# TestSTMemory vs AC Method for Factoring PRO

The clearest difference is update cadence: AC Method for Factoring PRO at every 3 weeks against TestSTMemory's every 13 months. AC Method for Factoring PRO also leads on device support (3 vs 1) and price ($1.99 vs $2.99). On ads, in-app purchases and iOS requirement there is nothing between them.

TestSTMemory costs $2.99 and AC Method for Factoring PRO $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

TestSTMemory ships an update every 13 months, AC Method for Factoring PRO every 3 weeks. The most recent releases landed on September 19, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | TestSTMemory | AC Method for Factoring PRO |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/ac-method-for-factoring-pro/id1500086470/reviews)** |
| Number of ratings | — | **6** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 2 MB | 179 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Viacheslav Romanenko](https://appshunter.io/developer/1046372418) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## What reviewers say

### TestSTMemory

[App page](https://appshunter.io/ios/app/teststmemory/id1358135078)

**Features:** Vision Pro support

**In-app purchases:** none


### AC Method for Factoring PRO

[App page](https://appshunter.io/ios/app/ac-method-for-factoring-pro/id1500086470)

This app helps users factor quadratic equations using the AC method. It requires entering three variables and provides a detailed, step-by-step solution. All calculations are saved in a history for easy access and sharing.

**Highlights:** AC method for factoring quadratics, Step-by-step solutions, Input history, Supports positive/negative numbers and decimals, Shareable final solutions, Input validation

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

**In-app purchases:** none


## Frequently asked questions

### Is TestSTMemory free?

TestSTMemory costs $2.99, with no in-app purchases.

### Is AC Method for Factoring PRO free?

AC Method for Factoring PRO costs $1.99, with no in-app purchases.

### Do TestSTMemory or AC Method for Factoring PRO have ads?

Neither TestSTMemory nor AC Method for Factoring PRO shows ads.

### Which is updated more often, TestSTMemory or AC Method for Factoring PRO?

TestSTMemory ships an update every 13 months, and AC Method for Factoring PRO every 3 weeks. Most recently, TestSTMemory was updated on September 19, 2026 and AC Method for Factoring PRO on September 14, 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.*