# Spaced Retrieval Therapy vs SEMG

The clearest difference is price: SEMG at Free against Spaced Retrieval Therapy's $9.99. Spaced Retrieval Therapy's advantage is device support (3 vs 1) and iOS requirement (9.0 vs 15.0). On update cadence, ads and in-app purchases there is nothing between them.

SEMG is free to download; Spaced Retrieval Therapy costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Spaced Retrieval Therapy ships an update every 18 months, SEMG every 12 months. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Spaced Retrieval Therapy | SEMG |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.7 (32 ratings)](https://appshunter.io/ios/app/spaced-retrieval-therapy/id498787795/reviews)** | — |
| Number of ratings | **32** | — |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 12 months** |
| Monetization | Paid | — |
| Size | 5 MB | 68 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 12+ |
| Developer | [Tactus Therapy Solutions Ltd.](https://appshunter.io/developer/438070002) | [Shenzhen XFT Medical Limited](https://appshunter.io/developer/645422367) |

## What reviewers say

### Spaced Retrieval Therapy

[App page](https://appshunter.io/ios/app/spaced-retrieval-therapy/id498787795)

This app uses a scientifically proven method to help individuals with memory impairments, such as dementia, recall important information. It acts as an interval timer, automatically adjusting prompt timing based on user responses to reinforce memory over time.

**Highlights:** Spaced retrieval training method, Automatic interval adjustment, Data tracking and reporting, Background operation, Subtle sound and visual prompts, Email finished reports

**In-app purchases:** none


### SEMG

[App page](https://appshunter.io/ios/app/semg-2003d/id1253746661)

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

**In-app purchases:** none


## Frequently asked questions

### Is Spaced Retrieval Therapy free?

Spaced Retrieval Therapy costs $9.99, with no in-app purchases.

### Is SEMG free?

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

### Do Spaced Retrieval Therapy or SEMG have ads?

Neither Spaced Retrieval Therapy nor SEMG shows ads.

### Which is updated more often, Spaced Retrieval Therapy or SEMG?

Spaced Retrieval Therapy ships an update every 18 months, and SEMG every 12 months. Most recently, Spaced Retrieval Therapy was updated on November 3, 2026 and SEMG on November 2, 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.*