# Shiftin vs Spaced Repetition by Spacey

The clearest difference is in-app purchases: Shiftin at none against Spaced Repetition by Spacey's 4. Shiftin also leads on iOS requirement (13.0 vs 16.0). Spaced Repetition by Spacey's advantage is update cadence (every 5 weeks vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Spaced Repetition by Spacey sells 4 in-app purchases, starting at $3.99 per month. Shiftin asks for nothing beyond the download.

Shiftin ships an update every 5 months, Spaced Repetition by Spacey every 5 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Shiftin | Spaced Repetition by Spacey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/spaced-repetition-by-spacey/id6469460485/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 5 weeks** |
| Monetization | — | Freemium |
| Size | 47 MB | 28 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Smart ID Dynamics S.A.](https://appshunter.io/developer/1109320496) | [Hubert Sosnicki](https://appshunter.io/developer/1712016039) |

## What reviewers say

### Shiftin

[App page](https://appshunter.io/ios/app/shiftin/id1624650060)

**Features:** macOS Compatibility

**In-app purchases:** none


### Spaced Repetition by Spacey

[App page](https://appshunter.io/ios/app/spaced-repetition-by-spacey/id6469460485)

This study companion helps you plan, track, and optimize your learning sessions. It utilizes scientifically-proven spaced repetition techniques and allows you to organize study material into custom categories. Choose from flexible study plans to suit your needs and enhance memory retention.

**Highlights:** Spaced Repetition for memory retention, Customizable study categories, Flexible study plan options, Personalized study companion, Track and optimize study sessions

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Annual | $29.99 | per year |
| Lifetime | $24.99 | one-time |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Shiftin free?

Shiftin is free to download, with no in-app purchases.

### Is Spaced Repetition by Spacey free?

Spaced Repetition by Spacey is free to download, with in-app purchases available.

### Do Shiftin or Spaced Repetition by Spacey have ads?

Neither Shiftin nor Spaced Repetition by Spacey shows ads.

### Which is updated more often, Shiftin or Spaced Repetition by Spacey?

Shiftin ships an update every 5 months, and Spaced Repetition by Spacey every 5 weeks. Most recently, Shiftin was updated on November 3, 2026 and Spaced Repetition by Spacey on November 3, 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.*