LightPDF records 1,742,568 monthly visits with -15.3% month-over-month growth and Freemium pricing. Thinkstack.ai records 917 monthly visits with -47.4% growth and Freemium pricing.
Free AI-powered PDF editor, converter and reader for every device
Build custom AI chatbots and agents trained on your own data
| Dimension / Metric | | |
|---|---|---|
| Official Domain | lightpdf.com | app.thinkstack.ai |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 1.74M (1,742,568) | 917 (917) |
| MoM Traffic Delta | -314.58K (-15.3%) | -828 (-47.4%) |
| Primary Market & Share | 🇮🇳 India (24.9%) | 🇺🇸 United States (48.2%) |
| Direct Visits / mo | 442.07K | 367 |
| User Rating | 4.2 | 4.1 |
| Supported Platforms | Website | Website |
Free AI-powered PDF editor, converter and reader for every device
Upload a PDF and ask questions in natural language, follow up on details and see which passages the answers came from. A separate chat mode works with YouTube videos.
Translate whole documents, including scanned and image-based PDFs, into 20+ languages while keeping the original formatting and layout intact.
Convert invoices, receipts, bank statements and purchase orders into structured, editable Excel files automatically.
Edit text and images, OCR scanned pages, convert to and from Office formats, then merge, split, compress, watermark, sign and annotate.
Build custom AI chatbots and agents trained on your own data
Create fully functional AI agents in seconds from a visual, no-code interface without engineering help.
Connect multiple data sources so the bot answers from your own documents, help content, and websites.
Automate customer actions and build autonomous systems that require minimal human oversight.
Move complex chats to live agents and collect structured data through chat-based forms.
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.
SpecialistEnterprise-grade neural machine translation, AI writing refinement, and real-time voice translation across thirty-plus global languages.
SpecialistEnterprise-grade neural machine translation, AI writing refinement, and real-time voice translation across thirty-plus global languages.
Offers a completely free PDF editing and AI assistant experience, but lacks some of LightPDF's cloud-native collaboration features.
Offers a robust desktop suite for OCR and editing, but requires software installation unlike cloud platforms.
Offers a robust desktop suite for OCR and editing, but requires software installation unlike cloud platforms.
Provides quick browser-based PDF editing and e-signatures, but has a less advanced conversational AI assistant.
Provides quick browser-based PDF editing and e-signatures, but has a less advanced conversational AI assistant.
Provides a more polished cross-platform desktop PDF editing suite, but requires a paid upgrade for full AI features.
Offers a streamlined conversational interface for querying PDFs, but provides fewer document editing and conversion utilities.
AI customer service that answers instantly and turns chats into revenue
AI customer service that answers instantly and turns chats into revenue
Custom AI agents trained on your documentation and knowledge base
Custom AI agents trained on your documentation and knowledge base
Excels at developer API integration and chatting with PDFs, but lacks comprehensive traditional PDF editing tools.
Custom AI support chatbots trained on your own website content
Custom AI support chatbots trained on your own website content
