# Deadline Backsolve: Planner — Writing & comic page tracker

> Calculates project shortfall and suggests concrete adjustments to meet deadlines. (iPhone/iPad app by Daisuke Yamaguchi.)

- Source: https://appshunter.io/ios/app/deadline-backsolve-planner/id6796252958 (this page in markdown: same URL + `.md`)
- Developer: [Daisuke Yamaguchi](https://appshunter.io/developer/880950899)
- Category: Productivity, Lifestyle
- Price: $0.99
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Chinese (Traditional, Taiwan)
- Released: 2026-08-04
- Data updated: 2026-10-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/deadline-backsolve-planner/id6796252958/reviews.md

## What is Deadline Backsolve?

When you realize you won't hit the deadline, what you actually need is the answer to "so what do I change?"

Deadline Backsolve computes the shortfall and gives you concrete fixes: "push the deadline 3 days", "add 45 minutes per working day", "cut 4 pages". Real numbers, not a warning label.

■ Three inputs. Thirty seconds.
What, how much, by when. That's the whole setup. Stages and per-weekday hours can wait until later.

■ Split the work into stages (new in 1.4)
Thumbnails → pencils → inks → finishing, or outline → first draft → revision. Give each stage its share of the time per page, and the Today screen tells you exactly what to do: "Pencils 6 pages → then Inks 2 pages". The project screen shows each stage's progress. Stages are optional, and recovery plans keep working as before.

■ You only look at today
The home screen says "Today: 8 pages." That's it. No Gantt charts, no dense tables. Tap "+1 page" when you're done.

■ It follows your real week
One hour on weekdays, three on weekends? Your quota is distributed by the time you actually have.

■ It learns your real pace
It starts from an estimate, then switches to your measured minutes per page once you have logged enough work.

■ Recovery plans, computed
- Switch to a later registered deadline (with hours gained)
- Extend the deadline by N days
- Add N minutes per working day
- Cut N units
- Finish each unit within N minutes
- Open up a day you had marked as rest
Tap any of them to apply it to the plan immediately.

■ A focus timer that survives a crash
It stores the start time, so closing the app never loses your session. It never plays a sound effect.

■ Your entries stay on your device
No account. No ads. What you enter never leaves your device. To improve the app, only anonymous usage data (such as which screens are opened) is counted with Google Analytics (you can turn this off in Settings). Move it with a JSON export/import when you change phones.

■ One-time purchase. No add-ons.
Everything is unlocked at purchase. Unlimited projects and logs. No subscription.

■ Available in English, Japanese, German, French, Korean and Traditional Chinese.

Works for comics, novels, illustration books and merch, but also for articles, reports and theses — anything with an amount and a due date. Name the unit whatever you like.

## Key features

- 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

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/deadline-backsolve-planner/id6796252958/reviews.md

### 5/5 — 締め切りに追われる人の救世主

*2026-08-08*

締切までに「今日はどれくらい進めればいいか」が分かるので、作業がかなり楽になりました。原稿やレポート、仕事の資料作成など、締切がある作業を後回しにしがちな人にはぴったりです。

### 5/5 — いまの時代には必須

*2026-08-05*

これ、使ってるうちに進捗が見える化してきて、めっちゃいいです。計画たてるの苦手な人、逆にスケジュール詰まりすぎてわざわざパソコンカレンダー開いてる人とかオススメです。
道具箱っていうユーモアな仕掛けもあって…もはや捗るしかない、鬼だけどどこか母の温もりを感じられるような…そんなアプリ＾＾w

「頑張ってんな自分」を感じたい人にもオススメ。やる気でる。

## Frequently asked questions about Deadline Backsolve

### What is the primary function of Deadline Backsolve?

Deadline Backsolve helps users adjust their project plans when they realize they might miss a deadline. It computes the shortfall and provides concrete, actionable fixes to get back on track.

### Does Deadline Backsolve have an English interface?

No, the app interface is currently in Japanese only. While the App Store listing is in English, the application itself has not yet been localized for English users.

### How does Deadline Backsolve handle user data and privacy?

Deadline Backsolve operates entirely offline with no account, server, ads, or tracking. Your data is stored locally on the device and can be moved using JSON export/import.

### What are the pricing details for Deadline Backsolve?

Deadline Backsolve is a one-time purchase for $0.99. There are no add-ons or subscriptions, and everything is unlocked at the time of purchase.

### How often is Deadline Backsolve updated?

The app was last updated on August 8, 2026, with version 1.2. This indicates a recent update, suggesting ongoing development and support.

### What types of projects is Deadline Backsolve suitable for?

It's versatile for anything with an amount and a due date, including comics, novels, illustration books, merchandise, articles, reports, and theses. Users can name their units as needed.

### Does Deadline Backsolve have ads?

No, Deadline Backsolve does not have ads. It is designed to be completely ad-free, ensuring an uninterrupted user experience.

### What devices is Deadline Backsolve compatible with?

Deadline Backsolve is available for iPhone and iPad devices, as indicated by its supported devices list.

## Version history (last 5 releases)

### 1.5 — 2026-09-30

■ Anonymous usage statistics
To improve the app, it now counts which screens are opened and which features are used, anonymously. Nothing you type (titles, amounts) is sent, and no advertising ID is used.
You can turn this off at any time in Settings → "Share anonymous usage data".

### 1.4 — 2026-09-27

■ Stages
Split each page of work into stages such as thumbnails → pencils → inks → finishing.
- Today shows how much of each stage to do, e.g. "Pencils 6 pages → then Inks 2 pages"
- The project screen shows each stage's progress and where you are now
- Pick the stage when you log (defaults to the current one)
- Projects without stages work exactly as before
Turn it on under "Stages (optional)" when editing a project.

■ The app is now available in English, German, French, Korean and Traditional Chinese.

■ Small fixes to the "Our other apps" text.

### 1.3 — 2026-08-27

• Added "Our other apps" in Settings, so you can see what else we make. The App Store opens inside the app, so you never lose your place.

• Added a gentle streak reminder. It learns roughly when you usually finish and sends at most one nudge a day. Nothing is sent once you're done for the day, and if you stop opening the app for a while, it quiets itself. You can turn it off in Settings.

### 1.2.1 — 2026-08-12

One display fix.

When a single page (or unit) takes longer than the time you have
today, the numbers looked contradictory — for example
"Today: 2 pages / est. 10 hours / available today 3 hours".

The app now explains why, in one line:
"One page (5 hours) does not fit in today's available time."

The calculation itself is unchanged.

### 1.2 — 2026-08-08

Fixes for issues you reported.

Notifications
- Reminders now appear while the app is open (they did not before).
- If notifications are not permitted, the app says so instead of failing silently.
- It now shows when the next reminder will arrive.
- Settings has a new "Send a test now" button.
- The reminder text is rebuilt each time you open the app, so it no longer goes stale.

New manuscript settings
- Fixed numbers being lost when you tapped Save while still typing.
- Added a Done button to the number keyboard.
- Changing the type no longer overwrites an amount, unit or duration you entered.
- Switching to per-weekday hours now carries over the hours you already set.
- Early/late deadlines are put back in order on save if they were reversed.

Toolbox
- Added a section for other apps by the same developer.

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## More apps by Daisuke Yamaguchi

- [チャット分析 for LINE](https://appshunter.io/ios/app/for-line/id880950896)
- [ぱすてるオセロ](https://appshunter.io/ios/app/id6793739141)
- [起業おじさん](https://appshunter.io/ios/app/id6795361615)
- [禁酒ウォッチ｜断酒・休肝日カウンター](https://appshunter.io/ios/app/id6795822272)
- [Tsuzuku: Habit Tracker & ToDo](https://appshunter.io/ios/app/tsuzuku-habit-tracker-and-todo/id6796174701)
- [Solo Invoice - Invoice Maker](https://appshunter.io/ios/app/solo-invoice-invoice-maker/id6796195340)

All apps by Daisuke Yamaguchi: https://appshunter.io/developer/880950899

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-06.*