# Calculator ∞ vs Audio Narrowband Filter

The clearest difference is in-app purchases: Audio Narrowband Filter at none against Calculator ∞'s 4. Calculator ∞'s advantage is chart position (#174 vs unranked). On price, ads, device support and iOS requirement there is nothing between them.

Calculator ∞ costs $5.99 and Audio Narrowband Filter $5.99 up front. Calculator ∞ sells 4 in-app purchases, starting at $3.49 per month. Audio Narrowband Filter asks for nothing beyond the download.

## The numbers

| Metric | Calculator ∞ | Audio Narrowband Filter |
| --- | --- | --- |
| Price | $5.99 | $5.99 |
| Rating | **[4.7 (6.3K ratings)](https://appshunter.io/ios/app/calculator/id458535809/reviews)** | — |
| Number of ratings | **6.3K** | — |
| Positive reviews | 74.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#174** | — |
| Size | 46 MB | 2 MB |
| Requires iOS | **12.1** | 13 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Incpt.Mobis](https://appshunter.io/developer/445261166) | [Real-Time Specialties](https://appshunter.io/developer/335568332) |

## What reviewers say

### Calculator ∞

[App page](https://appshunter.io/ios/app/calculator/id458535809)

**Currently charting:** #174 Top Paid · Education (US App Store)

This advanced calculator app offers a powerful math core and algebra engine for basic to complex calculations. It includes features like step-by-step solutions, handwriting recognition, and 2D graphing, making it suitable for students, engineers, and programmers.

**Highlights:** Step-by-step solution hints, Math Photos Solver, Handwriting Recognition, AI Math Problem Solver, 2D Graphing, Unit Converter, Matrix/Vector Mode

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited OCR/Writing 1 Month | $3.49 | per month |
| Unlimited OCR/Writing 3 Months | $8.99 | per 3 months |
| 400 AI Recognition & Queries | $0.99 | one-time |
| 900 AI Recognition & Queries | $1.99 | one-time |


### Audio Narrowband Filter

[App page](https://appshunter.io/ios/app/audio-narrowband-filter/id6748972323)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Calculator ∞ free?

Calculator ∞ costs $5.99, and also offers in-app purchases.

### Is Audio Narrowband Filter free?

Audio Narrowband Filter costs $5.99, with no in-app purchases.

### Do Calculator ∞ or Audio Narrowband Filter have ads?

Neither Calculator ∞ nor Audio Narrowband Filter shows ads.

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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.*