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Software · head to head

15Five vs Grammarly

15Five logo

15Five

Software

Performance management that drives results

From
$4/month
Rated
-
Full reviewWebsite
Grammarly logo

Grammarly

Software

Great writing, simplified

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Grammarly has a free tier, so it costs nothing to try first.
  • Each has a real cost: 15Five split across three tiers, so performance reviews, OKRs and 360 feedback need Perform at $11 per user per month rather than the $4 Engage tier; Grammarly occasional false positives and grammatically incorrect suggestions that can introduce errors
  • They diverge on capability: 15Five covers Weekly check-ins, Grammarly covers Grammar checking.

Where they differ

Only the attributes on which 15Five and Grammarly actually diverge.

Attributes where 15Five and Grammarly differ
Attribute15FiveGrammarly
Starting price$4/monthFree
Pricing modelsubscriptionUnknown
Free tierNoYes
PlatformsWeb, Ios, Android, ApiWeb, macOS, Windows, iOS, Android
Founded20112009

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 15Five

  • Weekly check-ins
  • 1-on-1 meetings
  • OKRs & goal tracking
  • Performance reviews
  • High fives recognition
  • Engagement surveys
  • Pulse surveys
  • Manager effectiveness

Only in Grammarly

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

Both cover

  • Slack
  • GDPR

What people use each for

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

15Five

  • Running engagement surveys with heat maps and benchmarkingnot Grammarly
  • Performance reviews and continuous feedback cyclesnot Grammarly
  • Setting and tracking OKRsnot Grammarly
  • 360 degree feedback and talent matrix reviewsnot Grammarly
  • Compensation review cycles as a paid add-onnot Grammarly

Grammarly

  • Email writingnot 15Five
  • Document editingnot 15Five
  • Academic writingnot 15Five
  • Business communicationnot 15Five
  • Content creationnot 15Five

Where each one falls short

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

15Five

  • Split across three tiers, so performance reviews, OKRs and 360 feedback need Perform at $11 per user per month rather than the $4 Engage tier
  • Manager training microlearnings are only in Total Platform at $16 per user per month
  • Compensation is a paid add-on at $9 per user per month, rising to $11 with benchmarking
  • The Kona meeting assistant is a further $2 per employee per month and Kona Coach $19 per manager per month
  • Advertised prices are the annual rates

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

Pricing, plan by plan

15Five

$4/month
  • Engage$4/month
    • Engagement surveys
    • Pulse surveys
    • Action planning
  • Perform$10/month
    • Weekly check-ins
    • 1-on-1s
    • Performance reviews
  • Total Platform$16/month
    • Everything in Engage & Perform
    • Career paths
    • Competencies

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

Which should you pick?

Choose 15Five if

  • You need weekly check-ins.
  • You work on Web, Ios, Android, Api.
  • You also want 1-on-1 meetings.
15Five review

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

Questions people ask

Is 15Five or Grammarly better?
Neither clearly leads. 15Five starts at $4/month and Grammarly at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, 15Five or Grammarly?
Grammarly has a free tier; the other does not. Paid plans start at $4/month for 15Five and Free for Grammarly.
Does 15Five or Grammarly run on more platforms?
15Five runs on Web, Ios, Android, Api. Grammarly runs on Web, macOS, Windows, iOS, Android.
Can I use Grammarly for free?
Yes. Grammarly has a free tier, so you can try it without paying. 15Five starts at $4/month.
What is 15Five best used for?
15Five is most often used for running engagement surveys with heat maps and benchmarking, performance reviews and continuous feedback cycles, setting and tracking okrs, 360 degree feedback and talent matrix reviews. Of those, running engagement surveys with heat maps and benchmarking and performance reviews and continuous feedback cycles are not what Grammarly is typically brought in for.
What can 15Five do that Grammarly cannot?
15Five covers Weekly check-ins, 1-on-1 meetings, OKRs & goal tracking, Performance reviews. Grammarly covers Grammar checking, Spelling correction, Punctuation, Clarity suggestions. Both handle Slack, GDPR.

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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