# FastCalc vs CAT eService

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.

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.

## The numbers

| Metric | FastCalc | CAT eService |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/fastcalc/id350419994/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **80.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 8 MB | 11 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andre Ponzo](https://appshunter.io/developer/350419997) | [NATIONAL TELECOM PUBLIC COMPANY LIMITED](https://appshunter.io/developer/852828800) |

## What reviewers say

### FastCalc

[App page](https://appshunter.io/ios/app/fastcalc/id350419994)

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.

**Highlights:** Large, practical keys, Permanent expression display, Automatic real-time results, Gesture-based input, Customizable constants, Advanced percentage mode

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Red Rivella | $1.99 | one-time |
| Homemade hot chocolate | $6.99 | one-time |
| Bircher muesli | $12.99 | one-time |
| Moitié-moitié fondue | $34.99 | one-time |


### CAT eService

[App page](https://appshunter.io/ios/app/cat-eservice/id1035684192)

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.

**Highlights:** Profile management, Usage history tracking, Online payment processing, Service addition/removal, News and promotions updates, Contact and support options

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FastCalc free?

FastCalc costs $1.99, and also offers in-app purchases.

### Is CAT eService free?

CAT eService is free to download, with no in-app purchases.

### Do FastCalc or CAT eService have ads?

Neither FastCalc nor CAT eService shows ads.

### Which is updated more often, FastCalc or CAT eService?

FastCalc ships an update every 5 months, and CAT eService every 6 months. Most recently, FastCalc was updated on October 7, 2026 and CAT eService on October 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*