SaneBox vs Superhuman Mail vs Spark Mail

Compared on	SaneBox Free trial · from $5.42/mo VisitRemove	Superhuman Mail From $25/member/mo VisitRemove	Spark Mail Free plan · from $8.25/user/mo VisitRemove
What it is	Email filtering service that sorts less important mail into separate folders	AI email app for teams that use Gmail or Outlook	Cross-platform email app with a smart inbox, AI writing and team features
Free plan	No	No	Unlimited email accounts and core email features; AI assistant limited to 1 month of email history; 5 AI meeting notes (lifetime); 2 free active collaborators; 10 assignments per team; 5 GB team file storage.
Cheapest paid plan	$5.42/mo billed annually (Snack)SaneBox pricing	$25/member/mo billed annually (Starter)Superhuman Mail pricing	$8.25/user/mo billed annually (Plus)Spark Mail pricing
What it covers	1 email account and 2 SaneBox features; $4.54 per month when paid every two years. Educational, non-profit and government agencies can get 25% off.	Mail is also included in the Superhuman suite Business plan ($40 monthly, or $33 per member/month billed annually), which bundles Mail, Grammarly, Docs and Go.	$99 per year when billed annually.
Free trial	7-day free trial with all features for up to 4 email accounts	None stated	7-day free trial of Plus or Pro when subscribing in the app
Platforms	iOS, Android	macOS, Chrome extension	macOS, Windows, iOS, Android
Integrations (vendor's figure)	Not stated	Not stated	Not stated
Open source	No	No	No
Good for	Cutting inbox clutter without switching email apps Keeping newsletters out of the main inbox Cleaning up a long-neglected inbox	Working through a heavy Gmail or Outlook inbox faster Drafting routine replies with AI Sales teams viewing CRM records next to email	Managing several email accounts in one app across computer and phone Drafting and summarising emails with AI Sharing and assigning emails within a small team
Watch out for	No free plan; only a 7-day trial Snack covers 1 email account with 2 features; all features require Dinner Relies on folders, which POP email accounts do not support	No free plan for Mail; the Superhuman suite's Free and Pro plans do not include Mail Built for Gmail and Outlook users; other email providers are not mentioned on the product page Auto Drafts, Ask AI and CRM integrations require the Business plan	Free plan AI assistant only covers 1 month of email history and includes 5 lifetime meeting notes Free plan allows 2 active collaborators and 10 assignments per team Workflows, Auto-Labels and Auto-Drafts are listed as coming soon on Pro
Made by	SaneBox, Inc.	Superhuman (formerly Grammarly)	Readdle (Spark Mail Limited)

Entry prices are the cheapest paid plan, as each vendor publishes it; “What it covers” says what that price is per (a user, a channel, a brand, a number of contacts). The sources are listed on each tool's page.

Every tool in AI email and inbox tools is on its category page, with the written head-to-heads on Compare.