How do their growth rates compare?

DeepL has a month-over-month growth rate of -1.7%; WhatLetter has +9.9%.

How does pricing compare?

DeepL: Freemium. Offers a Free tier (50,000 characters/month and 1 file up to 5 MB); paid DeepL Pro plans billed annually are Individual at $8.74/month (€7.49/month), Team at $28.74/user/month (€24.99/user/month), and Business at $57.49/user/month (€49.99/user/month, which bundles DeepL Write Pro), plus custom Enterprise and metered API plans. All paid Translator plans include 30 minutes/user/month of DeepL Voice. WhatLetter: Freemium. WhatLetter uses a freemium model. The Free tier covers capturing documents, up to 3 documents translated per month and up to 3 chat sessions per month. WhatLetter Plus is $1.99 USD per month, with a yearly option advertised at 16% off, and unlocks unlimited document translations, unlimited chat and access to all supported languages. Voice typing and Telegram integration are listed as upcoming rather than included today.

What are alternatives to DeepL and WhatLetter?

Other tools in related categories include ChatGPT, Claude, DeepSeek, Grammarly, QuillBot Paraphraser.

DeepL vs WhatLetter — Traffic (95.11M vs 310), Pricing & Verdict

Open AI Tools

DeepL vs WhatLetter — Traffic (95.11M vs 310), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	DeepL	WhatLetter
Official Domain	deepl.com	whatletter.com
Pricing Model	Freemium	Freemium
Monthly Visits	95.11M (95,110,871)	310 (310)
MoM Traffic Delta	-1.66M (-1.7%)	+28 (+9.9%)
Primary Market & Share	🇩🇪 Germany (15.8%)	🇨🇴 Colombia (83.7%)
Direct Visits / mo	60.38M	129
User Rating	4.7	4
Supported Platforms	Website	Website

DeepL

Enterprise-grade neural machine translation, AI writing refinement, and real-time voice translation across thirty-plus global languages.

Layout-Preserving Document Translation

Translates whole PDF, Word (.docx), PowerPoint (.pptx), Excel (.xlsx), and HTML files up to 30 MB (Individual/Team) or 100 MB (Business/Enterprise) while keeping original fonts, tables, slides, and visual formatting intact.

Customization Hub: Glossaries, Style Rules & Translation Memory

Ensures consistent brand and technical terminology across language pairs using CSV-importable shared glossaries, automated glossary generation, shared style rule lists, and translation memory.

DeepL Write Pro AI Writing Assistant

Enhances original drafts and translated copy with real-time sentence rewrites, word alternatives, and one-click tone adjustments (e.g., Business, Academic, Casual, Diplomatic) via browser, desktop, and Microsoft 365/Google Workspace add-ins.

DeepL Voice for Meetings & Conversations

Provides real-time spoken language translation and live multilingual captions for video conferences and mobile in-person dialogues, with 30 minutes per user per month included in paid DeepL Pro plans.

Strengths & Pros

+Consistently outperforms generic machine translators in idiomatic fluency, register control (formal vs. informal), and specialized European and Asian language pairs.
+