# Partial Sums Addition vs Back in Time

The clearest difference is review sentiment: Back in Time at 84% against Partial Sums Addition's 50%. Back in Time also leads on ratings volume (25 vs 2). Partial Sums Addition's advantage is rating (5.0 vs 4.6) and price ($3.99 vs $7.99). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Partial Sums Addition costs $3.99 and Back in Time $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Partial Sums Addition holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Back in Time has 25 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 50% of Partial Sums Addition's written reviews are positive against 84% of Back in Time's, so the app with the better star average is not the one people write more warmly about.

Partial Sums Addition ships an update every 9 months, Back in Time every 7 months. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Partial Sums Addition | Back in Time |
| --- | --- | --- |
| Price | **$3.99** | $7.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/partial-sums-addition/id351022022/reviews)** | [4.6 (25 ratings)](https://appshunter.io/ios/app/back-in-time/id450345693/reviews) |
| Number of ratings | 2 | **25** |
| Positive reviews | 50.0% of reviews | **83.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 7 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 836 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Esa Helttula](https://appshunter.io/developer/339440196) | [Landka](https://appshunter.io/developer/450345696) |

## 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


### Back in Time

[App page](https://appshunter.io/ios/app/back-in-time/id450345693)

Explore the history of the Universe, Earth, Life, and Civilization through an immersive, interactive journey. This app uses custom animations, timelines, and interesting facts to bring historical events to life. It's designed to help users understand the connections between events and see the bigger picture.

**Highlights:** Interactive timeline of events, Custom animations and videos, Over 350 remarkable images, Little-known interesting facts, Offline access, Multilingual support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Partial Sums Addition free?

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

### Is Back in Time free?

Back in Time costs $7.99, with no in-app purchases.

### Which has better reviews, Partial Sums Addition or Back in Time?

Partial Sums Addition is rated higher. Partial Sums Addition averages 5.0 out of 5 from 2 ratings, while Back in Time averages 4.6 from 25 ratings.

### Do Partial Sums Addition or Back in Time have ads?

Neither Partial Sums Addition nor Back in Time shows ads.

### Which is updated more often, Partial Sums Addition or Back in Time?

Partial Sums Addition ships an update every 9 months, and Back in Time every 7 months. Most recently, Partial Sums Addition was updated on October 12, 2026 and Back in Time on October 7, 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.*