# Partial Sums Addition vs Audio Flash

Partial Sums Addition and Audio Flash both sit at 5.0 stars, but that hides the real split: 100% of Audio Flash's written reviews are positive against 50% of Partial Sums Addition's. Audio Flash also leads on price (Free vs $3.99) and update cadence (every 10 days vs every 9 months). Partial Sums Addition's advantage is in-app purchases (none vs 2). On rating, ads, device support and iOS requirement there is nothing between them.

Audio Flash is free to download; Partial Sums Addition costs $3.99 up front. Audio Flash sells 2 in-app purchases, starting at $0.99 per month. Partial Sums Addition asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Partial Sums Addition against 5.0 for Audio Flash. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews are what separate them: 50% of Partial Sums Addition's written reviews are positive against 100% of Audio Flash's.

Partial Sums Addition ships an update every 9 months, Audio Flash every 10 days. The most recent releases landed on October 12, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Partial Sums Addition | Audio Flash |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/partial-sums-addition/id351022022/reviews) | [5.0 (6 ratings)](https://appshunter.io/ios/app/audio-flash/id6744666568/reviews) |
| Number of ratings | 2 | **6** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 5 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Esa Helttula](https://appshunter.io/developer/339440196) | [Tim Cronshaw](https://appshunter.io/developer/1786825403) |

## What reviewers say

### Partial Sums Addition

[App page](https://appshunter.io/ios/app/partial-sums-addition/id351022022)

This app teaches and reinforces the partial sums addition method. It offers an interactive interface with customizable settings, allowing users to solve random or custom addition problems with varying numbers of digits and addends. The app provides immediate feedback and aligns numbers automatically for focused learning.

**Highlights:** Partial sums addition method teaching, Interactive and customizable interface, Random and custom addition problems, Adjustable number of digits and addends, Automatic number alignment, Immediate feedback on answers, Color and animation speed customization

**Features:** macOS Compatibility

**In-app purchases:** none


### Audio Flash

[App page](https://appshunter.io/ios/app/audio-flash/id6744666568)

This app offers a hands-free, audio-only flashcard experience for efficient studying. It supports Anki imports, spaced repetition, and voice recognition for answering. Ideal for learning languages, medical terms, or vocabulary without screen time.

**Highlights:** Hands-free audio flashcards, Anki deck import, Spaced repetition (FSRS), Voice recognition for answers, Text-to-speech for flashcards, Screen-free learning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essential Access | $0.99 | per month |
| Unlimited Access | $1.99 | per month |


## Frequently asked questions

### Is Partial Sums Addition free?

Partial Sums Addition costs $3.99, with no in-app purchases.

### Is Audio Flash free?

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

### Which has better reviews, Partial Sums Addition or Audio Flash?

Partial Sums Addition and Audio Flash are both rated 5.0 out of 5 on the App Store, from 2 and 6 ratings respectively.

### Do Partial Sums Addition or Audio Flash have ads?

Neither Partial Sums Addition nor Audio Flash shows ads.

### Which is updated more often, Partial Sums Addition or Audio Flash?

Partial Sums Addition ships an update every 9 months, and Audio Flash every 10 days. Most recently, Partial Sums Addition was updated on October 12, 2026 and Audio Flash on September 21, 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.*