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Grammarly vs Superhuman

A feature-by-feature comparison of Grammarly and Superhuman across 7 capability categories.

First tool

Try Grammarly (opens in a new tab)

Second tool

Try Superhuman (opens in a new tab)

Modalities — Tie

Modalities: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
Text Input	Yes, requires free plan. You write in the Grammarly editor or any connected surface; it rewrites and proofreads that text.	Yes, requires pro plan. Email compose, docs, and Grammarly Go accept text. Paid product.
Image Upload / Vision	No. A writing assistant, not a vision model.	Unknown. Whether AI reads images in mail was not checked.
Image Generation	No. Does not generate images.	No. Mail and docs product, not image gen.
Voice Mode	No. No conversational voice loop is documented on the plans page.	Unknown. Voice features were not confirmed.
Video Understanding	No. Not a video-analysis product.	No. Not a video product.
Video Generation	No. Not a video generation product.	No. Not a video generation product.
File Upload (PDF, DOCX)	Unknown. Docs/PDF upload in the editor was not confirmed on the homepage/plans pages checked.	Partial. Email attachments and docs. Not a general PDF chat uploader.
Code Execution	No. Does not run code.	No. Not a code sandbox.
Audio Input	No. No audio-file input is documented.	Unknown. Dictation was not confirmed.
Canvas / Artifact Editor	Partial. The editor is the product. It is not a Claude Artifacts side panel.	Partial. Superhuman Docs editor for collaborative writing.
Screen Sharing / Computer Use	No. No computer-use product.	No. No computer-use product.

Memory & Context — Grammarly Wins

Memory & Context: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
Persistent Memory	Yes, requires plus plan. Style guide, brand tones, snippets, and Knowledge Share persist org/voice rules.	Partial. Sounds Like You and writing style learn over time.
Large Context Window	No. Not an LLM context-window product. Generative prompts are metered (100 free / 2,000 Pro).	Unknown. Depends on underlying models. Not published on homepage.
Custom Instructions	Yes, requires plus plan. Style guide and brand tones steer suggestions. Enterprise can manage features centrally.	Partial. Sounds Like You adapts tone. Not a full system-prompt editor.
Conversation History	Partial. Documents and suggestion history live in the product. Not a multi-thread chat log like ChatGPT.	Yes, requires pro plan. Email threads and docs history persist in the product.

Integrations — Superhuman Wins

Integrations: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
Web Search / Browsing	No. Does not browse the live web to answer questions.	Unknown. Web search in AI features was not confirmed.
Plugins / Extensions	Yes, requires free plan. Works inside other apps (homepage shows Zendesk). That is an editor overlay, plus a browser extension.	Yes, requires pro plan. 800+ tool integrations in the Superhuman suite.
API Access	Partial. Enterprise lists an Audit Logs API. That is not a public generate-text REST API.	No. Consumer productivity app, not a public API.
Zapier Integration	Unknown. No first-party Zapier app was checked.	Unknown. Zapier integration was not checked.
Custom GPTs / Bots	No. No Custom GPT store. Superhuman Go agents are a separate Superhuman surface.	No. Not a GPT store. Distinct from Grammarly matrix tool.
Real-time Collaboration	Partial. Team style guides and analytics. Not a multiplayer cursor in one doc.	Yes, requires pro plan. Real-time collaborative docs.
Live Social Data Integration	No. No live social firehose.	No. No social firehose.
Live Citation Mapping	Partial. Plans mention keeping citations consistent. That is style, not live academic search.	No. Not a cited-search product.

Developer — Tie

Developer: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
Function Calling	No. Rewrite/proofread agents, not a developer tool-calling API.	Unknown. Tool use in AI features was not confirmed.
Streaming Responses	Unknown. Token streaming is not documented as an API contract.	Partial. AI writing suggestions stream inline.
Fine-Tuning	No. Brand tones/style guides are settings, not custom-weight training.	No. Does not fine-tune models.
Embeddings API	No. Not an embeddings API.	No. Not an embeddings product.
Structured Output (JSON)	No. Output is revised prose, not JSON schema.	No. Outputs mail and docs, not JSON schemas.
Reasoning / Thinking Mode	No. Not an LLM Deep Think product. Humanizer/AI Detector are writing agents.	Unknown. Reasoning models in AI features were not confirmed.
Local Execution	No. Cloud service. Enterprise BYOK is key management, not a local model.	No. Cloud-synced mail and docs.
Open Weights	No. Closed product, not an open-weight model release.	No. Proprietary product stack.
Multi-Agent Orchestration	Partial. Humanizer and AI Detector are named agents. Superhuman Go is the broader agent layer.	No. Not a multi-agent platform.

Platforms — Grammarly Wins

Platforms: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
Web App	Yes, requires free plan. grammarly.com is the web editor and account/plans surface.	Yes, requires pro plan. Superhuman mail and docs in the browser. Paid seats.
iOS App	Unknown. A current iOS app was not confirmed on the homepage/plans pages checked.	Partial. Mobile apps are advertised for mail.
Android App	Unknown. A current Android app was not confirmed on the homepage/plans pages checked.	Partial. Mobile apps are advertised for mail.
Desktop App	Unknown. A native desktop app was not confirmed on the pages checked this round.	Partial. Native mail clients for Mac and Windows.
Chrome Extension	Yes, requires free plan. Grammarly’s in-page assistant is distributed as a browser extension, including Chrome.	Unknown. Extension strategy was not checked; Grammarly has one separately.

Privacy — Grammarly Wins

Privacy: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
GDPR Compliant	Unknown. SOC 2 Type 2 is documented. A GDPR DPA was not read.	Unknown. Compliance docs were not re-read.
Opt Out of Data Training	Yes, requires free plan. Homepage: does not sell/monetize user content or allow third-party providers to train on it.	Unknown. Training policy was not checked.
Enterprise Privacy Mode	Yes, requires enterprise plan. SSO/SAML, SCIM, confidential mode, DLP, BYOK, audit logs. SOC 2 Type 2.	Partial. Enterprise mail plans exist. DPA not read this round.

Workspaces — Tie

Workspaces: Grammarly compared with Superhuman
Feature	Grammarly	Superhuman
Projects / Folders	Partial. Style guide, brand tones, and snippets persist. Not a chat project workspace.	Partial. Labels and splits organize mail; docs have folders.