Skip to main content

Writesonic vs Grammarly

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

First tool

Try Writesonic (opens in a new tab)

Second tool

Try Grammarly (opens in a new tab)

Modalities — Writesonic Wins

Modalities: Writesonic compared with Grammarly
Feature	Writesonic	Grammarly
Text Input	Yes. Core feature	Yes, requires free plan. You write in the Grammarly editor or any connected surface; it rewrites and proofreads that text.
Image Upload / Vision	Partial. Limited support	No. A writing assistant, not a vision model.
Image Generation	Yes, requires pro plan	No. Does not generate images.
Voice Mode	No	No. No conversational voice loop is documented on the plans page.
Video Understanding	No	No. Not a video-analysis product.
Video Generation	No. Not a video generation product.	No. Not a video generation product.
File Upload (PDF, DOCX)	No	Unknown. Docs/PDF upload in the editor was not confirmed on the homepage/plans pages checked.
Code Execution	No	No. Does not run code.
Audio Input	No	No. No audio-file input is documented.
Canvas / Artifact Editor	Yes. Article editor	Partial. The editor is the product. It is not a Claude Artifacts side panel.
Screen Sharing / Computer Use	No	No. No computer-use product.

Memory & Context — Grammarly Wins

Memory & Context: Writesonic compared with Grammarly
Feature	Writesonic	Grammarly
Persistent Memory	No	Yes, requires plus plan. Style guide, brand tones, snippets, and Knowledge Share persist org/voice rules.
Large Context Window	Partial. Standard context	No. Not an LLM context-window product. Generative prompts are metered (100 free / 2,000 Pro).
Custom Instructions	No	Yes, requires plus plan. Style guide and brand tones steer suggestions. Enterprise can manage features centrally.
Conversation History	Yes	Partial. Documents and suggestion history live in the product. Not a multi-thread chat log like ChatGPT.

Integrations — Writesonic Wins

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

Developer — Writesonic Wins

Developer: Writesonic compared with Grammarly
Feature	Writesonic	Grammarly
Function Calling	No	No. Rewrite/proofread agents, not a developer tool-calling API.
Streaming Responses	Yes	Unknown. Token streaming is not documented as an API contract.
Fine-Tuning	No	No. Brand tones/style guides are settings, not custom-weight training.
Embeddings API	No	No. Not an embeddings API.
Structured Output (JSON)	No	No. Output is revised prose, not JSON schema.
Reasoning / Thinking Mode	No	No. Not an LLM Deep Think product. Humanizer/AI Detector are writing agents.
Local Execution		No. Cloud service. Enterprise BYOK is key management, not a local model.
Open Weights		No. Closed product, not an open-weight model release.
Multi-Agent Orchestration		Partial. Humanizer and AI Detector are named agents. Superhuman Go is the broader agent layer.

Platforms — Grammarly Wins

Platforms: Writesonic compared with Grammarly
Feature	Writesonic	Grammarly
Web App	Yes	Yes, requires free plan. grammarly.com is the web editor and account/plans surface.
iOS App	No	Unknown. A current iOS app was not confirmed on the homepage/plans pages checked.
Android App	No	Unknown. A current Android app was not confirmed on the homepage/plans pages checked.
Desktop App	No	Unknown. A native desktop app was not confirmed on the pages checked this round.
Chrome Extension	No	Yes, requires free plan. Grammarly’s in-page assistant is distributed as a browser extension, including Chrome.

Privacy — Tie

Privacy: Writesonic compared with Grammarly
Feature	Writesonic	Grammarly
GDPR Compliant	Yes	Unknown. SOC 2 Type 2 is documented. A GDPR DPA was not read.
Opt Out of Data Training	No	Yes, requires free plan. Homepage: does not sell/monetize user content or allow third-party providers to train on it.
Enterprise Privacy Mode	Yes, requires enterprise plan	Yes, requires enterprise plan. SSO/SAML, SCIM, confidential mode, DLP, BYOK, audit logs. SOC 2 Type 2.

Workspaces — Writesonic Wins

Workspaces: Writesonic compared with Grammarly
Feature	Writesonic	Grammarly
Projects / Folders	Yes. Workspaces	Partial. Style guide, brand tones, and snippets persist. Not a chat project workspace.