12.99
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- Moitié-moitié fondue$34.99
CAT eService
No in-app purchases









