AI Tools · head to head
Arize AI vs Grammarly

Arize AI
AI Tools
AI engineering platform for observability and evaluation of agents and LLM apps
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Arize AI the free plan caps trace spans at 25,000 per month with only 15 days of retention.; Grammarly occasional false positives and grammatically incorrect suggestions that can introduce errors
- They diverge on capability: Arize AI covers End-to-end tracing, Grammarly covers Grammar checking.
Where they differ
Only the attributes on which Arize AI and Grammarly actually diverge.
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 Arize AI
- End-to-end tracing
- Evaluation framework
- Prompt testing and improvement
- Alyx AI engineering agent
- Custom dashboards
- Data warehouse integrations
Only in Grammarly
- Grammar checking
- Spelling correction
- Punctuation
- Clarity suggestions
- Engagement feedback
- Delivery insights
- Plagiarism checker
- Citation generator
What people use each for
The jobs each tool is most often brought in to do.
Arize AI
- Tracing and debugging production AI agentsnot Grammarly
- Running large-scale evaluations across traces and sessionsnot Grammarly
- Improving prompts before production rolloutnot Grammarly
- Storing and querying GenAI traces alongside a data warehousenot Grammarly
Grammarly
- Email writingnot Arize AI
- Document editingnot Arize AI
- Academic writingnot Arize AI
- Business communicationnot Arize AI
- Content creationnot Arize AI
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Arize AI
- The free plan caps trace spans at 25,000 per month with only 15 days of retention.
- Self-hosted deployment and Data Fabric integration are restricted to the custom-priced Enterprise tier.
- Pricing beyond the $50/month Pro plan requires a custom quote, making cost planning less transparent at scale.
- Advanced compliance features like HIPAA are only available on Enterprise.
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
Arize AI
Free- AX FreeFree
- 25k trace spans/month
- 1 GB storage/month
- 15-day retention
- AX Pro$50/month
- 50k trace spans/month
- 10 GB storage/month
- 30-day retention
- AX Enterprise$undefined/mo
- Custom trace spans, storage, and retention
- SaaS or self-hosted deployment
- Managed agents and Data Fabric
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 Arize AI if
- You need end-to-end tracing.
- You want to start without paying.
- You work on web, api.
- You also want evaluation framework.
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.
Questions people ask
- Is Arize AI or Grammarly better?
- Neither clearly leads. Arize AI starts at Free and Grammarly at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Arize AI or Grammarly?
- Arize AI starts at Free and Grammarly at Free.
- Does Arize AI or Grammarly run on more platforms?
- Arize AI runs on web, api. Grammarly runs on Web, macOS, Windows, iOS, Android.
- Can I use Arize AI for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Arize AI best used for?
- Arize AI is most often used for tracing and debugging production ai agents, running large-scale evaluations across traces and sessions, improving prompts before production rollout, storing and querying genai traces alongside a data warehouse. Of those, tracing and debugging production ai agents and running large-scale evaluations across traces and sessions are not what Grammarly is typically brought in for.
- What can Arize AI do that Grammarly cannot?
- Arize AI covers End-to-end tracing, Evaluation framework, Prompt testing and improvement, Alyx AI engineering agent. Grammarly covers Grammar checking, Spelling correction, Punctuation, Clarity suggestions.
Answered from the vendors’ own pages
Arize AI: What does Arize AX cost?
Arize AX offers a free plan, a Pro plan at $50/month, and a custom-priced Enterprise plan, with pricing based on trace spans, storage, and retention needs.
SourceGrammarly: 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.
SourceArize AI: Is there a free plan, and what are its limits?
The AX Free plan includes 25,000 trace spans and 1 GB of storage per month with 15-day retention, plus unlimited users, evaluations, and experiments.
SourceGrammarly: 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.
SourceArize AI: What deployment options are available?
Free and Pro plans are SaaS-only, while Enterprise customers can choose SaaS or self-hosted deployment with custom SLAs.
SourceGrammarly: 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.
SourceGrammarly: 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.
SourceRelated pages
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- Grammarly vs LastPass
- Grammarly vs QuickBooks
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- Grammarly vs Airtable
- Grammarly vs Todoist
- Grammarly vs Calendly
- Grammarly vs BambooHR
- Grammarly vs Freshdesk
- Grammarly vs Pipedrive
- Grammarly vs Workday
- Grammarly vs Visual Studio Code
- Grammarly vs Zoom
- Grammarly vs Microsoft Teams
- Grammarly vs Basecamp
- Grammarly vs Trello
- Grammarly vs Loom
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