Copy.ai vs Grammarly
A feature-by-feature comparison of Copy.ai and Grammarly across 7 capability categories.
Modalities — Copy.ai Wins
| Feature | Copy.ai | Grammarly |
|---|---|---|
Text Input | Yes. Auto populated | Yes, requires free plan. You write in the Grammarly editor or any connected surface; it rewrites and proofreads that text. |
Image Upload / Vision | No. Auto populated | No. A writing assistant, not a vision model. |
Image Generation | No. Auto populated | No. Does not generate images. |
Voice Mode | No. Auto populated | No. No conversational voice loop is documented on the plans page. |
Video Understanding | No. Auto populated | No. Not a video-analysis product. |
Video Generation | No. Not a video generation product. | No. Not a video generation product. |
File Upload (PDF, DOCX) | Yes. Auto populated | Unknown. Docs/PDF upload in the editor was not confirmed on the homepage/plans pages checked. |
Code Execution | Partial. Auto populated | No. Does not run code. |
Audio Input | No. Auto populated | No. No audio-file input is documented. |
Canvas / Artifact Editor | Yes. Auto populated | Partial. The editor is the product. It is not a Claude Artifacts side panel. |
Screen Sharing / Computer Use | No. Auto populated | No. No computer-use product. |
Memory & Context — Copy.ai Wins
| Feature | Copy.ai | Grammarly |
|---|---|---|
Persistent Memory | Yes. Auto populated | Yes, requires plus plan. Style guide, brand tones, snippets, and Knowledge Share persist org/voice rules. |
Large Context Window | Yes. Auto populated | No. Not an LLM context-window product. Generative prompts are metered (100 free / 2,000 Pro). |
Custom Instructions | Yes. Auto populated | Yes, requires plus plan. Style guide and brand tones steer suggestions. Enterprise can manage features centrally. |
Conversation History | Yes. Auto populated | Partial. Documents and suggestion history live in the product. Not a multi-thread chat log like ChatGPT. |
Integrations — Copy.ai Wins
| Feature | Copy.ai | Grammarly |
|---|---|---|
Web Search / Browsing | Yes. Auto populated | No. Does not browse the live web to answer questions. |
Plugins / Extensions | No. Auto populated | Yes, requires free plan. Works inside other apps (homepage shows Zendesk). That is an editor overlay, plus a browser extension. |
API Access | Paid Only. Auto populated | Partial. Enterprise lists an Audit Logs API. That is not a public generate-text REST API. |
Zapier Integration | Yes. Auto populated | Unknown. No first-party Zapier app was checked. |
Custom GPTs / Bots | Yes. Auto populated | No. No Custom GPT store. Superhuman Go agents are a separate Superhuman surface. |
Real-time Collaboration | Partial. Auto populated | 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 — Copy.ai Wins
| Feature | Copy.ai | Grammarly |
|---|---|---|
Function Calling | No. Auto populated | No. Rewrite/proofread agents, not a developer tool-calling API. |
Streaming Responses | Yes. Auto populated | Unknown. Token streaming is not documented as an API contract. |
Fine-Tuning | No. Auto populated | No. Brand tones/style guides are settings, not custom-weight training. |
Embeddings API | No. Auto populated | No. Not an embeddings API. |
Structured Output (JSON) | No. Auto populated | No. Output is revised prose, not JSON schema. |
Reasoning / Thinking Mode | No. Auto populated | 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
| Feature | Copy.ai | Grammarly |
|---|---|---|
Web App | Yes. Auto populated | Yes, requires free plan. grammarly.com is the web editor and account/plans surface. |
iOS App | No. Auto populated | Unknown. A current iOS app was not confirmed on the homepage/plans pages checked. |
Android App | No. Auto populated | Unknown. A current Android app was not confirmed on the homepage/plans pages checked. |
Desktop App | No. Auto populated | Unknown. A native desktop app was not confirmed on the pages checked this round. |
Chrome Extension | No. Auto populated | Yes, requires free plan. Grammarly’s in-page assistant is distributed as a browser extension, including Chrome. |
Privacy — Copy.ai Wins
| Feature | Copy.ai | Grammarly |
|---|---|---|
GDPR Compliant | Yes. Auto populated | Unknown. SOC 2 Type 2 is documented. A GDPR DPA was not read. |
Opt Out of Data Training | Yes. Auto populated | Yes, requires free plan. Homepage: does not sell/monetize user content or allow third-party providers to train on it. |
Enterprise Privacy Mode | Yes. Auto populated | Yes, requires enterprise plan. SSO/SAML, SCIM, confidential mode, DLP, BYOK, audit logs. SOC 2 Type 2. |
Workspaces — Copy.ai Wins
| Feature | Copy.ai | Grammarly |
|---|---|---|
Projects / Folders | Yes. Auto populated | Partial. Style guide, brand tones, and snippets persist. Not a chat project workspace. |