# Backlog by Time Engine vs MemoryDock

The clearest difference is in-app purchases: Backlog by Time Engine at none against MemoryDock's 3. MemoryDock's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MemoryDock sells 3 in-app purchases, starting at $3.99 per month. Backlog by Time Engine asks for nothing beyond the download.

Backlog by Time Engine ships an update every 3 weeks, MemoryDock every 5 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Backlog by Time Engine | MemoryDock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 3 MB | 13 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [100-8 Studio](https://appshunter.io/developer/1436780503) | [FriendlyMiles Digital Ventures LLC](https://appshunter.io/developer/6800043498) |

## What reviewers say

### Backlog by Time Engine

[App page](https://appshunter.io/ios/app/backlog-by-time-engine/id6470202026)

**Features:** macOS Compatibility

**In-app purchases:** none


### MemoryDock

[App page](https://appshunter.io/ios/app/memorydock-notes-and-lists/id6800043496)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MemoryDock Monthly | $3.99 | per month |
| MemoryDock Yearly | $19.99 | per year |
| MemoryDock Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Backlog by Time Engine free?

Backlog by Time Engine is free to download, with no in-app purchases.

### Is MemoryDock free?

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

### Do Backlog by Time Engine or MemoryDock have ads?

Neither Backlog by Time Engine nor MemoryDock shows ads.

### Which is updated more often, Backlog by Time Engine or MemoryDock?

Backlog by Time Engine ships an update every 3 weeks, and MemoryDock every 5 days. Most recently, Backlog by Time Engine was updated on October 7, 2026 and MemoryDock on October 9, 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.*