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Sigil vs Together AI

Sigil logo

Sigil

Publishing

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

From
Free
Rated
-
Full reviewWebsite
Together AI logo

Together AI

AI

Open-source AI at scale

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.; Together AI free tier limits not clearly specified in pricing documentation
  • They diverge on capability: Sigil covers Direct EPUB editing, Together AI covers Open-source models.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Sigil and Together AI actually diverge.

Attributes where Sigil and Together AI differ
AttributeSigilTogether AI
Pricing modelOpen source, no licence feeusage-based
PlatformsWindows, macOS, LinuxApi, Cloud
CategoryPublishingAI
FoundedUnknown2022

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 Together AI

  • Open-source models
  • Fine-tuning
  • Fast inference
  • Embeddings
  • REST API
  • Python SDK
  • OpenAI compatible
  • Api support

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 Together AI
  • Correcting the table of contents, reading order or metadata in a file supplied by a conversion servicenot Together AI
  • Preparing a back-catalogue title where the only surviving source is the EPUB itselfnot Together AI
  • Applying a consistent stylesheet or a bulk text correction across every chapter of a book at oncenot Together AI

Together AI

  • LLM inference for production AI applicationsnot Sigil
  • Content generation at scalenot Sigil
  • Code execution and embeddingsnot Sigil
  • Model fine-tuning and trainingnot Sigil
  • Startup and enterprise AI deploymentnot 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.

Together AI

  • Free tier limits not clearly specified in pricing documentation
  • Pricing varies significantly by model and use case
  • Requires account setup for production access
  • Batch API discounts apply only to non-urgent workloads

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

Together AI

Free
  • Serverless Inference$0.03/1M input tokens
    • Chat and Vision models
    • Image generation
    • Video generation
  • Provisioned Throughput$21600/month
    • Up to 83% savings vs commercial alternatives
    • Reserved capacity
    • Guaranteed throughput
  • Dedicated Inference$5.49/hour
    • H100 GPU instance
    • Single-tenant deployment
    • No resource sharing
  • GPU Clusters$3.99/GPU-hour
    • On-demand capacity
    • Volume discounts available
    • Reserved options with up to 35% savings

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 Together AI if

  • You need open-source models.
  • You want to start without paying.
  • You work on Api, Cloud.
  • You also want fine-tuning.
Together AI review

Questions people ask

Is Sigil or Together AI better?
Neither clearly leads. Sigil starts at Free and Together AI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Sigil or Together AI?
Sigil starts at Free and Together AI at Free.
Does Sigil or Together AI run on more platforms?
Sigil runs on Windows, macOS, Linux. Together AI runs on Api, Cloud.
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 Together AI is typically brought in for.
What can Sigil do that Together AI cannot?
Sigil covers Direct EPUB editing, Code and preview views, EPUB 2 and EPUB 3, Regex across files. Together AI covers Open-source models, Fine-tuning, Fast inference, Embeddings.

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.

Together AI: Does Together AI offer a free tier?

Yes, Together AI advertises 'Start for free, scale on demand,' but specific free tier usage limits are not detailed on the pricing page.

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.

Together AI: What are Together AI's highest model prices?

Serverless inference pricing ranges from free for base models up to $4.40 per 1M input tokens for premium models. Video generation costs $0.14 to $3.20 per video depending on resolution.

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.

Together AI: How much can I save with Provisioned Throughput?

Together AI offers up to 83% savings compared to commercial alternatives when using their Provisioned Throughput option with reserved capacity.

Source
Together AI: What is Together AI's fine-tuning pricing?

Standard fine-tuning costs $0.48 to $2.90 per 1M tokens depending on model size, with a minimum charge of $4.00 per job.

Source
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