ChatPDF vs ScienceOS vs ReadDocs vs LightPDF

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
ChatPDF
vs
Competitor 1
ScienceOS
Competitor 2
ReadDocs
Competitor 3
LightPDF
Compare
4 tools · best value per row highlighted
Your tool ChatPDF
chatpdf.com
ChatPDF is a document question-answering app: upload a PDF, ask questions in plain language, and get answers with built-in citations that point back to the source passage.
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Competitor ScienceOS
scienceos.ai
Researchers waste hours hunting through literature—piecing together fragments from different papers
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Competitor ReadDocs
readdocs.co.uk
Upload a PDF contract and ReadDocs spits out a one-minute summary, bullet points, and answers to specific questions you ask
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Competitor LightPDF
lightpdf.com
LightPDF AI for Docs is an online tool that utilizes artificial intelligence to summarize and extract insights from uploaded PDF, Word, Excel, and PPT documents. With multi-platform availability and s
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Traffic estimated monthly website traffic
Monthly visits
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64.9Kvisits/mo
744visits/mo
1.8Mvisits/mo
MoM change
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▼ 6.2%
▲ 141.6%
▲ 1.0%
6-month growth
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+1.2%
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-4.4%
Global rank web
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#464,304
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#34,433
Avg. last 3 months
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68.2K
384
1.7M
Bounce rate lower is better
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39%
39%
51%
Pages / visit
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3.7
1.1
2.3
Visit duration
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1m 37s
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1m 31s
Traffic sources
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● Direct 98% · ● Mail 2%
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● Direct 88% · ● Referral 10%
ChatPDFScienceOSReadDocsLightPDF
0477.3K954.5K1.4M1.9MScienceOS · 79.4KScienceOS · 75.1KScienceOS · 79.7KScienceOS · 64.1KScienceOS · 64.5KScienceOS · 56.4KScienceOS · 70.5KScienceOS · 69.2KScienceOS · 64.9KReadDocs · 101ReadDocs · 308ReadDocs · 744LightPDF · 1.6MLightPDF · 1.6MLightPDF · 1.9MLightPDF · 1.7MLightPDF · 1.9MLightPDF · 1.9MLightPDF · 1.8MLightPDF · 1.5MLightPDF · 1.8MLightPDF · 1.8M1001K10K100K1M10MScienceOS · 79.4KScienceOS · 75.1KScienceOS · 79.7KScienceOS · 64.1KScienceOS · 64.5KScienceOS · 56.4KScienceOS · 70.5KScienceOS · 69.2KScienceOS · 64.9KReadDocs · 101ReadDocs · 308ReadDocs · 744LightPDF · 1.6MLightPDF · 1.6MLightPDF · 1.9MLightPDF · 1.7MLightPDF · 1.9MLightPDF · 1.9MLightPDF · 1.8MLightPDF · 1.5MLightPDF · 1.8MLightPDF · 1.8MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Free
Freemium
Freemium
Freemium
Starting price
Free
€7.25per month · free tier available
Free tier
$1.33per month · free tier available
Free tier
Free trial
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API access
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Plans
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Free FreeAngel €7.25/moTeam €6/moInstitution Custom
Free FreePro £9.99/moBusiness £29/mo
Free FreeMonthly $5.99/moYearly $15.99/yrLifetime $39.99
Capabilities input → output
Input
DocumentsTextWeb pages
DocumentsText
DocumentsImagesText
DocumentsWeb pages
Output
Text
DataText
Text
Text
Skill level
Beginner-friendly
Intermediate
Beginner-friendly
Beginner-friendly
Categories
Education & LearningProductivity & OfficeResearch & AnalyticsWriting & Content+4 more
Research & AnalyticsAI Research PapersAI Research Tool
Productivity & OfficeWriting & ContentAI PDFAI Summarizer
Productivity & OfficeWriting & ContentAI Document ExtractionAI PDF+1 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
12
8
13
9
PDF analysis
Document summarization
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Summarizing
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Interactive PDF processing
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PDF summaries
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PDFs
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Research
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OCR
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Summaries
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Data extraction
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Document chat
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Document data extraction
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Document q a
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Document summaries
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Scientific q a
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Citations
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Official documents q a
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PDF translations
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Research papers
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Scientific literature exploration
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Text extraction
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Academic research
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Document processing
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Document reading
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Homework assistance
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Literature analysis
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Meeting summaries
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Network diagrams
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YouTube summaries
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
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Saves
0
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Reviews
0
0
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Prompts
0
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Verified listing
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.