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Their book coach, rebuilt as a platform

Best Seller Publishing, Book publishing and author coaching.

Build

Client

Best Seller Publishing

Industry

Book publishing and author coaching

Service

Build

Timeline

Since Aug 2026

Stack

Next.js, Vercel, Supabase, OpenAI

Best Seller Publishing can now hand every author a guide that walks them from a blank page to a finished manuscript, and then turns that manuscript into a month of social posts.

What Kodeful did

Kodeful rebuilt the writing product from scratch as one platform, with Manny working inside the page instead of beside it. We then added a second module that turns a finished book into a month of social content in the author's own voice.

The problem

Best Seller Publishing helps founders and professionals write a book and use it to win clients. Writing was the slow part: authors stalled at the blank page, and the help they needed was spread across calls, documents and a writing tool the team had put together over time. The company already had an AI assistant its clients liked, called Manny, but he lived beside the writing instead of inside it. Rob Kosberg wanted one place where an author could start, be guided, and come out with a book.

Where they are now

The platform is in review with Rob and his team, and the social module is built. The next pieces are the migration of existing users and the plans the company will sell.

Rob Kosberg
The client

Rob Kosberg

Founder and CEO, Best Seller Publishing

Rob Kosberg is a Wall Street Journal and USA Today best-selling author and the founder of Best Seller Publishing. Through his Publish. Promote. Profit. program he helps experts, consultants and entrepreneurs write a best-selling book and use it to grow their business, and he has been featured on ABC, NBC, CBS and FOX.

Best Seller Publishing works with founders, coaches and professionals who want to publish a book and use it to win clients. The company sells a done-with-you package built around its own AI writing guide, Manny, and supports authors from the first idea through to the published book.

“Told a group about new Manny and the marketing feature and people were pumped”

Rob Kosberg

Founder and CEO, Best Seller Publishing

How Kodeful helped

What we built

One platform for the whole book: choosing a guide, a guided brief, bringing in the author's own material, a chapter outline, a writing editor with Manny on the page, a reader, PDF and Word export, plans and checkout, and a social module that plans posts from the finished book.

The product today

An author picks the kind of book they are writing, answers a set of questions about their reader and their experience, and can drop in their own material - channels, links or files - before a single chapter exists. Manny proposes the chapters, the author reshapes them, and then writes in an editor where Manny works on the page: select a sentence and he offers to shorten, expand, simplify, sharpen it or add a personal story. Nothing he suggests enters the book until the author accepts it. When the chapters are done the book can be read page by page and exported to PDF or Word.

Module 01

Your bookshelf

Every book the author has started, with how many chapters are written and when it was last touched, so picking up where they left off takes one click.

Your bookshelf
Module 02

Choose your Manny, then answer the questions

Three guides for three kinds of book - non-fiction, autobiography and faith story - each with its own method. The author then answers a short set of questions about their reader, their experience and the change they want to create, and those answers shape everything that follows.

Choose your Manny, then answer the questions
Module 03

The outline

Manny proposes the chapters from the brief and the author's own material. Every chapter can be renamed, reordered or removed before any writing starts.

The outline
Module 04

Writing with Manny on the page

The author writes on a clean page. Select any sentence and Manny offers to shorten, expand, simplify or sharpen it, or to turn it into a personal story, and the author can also ask for something in their own words. Nothing Manny suggests enters the book until it is accepted.

Writing with Manny on the page
Module 05

The finished book

The whole manuscript reads as a book: contents with page numbers, the cover, and how long it takes to read. The author always sees which chapters are still missing, and once the book is finished it exports to PDF or Word in one click.

The finished book
Module 06

From book to social content

The finished book becomes a month of posts. The author sets how often they post on each network, Manny plans the month from the book itself, and the accounts the author admires are used only to steer tone and format, never to borrow facts or phrases.

From book to social content
Before and after

What changed

BeforeAfter
What happens after the book is written The book was the end of the work The book becomes a month of planned posts, drafted in the author's own voice from their own chapters
Where the writing help sits The assistant lived beside the writing, as its own screens The assistant works on the page the author is typing on
Kodeful product delivery
Deliverables

What was delivered

Three guided paths for three kinds of book, each with its own method

A guided brief that turns the author's answers into the foundation of the book

The author's own material - channels, links or files - read once before writing starts, to shape the book and never to write it

A chapter outline the author can rename, reorder and edit before writing

A writing editor where the guide suggests on the page and nothing lands without the author accepting it

A book reader with PDF and Word export

A social module that plans a month of posts from the finished book, per network

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