
Letterbox
Goodreads
Trakt.tv
Simkl
Organize your books, movies, TV shows, games, and podcasts in one Kanban-style tracker. Drag items from backlog to completed. Custom lists for anything.

The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.

Website, pricing, platforms and company facts side by side.
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| Website | backlogbox.com | diffyn.com |
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| Company | Startup from the Netherlands · 1 - 9 employees · 2026 | — |
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In their own words, as submitted to SaaSHub.


BacklogBox is a media backlog tracker that combines book, movie, TV show, game, and podcast tracking into one app. Instead of juggling Goodreads, Letterboxd, Backloggd, and Trakt, you get a single Kanban board per media type.
No description of Diffyn yet.
What each product offers, as listed by its team.


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An editorial look at what each product does well and who it suits.


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The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing BacklogBox and Diffyn.
BacklogBox's answer
It is the only media tracker that covers books, movies, TV shows, games, and podcasts in a single app with Kanban boards. Instead of maintaining separate accounts on Goodreads, Letterboxd, Backloggd, and Trakt, everything lives in one place. You also get custom lists for tracking anything that does not fit the built-in types
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
BacklogBox's answer
Most media trackers only cover one type — Letterboxd for movies, Goodreads for books, Backloggd for games. If you consume multiple types of media, you end up with five different apps and no unified view. BacklogBox gives you one Kanban board per media type, auto-searches from TMDB, OpenLibrary, IGDB, and Apple Podcasts, and has a Discover page for finding new content across all categories.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
BacklogBox's answer
SvelteKit, TypeScript, PostgreSQL.
Diffyn's answer:
React, Next.js, POSTGRESQL
BacklogBox's answer
People who consume multiple types of media and want a single place to organize it. Readers who also game, movie watchers who also follow TV shows, anyone with a growing backlog across different media types who is tired of juggling separate apps or spreadsheets.
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
BacklogBox's answer
I was using Letterboxd for movies, Goodreads for books, Backloggd for games, and a spreadsheet for TV shows. Every time I finished something I had to remember which app to open. Half the time I just forgot. So I built one app to replace all of them.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
BacklogBox's answer
BacklogBox is an early-stage product for individual users. There are no enterprise customers — it is built for people who want to organize their personal media backlogs.
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9 letters, 60 seconds, ∞ words. Play real-time with friends
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Automatically track TV shows & movies you're watching.
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Simkl is a TV, anime, and movie tracker that keeps a history of all the shows and movies you watch in one, central location. It’s a mobile app, a website, Google Chrome extension to keep track of everything you watch and integrates with many TV apps
Compare Simkl to BacklogBox or Diffyn: