OpenTime vs Markflow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenTime
Quickly find your open time slots by analyzing your device calendars. This app offers flexible date range views, slot duration selection, and convenient sharing options without requiring accounts or tracking your data.
- View free/busy slots for any date range
- Slot duration picker with chip subdivision
- Quick sharing of daily availability
- Customizable appearance (light/dark/system)
- Pinned queries for one-tap access
- Home screen widgets and Live Activities
- Apple Watch companion app
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Quickly see when you're free. Open Time reads your device calendars and shows your open time slots. No accounts, no servers, no tracking. FEATURES - View free and busy slots for today, tomorrow, or any date range - Choose which calendars count: exclude holidays, sports schedules, or shared calendars, and every list, widget, and share reflects only the calendars you pick - Slot duration picker (15, 30, or 60 minutes). Chips subdivide your free blocks at the chosen interval - Long-press any chip for Open in Calendar, Create Event Here, or Copy Time - Long-press any day name to Share or Copy that day's availability to anywhere (Messages, Mail, Notes) - Light, dark, or system appearance with an in-app picker - Pull to refresh, and availability refreshes automatically after you create or edit an event - Show or hide busy events - Toggle weekends on or off - This Week, Next Week, and Next 14 Days quick picks - Custom date range picker - Home screen widgets (small and medium). Tap any chip to jump straight to that slot in the app - Live Activities and Dynamic Island for real-time free/busy on your lock screen - Apple Intelligence query bar on supported devices: type "tomorrow afternoon for 30 min" or "any hour Friday afternoon" and get the matching slots - Siri and Shortcuts: try "What's my availability in Open Time" or "When am I free in Open Time" - Apple Watch companion to check your week from your wrist - Share Extension to drop your availability into any app from the share sheet - iMessage app to pick days and send your availability without leaving the conversation PRIVACY FIRST Your calendar data stays on your device. No accounts. No analytics. No third-party servers. Zero data collection. Open Time uses Apple's EventKit to read your calendars locally. Nothing ever leaves your device. Perfect for freelancers, consultants, and anyone who needs to quickly share when they're available.
Markflow
This app allows you to open and read markdown files from various sources like Files, Mail, and Safari. It supports GitHub-flavored markdown, code syntax highlighting, and diagrams, with an integrated editor and a clean preview mode.
- Open .md, .markdown, .mdown files
- GitHub-flavored markdown rendering
- Syntax-highlighted code blocks
- Mermaid diagram support
- Markdown editing toolbar
- Pinch to zoom
- Export edited files
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The markdown reader you've been missing. Markflow opens .md files from Files, Mail, Safari downloads, or the share sheet and renders them properly. GitHub-flavored markdown, syntax-highlighted code, mermaid diagrams, tables, task lists, and more. Originals are never touched. Edits live in memory until you explicitly Save, Save as New File, or Share a copy. WHAT YOU CAN DO • Open any .md, .markdown, or .mdown file from any app • Read with a clean, native preview • Edit with a markdown toolbar above the keyboard. Bold, italic, headings, lists, links, images, code, quotes, all one tap away. • Pinch to zoom in both Preview and Edit • Export an edited copy via the system share sheet • Tap Create to start a new blank file, or "Welcome to Markflow" for a full feature tour WHAT IT RENDERS • Headings, lists, blockquotes, links, images • Syntax-highlighted code blocks • Mermaid flowcharts and diagrams • GitHub-flavored markdown tables • Task lists with checkboxes • Inline images (absolute URLs) PRIVACY Markflow makes zero network requests and collects zero data. No accounts. No login. No analytics. No tracking. No ads. The renderer is a sandboxed local file with a Content Security Policy that blocks all remote resources. Your files stay on your device. DESIGN Built native with SwiftUI and the Liquid Glass nav bar. Light and dark mode. Adaptive home screen. Stock Apple Human Interface Guidelines throughout. WHO IT'S FOR • Writers who keep notes in markdown • Developers reading READMEs and docs on the go • Anyone who's been emailed a .md and had nowhere to open it • People who want a markdown reader that does one thing well Open source. MIT licensed. github.com/madebysan/markflow
Screenshots
Verdict
The clearest difference is price: Markflow at Free against OpenTime's $0.99. OpenTime's advantage is update cadence (every 2 days vs fortnightly). On rating, ratings volume, ads and in-app purchases 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
Markflow is free to download; OpenTime costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for OpenTime against 5.0 for Markflow. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
OpenTime ships an update every 2 days, Markflow fortnightly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | OpenTime | Markflow |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 2 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 26.2 | 26.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | james tannahill | Santiago Alonso Alexandre |
Customer experience
OpenTime
Markflow
In-app purchases
OpenTime
No in-app purchases
Markflow
No in-app purchases









