Comparison

Logseq vs HTML Previewer

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

Head to head
About

Logseq

This open-source outliner helps you write, organize, and share your thoughts using local Markdown and Org-mode files. Manage tasks, build a digital garden, and integrate with various services for enhanced productivity.

Highlights
  • Backlinks
  • Knowledge Graph
  • Page and block references
  • Tasks & Todos
  • SRS Cards
  • Zotero integration
  • Audio recorder
Read full description

Logseq is a joyful, open-source outliner that works on top of local plain-text Markdown and Org-mode files. Use it to write, organize and share your thoughts, keep your to-do list, and build your own digital garden. Logseq includes the following features: 1. Backlink 2. Knowledge Graph 3. Page and block references 4. Page and block embeds 5. Tasks & Todos 6. SRS Cards 7. Zotero integration 8. Youtube, Twitter, etc. integration 9. Audio recorder 10. Powerful queries 11. Whiteboards

About

HTML Previewer

Read full description

Open received HTML and ZIP reports, read Markdown notes, and inspect JSON or YAML on iPhone and iPad. Files are processed on your device. Read the content, keep the formatting - View HTML layouts, graphics, and animations. - Read Markdown tables and highlighted code, with one-tap code copying. - Display Markdown math equations and Mermaid diagrams offline. - Browse HTML and Markdown pages inside ZIP reports with local CSS and image assets. - Search within HTML and Markdown, navigate headings, adjust reading appearance, and reopen at your saved reading position. Inspect JSON and YAML - Expand nested objects and arrays, search fields and values, and check highlighted source with line numbers. - Copy values or field paths and jump to the corresponding source line. - View and copy large JSON numeric IDs without rounding their digits. - Locate syntax errors by line and column. YAML also supports multiple documents. Import, organize, and share - Open files from Files, Mail, AirDrop, messaging apps, cloud drives, or other apps. Open/share menu availability depends on iOS and the source app. - Select multiple documents or ZIP packages. Update duplicates, keep both copies, or skip individual files, then review import results. - Paste HTML, Markdown, JSON, or YAML text to create a local preview. - Find saved files by filename, pin frequent documents, and rename display titles. - Share original files or complete ZIP packages. Export HTML and Markdown previews as PDF. - Try the built-in HTML, Markdown, JSON, YAML, and ZIP samples. Supported extensions: .html, .htm, .md, .markdown, .json, .yaml, .yml, and .zip. JSON and YAML previews are read-only and share the original file. JSONC comments and trailing commas are not supported. PDF export is available for HTML and Markdown. Privacy and purchase Files are processed on device; the app does not upload your files. No account or ads. Paid download with no subscription or in-app purchase. New HTML files, including HTML inside ZIP packages, open in Interactive mode with page JavaScript and external resources enabled. The HTML content can make network requests. Select Safe Preview to block page scripts and external HTTP/HTTPS resources. External navigation and form navigation remain blocked in both modes. Saved preview choices are preserved when reopening files.

Screenshots

Logseq4 screens
HTML Previewer4 screens

Verdict

The call

The clearest difference is price: Logseq at Free against HTML Previewer's $5.99. Logseq also leads on iOS requirement (14.0 vs 17.0). HTML Previewer's advantage is update cadence (every 4 days vs every 3 weeks). On ads, 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

Logseq is free to download; HTML Previewer costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Logseq ships an update every 3 weeks, HTML Previewer every 4 days. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

Scorecard3 real differences · 7 level
Logseq versus HTML Previewer: the parameters behind the verdict, then further details
ParameterLogseqHTML Previewer
PriceFree — better$5.99
Rating4.4 (252 ratings) — better—
Positive reviews58.7% of reviews—
Number of ratings252 — better—
Update frequencyEvery 3 weeksEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better17.0
Further details — not scored
Size62 MB9 MB
Age rating4+4+
DeveloperLogseq Inc.SHIFENG ZHANG

Bugs and requests

Logseq

Reported bugs

4 issues
  • Sync issues leading to data loss
  • Inconsistent behavior when creating new blocks
  • Cursor jumping issues when editing text
  • Disappearing UI elements on mobile

Requested features

4 requests
  • Add support for other cloud storage options (Dropbox, Google Drive, etc.)
  • Improve mobile UI and UX for better usability
  • Implement plugin support on mobile
  • Optimize performance for older devices

HTML Previewer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Logseq

No in-app purchases

None

HTML Previewer

No in-app purchases

Questions

Is Logseq free?
Logseq is free to download, with no in-app purchases.
Is HTML Previewer free?
HTML Previewer costs $5.99, with no in-app purchases.
Do Logseq or HTML Previewer have ads?
Neither Logseq nor HTML Previewer shows ads.
Which is updated more often, Logseq or HTML Previewer?
Logseq ships an update every 3 weeks, and HTML Previewer every 4 days. Most recently, Logseq was updated on October 7, 2026 and HTML Previewer on October 11, 2026.

Other comparisons