Comparison

SFD vs INK.BOOK

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SFD

This app helps you overcome writer's block by forcing you to write a first draft without the ability to edit or reread. It uses timed bursts and nudges to keep you moving forward, allowing you to flag sections for later revision.

Highlights
  • Forward-only writing
  • Timed writing bursts
  • Cursor nudges for stalls
  • Flagging sections for revision
  • Plain text export
  • Offline functionality
Features
Read full description

Writing apps help with the easy half — outlines, fonts, folders, word-count trophies. The hard half is producing a bad first version of something, and that's all SFD does. SFD is forward-only. You write in a burst, the earlier lines dim and scroll away, and you can't go back to fix them. You can't edit a draft into existence, so SFD won't let you try until it's out. How it works: — A go is a timed burst. You write. You don't reread. — Stall for a few seconds and you get a shove — a nudge that gets blunter the longer you stare at the cursor. — Hit a line you hate? Drop a later and keep moving. Your flags become a punch-list for when you revise. — A finished part is a chunk. A stack of chunks is the Pile — your whole first draft. — When it's done, send it out as plain text, to wherever you actually revise. Drafting is free. Every go, every later, every export — no account, no trial clock, no nagging. THE BIG MONTH is free too: 50,000 words of a novel's first draft between November 1 and 30. SFD shows your words today and how many a day finishes it, lights up a November calendar on every day you write, marks 10,000, 25,000 and 50,000, and gives you a BIG MONTH 2026 stamp and finisher card you can only earn that November. One thing costs money: SFD Habit Tracking, a 99-cent one-time unlock for the habit layer — the streak map and year wall, the month goal, the quiet reminder, stamps, share cards, and the home-screen widget, which carries THE BIG MONTH in November. The scoreboard, not the game. If you bought SFD back when the app itself cost money, the habit layer is yours automatically. What SFD won't do: format, outline, sync, collaborate, or write the draft for you. You write the bad version. A chunk has to get written; inside that, anything goes. Your words stay yours. Every chunk is a plain-text file on your device. No proprietary format, no servers. SFD makes no network calls at all — it can't lose your words and it can't trap them. Get the first draft out. You can make it good later, somewhere with a real keyboard.

About

INK.BOOK

Features
Read full description

Write your book the way it will be read: on two facing pages, like an open book. InkBook is a quiet, offline place for your stories. No account, no distractions. Your manuscript is saved automatically on your device. THE OPEN BOOK VIEW • Turn your iPad to landscape and two scenes sit side by side, like facing pages • Write on either page, and turn both pages forward or back together • On a foldable iPhone, the pages meet right at the fold, like the two halves of a real book • On iPhone, a single page keeps your focus on one scene A LIBRARY FOR YOUR MANUSCRIPTS • Every book gets its own cover card with a color you choose • Search your projects and see when each one was last edited • Add a title, author name and description to each book • Not sure where to start? Open the sample book and explore KNOW YOUR BOOK • Live word count while you write • Scenes, chapters and estimated reading time • Printed page count for the book size you pick: A5, 13.5 × 21 cm, 6 × 9 in or A4 • Words by chapter at a glance SHARE YOUR STORY • Export your book as a PDF that matches your book size • Or export it as plain text and take it anywhere MADE FOR iPHONE AND iPAD • On iPad, keep Contents, Book Details and Writing Statistics open in a sidebar • Keyboard shortcuts for moving between scenes, undo, redo and more • Light, dark or system theme • Available in English, Turkish and Spanish YOUR WORDS STAY YOURS InkBook works fully offline. Your projects never leave your device unless you export them, and an automatic backup keeps your library safe.

Screenshots

SFD4 screens
INK.BOOK4 screens

Verdict

The call

The clearest difference is in-app purchases: INK.BOOK at none against SFD's 1. On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SFD sells 1 one-off in-app purchase. INK.BOOK asks for nothing beyond the download.

UpkeepUpdate frequency

SFD ships an update every 8 days, INK.BOOK every 11 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard1 real difference · 9 level
SFD versus INK.BOOK: the parameters behind the verdict, then further details
ParameterSFDINK.BOOK
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 8 days — betterEvery 11 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size3 MB9 MB
Age rating4+4+
DeveloperDaniel James Kinney-SpearsYahya Gonder

In-app purchases

1 purchases

SFD

One-time1
  • SFD Habit Tracking$0.99
None

INK.BOOK

No in-app purchases

Questions

Is SFD free?
SFD is free to download, with in-app purchases available.
Is INK.BOOK free?
INK.BOOK is free to download, with no in-app purchases.
Do SFD or INK.BOOK have ads?
Neither SFD nor INK.BOOK shows ads.
Which is updated more often, SFD or INK.BOOK?
SFD ships an update every 8 days, and INK.BOOK every 11 days. Most recently, SFD was updated on October 25, 2026 and INK.BOOK on October 24, 2026.

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