Comparison

Calctan vs Message Keyword Filter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calctan

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
Read full description

Calctan is a sophisticated calculator app designed for iOS devices (iPhone and iPad), celebrated for its elegant, minimalist design and robust functionality that surpasses traditional calculators. Tailored for students, professionals in mathematics, physics, engineering, and anyone seeking a highly customizable and intuitive calculation tool, Calctan combines advanced mathematical capabilities with a seamless user experience. Its sleek interface and extensive personalization options make it both a practical tool and a visually appealing addition to your device. The app’s commitment to user-centric design is evident in its seamless integration with iOS ecosystems. With iCloud sync, your calculations and preferences are always up-to-date, whether you’re switching between devices or collaborating on the go. Features like Split Screen and Swipe Mode empower iPad users to maximize productivity, while the ability to share calculations fosters effortless communication. Calctan is more than a calculator—it’s a dynamic, adaptable tool that elevates your calculation experience with style, precision, and efficiency. Key Features: 1. Intuitive Design: Calctan’s clean, minimalistic interface prioritizes usability, presenting essential calculator elements in a clear, distraction-free layout that ensures effortless navigation and operation. 2. Personalized Interface: Choose from 100 pre-installed themes or craft a unique look with a custom color picker. Fine-tune button corner radius, spacing, and layout to optimize comfort and readability, allowing the app to reflect your personal style. 3. Advanced Math: Access 47 powerful functions, including trigonometric operations (sine, cosine, tangent, and their inverses), percentages for budgeting, exponents, logarithms (base-10, natural, base-2), and roots (square, cube). Switch between degrees and radians, compute factorials for permutations, or use absolute values and reciprocals—perfect for scientific, technical, and financial calculations. 4. Calculation History: Automatically saves and organizes your calculations, enabling you to revisit, edit, or reuse past results with ease, streamlining complex workflows. 5. iCloud Sync: Seamlessly syncs calculations and customizations across your iPhone and iPad, ensuring a consistent and cohesive experience across all your devices. 6. Multitasking Modes: - Split Screen Mode: On iPad, use Calctan alongside another app, such as performing calculations while referencing a document or spreadsheet. - Swipe Mode: Access a second app at the bottom of the screen while keeping Calctan active at the top, enhancing productivity for multitasking users. 7. Share Calculations: Share results effortlessly via email, text, or other apps, making collaboration and communication quick and convenient. Additional Highlights: • Library of basic mathematical constants • Random color theme generator for creative inspiration • Engaging sounds and animations for a dynamic user experience • Adjustable decimal places, currency symbols, and thousands separators • Dark Mode support for comfortable use in low-light environments • Comprehensive settings menu for full control over app preferences • Detailed user manual for easy onboarding and reference

About

Message Keyword Filter

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
Read full description

Are you looking for a simple and secure tool for classifying and filtering SMS messages? You can add keywords and senders according to your needs, and SMS messages containing specified keywords will be automatically classified and filtered based on your settings. The app uses iOS system extensions to securely identify the content of SMS messages and protect your privacy, with no risk of any data leakage. The app is easy to use, secure, and protects your personal privacy while helping you manage your SMS messages with ease.

Screenshots

Calctan4 screens
Message Keyword Filter4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Calctan versus Message Keyword Filter: the parameters behind the verdict, then further details
ParameterCalctanMessage Keyword Filter
PriceFree — better$0.99
Rating4.5 (61 ratings) — better—
Positive reviews28.6% of reviews — better25.0% of reviews
Number of ratings61 — better—
Update frequencyEvery 3 monthsEvery 2 months — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad — betteriPhone
Requires iOS16.6 — better26.0
Further details — not scored
Size11 MB15 MB
Age rating4+4+
DeveloperJorge LozadaPlaneta Pigra Co., Ltd.

Customer experience

Calctan

All ratings61 ratings
Positive88.5%
Neutral0.0%
Negative11.5%
Written reviews7 reviews
Positive28.6%
Neutral0.0%
Negative71.4%

Message Keyword Filter

Written reviews12 reviews
Positive25.0%
Neutral33.3%
Negative41.7%

In-app purchases

1 purchases

Calctan

One-time1
  • No Ads$9.99
1 purchases

Message Keyword Filter

One-time1
  • Support developer$2.99

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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