Softwr

Publishing · head to head

Kindle vs Sigil

Kindle logo

Kindle

Publishing

Amazon's consumer e-book reading app, distinct from Kindle Direct Publishing, the author-facing service

From
Free
Rated
-
Full reviewWebsite
Sigil logo

Sigil

Publishing

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Kindle purchased e-books are DRM-protected and tied to an Amazon account by default, so a Kindle library is not portable to another platform's app without stripping protection through third party tools.; Sigil it produces no print output whatever, so any book that needs a paperback interior requires a completely separate tool and a second workflow.
  • They diverge on capability: Kindle covers E-book reading, Sigil covers Direct EPUB editing.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Kindle and Sigil actually diverge.

Attributes where Kindle and Sigil differ
AttributeKindleSigil
Pricing modelFree app, revenue from book purchases and optional subscriptionOpen source, no licence fee
PlatformsiOS, Android, WebWindows, macOS, Linux

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

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 Kindle

  • E-book reading
  • Whispersync
  • Audible integration
  • Offline downloads
  • Kindle Unlimited
  • X-Ray

Only in Sigil

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

What people use each for

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

Kindle

  • Reading e-books purchased from the Kindle Store across a phone, tablet and dedicated e-reader with synced positionnot Sigil
  • Switching between reading and audiobook listening on titles with Audible integrationnot Sigil
  • Subscribing to Kindle Unlimited for readers who consume many books from its included cataloguenot Sigil
  • Reading downloaded books offline while travelling without a data connectionnot Sigil

Sigil

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

Where each one falls short

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

Kindle

  • Purchased e-books are DRM-protected and tied to an Amazon account by default, so a Kindle library is not portable to another platform's app without stripping protection through third party tools.
  • Kindle Unlimited only includes a rotating subset of titles, not the full Kindle Store, so many popular or newly released books still require a separate purchase even with an active subscription.
  • Public library e-book lending through Kindle depends on library systems like Libby/OverDrive integration working correctly, and syncing issues between library loans and the Kindle app are a recurring user complaint.
  • Amazon can and has remotely removed purchased content from user accounts in rare disputed-rights cases, which is a real, if uncommon, risk of the DRM-locked model.
  • Reading on a phone or tablet inside the app lacks the e-ink glare-free reading experience of a dedicated Kindle device, which is a different purchase entirely.

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.

Pricing, plan by plan

Kindle

Free
  • Free appFree
    • Pay per book purchased, no subscription required
  • Kindle Unlimited$10.99/month
    • Access to a rotating catalogue of included e-books and audiobooks, not the full Kindle Store

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

Which should you pick?

Choose Kindle if

  • You need e-book reading.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want whispersync.
Kindle review

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

Questions people ask

Is Kindle or Sigil better?
Neither clearly leads. Kindle starts at Free and Sigil at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kindle or Sigil?
Kindle starts at Free and Sigil at Free.
Does Kindle or Sigil run on more platforms?
Kindle runs on iOS, Android, Web. Sigil runs on Windows, macOS, Linux.
Can I use Kindle for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kindle best used for?
Kindle is most often used for reading e-books purchased from the kindle store across a phone, tablet and dedicated e-reader with synced position, switching between reading and audiobook listening on titles with audible integration, subscribing to kindle unlimited for readers who consume many books from its included catalogue, reading downloaded books offline while travelling without a data connection. Of those, reading e-books purchased from the kindle store across a phone, tablet and dedicated e-reader with synced position and switching between reading and audiobook listening on titles with audible integration are not what Sigil is typically brought in for.
What can Kindle do that Sigil cannot?
Kindle covers E-book reading, Whispersync, Audible integration, Offline downloads. Sigil covers Direct EPUB editing, Code and preview views, EPUB 2 and EPUB 3, Regex across files.

Answered from the vendors’ own pages

Kindle: Is the Kindle app free?

Yes, the app itself is free; you pay for individual e-book and audiobook purchases, or optionally subscribe to Kindle Unlimited.

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.

Kindle: Can I read Kindle books on a non-Amazon device?

Somewhat; Kindle apps exist for most major platforms, but the books remain DRM-locked to your Amazon account rather than being a portable file format.

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.

Kindle: Is this the same as Kindle Direct Publishing?

No, Kindle Direct Publishing is the separate author-facing platform for publishing and selling books; this is the consumer reading app.

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.

Share

Related pages

More on Kindle

More on Sigil

Keep looking

Other head to heads