Comparison

ChatPDF vs Trellis

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ChatPDF

This AI-powered tool allows you to ask questions and get summaries directly from your PDF documents. It supports multiple files, OCR, and multilingual interactions, making complex information easily accessible.

Highlights
  • Instant answers from PDFs
  • Quick document summaries
  • Chat with multiple PDFs
  • OCR for scanned documents
  • Multilingual support
  • Cross-device access
Features
Read full description

ChatPDF lets you ask questions, request summaries, or quickly find the information you need—powered by advanced AI that understands your documents. Simply upload your PDF and start chatting. Ideal for students, researchers, and professionals, ChatPDF helps you effortlessly grasp complex research papers, academic articles, or any document you care about. Key Features: • Instant Answers: Ask questions directly to your PDFs and receive accurate responses based entirely on your document's content. • Quick Summaries: Save time and boost your understanding with concise, clear summaries of lengthy texts. • Multi-PDF Chat: Manage multiple documents seamlessly by chatting with several PDFs at once. • OCR Support: Easily extract text from scanned documents or images, making even printed PDFs fully searchable. • Multilingual Support: Engage with your documents in any language, simplifying global research and collaboration. • Robust Data Security: Your privacy matters. ChatPDF keeps your documents confidential with advanced data protection measures. • Cross-Device Access: ChatPDF runs smoothly on phones, tablets, and desktops, providing seamless document interactions wherever you are. • Trusted by Experts: Used and trusted by researchers from renowned institutions such as Stanford and Harvard for reliable, swift document analysis. • Multiple File Formats: Beyond PDFs, ChatPDF supports a variety of file formats, giving you flexible document management options. https://chat-pdf.notion.site/ChatPDF-Terms-of-Service-6a422751d9b74ad8893dea50fd970270ChatPDF is your essential tool for smarter document engagement. Whether you're studying, preparing presentations, or simply trying to make sense of complex material, ChatPDF turns your documents into clear, insightful conversations. Download now and revolutionize the way you work with PDFs! Terms of service & privacy policy: https://chat-pdf.notion.site/ChatPDF-Privacy-Policy-45fa3cf8bac8483896eb09b108f0c0f2 https://chat-pdf.notion.site/ChatPDF-Terms-of-Service-6a422751d9b74ad8893dea50fd970270

About

Trellis

Features
Read full description

Turn a learning goal into your next action. Trellis brings study projects, daily tasks, a calendar, focus sessions and routines together. START WITH YOUR GOAL Create a project for an exam, a language, a skill or another learning goal. Add the resources you plan to use and the time you can give it. MAKE A PLAN YOU CAN FOLLOW Use AI planning to build a study schedule around your goal and resources. Preview each change to your plan, and undo it if it isn't right. SEE TODAY CLEARLY Find today's tasks, mark individual activities complete and see at a glance whether the day fits your time. Keep several learning projects within reach. STUDY WHERE YOUR MATERIAL IS Link mimosa documents, Seeds and Lotus decks to a project and open them from Today. Results come back to your plan. KEEP YOUR THINKING WITH THE PROJECT Save observations and useful information in project notes, alongside your learning resources. GIVE YOUR GOAL YOUR ATTENTION Start a focus session, track time spent studying and maintain daily routines. Designed for iPad and iPhone. Available in ten languages. AI planning requires internet access. Some features require an additional purchase; see the in-app offer for current availability and terms. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them anytime in Settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ymelihbozgeyik.github.io/trellis-support/privacy/

Screenshots

ChatPDF3 screens
Trellis4 screens

Verdict

The call

The clearest difference is ads: Trellis at none against ChatPDF's shown. ChatPDF's advantage is iOS requirement (15.6 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ChatPDF sells 2 in-app purchases, starting at $14.99 per month and Trellis sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

ChatPDF ships an update every 4 days, Trellis every 5 days. The most recent releases landed on October 16, 2026 and October 13, 2026 respectively.

Scorecard2 real differences · 8 level
ChatPDF versus Trellis: the parameters behind the verdict, then further details
ParameterChatPDFTrellis
PriceFreeFree
Rating4.6 (92 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings92 — better—
Update frequencyEvery 4 days — betterEvery 5 days
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.6 — better17.0
Further details — not scored
Size41 MB31 MB
Age rating4+4+
DeveloperChatPDF GmbHYusuf Melih Bozgeyik

In-app purchases

2 purchases

ChatPDF

Subscriptions2
  • Monthly Plus Subscription$14.991 Month
  • ChatPDF Yearly Plus Plan$89.991 Year
6 purchases

Trellis

Subscriptions3
  • Trellis Base$4.991 Month
  • Trellis Max7 Days trial$9.991 Month
  • Trellis Ultra$19.991 Month
One-time3
  • 50 Credit$3.99
  • 150 Credit$8.99
  • 400 Credit$17.99

Questions

Is ChatPDF free?
ChatPDF is free to download, with in-app purchases available.
Is Trellis free?
Trellis is free to download, with in-app purchases available.
Do ChatPDF or Trellis have ads?
ChatPDF shows ads; Trellis does not.
Which is updated more often, ChatPDF or Trellis?
ChatPDF ships an update every 4 days, and Trellis every 5 days. Most recently, ChatPDF was updated on October 16, 2026 and Trellis on October 13, 2026.

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