Alternatives · 2026
Best Superinbox Alternatives in 2026
24 alternatives · 22 with a free plan · Updated
What are the best Superinbox alternatives?
The best Superinbox alternatives for AI Email Assistant in 2026 are Ellie AI (ellie is an AI email reply generator, free), Warmest.ai (AI email writer, free) and Write Mail AI (free AI email writer, free). 22 of the 24 listed alternatives have a free or freemium plan.
Looking for something other than Superinbox? Below are 24 alternatives in AI Email Assistant, AI Email Generator and AI Email Writer, all closely matched, ranked by how much they overlap with Superinbox. Superinbox itself is enterprise (custom pricing). Each entry shows what the tool does, what it shares with Superinbox, its key features and pricing.
What is Superinbox?
Superinbox is sold on an enterprise pricing model, so expect to talk to the company rather than sign up for a self-serve plan. The product is an AI email assistant that drafts replies in your own writing style and sorts your inbox into categories based on rules you set.
- Pricing
- Enterprise
Key features of Superinbox
- It also sorts emails into categories based on your rules
Superinbox alternatives compared
| Tool | Pricing | Shared with Superinbox | Match |
|---|---|---|---|
| Superinbox | Enterprise | — | Original |
| Ellie AI | Free | AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply | Strong match |
| Warmest.ai | Free | AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply | Strong match |
| Write Mail AI | Free | AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply | Strong match |
| Ghostwrite: AI Email Writing Assistant | Free | AI Email Assistant, AI Email Generator, AI Email Writer | Strong match |
| Mailr | Free | AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply | Strong match |
Top 24 alternatives to Superinbox
- #1
Ellie is an AI email reply generator that learns your writing style and drafts replies in Gmail, Outlook web, and Fastmail.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
- It also supports multiple languages and roles for different email contexts
Pricing: free
- #2W
Warmest.ai is an AI email writer that drafts personalized replies, summarizes threads, and adjusts tone while connecting to your calendar.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
- Saves time writing emails
- Personalized email drafts
- Integrates with calendar
Pricing: free
- #3
Write Mail AI is a free AI email writer that drafts, replies to, and analyzes emails, with grammar correction and summarization, on desktop or mobile.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
Pricing: free
- #4
Ghostwrite is an AI email generator that drafts messages from your input, adapts to your writing style over time, and helps you save time on email.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- Saves time on email writing
- Helps users communicate clearly and confidently
- Improves email quality
Pricing: free
- #5
Mailr is an AI email writer that drafts new messages and replies in a range of custom tones, with a free tier for short emails.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
- Saves time on email writing
- Easy to use with a simple interface
- Offers a variety of custom tones
Pricing: free
- #6
Emailor is an AI email generator that drafts professional emails from a few inputs like purpose, tone, and key points, saving writing time.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- It aims to save time and improve email communication
Pricing: free
- #7
Mailyr is an AI email writer and generator that drafts messages inside Gmail through a Chrome extension, with a free starter plan.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- AI-powered Chrome extension for writing emails in Gmail using AI
Pricing: free plan, paid plans from $4.90
- #8
Chrome extension that writes Gmail emails and replies from short voice prompts, so you can speak what you want instead of typing it.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
- It appears when you compose or reply in Gmail
- By clicking on VoiceType
Pricing: free
- #9
superReply is an AI email reply generator for Gmail and Outlook that drafts tone-matched responses with one click.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
- Saves time and increases productivity
- Provides personalized and tone-matched responses
- Easy to use with one-click response generation
Pricing: free
- #10
TimeNavi AI Email Writer is an email writing assistant for Gmail and Outlook that drafts replies and new messages using GPT.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- AI email writer for Gmail and Outlook
Pricing: free
- #11
AI Mailer is a free AI email writer that uses GPT to draft professional emails so you can save time on routine messages.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- Saves time and money by automating email writing
- Improves the quality of email communications
- Ensures consistent and professional tone
Pricing: free
- #12
Friday is an AI email writer that drafts messages, checks grammar, and adapts to your personal writing style.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- Saves time by automating email writing
- Improves writing quality with grammar checks and suggestions
- Reduces stress associated with email communication
Pricing: free
- #13
AI email writing assistant for Gmail that drafts new messages and replies in several languages, saving time on everyday email composition.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
- Saves time on email writing and replies
- Improves email productivity
- Offers personalized and professional email composition
Pricing: free
- #14
Opnbx helps sales reps write personalized cold emails faster, drawing on LinkedIn data to support better open and reply rates.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- Saves time on writing personalized sales emails
- Improves email open and reply rates
- Helps reps personalize emails without extensive time investment
Pricing: free
- #15
AI email writer that drafts personalized marketing emails for Amazon WorkMail, with CSV uploads for bulk sending and formal or fun tone options.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- Simple and easy-to-use interface
- Integration with Amazon WorkMail
- Option to convert text to different formal or fun levels
Pricing: free
- #16
CXassist is an AI email assistant that automates inbox management and writes replies to incoming emails.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
Pricing: free
- #17
ReplylessAI is an AI email management tool that sorts messages into split inboxes, drafts replies, and helps qualify sales leads from your inbox.
In common with Superinbox: AI Email Assistant, AI Email Writer, AI Reply
- AI email inbox that automates sorting
Pricing: free
- #18
OwlU is an AI email assistant that sorts important messages, drafts replies, and summarizes threads across multiple email accounts.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Reply
- It also allows users to integrate multiple email accounts and provides autom
Pricing: free
- #19R
R.Ai is an AI email writer that drafts replies in your own style, trained on your past emails with customers, investors, and your team.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- It understands your organization and knows how you interact with customers
- It has full context of each conversation and quickly generates responses in your style
- It knows how you like to interact with your customers
Pricing: free
- #20
Spark Mail is an email app for desktop, Android, and iOS with AI email writing, summaries, and inbox sorting.
In common with Superinbox: AI Email Assistant, AI Email Writer
- Spark +AI (Compose +AI
- Home Screen for Desktop
- Priority Email
Pricing: paid, from $7.99
- #21
AI email writer that works as a Chrome extension, drafting and replying to Gmail messages in any language in under 10 seconds.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer
- AI email assistant that helps write and reply to emails faster
Pricing: free
- #222
AI email reply generator that drafts replies to forwarded emails, with an optional one-line directive that shapes the draft.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Email Writer, AI Reply
Pricing: free
- #23R
ReplyInbox is an AI email assistant for Gmail that drafts personalized replies, saving time on routine inbox responses.
In common with Superinbox: AI Email Assistant, AI Email Generator, AI Reply
- Saves time and effort in responding to emails
- Personalized replies improve customer satisfaction
- Easy to use with a simple workflow
Pricing: free
- #24
AI email assistant for Apple Mail, Gmail, and Outlook with writing help, email tracking, templates, and send-later scheduling.
In common with Superinbox: AI Email Assistant, AI Email Generator
- AI-powered email assistant for Apple Mail
Pricing: paid, from $3.95
How we picked these Superinbox alternatives
We rank tools by how closely they match Superinbox: tools that share more of its categories rank first, then tools whose main category, tags and description overlap with it, then community votes and views. Pricing type and features come from each product's SoftwareVital listing. Admins can pin or remove tools from this list.
Frequently asked questions
What are the best alternatives to Superinbox in 2026?
The closest alternatives to Superinbox are Ellie AI, Warmest.ai, Write Mail AI, Ghostwrite: AI Email Writing Assistant and Mailr. They are ranked by how many categories and tags they share with Superinbox and how similar their descriptions are, then by community votes and views on SoftwareVital.
What is the closest alternative to Superinbox?
Ellie AI is the closest match because it shares AI Email Assistant, AI Email Generator and AI Email Writer with Superinbox. It is free.
Are there free alternatives to Superinbox?
Yes. 22 of the 24 alternatives have a free or freemium plan, including Ellie AI (free), Warmest.ai (free), Write Mail AI (free), Ghostwrite: AI Email Writing Assistant (free) and Mailr (free). Superinbox is enterprise (custom pricing).
Which Superinbox alternatives are paid or enterprise tools?
Spark Mail (paid) and Mailbutler (paid) use paid or enterprise pricing, which usually means more support and admin options for teams.
How does Superinbox compare to Ellie AI?
Ellie AI overlaps with Superinbox in AI Email Assistant, AI Email Generator and AI Email Writer. Its listed features include it also supports multiple languages and roles for different email contexts. Pricing: free. Open the side-by-side compare page for a full breakdown.
What category is Superinbox in?
Superinbox is listed under AI Email Assistant on SoftwareVital. Browse that category to see more tools in the same group.