Comparison

OpenMark vs OneUptime On

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

Head to head
About

OpenMark

View and render markdown files with advanced features like Mermaid diagrams and LaTeX math. Supports various themes, code highlighting, and offline access. Ideal for developers and writers working with markdown on iOS devices.

Highlights
  • Mermaid diagram rendering
  • LaTeX math support
  • Code block highlighting
  • GitHub-style alerts
  • Interactive checkboxes
  • Offline functionality
  • Multiple themes
Features
Read full description

OpenMark is a beautiful markdown reader for iPhone and iPad. Open any .md or .mdx file and see it rendered with full typography, Mermaid diagrams, LaTeX math and interactive checkboxes. The perfect companion to OpenMark for Mac — or a standalone reader for anyone who works with markdown. FEATURES • Beautiful rendered view with full markdown support • Mermaid diagrams — flowcharts, sequence, class, Gantt and Kanban rendered inline • Math and LaTeX — KaTeX rendering for equations, subscripts and matrices • Code blocks highlighted in 30+ languages • GitHub-style alerts — NOTE, TIP, IMPORTANT, WARNING and CAUTION callouts • Wiki-style [[links]] between documents • 4 themes — Default, Nord, Solarized Dark and One Dark • Interactive checkboxes — tap to toggle task list items • Find in page — search within your document • Reading time and document info • Export and print — share as PDF, HTML, or send to any app • Adjustable font size • Outline sidebar on iPad — jump to any heading • Opens files from iCloud Drive, Google Drive, Dropbox and Files • Spotlight indexing — find recently opened documents from Search • Home Screen Quick Actions — jump to recent files from the app icon • Dark and light mode, following your system setting • Works completely offline — no internet required DESIGNED FOR iPAD On iPad, an outline sidebar sits alongside your document for quick navigation through long files. Find in page works with ⌘F on an external keyboard. PERFECT FOR • Reading README files and documentation on the go • Reviewing markdown drafts from your Mac • Opening .md files from any cloud service or app Also available on Mac with full editing.

About

OneUptime On

Monitor and manage your online services with this comprehensive solution. It alerts your team to downtime and keeps customers informed via a status page.

Highlights
  • Monitor website availability
  • Track dashboard status
  • Check API uptime
  • Receive downtime alerts
  • Publish status pages
Features
Read full description

OneUptime is a comprehensive solution for monitoring and managing your online services. Whether you need to check the availability of your website, dashboard, API, or any other online resource, OneUptime can alert your team when downtime happens and keep your customers informed with a status page.

Screenshots

OpenMark4 screens
OneUptime On4 screens

Verdict

The call

The clearest difference is price: OneUptime On at Free against OpenMark's $9.99. OneUptime On also leads on update cadence (every 6 days vs every 6 months) and iOS requirement (16.4 vs 18). OpenMark's advantage is chart position (#52 vs unranked). 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

OneUptime On is free to download; OpenMark costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

OpenMark ships an update every 6 months, OneUptime On every 6 days. Both last shipped on November 5, 2026.

Scorecard5 real differences · 6 level
OpenMark versus OneUptime On: the parameters behind the verdict, then further details
ParameterOpenMarkOneUptime On
Price$9.99Free — better
Rating—5.0 (1 ratings) — better
Positive reviews71.4% of reviews—
Number of ratings—1 — better
Update frequencyEvery 6 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#52 — better—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS1816.4 — better
Further details — not scored
Size8 MB40 MB
Age rating4+4+
DeveloperRotate, LLC.HackerBay, Inc.

Customer experience

OpenMark

Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

OneUptime On

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

OpenMark

No in-app purchases

None

OneUptime On

No in-app purchases

Questions

Is OpenMark free?
OpenMark costs $9.99, with no in-app purchases.
Is OneUptime On free?
OneUptime On is free to download, with no in-app purchases.
Do OpenMark or OneUptime On have ads?
Neither OpenMark nor OneUptime On shows ads.
Which is updated more often, OpenMark or OneUptime On?
OpenMark ships an update every 6 months, and OneUptime On every 6 days. Most recently, OpenMark was updated on November 5, 2026 and OneUptime On on November 5, 2026.

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