ChatGPT vs Slashy vs Superhuman

Verdict

Notis aside, ChatGPT has the highest support score, 80% across 32 checked rows out of 33. Slashy scores 55% across all 33 rows and Superhuman scores 42% across all 33 rows.

Their strengths differ: ChatGPT for rolling a shared assistant out to a team, Slashy for remembering context between conversations and Superhuman for scheduled and event-triggered work.

Notis and ChatGPT tie for the cheapest way in at $0, and only ChatGPT has a free plan that does the product's main job.

Only Notis documents Telegram and Email, and only ChatGPT documents Joins and records your meetings.

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Capabilities and pricing

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Capability comparison between Notis and the selected assistants
Capability	View pricing	ChatGPTVisit site	SlashyVisit site	SuperhumanVisit site
Where you can use it
WhatsApp		Partial	—Not offered; iMessage and Slack only	—No WhatsApp channel
iMessage		—	Text the agent via iMessage	—No iMessage channel
Telegram		—	—Not offered; iMessage and Slack only	—No Telegram channel
Slack			Tag the agent inside Slack	Message Go in Slack
Email		—	—	—No inbound assistant address
SMS or a phone number	PartialInbound calls only, no SMS	Partial	—	—No SMS/phone channel
Voice messages	Voice notes + live calls		Voice dictation for drafts	—Dictation only, not a channel
Web or desktop app	Web, desktop and Home Screen app		Web app + Mac desktop app (macOS 12+)	Desktop app + browser ext.
Its own iPhone or Android app	Home Screen app on iPhone			iOS + Android (Mail)
Bring your own AI
Runs on your own Claude plan		Not checked	—	—No BYO Claude subscription
Runs on your own ChatGPT plan				—No BYO ChatGPT subscription
Bring your own API key	—			—BYOK = encryption, not API key
Works inside your own coding agent				Publishes Mail + Docs MCP servers
You choose which model runs your work				—No user-facing model picker
What it can do
Ready-made app integrations	1,000+ apps	Partial	Partial	Partial94 named connectors
Creates and edits documents				Writes into persistent Docs
Save your own reusable instructions			Partial	Custom agent builder
Browses the web for you			—	—Extension is a suggestion overlay
Posts to social media for you			—No social publishing documented	—No publish/schedule action
Joins and records your meetings	—		—	—No first-party recorder/bot
Memory
Remembers you between conversations				Knowledge Base persists across chats
Reads your existing files and apps	Notion, Gmail, Drive, Granola, web			94-connector directory
Runs without you
Runs on a schedule or a trigger				Schedule, event or trigger
Reminds and nudges you				Remind Me + Auto Reminders
Computers it can use
Gives it a cloud computer of its own		Partial	—	—No persistent cloud machine
Controls your own computer	Shell and apps, via the desktop app		—	—Overlay only, no shell/app control
Connects to MCP servers on your computer			—	—
Trust & control
Open source	—	Partial	—	—Fully closed-source SaaS
Run it on your own server	—	Partial	—Vendor-hosted on AWS (US) only	—Vendor-hosted only
Says it will not train on your data	Covers Notis and its LLM providers	Partial	Not used to train own or provider models	Content not used to train models
Published security certification	PartialSub-processors certified; Notis is not		SOC 2 Type II; CASA Tier 2	SOC 2 Type 2, ISO 27001, HIPAA
Plans & support
Free plan does the product's main job	Partial		—7-day trial, card required; no free plan	PartialFree tier exists, excludes Mail
Shared team workspace				Per-seat plans with shared admin/SSO
Price	FREEPRO$13/moyr (rate on a yearly commitment)+2 more	Codex CLI (free software; API/model usage billed separately)Free+7 more	Professional$25/user/moyr (rate on a yearly commitment)EnterpriseCustom pricing	FreeStarter$25/user/moyr (rate on a yearly commitment)+2 more

IncludedPartial— Not documentedNot checked

Ranked by support score

1. Notis

Personal AI assistant

Notis is a personal AI assistant you message from WhatsApp, iMessage, Telegram, Slack or email, and reach from your own coding agent through its MCP server.

Best for: reaching it from the apps you already message in

Documented strengths

Where you can use it: WhatsApp, iMessage, Telegram, Slack, Email, Voice messages, Web or desktop app and Its own iPhone or Android app
What it can do: Ready-made app integrations, Creates and edits documents, Save your own reusable instructions, Browses the web for you and Posts to social media for you
Bring your own AI: Runs on your own Claude plan, Runs on your own ChatGPT plan, Works inside your own coding agent and You choose which model runs your work

The catch

The gap is published guarantees about your data, with nothing documented for Open source and Run it on your own server.

Pricing

FREEPRO$13/moyrPRO+$39/moyrULTRA$99/moyr

Free–$149/mo · help.notis.ai

See Notis pricingSupport score: 83% across all 33 rows

2. ChatGPT

General-purpose AI assistant

Combines conversational help, multi-step Work, and Codex across web, mobile, and desktop.

Best for: rolling a shared assistant out to a team

Documented strengths

What it can do: Creates and edits documents, Save your own reusable instructions, Browses the web for you, Posts to social media for you and Joins and records your meetings
Bring your own AI: Runs on your own ChatGPT plan, Bring your own API key, Works inside your own coding agent and You choose which model runs your work
Where you can use it: Slack, Voice messages, Web or desktop app and Its own iPhone or Android app

The catch

The gap is messaging channels, with nothing documented for iMessage, Telegram and Email.

Pricing

Codex CLI (free software; API/model usage billed separately)FreeGo$8/moBusiness Standard$20/user/moyrPlus$20/moBusiness Premium$100/user/moyrPro 5x$100/moPro 20x$200/moEnterpriseCustom pricing

$0-$200/month individual; Business $25-$125/user/month ($20-$100 annual); Enterprise custom · free tier available · chatgpt.com

How it differs from Notis: A broad destination assistant with first-party models and agentic Chat, Work, and Codex surfaces, rather than a channel-first cross-provider execution layer.

Visit ChatGPT ChatGPT alternativesSupport score: 80% across 32 checked rows out of 33

3. Slashy

AI email client

Slashy is an AI-native Gmail client whose agent drafts replies in your voice, schedules meetings, runs automations, and takes instructions from iMessage and Slack.

Best for: remembering context between conversations

Documented strengths

Where you can use it: iMessage, Slack, Voice messages, Web or desktop app and Its own iPhone or Android app
Bring your own AI: Runs on your own ChatGPT plan, Bring your own API key, Works inside your own coding agent and You choose which model runs your work
Memory: Remembers you between conversations and Reads your existing files and apps

The catch

The gap is connected tools, with nothing documented for Browses the web for you, Posts to social media for you and Joins and records your meetings.

Pricing

Professional$25/user/moyrEnterpriseCustom pricing

$25–$30/user/mo (Professional $30 monthly, $25 billed annually); Enterprise custom · no free tier · slashy.ai

How it differs from Notis: Slashy is the inbox itself: a Gmail client with an agent inside it, where iMessage and Slack are ways to reach your mailbox rather than general-purpose assistant channels, and it reaches beyond email and calendar only through a short list of CRM, Notion and notetaker integrations.

Visit Slashy Slashy alternativesSupport score: 55% across all 33 rows

4. Superhuman

AI email client and productivity suite

Grammarly's AI productivity suite: an AI email client (Mail), collaborative Docs, and an assistant (Go) that follows you across your apps.

Best for: scheduled and event-triggered work

Documented strengths

Where you can use it: Slack, Web or desktop app and Its own iPhone or Android app
Memory: Remembers you between conversations and Reads your existing files and apps
Runs without you: Runs on a schedule or a trigger and Reminds and nudges you

The catch

The gap is support for your own AI plan, with nothing documented for Runs on your own Claude plan, Runs on your own ChatGPT plan, Bring your own API key and You choose which model runs your work.

Pricing

FreeStarter$25/user/moyrBusiness$33/user/moyrEnterpriseCustom pricing

$25–$33 per member/month billed annually (Starter $25, Business $33); $30–$40 per member/month billed monthly; Enterprise custom · no free tier · superhuman.com

How it differs from Notis: Superhuman centers on one email inbox (Mail) plus a writing/Docs suite (Go, Grammarly, Docs), reachable via desktop app, browser extension, mobile app and Slack messages to Go. Notis is reachable on WhatsApp, iMessage, Telegram, Slack, email and voice as well, and executes across model providers rather than one fixed proprietary AI.

Visit Superhuman Superhuman alternativesSupport score: 42% across all 33 rows

Questions about this comparison

Which of ChatGPT, Slashy or Superhuman scores highest in the evidence checked so far?

ChatGPT, with 80% across 32 checked rows out of 33. Slashy scores 55% across all 33 rows and Superhuman scores 42% across all 33 rows.

How much do they cost?

ChatGPT: $0-$200/month individual; Business $25-$125/user/month ($20-$100 annual); Enterprise custom; Slashy: $25–$30/user/mo (Professional $30 monthly, $25 billed annually); Enterprise custom; Superhuman: $25–$33 per member/month billed annually (Starter $25, Business $33); $30–$40 per member/month billed monthly; Enterprise custom. Notis and ChatGPT all start at $0, and only ChatGPT has a free plan that does the product's main job.

Which of them can I try for free?

ChatGPT has a free tier and Slashy and Superhuman do not.

Which of them work in Voice messages?

ChatGPT and Slashy do. Superhuman does not.

Where does Notis fit in?

Notis is number 1 on this page. Against ChatGPT: A broad destination assistant with first-party models and agentic Chat, Work, and Codex surfaces, rather than a channel-first cross-provider execution layer.

How we checked

We checked each product's official pages against the same 33 capability rows. The support score is the share of checked rows a product documents. Partial support counts half, and rows not checked yet stay out of the score. Notis chose the rows and is scored the same way. The score does not measure reliability, reply speed or writing quality. Last checked 21 August 2026.

Sources

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