# Calctan vs Message Keyword Filter

The clearest difference is price: Calctan at Free against Message Keyword Filter's $0.99. Calctan also leads on iOS requirement (16.6 vs 26.0). Message Keyword Filter's advantage is ads (none vs shown). On review sentiment, update cadence, in-app purchases and device support there is nothing between them.

Calctan is free to download; Message Keyword Filter costs $0.99 up front. Calctan sells 1 one-off in-app purchase and Message Keyword Filter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Calctan ships an update every 3 months, Message Keyword Filter every 2 months. The most recent releases landed on September 25, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Calctan | Message Keyword Filter |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.5 (61 ratings)](https://appshunter.io/ios/app/calctan/id1445480535/reviews)** | — |
| Number of ratings | **61** | — |
| Positive reviews | **28.6% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 11 MB | 15 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jorge Lozada](https://appshunter.io/developer/421852863) | [Planeta Pigra Co., Ltd.](https://appshunter.io/developer/1738642017) |

## What reviewers say

### Calctan

[App page](https://appshunter.io/ios/app/calctan/id1445480535)

This sophisticated calculator app offers a minimalist design with advanced mathematical functions and extensive personalization options. It seamlessly syncs across devices and includes multitasking features for enhanced productivity.

**Highlights:** Intuitive minimalist design, 100+ customizable themes, 47 advanced mathematical functions, Automatic calculation history, iCloud sync across devices, Split Screen and Swipe Mode multitasking, Share calculations easily

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $9.99 | one-time |


### Message Keyword Filter

[App page](https://appshunter.io/ios/app/message-keyword-filter/id1672730162)

This utility helps manage SMS messages by filtering content based on keywords and senders. It utilizes iOS system extensions for secure, private message classification without data leakage.

**Highlights:** Keyword-based SMS filtering, Sender-specific filtering, Automatic message classification, Secure iOS system extensions, Privacy protection, Easy-to-use interface

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support developer | $2.99 | one-time |


## Frequently asked questions

### Is Calctan free?

Calctan is free to download, with in-app purchases available.

### Is Message Keyword Filter free?

Message Keyword Filter costs $0.99, and also offers in-app purchases.

### Do Calctan or Message Keyword Filter have ads?

Calctan shows ads; Message Keyword Filter does not.

### Which is updated more often, Calctan or Message Keyword Filter?

Calctan ships an update every 3 months, and Message Keyword Filter every 2 months. Most recently, Calctan was updated on September 25, 2026 and Message Keyword Filter on September 16, 2026.

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