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DeepSeek vs Grammarly

Features, pricing, ratings, and pros and cons, side by side.

Grammarly logo

Grammarly

AI writing assistant that corrects, rewrites and tone-checks your text across every app

Freemium
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Verdict

DeepSeek and Grammarly are both AI Assistants tools. DeepSeek scores higher in FinderAtlas's editorial review (8.8 vs 8.2 out of 10). Both have a free plan or trial. Only Grammarly is available on Chrome Extension and Firefox Extension.

Best overall

DeepSeek

  • Software developers
  • Researchers and analysts
  • Students
  • AI engineers

Choose DeepSeek if

  • You want a tool built for Low-cost API integration.
  • Web chat and mobile apps are free.
  • API output costs from $0.60 per 1M tokens (Flash, off-peak), well below most frontier providers.

Choose Grammarly if

  • You want a tool built for polishing emails and documents in real time across many apps, keeping tone and style consistent across a team.
  • Works across desktop, browser, Office, Google Docs and mobile keyboards, so suggestions follow you between apps.
  • Free plan covers core grammar, spelling and tone visibility with 100 AI prompts per month.
Best for beginners
DeepSeek
Best for business
Grammarly

Features

18 features compared.

  • V4 model family
    DeepSeek
    Available
    Grammarly
    Not available
  • Thinking mode
    DeepSeek
    Available
    Grammarly
    Not available
  • Open weights
    DeepSeek
    Available
    Grammarly
    Not available
  • OpenAI and Anthropic compatible API
    DeepSeek
    Available
    Grammarly
    Not available
  • Tool calls and JSON output
    DeepSeek
    Available
    Grammarly
    Not available
  • Search and Fetch APIs
    DeepSeek
    Available
    Grammarly
    Not available
  • Agent tool integrations
    DeepSeek
    Available
    Grammarly
    Not available
  • DeepSeek Harness
    DeepSeek
    Available
    Grammarly
    Not available
  • Vision on Flash
    DeepSeek
    Available
    Grammarly
    Not available
  • Citation Tools
    DeepSeek
    Not available
    Grammarly
    Available
  • Style Guides and Brand Tones
    DeepSeek
    Not available
    Grammarly
    Available
  • Cross-App Availability
    DeepSeek
    Not available
    Grammarly
    Available
  • Enterprise Security Controls
    DeepSeek
    Not available
    Grammarly
    Available
  • Grammar and Mistake Correction
    DeepSeek
    Not available
    Grammarly
    Available
  • Tone Detection and Adjustment
    DeepSeek
    Not available
    Grammarly
    Available
  • Full-Sentence and Paragraph Rewrites
    DeepSeek
    Not available
    Grammarly
    Available
  • AI Detector and Humanizer
    DeepSeek
    Not available
    Grammarly
    Available
  • Plagiarism Checker
    DeepSeek
    Not available
    Grammarly
    Available

Pricing

Plans as listed by each vendor. Check their sites for current prices.

  • Pricing model
    DeepSeek
    Freemium
    Grammarly
    Freemium
  • Free plan
    DeepSeek
    Yes
    Grammarly
    Yes
  • Starting price
    DeepSeek
    $0
    Grammarly
    $0
  • Plans
    DeepSeek
    3 plans
    Grammarly
    3 plans

DeepSeek plans

  • Chat and App

    Most popular

    $0

    Free access to DeepSeek models on web, iOS and Android

    • Web chat
    • iOS and Android apps
    • Thinking mode
    • Web search
    • File upload

  • API: deepseek-flash

    $0.15/1M input tokens

    Pay as you go; $0.15 cache-miss input and $0.60 output per 1M tokens off-peak, double at peak

    • 1M context
    • 384K max output
    • Vision
    • Tool calls
    • JSON output

  • API: deepseek-v4-pro

    $0.66/1M input tokens

    Pay as you go; $0.66 cache-miss input and $1.98 output per 1M tokens off-peak, double at peak

    • 1M context
    • 384K max output
    • Tool calls
    • JSON output

Grammarly plans

  • Free

    $0

    Basic writing help for individuals

    • Mistake correction
    • tone visibility
    • 100 AI prompts/month

  • Pro

    Most popular

    $30/month

    Individuals and eligible teams wanting advanced rewrites and detection

    • 2,000 AI prompts/member/month
    • tone adjustment
    • full-sentence rewrites
    • plagiarism detection
    • AI-generated text detection
    • style guide
    • brand tone
    • priority support

  • Enterprise

    Custom/custom

    Larger organizations with security and governance needs

    • Unlimited AI prompts
    • unlimited style guides and brand tones
    • SAML SSO
    • SCIM
    • audit logs API
    • data loss prevention
    • dedicated support

Our ratings

Scored out of 10 by the Finder Atlas editorial team. Last reviewed October 2026.

DeepSeek
8.8overall
Grammarly
8.2overall

DeepSeek leads in 0 categories and Grammarly in 1.

  • Reasoning & Logic

    DeepSeek
    8.8
    Grammarly
    Not rated

  • Coding & Syntax

    DeepSeek
    8.7
    Grammarly
    Not rated

  • Cost Efficiency

    DeepSeek
    9.6
    Grammarly
    Not rated

  • Long Context

    DeepSeek
    8.8
    Grammarly
    Not rated

  • Ease of Use

    Grammarly leads by 1.1
    DeepSeek
    8.0
    Grammarly
    9.1

  • Feature Depth

    DeepSeek
    Not rated
    Grammarly
    8.3

  • Value for Money

    DeepSeek
    Not rated
    Grammarly
    7.3

  • Performance & Speed

    DeepSeek
    Not rated
    Grammarly
    8.4

  • Documentation & Support

    DeepSeek
    Not rated
    Grammarly
    8.0

Scores weigh documented features, plan value, platform coverage, integrations and user feedback. A missing score means we have not rated that area yet.

Pros and cons

DeepSeek

Pros

  • Web chat and mobile apps are free
  • API output costs from $0.60 per 1M tokens (Flash, off-peak), well below most frontier providers
  • Open weights for V4 and earlier models on Hugging Face
  • 1M-token context and 384K max output on both API models
  • API works with both OpenAI and Anthropic SDKs and several coding agents

Cons

  • Peak-hour API rates are double the off-peak rates on weekday mornings UTC
  • deepseek-v4-pro does not support vision input
  • No image generation
  • Data is processed by a company based in China, which some organizations cannot accept

Grammarly

Pros

  • Works across desktop, browser, Office, Google Docs and mobile keyboards, so suggestions follow you between apps.
  • Free plan covers core grammar, spelling and tone visibility with 100 AI prompts per month.
  • Pro adds tone adjustment, full-sentence rewrites, plagiarism and AI-text detection in a single subscription.
  • Team features include style guides, brand tones, analytics and user groups; Enterprise adds SSO, SCIM and audit logs.
  • Public REST APIs exist for analytics, licence management, writing score and detection.

Cons

  • Monthly billing for Pro is $30, versus $12 per month on annual billing, so month-to-month use costs 2.5 times as much.
  • Third-party tests of the AI Detector report notable false-positive rates (figures range from 14.2% to 34% across sources), so it is unreliable as proof.
  • An App Store reviewer criticizes the iOS keyboard setup for pushing users to grant broad access.
  • Experienced writers on forums report turning off many suggestions; advanced features are gated behind Pro.

Platforms

  • Web
    DeepSeek
    Supported
    Grammarly
    Supported
  • Windows
    DeepSeek
    Supported
    Grammarly
    Supported
  • macOS
    DeepSeek
    Supported
    Grammarly
    Supported
  • iOS
    DeepSeek
    Supported
    Grammarly
    Supported
  • Android
    DeepSeek
    Supported
    Grammarly
    Supported
  • API
    DeepSeek
    Supported
    Grammarly
    Supported
  • Browser Extension
    DeepSeek
    Not supported
    Grammarly
    Not supported
  • Chrome Extension
    DeepSeek
    Not supported
    Grammarly
    Supported
  • Firefox Extension
    DeepSeek
    Not supported
    Grammarly
    Supported

Integrations

DeepSeek

6 integrations
  • OpenAI SDK
  • Anthropic SDK
  • Claude Code
  • Codex
  • OpenCode
  • Hugging Face

Grammarly

7 integrations
  • Microsoft Office
  • Google Docs
  • Chrome
  • Safari
  • Firefox
  • Edge
  • Zendesk

Company

  • Company
    DeepSeek
    DeepSeek
    Grammarly
    Superhuman
  • Founded
    DeepSeek
    2023
    Grammarly
    2009
  • Headquarters
    DeepSeek
    Hangzhou, China
    Grammarly
    San Francisco, CA
  • Monthly users
    DeepSeek
    Not listed
    Grammarly
    40 million people
  • Listing
    DeepSeek
    Claimed
    Grammarly
    Claimed

Frequently asked questions

Is DeepSeek better than Grammarly?

It depends on your workflow. DeepSeek is built for Low-cost API integration. Grammarly is built for polishing emails and documents in real time across many apps, keeping tone and style consistent across a team.

What are the key feature differences between DeepSeek and Grammarly?

DeepSeek: Free AI chat app and low-cost API running DeepSeek's open-weights V4 models. Grammarly: AI writing assistant that corrects, rewrites and tone-checks your text across every app.

Does DeepSeek or Grammarly have a free plan?

Yes, both do. DeepSeek is freemium and Grammarly is freemium, and each has a free plan or trial.

Which is cheaper, DeepSeek or Grammarly?

Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.