Best 6 Email Tone Checkers in 2026: Compare Your Options

Introduction

Choosing an email tone checker depends on where you write and what kind of feedback you need. This roundup covers six tools for checking, adjusting, or scoring email tone, from everyday drafts to sales messages and brand reviews.

Quick comparison

Grammarly and Copilot provide feedback as you write. Professionally focuses on rewriting, while ChatSpark, Typetone, and SignalFlow analyze or score content you submit. Pricing is not confirmed here, so check with each provider for current plan details. Microsoft Copilot in Outlook is listed without a link because no official product URL was confirmed.

1. Grammarly

Best for: Checking tone while writing across websites and apps.

Grammarly detects the tone of your writing and suggests ways to adjust it, including in email drafts. It’s available on the web, through browser extensions and desktop apps, and on iOS. Its main advantage is that tone detection works across different writing surfaces, so you don’t have to paste a message into a separate analyzer.

2. Microsoft Copilot in Outlook

Best for: People who draft email in Outlook.

Copilot in Outlook reviews draft emails and suggests changes to tone, clarity, and reader sentiment. It’s available on the web, desktop, iOS, and Android. The reader-focused feedback can be useful when a draft feels blunt or unclear. Since it’s part of Outlook, you can review a message without moving it to a separate analyzer.

3. Professionally AI Email Writer

Best for: Rewriting an email to fit a chosen tone.

Professionally AI Email Writer rewrites emails in styles such as formal, friendly, empathetic, and confident. You can use the web app or Outlook add-in. Instead of only flagging how a draft sounds, it lets you select a tone before requesting a rewrite. That can help when you know a message needs a different feel but don’t want to revise every sentence yourself.

4. ChatSpark Message Tone Analyzer

Best for: Analyzing the tone of a pasted message.

ChatSpark Message Tone Analyzer checks messages for qualities such as friendliness, formality, urgency, and passive-aggressiveness. It works with emails, support replies, follow-ups, and internal updates. Its range of tone qualities can help you spot more than formality. For example, the analysis may flag a message that comes across as overly urgent or passive-aggressive.

5. Typetone Content Assurance

Best for: Teams checking email against brand guidance.

Typetone Content Assurance scores content, including emails, for brand alignment and tone of voice. Its product page also describes content compliance reviews. This makes it relevant to teams that need to check whether a message fits brand guidance and meets compliance requirements. It’s geared more toward organized content review than quick feedback on a single everyday draft.

6. SignalFlow Email Grader

Best for: Evaluating cold sales emails before sending.

SignalFlow Email Grader scores cold emails on criteria including tone, clarity, and calls to action. It’s designed for sales email drafts, rather than every kind of business message. The multi-criteria grade lets sales senders review several parts of an outreach email at once, rather than relying on tone feedback alone.

How we picked these tools

Each tool has a stated use for checking, rewriting, or scoring the tone of an email or message. The list includes options that give feedback within a writing workflow, such as Grammarly and Copilot in Outlook, as well as standalone tools for analyzing or grading a draft.

We considered different needs, including individual writers, Outlook users, teams checking brand guidance, and people preparing sales outreach. We’ve kept stated product features separate from assumptions and haven’t ranked tools using unsupported claims about accuracy or price. The tools also vary in the kind of feedback they provide: a tone suggestion, a rewrite, and a multi-criteria score serve different purposes.

Frequently asked questions

What does an email tone checker evaluate?

An email tone checker may assess qualities such as formality, friendliness, urgency, or how a message might feel to its reader. The feedback varies by tool.

Do these tools edit emails automatically?

Some suggest changes, some rewrite a message in a selected tone, and others analyze or grade a draft. Check any suggested edit before using it to make sure it preserves your meaning and fits the context.

Which kind of email tone checker should I choose?

Choose based on your workflow and the type of email you’re writing. You might need feedback on an Outlook draft, a brand review, or a grade for cold outreach.

The verdict

These tools suit different writing needs. Grammarly checks tone across websites and apps, including while you write email. Copilot in Outlook gives feedback on drafts within Outlook, while Professionally AI Email Writer lets you choose a tone and request a rewrite. For more specific tasks, Typetone reviews brand alignment, ChatSpark analyzes messages, and SignalFlow grades cold sales emails.