How do their growth rates compare?

Fast Translator has a month-over-month growth rate of —; Sider has -10.6%.

How does pricing compare?

Fast Translator: Freemium. Freemium / bring-your-own-key. The extension itself is free to add from the Chrome Web Store, while the translation and AI features depend on OpenAI and Google Translate API access, which you supply and pay for separately according to those providers' own pricing. Sider: Freemium. Freemium. Free tier available with limited credits; paid plans advertised at roughly US$10/month for occasional use up to around US$100/month at the top tier, with higher credit allowances and a dedicated cloud computer on the upper plans.

What are alternatives to Fast Translator and Sider?

Other tools in related categories include ChatGPT, Claude, DeepL, Monica, Immersive Translate.

Head-to-Head Benchmark

Fast Translator vs Sider

Fast Translator records 0 monthly visits with — month-over-month growth and Freemium pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.

Fast TranslatorFreemium

Translate, polish, and summarize any text in your browser with OpenAI and Google Translate

Monthly Visits

0

MoM Velocity

—

Top Market

🌐 Global

View Fast Translator Analysis

chromewebstore.google.com

SiderFreemiumTraffic Leader

AI sidebar and browser agent for reading, writing and research

Monthly Visits

2.64M

MoM Velocity

-10.6%

Top Market

🇺🇸 United States

View Sider Analysis sider.ai

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Fast Translator	Sider
Official Domain	chromewebstore.google.com	sider.ai
Pricing Model	Freemium	Freemium
Monthly Visits	0 (0)	2.64M (2,644,740)

Primary Market & Share	🌐 Global (—)	🇺🇸 United States (13.3%)

Direct Visits / mo	0	1.7M

User Rating	3.7	4.5

Supported Platforms	Browser Extension	Website

Fast Translator

Translate, polish, and summarize any text in your browser with OpenAI and Google Translate

Dual translation engines

Translate text using either the Google Translate API for speed or the OpenAI API for more natural, context-aware phrasing.

In-page translation

Work directly on the page you are reading instead of copying text into a separate translation site.

Polish and rewrite

Improve the wording and fluency of a sentence or paragraph through an OpenAI-powered polishing function.

Analyze and summarize

Break down the meaning of a passage or condense a long block of text into a short summary.

Strengths & Pros

+Adds translation and AI text help right inside Chrome with no separate app to open
+Supports both Google Translate and OpenAI, letting you pick the engine that fits the task
+Includes useful extras beyond translation, such as polish, analyze, and summarize
+Small install size and simple extension-based setup

Limitations

Frequently Asked Questions: Fast Translator vs Sider

Fast Translator has 0 monthly visits, while Sider has 2,644,740. Traffic estimates describe audience size, not product quality.

More Head-to-Head Matchups

ChatGPT vs Fast Translator

6.05B visits/mo

ChatGPT vs Sider

6.05B visits/mo

Claude vs Fast Translator

1.25B visits/mo

Claude vs Sider

1.26B visits/mo

DeepL vs Fast Translator

95.11M visits/mo

DeepL vs Sider

97.76M visits/mo

Best Alternatives to Fast Translator & Sider (12)

–Requires your own OpenAI and/or Google Translate API keys, so there is no true turnkey free tier
–Quality depends entirely on the third-party models you connect
–The listing has a small user base and no ratings, so long-term maintenance is uncertain
–Handles personally identifiable information, so sensitive text should be used with care

Sider

AI sidebar and browser agent for reading, writing and research

AI sidebar on any page

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 and chat with documents

Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.

Translation and read-aloud

Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.

Sider Hand browser agent

Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.

Strengths & Pros

+Works inside the browser you already use, with no context switching
+Access to multiple frontier models from one subscription
+Strong reading toolkit: PDF chat, YouTube summaries, translation and read-aloud
+Increasingly capable agent features for multi-step browser tasks

Limitations

–Useful credits run out quickly on the free and lower tiers

–Model availability and quota rules change over time, so expectations must be checked per plan

–Some agent and code features depend on a cloud machine and heavier plans

01

ChatGPT

6B/mo

SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.

AI ChatbotFreemium+2.2%

02

Claude

1.3B/mo

SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.

AI AssistantFreemium+23.8%

#2

03

DeepL

95.1M/mo

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

AI TranslateFreemium63% direct

#3

04

Monica

4.5M/mo

Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.

AI AssistantFreemium55% direct

Monica web app showing an AI chat conversation with model selector and sidebar tools

05

Immersive Translate

2.4M/mo

Bilingual AI translation for websites, documents, video and images

AI TranslateFreemium, Free Trial75% direct

Immersive Translate showing a bilingual web page with original and translated text side by side

06

OpenL Translate

1.5M/mo

AI translation for text, images, documents and speech in 100+ languages

AI TranslateFreemium, Subscription+8.8%

OpenL Translate pricing page listing Starter, Pro and Ultimate plans with credit and character limits

07

Merlin AI

1.4M/mo

Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.

AI AssistantFreemium+13.1%

Merlin AI Chrome extension sidebar summarizing a webpage

08

Lara Translate

982.4K/mo

Professional AI translation for text, documents, images and audio

AI TranslateFreemium, Paid, Contact for Pricing45% direct

Lara Translate showing translation memories, glossaries and style options

09

HARPA AI

537.5K/mo

Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.

AI AgentFreemium+99.3%

HARPA AI extension panel showing model selection and page-aware prompt shortcuts on a website

10

MachineTranslation.com

366.9K/mo

Free AI translator that cross-checks 22 models for one trusted translation

AI TranslateFreemium37% direct

MachineTranslation.com editor showing side-by-side translations from ChatGPT, Gemini, Claude and other models

11

Glarity

188.8K/mo

Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser

AI SummarizerFreemium7% direct

Screenshot of Glarity summarizing a YouTube video with timestamped highlights in the sidebar

12

Kome AI

174.9K/mo

Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.

AI SummarizerFreemium30% direct

Kome AI extension summarizing a long article and saving it to the bookmark library

#1

Visit

ChatGPT

6B/mo+2.2%

Official

SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.

AI Chatbot73% direct

Freemium

Visit

Claude

1.3B/mo+23.8%

Official

SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.

AI Assistant72% direct

Freemium

Visit

DeepL

95.1M/mo

Official

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

AI Translate63% direct

Freemium

Visit

Monica

4.5M/mo

Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.

AI Assistant55% direct

Freemium

Visit

Immersive Translate

2.4M/mo

Bilingual AI translation for websites, documents, video and images

AI Translate75% direct

Freemium, Free Trial

Visit

OpenL Translate

1.5M/mo+8.8%

AI translation for text, images, documents and speech in 100+ languages

AI Translate26% direct

Freemium, Subscription

Visit

Merlin AI

1.4M/mo+13.1%

Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.

AI Assistant50% direct

Freemium

Visit

Lara Translate

982.4K/mo

Official

Professional AI translation for text, documents, images and audio

AI Translate45% direct

Freemium, Paid, Contact for Pricing

Visit

HARPA AI

537.5K/mo+99.3%

Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.

AI Agent76% direct

Freemium

Visit

MachineTranslation.com

366.9K/mo

Free AI translator that cross-checks 22 models for one trusted translation

AI Translate37% direct

Freemium

Visit

Glarity

188.8K/mo

Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser

AI Summarizer7% direct

Freemium

Visit

Kome AI

174.9K/mo

Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.

AI Summarizer30% direct

Freemium

Fast Translator vs Sider

Side-by-Side Traffic & Specification Matrix

Fast Translator

Strengths & Pros

Limitations

Frequently Asked Questions: Fast Translator vs Sider

How do Fast Translator and Sider compare in monthly traffic?

How do their growth rates compare?

How does pricing compare?

What are alternatives to Fast Translator and Sider?

More Head-to-Head Matchups

Best Alternatives to Fast Translator & Sider (12)

Sider

Strengths & Pros

Limitations