Letty records 198 monthly visits with -85.4% month-over-month growth and Freemium pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.
AI email writing and smart replies, right inside Gmail
AI sidebar and browser agent for reading, writing and research
| Dimension / Metric | ||
|---|---|---|
| Official Domain | useletty.com | sider.ai |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 198 (198) | 2.64M (2,644,740) |
| MoM Traffic Delta | -1.16K (-85.4%) | -314.2K (-10.6%) |
| Primary Market & Share | 🇮🇳 India (100%) | 🇺🇸 United States (13.3%) |
| Direct Visits / mo | 77 | 1.7M |
| User Rating | 3.8 | 4.5 |
| Supported Platforms | Website | Website |
AI email writing and smart replies, right inside Gmail
Letty reads the incoming thread and proposes replies that fit the conversation, helping you clear your inbox without writing every response from scratch.
Turn a rough idea into a finished message. Letty drafts professional emails for pitches, follow-ups, introductions, and everyday correspondence.
Attach documents, FAQs, or a website URL and Letty draws on that material to answer questions accurately in your replies.
Letty can mirror your tone and phrasing so outgoing mail sounds like you rather than a generic template.
AI sidebar and browser agent for reading, writing and research
A persistent panel that reads the page you are on and answers follow-ups with GPT, Claude or Gemini without copying content into another tab.
Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.
Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.
Smart, focused email with AI help — for individuals and teams
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.
Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.
Turn a few key points into polished, on-tone emails
Turn a few key points into polished, on-tone emails
An AI email assistant that drafts, summarizes, and perfects your messages in place
An AI email assistant that drafts, summarizes, and perfects your messages in place
One AI sidebar for ChatGPT, Claude and Gemini across the web
One AI sidebar for ChatGPT, Claude and Gemini across the web
