ChatPDF vs Resoomer (2026): which should you pick?
As of Nov 13, 2026, we pick ChatPDF: it is second in our ranking of AI research tools, though Resoomer grades higher (3.2 against 2.8) on value for money and the free plan.
Checked Oct 5, 2026 and Nov 13, 2026 · graded Oct 10, 2026 and Nov 13, 2026 by ToolGPA
ChatPDF grades higher on platforms. They get the same grade on features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
ChatPDF
Ask questions about PDFs and get answers with citations
Which one is for you
Pick ChatPDF if
- Fits if you want quick answers from a paper or a textbook chapter, with no sign-up
- Works for students turning course notes into flashcards for Anki or Quizlet
Look elsewhere if
- Tight if you're staying free, at 2 documents and 20 messages a day, files of 120 pages and folders of 5
- Skip it if you want a full literature search, as its paper summaries are built from abstracts only
- Watch out: chatting with a full paper works only for open-access papers
- Not for you if you want the price in writing first, since the website sets Plus prices per visitor
- Pricey if you pay monthly, at $14.99 on the US App Store against $89.99 for the year
Pick Resoomer if
- Fits if you want a quick summary of an article with no sign-up
- Works for rewording or translating a passage in the browser
Look elsewhere if
- Skip it if you want answers with sources, as the summaries come with no citations
- Not for you if you want to manage papers or citations, because it does neither
- Too light for chatting with a document, as it is not a chat assistant
- Watch out: texts are deleted after processing, so export or save results yourself
How we grade them
| 2.8GPAChatPDFGood | 3.2GPAResoomerVery good | |
|---|---|---|
| Value for money | BPlus is $89.99 a year on the US App Store, about $7.50 a month, the low end of this category, and it lifts the caps on questions, documents and file size altogether. Pay monthly and it's $14.99. The wrinkle: the website sets Plus prices per visitor, so web checkout may not match. | AFree with no account and no stated usage limit, across all eight tools. Category tools start at $7.92 a month for the cheaper quarter. |
| Free plan and trial | CYou can use it without making an account at all. The caps are the ordinary sort, though: 2 documents and 20 messages a day, files of 120 pages or 10 MB, folders of 5 files. One evening of reading and you're done. The better model is kept for Plus. | AEverything is free, including the browser extensions and the Reflex app, and the pages show no cap. |
| Features | CChat beside the page with clickable citations, folders to ask across files, YouTube and website links, flashcards, slides, a writer. The gaps are the listing's own, and they sit in the research half: paper summaries are built from abstracts, and full-paper chat only works on open-access papers. | CSummarizer, document upload, rewriter, translator and spell checker. It does those jobs fully, but they are small ones: no library, no citations, no chat. |
| Ease of use | BNo store rating on record, so the B rests on the listing: open the site, drop in a PDF, start asking, no account needed. Folders and saved history are the only parts that want you signed in. | BNo rating on record, but you paste text and get a result with no account. |
| Platforms and integrations | AWeb, Mac, Windows, iPhone and Android, plus a developer API. Flashcards export to Anki, Quizlet and Brainscape, slides to PowerPoint, writing to Word or Markdown. | BWeb, browser extensions, and iOS and Android through the Reflex app. No API is listed. |
| Best for | quick answers from a PDF, no sign-up | free text summaries and rewrites |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: ChatPDF and Resoomer. How we grade
Price against what you get
ChatPDF starts at $7.50 a month when paid by the year and scores 3.0 out of 4 on features, ease of use and platforms. Resoomer has no paid plan and scores 2.7.
ChatPDF scores higher, and starts $7.50 a month higher: the question is whether the extra is worth that to you. Of the other AI research tools on the chart, none scores higher than ChatPDF for less, and none scores higher than Resoomer for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- ChatPDF also covers chat assistant, AI search, research and citations.
- Resoomer also covers documents, grammar & style and text to speech.
At a glance
| ChatPDF | Resoomer | |
|---|---|---|
| Pricing | Free plan | Free |
| Starts at | $89.99 per year or $14.99 per month (US App Store in-app purchase) | Free |
| Free plan | 2 documents a day, usable without an account. A free account adds saved history and multi-file folders. Free files are capped at 120 pages or 10 MB. | Every tool is free, with no account required and no character limit, according to the Resoomer site and its Reflex app page. |
| Free trial | None listed | None listed |
| Web | ||
| macOS | ||
| Windows | ||
| iOS | ||
| Android | ||
| Browser extension | ||
| Made by | ChatPDF GmbH | Resoomer |
| Price read from | apps.apple.com | resoomer.com |
| Checked | Oct 5, 2026 | Nov 13, 2026 |
Worth knowing
ChatPDF
- The website shows Plus prices only in an upgrade dialog and sets them per visitor; the prices here are US App Store in-app purchases, and web checkout may differ.
- The free plan covers 2 documents a day, and the site's limits cap free use at 20 messages a day and files of 120 pages or 10 MB.
- AI Research summaries are built from abstracts, and chatting with a full paper works only for open-access papers.
- The best model is reserved for Plus; ChatPDF says it routes queries between GPT-4o and GPT-4o-mini.
Resoomer
- It is a set of single-purpose text tools, not a chat assistant, and it does not manage a library of papers or citations.
- Texts are deleted after processing, so results must be exported or saved by the user.
- The site gives no sources or citations for the summaries it produces.
- The site's page code still carries a monthly premium price variable, but no paid plan is shown on any page read.
Key features
ChatPDF
- Chat with documents
- Ask questions about a PDF, Word, PowerPoint, Markdown or text file with the chat and the document side by side. Clickable citations scroll to the passage an answer came from.
- Multi-file folders
- Put files in a folder to ask questions across all of them in one conversation. Folders and saved chat history need a free account.
- AI Research
- Ask a question to find academic papers and get a summary with citations, built from the papers' abstracts. Filters narrow results to recent or influential work.
- YouTube and website chat
- Paste a YouTube or website link to ask questions about it. Video answers include clickable timestamps and an interactive transcript.
- Flashcards, slides and writing
- Makes flashcards that export to Anki, Quizlet, Brainscape or CSV, and slides that export to PowerPoint. The AI Writer drafts text with citations and exports to Word or Markdown.
- Developer API
- A backend API adds PDFs by URL or file upload and answers questions about them, with optional page references. API files are limited to 2,000 pages or 32 MB.
Resoomer
- Summarizer
- Condenses a pasted text, an uploaded document or a web page into its main points, with no character limit stated on the site.
- Document upload
- Accepts PDF, EPUB, DOCX, ODT and TXT files, and the other tools can take a result as input.
- Rewriter, paraphraser and synonymizer
- Rewrite a text in another style, re-express its ideas, or swap words for simpler or richer ones.
- Text player
- Reads texts, documents and summaries aloud so they can be listened to instead of read.
- Translator and spell checker
- Translates documents and corrects spelling; the site says 66 languages are supported.
- Browser extensions
- Extensions for Chrome, Edge, Firefox, Opera, Brave and Vivaldi bring the tools to any web page.
Plans
ChatPDF
Free$0
2 documents and 20 messages a day, with files of up to 120 pages or 10 MB and folders of up to 5 files.
Plus$14.99
per month on the US App Store; $89.99 for the yearly plan
Unlimited questions and documents, files of up to 2,000 pages or 150 MB, 50 PDFs per folder and the higher-quality model.
Resoomer
Free$0
All eight tools, the browser extensions and the Reflex app, with no sign-up and no stated usage limit.
Ways to pay less
ChatPDF
- Annual discount
About 50% off with the yearly plan
On the US App Store the yearly Plus plan is $89.99 against $14.99 a month. That works out to about $7.50 a month, half the monthly rate.
Resoomer
No public discounts listed.
Common questions
Which is cheaper, ChatPDF or Resoomer?
As of Nov 13, 2026, Resoomer is cheaper to start with: it is free, against $7.50 a month when paid by the year for ChatPDF. ChatPDF starts at $89.99 per year or $14.99 per month (US App Store in-app purchase), and Resoomer is free.
Which has a free plan, ChatPDF or Resoomer?
As of Nov 13, 2026, both ChatPDF and Resoomer have a free plan.
Which platforms do ChatPDF and Resoomer run on?
As of Nov 13, 2026, only ChatPDF lists macOS and Windows apps and only Resoomer lists a browser extension. Both list a web app and iOS and Android apps. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.