# MiaoPiano vs Calculate 84 AI

The clearest difference is iOS requirement: MiaoPiano at 15.0 against Calculate 84 AI's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. MiaoPiano sells 3 in-app purchases, starting at $2.99 per month and Calculate 84 AI sells 7 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

MiaoPiano ships an update every 3 weeks, Calculate 84 AI fortnightly. The most recent releases landed on October 27, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | MiaoPiano | Calculate 84 AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (42 ratings)](https://appshunter.io/ios/app/calculate-84-ai/id6670720231/reviews)** |
| Number of ratings | — | **42** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 99 MB | 65 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hoang Viet](https://appshunter.io/developer/1752353160) | [Fredinax Graphing Calculator](https://appshunter.io/developer/1767217696) |

## What reviewers say

### MiaoPiano

[App page](https://appshunter.io/ios/app/miaopiano/id6504453281)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MiaoPiano 1 month subscription | $2.99 | per month |
| MiaoPiano 1 year subscription | $29.99 | per year |
| Life Time Access | $99.99 | one-time |


### Calculate 84 AI

[App page](https://appshunter.io/ios/app/calculate-84-ai/id6670720231)

This AI-powered graphing calculator offers step-by-step guidance for complex math problems, from pre-algebra to calculus. It features interactive graphing, matrix operations, and statistical tools, making learning math intuitive and efficient.

**Highlights:** AI-guided step-by-step solutions, Comprehensive math coverage (Pre-Algebra to Calculus), Interactive and dynamic graphing, Matrix and statistical calculations, Scrollable calculation history, Fraction and angle conversion support

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculate AI PRO - Monthly | $1.99 | per month |
| Calculate AI PRO - Monthly | $1.99 | per month |
| Calculate AI PRO - Monthly | $3.99 | per month |
| Calculate AI PRO - Yearly | $5.99 | per year |
| Calculate AI PRO - Yearly | $12.99 | per year |
| Calculate AI PRO - Yearly | $17.99 | per year |
| Calculate AI PRO - Yearly | $24.99 | per year |


## Frequently asked questions

### Is MiaoPiano free?

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

### Is Calculate 84 AI free?

Calculate 84 AI is free to download, with in-app purchases available.

### Do MiaoPiano or Calculate 84 AI have ads?

Neither MiaoPiano nor Calculate 84 AI shows ads.

### Which is updated more often, MiaoPiano or Calculate 84 AI?

MiaoPiano ships an update every 3 weeks, and Calculate 84 AI fortnightly. Most recently, MiaoPiano was updated on October 27, 2026 and Calculate 84 AI on November 4, 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.*