Dev tools · alternatives · 2026

24 alternatives to Sioyek

Academic PDF Viewer

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Sioyek launched in 2022; newer entries below may have overtaken it.

1. 1
   Sioyek – PDF viewer for reading research papers and technical documents▲272

   2021 · sioyek.info · its alternatives →

2. 2
   Sioyek – PDF viewer for reading research papers and textbooks▲238

   Some of the features: * Quickly preview or jump to figures/references/equations/etc. (even if the PDF doesn't have links) * Search paper names in google scholar by middle clicking on their name * Searchable table of contents * Searchable highlights/bookmarks * Browser-like history navigation * Mark locations for quick navigation (Vim style) * Synctex support Video demo of some features: https://www.youtube.com/watch?v=yTmCI0Xp5vI

   2022 · github.com · its alternatives →

3. 3
   Siftery▲1,018

   Share products you use at work,explore what others are using

   2016 · siftery.com · its alternatives →

4. 4
   Kdan Mobile PDF Reader▲97

   PDF editor designed for all the ways you work

   2020 · pdf-reader.kdandoc.com · its alternatives →

5. 5
   Arxiv Vanity – Read academic papers from Arxiv as responsive web pages▲721

   2017 · arxiv-vanity.com · its alternatives →

6. 6
   Academus▲67

   Read research papers as interactive webpages

   2021 · academ.us · its alternatives →

7. 7
   ScholArxiv – an open-source, aesthetic, minimal research paper explorer▲147

   OpenScholarXIV is an open-source, aesthetic, minimal and AI powered app that allows users to search, read, bookmark, share, download and view summaries of academic papers from the arXiv repository. - ScholarXIV/OpenScholarXIV

   2024 · github.com · its alternatives →

8. 8
   HTML visualization of a PDF file's internal structure▲451

   Hi, I've just finished a rebuild of this function and added a lot of new features: info, page index, minimap, inverted index,... I think it may be useful for inspection, debugging or just as a learning resource showcasing the PDF file format. This is a pet project and I would be happy to receive some feedback! Regards

   2025 · github.com · its alternatives →

9. 9
   IPA, a GUI for exploring inner details of PDFs▲270

   GUI analyzer for deep-diving into PDF files. Detect malicious payloads, understand object relationships, and extract key information for threat analysis. - seekbytes/IPA

   2024 · github.com · its alternatives →

10. 10
    ReadHere▲146

    Lightweight PDF & EPUB reader in your browser

    Jun 2026 · readhere.app · its alternatives →

11. 11
    PDF Viewer▲161

    Read, review, and annotate PDFs with ease

    2016 · pdfviewer.io · its alternatives →

12. 12
    PDF Expert for Mac▲187

    The best PDF viewer, editor, and form filler available.

    2015 · apps.apple.com · its alternatives →

13. 13
    Scholaread▲66

    Mobile academics: diagrams, formulas and readability

    2023 · scholaread.com · its alternatives →

14. 14
    Polar 2.0▲182

    Organize and prioritize your reading.

    2020 · its alternatives →

15. 15
    Google PDF Viewer▲61

    Google's PDF reader for Android

    2015 · play.google.com · its alternatives →

16. 16
    Litmaps – Visual Research Discovery Tool▲116

    Your Literature Review Assistant — Discover literature and accelerate your entire research process with the most powerful visual search tool.

    2021 · app.litmaps.co · its alternatives →

17. 17
    heißdocs▲101

    Open source & self hosted document query engine

    2023 · github.com · its alternatives →

18. 18
    Notable PDF▲83

    Cloud-based PDF Viewer and Annotation

    2015 · kamiapp.com · its alternatives →

19. 19
    PDF Search for Mac▲81

    Search multiple documents insanely fast

    2017 · pdfsearchapp.com · its alternatives →

20. 20
    PDF Viewer▲3

    Fast PDF Reader for Android Phones & Tablets

    Jul 2026 · deepakpk.com · its alternatives →

21. 21
    PDFun▲17

    All-in-One PDF Tools and Services for Your Needs

    2025 · pdfun.xyz · its alternatives →

22. 22
    NowLedge▲68

    Take notes easily from your books in PDF

    2021 · nowledge.xyz · its alternatives →

23. 23
    Rag Document Viewer▲22

    High‑Fidelity Document Viewer for RAG Apps

    2025 · github.com · its alternatives →

24. 24
    Pdf.js-based real-time collaborative viewer for Chrome▲61

    2014 · chrome.google.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →