# On Top To vs Backlog by Time Engine

The clearest difference is price: Backlog by Time Engine at Free against On Top To's $1.99. Backlog by Time Engine also leads on update cadence (every 3 weeks vs every 3 months). On Top To's advantage is device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

Backlog by Time Engine is free to download; On Top To costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On Top To ships an update every 3 months, Backlog by Time Engine every 3 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | On Top To | Backlog by Time Engine |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/on-top-to-do/id1629536205/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 92.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 22 MB | 3 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Unsquander LLC](https://appshunter.io/developer/1626147066) | [100-8 Studio](https://appshunter.io/developer/1436780503) |

## What reviewers say

### On Top To

[App page](https://appshunter.io/ios/app/on-top-to-do/id1629536205)

This app helps you become a "list person" with a minimalist design and intuitive swipe interface for organizing and prioritizing tasks. It's designed for those who struggle with organization and procrastination, consolidating all your to-dos into a single list.

**Highlights:** Minimalist design, Intuitive swipe prioritization, Single master to-do list, Customizable task highlighting, Organize life and work

**Features:** macOS Compatibility

**In-app purchases:** none


### Backlog by Time Engine

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

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

**In-app purchases:** none


## Frequently asked questions

### Is On Top To free?

On Top To costs $1.99, with no in-app purchases.

### Is Backlog by Time Engine free?

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

### Do On Top To or Backlog by Time Engine have ads?

Neither On Top To nor Backlog by Time Engine shows ads.

### Which is updated more often, On Top To or Backlog by Time Engine?

On Top To ships an update every 3 months, and Backlog by Time Engine every 3 weeks. Most recently, On Top To was updated on November 3, 2026 and Backlog by Time Engine 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.*