Letterly
Turn your speech into well-written text
Synthesys AI Voice Generator
Text-to-speech AI voiceovers in more than 140 languages
Updated June 2026
| Letterly | Synthesys AI Voice Generator | |
|---|---|---|
| Rating | 4.8★ | 5.0★ |
| Reviews | 8 | 1 |
| Pros | 9 | 0 |
| FactScore™ | 45.3 | 15.1 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Letterly — Pros
Speech to text Time saving User friendly Fast performance Custom prompts Developer communication Device synchronization Simple design Voice recognitionBoth tools — Pros
—Only in Synthesys AI Voice Generator — Pros
No unique pros listedOnly in Letterly — Cons
Advanced formatting Buggy Desktop app Team collaborationBoth tools — Cons
—Only in Synthesys AI Voice Generator — Cons
—Details
| Letterly | Synthesys AI Voice Generator | |
|---|---|---|
| Categories | Writing assistants, Text-to-Speech Software | Text-to-Speech Software |
| Platforms | Web · iOS · Android | Web |
| Added | January 27, 2024 | December 22, 2024 |
| Website | letterly.app | synthesys.cello.so |
Who Should Pick Which?
Choose Letterly if...
- Speech to text
- Time saving
- User friendly
Choose Synthesys AI Voice Generator if...
- No unique pros listed
With a FactScore™ of 45.3 vs 15.1, Letterly leads in community reception. Letterly uniquely offers Speech to text and Time saving, while Synthesys AI Voice Generator stands out for No unique pros listed.
What Users Say
Letterly
Letterly now became my number 1 app for long messages. It’s quick and it makes easy-to-read messages
Letterly is probably my favourite app of all time. It makes my life so much easier because I can just say what I want to say and no matter how many umms and ahhs I mumble while talking, it will rem...
This app has transformed my daily work life for the better! Whenever I have an idea, I simply open Letterly, speak for a bit, and the app rearranges everything to make it clearer. Thanks to the lat...
Synthesys AI Voice Generator
Great visuals need great sound. Synthesys AI Voice Generator powers professional voiceovers, while Phedra X provides an easy way to edit and refine visuals, ensuring creators have everything they n...
Related Comparisons
Frequently Asked Questions
Which is better, Letterly or Synthesys AI Voice Generator?
Based on FactScore™, Letterly leads with a score of 45.3 vs 15.1. Letterly has a higher rating of 4.8★ compared to 5.0★.
What are the pros of Letterly compared to Synthesys AI Voice Generator?
Letterly uniquely offers: Speech to text, Time saving, User friendly, Fast performance, Custom prompts.
What are the pros of Synthesys AI Voice Generator compared to Letterly?
Synthesys AI Voice Generator uniquely offers: No unique pros listed.
Is Letterly better rated than Synthesys AI Voice Generator?
Letterly is rated 4.8★ from 8 reviews. Synthesys AI Voice Generator is rated 5.0★ from 1 reviews.
What is the FactScore™ of Letterly and Synthesys AI Voice Generator?
FactScore™ weighs rating and review volume together. Letterly scores 45.3 and Synthesys AI Voice Generator scores 15.1.
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