Harmony AI Email Voice Assistant
Emails
Reach Inbox Zero hands-free with voice-controlled email.
Like Letty, Harmony AI Email Voice Assistant is in the Emails category. Both are freemium. Worth comparing on the detail page.
We've curated 50 of the best alternatives to Letty, ranked by feature overlap, topic similarity, user ratings, and popularity. Harmony AI Email Voice Assistant, Canary Mail, and Re:GPT lead the list as the closest matches.
Updated May 18, 2026
The list includes 1 free alternative, 46 freemium, 2 paid, and 1 with a free trial, so whether you're looking for a no-cost replacement or a more capable paid tier, there's an option to compare. Letty itself is freemium, which makes freemium alternatives the most natural starting point.
Many of these tools cluster around use cases like Free + From $9/mo, Ai Assistant, Email Management, and Productivity Tool — the same problem spaces Letty addresses. Cross-referencing tools that overlap on multiple topics gives a more reliable signal than category alone, because two products in the same category can still serve very different workflows.
Our ranking weighs eight signals: shared category, topic overlap, feature overlap, name and description text similarity (via PostgreSQL's pg_trgm and tsvector), Bayesian-smoothed user ratings, pricing-model match, popularity, and editorial overrides. Scores are then normalized within each tool's own candidate pool so the top match always represents the strongest available alternative.
Use the table of contents below to jump to free or paid alternatives, or scroll down to compare each option side-by-side with Letty.
Ranked by compatibility score
Emails
Reach Inbox Zero hands-free with voice-controlled email.
Like Letty, Harmony AI Email Voice Assistant is in the Emails category. Both are freemium. Worth comparing on the detail page.
Emails
Automated productivity, content, and inbox management.
1 free and 46 freemium options.
2 paid options.
2 paid alternatives to Letty on /tools/letty/alternatives.
26 additional candidates
Harmony AI Email Voice Assistant ranks as the highest-scoring alternative to Letty, based on shared category, topic overlap, feature similarity, and user ratings. Ratings are still being collected for this tool.
Yes — 1 fully free and 46 freemium alternatives are available, including Harmony AI Email Voice Assistant, Canary Mail, and Re:GPT.
Harmony AI Email Voice Assistant is similarly priced (freemium) and sits in the same category (Emails). View its detail page to compare features, integrations, and reviews side-by-side.
Top Emails alternatives include Harmony AI Email Voice Assistant, Canary Mail, Re:GPT, and Arch AI. These tools share the same primary category and have meaningful topic overlap with Letty.
Like Letty, Canary Mail is in the Emails category. Both are freemium. Worth comparing on the detail page.
Emails
Enhanced email productivity with faster composition.
Like Letty, Re:GPT is in the Emails category. Both are freemium. Worth comparing on the detail page.
Emails
The first AI email copilot to boost productivity.
Like Letty, Arch AI is in the Emails category. Arch AI is free, while Letty is freemium. Worth comparing on the detail page.
Emails
Supercharge Gmail with smart replies and task automation.
Like Letty, EmailWhiz is in the Emails category. EmailWhiz is paid, while Letty is freemium. Worth comparing on the detail page.
Emails
AI-powered email for blazing speed and productivity
Like Letty, Superhuman is in the Emails category. Superhuman is paid, while Letty is freemium. Worth comparing on the detail page.
Emails
Craft engaging emails instantly with AI
Like Letty, Free AI Email Generator is in the Emails category. Free AI Email Generator is free-trial, while Letty is freemium. Worth comparing on the detail page.
Email Management
Reach inbox zero in minutes.
Inbox Zero shares 2 topics with Letty: Email Management and Ai Assistant. Both are freemium.
Email Management
AI assistant that organizes your inbox and saves time.
Emilio shares 2 topics with Letty: Email Management and Ai Assistant. Both are freemium.
Team Collaboration
Unify business communication and collaboration in one space.
Spike shares 2 topics with Letty: Email Management and Ai Assistant. Both are freemium.
Email Management
Email that works for you
Notion Mail shares 2 topics with Letty: Email Management and Ai Assistant. Both are freemium.
Coloring Pages
Create any coloring page you can imagine, in seconds.
ColorBliss shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Language Learning
Practice speaking, reading, writing and listening and improve your learning.
Languate shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Voice Notes Summaries
Voice notes transcribed and summarized automatically.
Audionotes shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Websites
Website creation with automated content and design.
Zarla shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Chatbot Platform
Create an AI-Powered chatbot for your website
Copilot.Live shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Apps
Build predictive models on the modern data stack.
Continual shares 1 topic with Letty: Ai Assistant. Both are freemium.
Email Writing
Write emails that get answers
Twain shares 1 topic with Letty: Email Management. Both are freemium.
Chatgpt
Advice service via WhatsApp.
God In A Box shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Google Business Profiles
Automated SEO optimizes Google profiles.
ProfilePro shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Content
Streamlined content creation for improved productivity.
FuseBase AI shares 1 topic with Letty: Free + From $9/mo. Both are freemium.
Meetings
Revolutionize meetings: Connect, summarize, boost productivity.
Mavis shares 1 topic with Letty: Ai Assistant. Both are freemium.
Calls
AI assistant for call tasks, saving you hold time.
PineAi shares 1 topic with Letty: Ai Assistant. Both are freemium.
Browser Automation
AI assistant for smarter browsing and web automation.
Starizon AI shares 1 topic with Letty: Ai Assistant. Both are freemium.
41 more free/freemium alternatives listed below. Browse all Letty alternatives ↓
47 free or freemium alternatives to Letty on /tools/letty/alternatives.
WordUp App shares 1 topic with Letty: Ai Assistant. Both are freemium.
Neither Letty nor Harmony AI Email Voice Assistant has user ratings yet — be the first to review either tool to help future visitors compare them.
