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Publishing · head to head

Sigil vs UnoPIM

Sigil logo

Sigil

Publishing

Open source EPUB editor for working directly on the file, not generating it

From
Free
Rated
-
Full reviewWebsite
UnoPIM logo

UnoPIM

E-Commerce

Automate and scale your product data with an AI-powered open-source PIM.

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Sigil it produces no print output whatever, so any book that needs a paperback interior requires a completely separate tool and a second workflow.; UnoPIM self-hosted. There is no vendor-run cloud option, so somebody has to run PHP 8.4, a supported MariaDB, MySQL or PostgreSQL, and keep them patched.
  • They diverge on capability: Sigil covers Direct EPUB editing, UnoPIM covers Product Infromation Management System.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which Sigil and UnoPIM actually diverge.

Attributes where Sigil and UnoPIM differ
AttributeSigilUnoPIM
Pricing modelOpen source, no licence feeopen-source
PlatformsWindows, macOS, Linuxweb, linux
CategoryPublishingE-Commerce
FoundedUnknown2024

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Sigil

  • Direct EPUB editing
  • Code and preview views
  • EPUB 2 and EPUB 3
  • Regex across files
  • Validation
  • Python plugins

Only in UnoPIM

  • Product Infromation Management System
  • Digital Asset Management
  • Enterprise-Scale Performance
  • Bulk Import/Export (CSV & XLSX)
  • Multi-Channel & Multi-Language Distribution

What people use each for

The jobs each tool is most often brought in to do.

Sigil

  • Fixing an EPUB that a retailer validator has rejected, without re-exporting from the tool that generated itnot UnoPIM
  • Correcting the table of contents, reading order or metadata in a file supplied by a conversion servicenot UnoPIM
  • Preparing a back-catalogue title where the only surviving source is the EPUB itselfnot UnoPIM
  • Applying a consistent stylesheet or a bulk text correction across every chapter of a book at oncenot UnoPIM

UnoPIM

  • Centralising product data across multiple sales channelsnot Sigil
  • Enriching catalogue attributes before a channel launchnot Sigil
  • Migrating a large catalogue between e-commerce platformsnot Sigil
  • Managing product copy and assets in multiple languagesnot Sigil
  • Publishing consistent product data to marketplaces and storefrontsnot Sigil

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Sigil

  • It produces no print output whatever, so any book that needs a paperback interior requires a completely separate tool and a second workflow.
  • Meaningful use requires reading and writing HTML and CSS, which puts it out of reach of most authors who simply want a finished file.
  • There is no cloud storage, sync or collaboration, so the book exists as a file on one machine and version control is whatever you set up yourself.
  • Development depends on a small number of volunteer maintainers, so release timing and platform builds follow their availability rather than a roadmap, and a lapse in maintenance would leave no obvious successor.
  • It provides no distribution, no retailer connection and no Kindle-native output, so it sits in the middle of a workflow that other tools have to complete on both sides.

UnoPIM

  • Self-hosted. There is no vendor-run cloud option, so somebody has to run PHP 8.4, a supported MariaDB, MySQL or PostgreSQL, and keep them patched.
  • The stack is specific and recent. Laravel 13 on PHP 8.4.1 or newer rules out shared hosting and older managed PHP environments.
  • Younger than the established PIM tools it competes with, first released in 2024, so there is less third-party tooling and a smaller pool of implementers.
  • Support is community-driven unless you buy it from Webkul. The MIT licence carries no SLA.
  • The AI content generation and AI agent chat depend on third-party model providers you supply and pay for separately.

Pricing, plan by plan

Sigil

Free
  • SigilFree
    • GPL licensed with no cost or account required
    • Full functionality with no feature gating
    • Community support through forums and the issue tracker

UnoPIM

Free
  • Open Source$undefined/month
    • Unlimited projects
    • Advanced analytics
    • API access

Which should you pick?

Choose Sigil if

  • You need direct epub editing.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want code and preview views.
Sigil review

Choose UnoPIM if

  • You need product infromation management system.
  • You want to start without paying.
  • You work on web, linux.
  • You also want digital asset management.
UnoPIM review

Questions people ask

Is Sigil or UnoPIM better?
Neither clearly leads. Sigil starts at Free and UnoPIM at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Sigil or UnoPIM?
Sigil starts at Free and UnoPIM at Free.
Does Sigil or UnoPIM run on more platforms?
Sigil runs on Windows, macOS, Linux. UnoPIM runs on web, linux.
Can I use Sigil for free?
Both have a free tier, so you can try either at no cost before committing.
What is Sigil best used for?
Sigil is most often used for fixing an epub that a retailer validator has rejected, without re-exporting from the tool that generated it, correcting the table of contents, reading order or metadata in a file supplied by a conversion service, preparing a back-catalogue title where the only surviving source is the epub itself, applying a consistent stylesheet or a bulk text correction across every chapter of a book at once. Of those, fixing an epub that a retailer validator has rejected, without re-exporting from the tool that generated it and correcting the table of contents, reading order or metadata in a file supplied by a conversion service are not what UnoPIM is typically brought in for.
What can Sigil do that UnoPIM cannot?
Sigil covers Direct EPUB editing, Code and preview views, EPUB 2 and EPUB 3, Regex across files. UnoPIM covers Product Infromation Management System, Digital Asset Management, Enterprise-Scale Performance, Bulk Import/Export (CSV & XLSX).

Answered from the vendors’ own pages

Sigil: Can I write my book in Sigil?

You can, but you should not. It is an EPUB editor, not a word processor, and writing long-form prose in it is unpleasant. Write elsewhere, import, then finish in Sigil.

UnoPIM: Is UnoPIM really free?

Yes. UnoPIM is released under the MIT licence and the source is on GitHub, so there is no licence fee and no seat cost. What you pay for is hosting, and optionally Webkul's commercial support and implementation services.

Source
Sigil: Does it make Kindle files?

Not natively. Produce a valid EPUB in Sigil and let Amazon convert it, or use a separate conversion tool for other Kindle formats.

UnoPIM: What does UnoPIM need to run?

Laravel 13 on PHP 8.4.1 or newer, with MariaDB 10.11 LTS or 11.8 LTS, MySQL 8.0.32 or newer, or PostgreSQL 16. Node 22 LTS is recommended for building assets.

Source
Sigil: Is it safe to rely on a volunteer project for commercial work?

The files it produces are standard EPUB, so nothing is locked in. The risk is that maintenance stops, not that your books become unreadable.

UnoPIM: How many products can UnoPIM handle?

The project states it is built to manage, enrich and scale product data beyond 10 million products, with performance tuning aimed at high-volume catalogues.

Source
UnoPIM: Who maintains UnoPIM?

Webkul, an e-commerce software company based in Noida, India. The project is open source with an active community and has passed 11,000 GitHub stars.

Source
UnoPIM: Does UnoPIM include digital asset management?

Yes. Images, videos and documents are stored and organised alongside product data with metadata tagging, rather than needing a separate DAM.

Source
UnoPIM: What AI features does it include?

An AI agent chat for managing products conversationally, and AI content generation with support for more than ten model providers. You supply and pay for the provider.

Source
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