Email Clients

Spark vs Superhuman Mail

Compare Spark and Superhuman Mail side-by-side. See feature differences and pricing in the Email Clients category.

Most Features

by Readdle

No reviews yet

Pricing: Free tier with unlimited email accounts; Plus $10 and Pro $20 per user a month, or $99 and $199 per user a year; Enterprise is quote only. Checked September 2026.

Spark is an email client for Mac, Windows, iOS and Android from Readdle, with a priority sorting Smart Inbox and shared threads for teams.

15 /18 features Full profile

Superhuman Mail

by Superhuman

No reviews yet

Pricing: Starter $30 per member a month, or $25 billed annually; Business $40 or $33; Enterprise by quote. No no-cost tier and no trial. Checked September 2026.

Superhuman Mail is a keyboard-first email client for Gmail and Outlook teams, from Superhuman, formerly Grammarly. Paid plans only, no unified inbox.

11 /18 features Full profile

Feature Comparison

Email Clients features side-by-side

Feature	Spark 15/18 features	Superhuman Mail 11/18 features
Unified inbox across multiple accounts Mail from every connected account shows in one combined inbox.	Yes	No
IMAP, Exchange and Gmail support Accounts connect over IMAP, Microsoft Exchange and Google account protocols.	Yes	No
Snooze emails A message can be hidden and returned to the inbox at a chosen time.	Yes	Yes
Schedule emails to send later A message can be written now and sent automatically at a set time.	Yes	Yes
Reminders when no reply arrives The client nudges the sender if a message gets no reply by a chosen date.	Yes	Yes
Priority inbox that separates important mail Important messages are sorted from newsletters and notifications automatically.	Yes	Yes
Server and local mail rules Rules file, label or forward messages, on the server or in the client.	No	Yes
Offline access to mail Messages can be read, searched and drafted without a connection.	No	Yes
Built-in calendar and contacts Calendar and address book are part of the client rather than separate apps.	Yes	Yes
Reusable email templates Saved templates or snippets can be inserted into new messages.	Yes	Yes
PGP and S/MIME encryption Messages can be signed and encrypted end to end with PGP or S/MIME.	No	No
Blocks tracking pixels Remote images used for open tracking are blocked by default.	Yes	No
Delegate emails to teammates inside the client A message can be assigned to or shared with a colleague, with comments.	Yes	Yes
AI email drafting and summaries An assistant drafts replies and summarizes long threads inside the client.	Yes	Yes
Undo send A sent message can be recalled within a short window after sending.	Yes	Yes
Desktop apps for Windows, macOS and Linux Installable clients exist for the major desktop operating systems.	Yes	No
First-time sender screening Mail from unknown senders is held aside until the user accepts them.	Yes	No
Free email client tier A no-cost edition exists, usually limited in accounts or features.	Yes	No
Overall Rating	No reviews yet	No reviews yet

Spark 15/18 features

Unified inbox across multiple accounts: Yes
IMAP, Exchange and Gmail support: Yes
Snooze emails: Yes
Schedule emails to send later: Yes
Reminders when no reply arrives: Yes
Priority inbox that separates important mail: Yes
Server and local mail rules: No
Offline access to mail: No
Built-in calendar and contacts: Yes
Reusable email templates: Yes
PGP and S/MIME encryption: No
Blocks tracking pixels: Yes
Delegate emails to teammates inside the client: Yes
AI email drafting and summaries: Yes
Undo send: Yes
Desktop apps for Windows, macOS and Linux: Yes
First-time sender screening: Yes
Free email client tier: Yes

No reviews yet

Superhuman Mail 11/18 features

Unified inbox across multiple accounts: No
IMAP, Exchange and Gmail support: No
Snooze emails: Yes
Schedule emails to send later: Yes
Reminders when no reply arrives: Yes
Priority inbox that separates important mail: Yes
Server and local mail rules: Yes
Offline access to mail: Yes
Built-in calendar and contacts: Yes
Reusable email templates: Yes
PGP and S/MIME encryption: No
Blocks tracking pixels: No
Delegate emails to teammates inside the client: Yes
AI email drafting and summaries: Yes
Undo send: Yes
Desktop apps for Windows, macOS and Linux: No
First-time sender screening: No
Free email client tier: No

No reviews yet

Pricing

Spark

Free tier with unlimited email accounts; Plus $10 and Pro $20 per user a month, or $99 and $199 per user a year; Enterprise is quote only. Checked September 2026.

View plans

Superhuman Mail

Starter $30 per member a month, or $25 billed annually; Business $40 or $33; Enterprise by quote. No no-cost tier and no trial. Checked September 2026.

View plans

Explore Each Product

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