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Software · head to head

Grammarly vs OmniFocus 3

Grammarly logo

Grammarly

Software

Great writing, simplified

From
Free
Rated
-
Full reviewWebsite
OmniFocus 3 logo

OmniFocus 3

Software

Professional task management for complex workflows

From
$39.99/year
Rated
-
Full reviewWebsite

The short version

  • Only Grammarly has a free tier, so it costs nothing to try first.
  • Each has a real cost: Grammarly occasional false positives and grammatically incorrect suggestions that can introduce errors; OmniFocus 3 apple platforms only apart from the web client: macOS 14, iOS or iPadOS 17, watchOS 10 or visionOS 2 and newer are required, with no Windows or Android app
  • They diverge on capability: Grammarly covers Grammar checking, OmniFocus 3 covers GTD-based task organization.

Where they differ

Only the attributes on which Grammarly and OmniFocus 3 actually diverge.

Attributes where Grammarly and OmniFocus 3 differ
AttributeGrammarlyOmniFocus 3
Starting priceFree$39.99/year
Pricing modelUnknownsubscription
Free tierYesNo
PlatformsWeb, macOS, Windows, iOS, AndroidMacOS, IOS, IPadOS, Web
Founded20091993

Identical on both: user rating (Not yet rated), category (Unknown).

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 Grammarly

  • Grammar checking
  • Spelling correction
  • Punctuation
  • Clarity suggestions
  • Engagement feedback
  • Delivery insights
  • Plagiarism checker
  • Citation generator

Only in OmniFocus 3

  • GTD-based task organization
  • Projects and subprojects
  • Contexts and tags
  • Custom perspectives
  • Automation
  • Quick entry
  • Sync across devices
  • Deferred and due dates

What people use each for

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

Grammarly

  • Email writingnot OmniFocus 3
  • Document editingnot OmniFocus 3
  • Academic writingnot OmniFocus 3
  • Business communicationnot OmniFocus 3
  • Content creationnot OmniFocus 3

OmniFocus 3

  • Getting Things Done style task and project management on Apple devicesnot Grammarly
  • Capturing tasks with contexts, defer dates and review cyclesnot Grammarly
  • Syncing a personal task database across Mac, iPhone, iPad and Watchnot Grammarly

Where each one falls short

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

Grammarly

  • Occasional false positives and grammatically incorrect suggestions that can introduce errors
  • Privacy concerns about sending text to Grammarly's servers for analysis
  • AI capabilities sometimes produce hallucinations and fabricated citations that appear grammatically correct

OmniFocus 3

  • Apple platforms only apart from the web client: macOS 14, iOS or iPadOS 17, watchOS 10 or visionOS 2 and newer are required, with no Windows or Android app
  • Web access is not included with a perpetual licence and costs an extra $4.99 per month or $49.99 per year
  • The Pro perpetual licence costs $149.99 against $74.99 for Standard
  • Future major upgrades are a paid discount rather than free for perpetual licence holders
  • The $99.99 per year subscription is the only option that bundles Pro plus web access

Pricing, plan by plan

Grammarly

Free
  • FreeFree
    • Basic grammar and spelling checks
    • Tone visibility
    • 100 AI prompts per month
  • Pro$12/month
    • Sentence rewrites
    • Tone adjustment
    • Plagiarism and AI detection

OmniFocus 3

$39.99/year
  • Standard$39.99/year
    • Mac and iOS apps
    • Cloud sync
    • Core features
  • Pro$99.99/year
    • Everything in Standard
    • Advanced automation
    • Perspective management

Which should you pick?

Choose Grammarly if

  • You need grammar checking.
  • You want to start without paying.
  • You work on Web, macOS, Windows, iOS, Android.
  • You also want spelling correction.
Grammarly review

Choose OmniFocus 3 if

  • You need gtd-based task organization.
  • You work on MacOS, IOS, IPadOS, Web.
  • You also want projects and subprojects.
OmniFocus 3 review

Questions people ask

Is Grammarly or OmniFocus 3 better?
Neither clearly leads. Grammarly starts at Free and OmniFocus 3 at $39.99/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grammarly or OmniFocus 3?
Grammarly has a free tier; the other does not. Paid plans start at Free for Grammarly and $39.99/year for OmniFocus 3.
Does Grammarly or OmniFocus 3 run on more platforms?
Grammarly runs on Web, macOS, Windows, iOS, Android. OmniFocus 3 runs on MacOS, IOS, IPadOS, Web.
Can I use Grammarly for free?
Yes. Grammarly has a free tier, so you can try it without paying. OmniFocus 3 starts at $39.99/year.
What is Grammarly best used for?
Grammarly is most often used for email writing, document editing, academic writing, business communication. Of those, email writing and document editing are not what OmniFocus 3 is typically brought in for.
What can Grammarly do that OmniFocus 3 cannot?
Grammarly covers Grammar checking, Spelling correction, Punctuation, Clarity suggestions. OmniFocus 3 covers GTD-based task organization, Projects and subprojects, Contexts and tags, Custom perspectives.

Answered from the vendors’ own pages

Grammarly: Does Grammarly have a free version?

Yes, Grammarly offers a free tier with basic spelling, grammar, and punctuation checks, tone visibility, and 100 AI prompts per month. The Pro plan ($12/month annual) adds sentence rewriting, plagiarism detection, and 2,000 AI prompts.

Source
Grammarly: What platforms does Grammarly work with?

Grammarly works across 1 million+ apps including Google Docs, Microsoft Word, Outlook, Slack, Gmail, and web browsers. It also integrates with productivity tools like Asana, Jira, Monday.com, Confluence, and HubSpot.

Source
Grammarly: Can I use Grammarly offline?

Grammarly requires an internet connection to function, though the browser extension works with some offline text areas. For offline use, the desktop app and browser extensions sync when reconnected.

Source
Grammarly: What is included in the Enterprise plan?

The Enterprise plan includes unlimited team members, dedicated support, custom roles and permissions, data loss prevention, bring-your-own-key encryption, and unlimited AI prompts. Pricing is custom and available by contacting sales.

Source
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