# TodoKnock vs Deadline Backsolve

The clearest difference is price: TodoKnock at Free against Deadline Backsolve's $0.99. Deadline Backsolve's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

TodoKnock is free to download; Deadline Backsolve costs $0.99 up front. TodoKnock sells 1 one-off in-app purchase. Deadline Backsolve asks for nothing beyond the download.

TodoKnock ships an update every 6 days, Deadline Backsolve every 4 days. Both last shipped on October 6, 2026.

## The numbers

| Metric | TodoKnock | Deadline Backsolve |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 4 days** |
| Monetization | — | Paid |
| Size | 56 MB | 4 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuichi Sasaki](https://appshunter.io/developer/1831654051) | [Daisuke Yamaguchi](https://appshunter.io/developer/880950899) |

## What reviewers say

### TodoKnock

[App page](https://appshunter.io/ios/app/todoknock-count-your-progress/id6755919383)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Deadline Backsolve

[App page](https://appshunter.io/ios/app/deadline-backsolve-planner/id6796252958)

This app helps you adjust project plans when deadlines are at risk. It calculates the shortfall and suggests concrete adjustments like extending deadlines or reducing scope. The interface is currently in Japanese only.

**Highlights:** Calculates shortfall and suggests fixes, Adjusts plans based on available time, Learns user's real work pace, Offers recovery plan options, Focus timer that survives crashes, Offline functionality, JSON export/import for data transfer

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

**In-app purchases:** none


## Frequently asked questions

### Is TodoKnock free?

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

### Is Deadline Backsolve free?

Deadline Backsolve costs $0.99, with no in-app purchases.

### Do TodoKnock or Deadline Backsolve have ads?

Neither TodoKnock nor Deadline Backsolve shows ads.

### Which is updated more often, TodoKnock or Deadline Backsolve?

TodoKnock ships an update every 6 days, and Deadline Backsolve every 4 days. Most recently, TodoKnock was updated on October 6, 2026 and Deadline Backsolve on October 6, 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.*