# Backlog by Time Engine vs idag

The clearest difference is in-app purchases: Backlog by Time Engine at none against idag's 3. idag'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. idag sells 3 in-app purchases, starting at $2.99 per 7 days. Backlog by Time Engine asks for nothing beyond the download.

Backlog by Time Engine ships an update every 3 weeks, idag every 5 days. The most recent releases landed on September 19, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | Backlog by Time Engine | idag |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 3 MB | 48 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [100-8 Studio](https://appshunter.io/developer/1436780503) | [mansour mahamat](https://appshunter.io/developer/1729020249) |

## 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


### idag

[App page](https://appshunter.io/ios/app/idag-focus-and-task-manager/id6737172470)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium weekly | $2.99 | per 7 days |
| Premium Month | $4.99 | per month |
| Premium Year | $39.99 | per year |


## Frequently asked questions

### Is Backlog by Time Engine free?

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

### Is idag free?

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

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

Neither Backlog by Time Engine nor idag shows ads.

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

Backlog by Time Engine ships an update every 3 weeks, and idag every 5 days. Most recently, Backlog by Time Engine was updated on September 19, 2026 and idag on May 17, 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.*