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QuillBot vs Superhuman

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

First tool

Try QuillBot (opens in a new tab)

Second tool

Try Superhuman (opens in a new tab)

Modalities — Tie

Modalities: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
Text Input	Yes, requires free plan. Paraphraser and grammar tools take typed text. Directory lists Freemium. Homepage was Cloudflare-blocked this round.	Yes, requires pro plan. Email compose, docs, and Grammarly Go accept text. Paid product.
Image Upload / Vision	No. Writing assistant, not vision.	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. Not a voice assistant.	Unknown. Voice features were not confirmed.
Video Understanding	No. Not a video product.	No. Not a video product.
Video Generation	Unknown. Cloudflare blocked the public site; video generation was not confirmed.	No. Not a video generation product.
File Upload (PDF, DOCX)	Unknown. A document uploader was not confirmed (Cloudflare).	Partial. Email attachments and docs. Not a general PDF chat uploader.
Code Execution	No. Not a code sandbox.	No. Not a code sandbox.
Audio Input	No. Not a speech product.	Unknown. Dictation was not confirmed.
Canvas / Artifact Editor	No. Text editor, not a canvas.	Partial. Superhuman Docs editor for collaborative writing.
Screen Sharing / Computer Use	No. No computer-use.	No. No computer-use product.

Memory & Context — Superhuman Wins

Memory & Context: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
Persistent Memory	No. Not a chat-memory product.	Partial. Sounds Like You and writing style learn over time.
Large Context Window	Unknown. Word limits were not fetched this round.	Unknown. Depends on underlying models. Not published on homepage.
Custom Instructions	Unknown. Modes (standard/fluency) exist in market; not re-verified this round.	Partial. Sounds Like You adapts tone. Not a full system-prompt editor.
Conversation History	Unknown. Not confirmed this round.	Yes, requires pro plan. Email threads and docs history persist in the product.

Integrations — Superhuman Wins

Integrations: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
Web Search / Browsing	No. Not a search engine.	Unknown. Web search in AI features was not confirmed.
Plugins / Extensions	Unknown. Integrations were not confirmed this round.	Yes, requires pro plan. 800+ tool integrations in the Superhuman suite.
API Access	Unknown. Not confirmed this round.	No. Consumer productivity app, not a public API.
Zapier Integration	Unknown. Not checked.	Unknown. Zapier integration was not checked.
Custom GPTs / Bots	No. No custom-GPT store.	No. Not a GPT store. Distinct from Grammarly matrix tool.
Real-time Collaboration	No. Not a multiplayer 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	Unknown. A citation generator is part of the product in market; it was not verified this round.	No. Not a cited-search product.

Developer — Tie

Developer: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
Function Calling	No. Not a developer tools API.	Unknown. Tool use in AI features was not confirmed.
Streaming Responses	Unknown. Not confirmed.	Partial. AI writing suggestions stream inline.
Fine-Tuning	No. You do not train QuillBot.	No. Does not fine-tune models.
Embeddings API	No. Not an embeddings API.	No. Not an embeddings product.
Structured Output (JSON)	No. Returns rewritten text, not JSON schema.	No. Outputs mail and docs, not JSON schemas.
Reasoning / Thinking Mode	No. Paraphraser, not Deep Think.	Unknown. Reasoning models in AI features were not confirmed.
Local Execution	No. Cloud web app.	No. Cloud-synced mail and docs.
Open Weights	No. Closed product.	No. Proprietary product stack.
Multi-Agent Orchestration	No. Not an orchestrator.	No. Not a multi-agent platform.

Platforms — Tie

Platforms: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
Web App	Yes, requires free plan. quillbot.com (reached a Cloudflare challenge, but the host is a web app).	Yes, requires pro plan. Superhuman mail and docs in the browser. Paid seats.
iOS App	Unknown. Not confirmed this round.	Partial. Mobile apps are advertised for mail.
Android App	Unknown. Not confirmed this round.	Partial. Mobile apps are advertised for mail.
Desktop App	Unknown. Not confirmed this round.	Partial. Native mail clients for Mac and Windows.
Chrome Extension	Unknown. Not confirmed this round (Cloudflare).	Unknown. Extension strategy was not checked; Grammarly has one separately.

Privacy — Tie

Privacy: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
GDPR Compliant	Unknown. Not checked.	Unknown. Compliance docs were not re-read.
Opt Out of Data Training	Unknown. Not checked.	Unknown. Training policy was not checked.
Enterprise Privacy Mode	Unknown. Not checked.	Partial. Enterprise mail plans exist. DPA not read this round.

Workspaces — Tie

Workspaces: QuillBot compared with Superhuman
Feature	QuillBot	Superhuman
Projects / Folders	Unknown. Not confirmed.	Partial. Labels and splits organize mail; docs have folders.