MermaidEditor vs Prompt 3
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MermaidEditor
Create and edit diagrams and charts using mermaid-js syntax with real-time preview. Export your creations as PNG or SVG files and share them across all your Apple devices.
- Mermaid-js syntax highlighting
- Code completion
- Instant preview
- Export to PNG/SVG
- Cross-device editing
- QuickLook preview extension
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MermaidEditor is a diagram and chart editor, powered by mermaid-js. And MermaidEditor supports iPhone, iPad and Mac, with one app you can edit diagram everywhere on any device. MermaidEditor supports mermaid-js syntax highlighting and code completion, so it can help writing diagram and chart clearly, easily and quickly. You can also easily export charts as PNG images or SVG files from the editor, or share image to other people with system actions. √ All Platforms - Both Mobile and Desktop platforms supported, you can edit diagram documents on iPhone, iPad or Mac - Document browser based app, easily edit files on device and sync document between devices - Multiple windows ready, it makes the editor more powerful on iPadOS - Keyboard shortcuts ready on iPadOS with keyboard connected √ Powerful Editor - Syntax Highlighting for mermaid-js grammar - Auto Completion in editor helps typing keywords quickly - Code Snippets likes parallel block in sequence diagram makes life easier - Instant Parsing Error indicator for locating syntax error √ Instant Preview - Auto Generated Preview when typing in editor - Zoom and Pan to move preview for checking diagram's detail - With Scroll wheel it can be easily zoom diagram on macOS √ Integrated Extensions - Thumbnail support, every .mmd file will has its own thumbnail when saving file - QuickLook Preview extension helps you preview mermaid document in Files app on iPhone or iPad and Finder on macOS √ Sharing - Save diagram document as its source with .mmd extension - Export diagram to PNG image or SVG file with one click For mermaid-js grammar, please visit https://mermaid-js.github.io/mermaid/ for documentation.
Prompt 3
A fully-native terminal emulator for Apple devices, offering robust connectivity for SSH, Mosh, and more. It features fast emulation, customizable clips, secure authentication, and cross-device syncing for a seamless experience.
- Native terminal emulator
- SSH, Mosh, Eternal Terminal, Telnet support
- Panic Sync for cross-device server syncing
- Superfast emulation with GPU acceleration
- Customizable clips for commands
- FaceID/TouchID authentication
- Jump Hosts and Agent Forwarding
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Prompt 3 is our #1 fully-native terminal emulator for Mac, iPhone, iPad, and now, Apple Vision Pro! Yes, with one purchase, you get four platforms. Supporting SSH, Mosh, Eternal Terminal, Telnet, and Local Shells (on Mac), you can stay connected even on the most unstable networks. And with Panic Sync, your servers sync everywhere. For terminals, this is the only app you need. NOW EVEN BETTER: • SSH, Telnet, and Local (for Mac) Rock-solid and reliable connectivity to your hosts. • Mosh and Eternal Terminal Keep your terminal open even when you get disconnected. Mosh is optimized for high-latency, low-throughput networks. Eternal Terminal is great for when you need to keep your full terminal history on a flaky connection. • Lower Price Everything is so expensive right now. So we made Prompt cheaper. Take that, capitalism. • Superfast Emulation We retooled the text engine in Prompt 3 to be up to 10x faster, including GPU acceleration, and with improved terminal emulation, you can run nvim inside tmux without breaking a sweat. • Clips Put your most-used commands and text bits into clips and access them with a single tap via Prompt’s keyboard bar. Clips can be stored globally or per-server. • Secure Enclave Authenticate with FaceID and TouchID. The keys will stay secure on your device. • Panic Sync Sync your favorite servers, passwords, private keys, and clips, between Prompt on all of your devices. • Customizable Make Prompt perfect with new themes, fonts, and a very configurable iOS keyboard. • Jump Hosts and Agent Forwarding Access corporate servers, even at the beach. • Mouse Support Use your mouse to interact with TUI-based apps that run through the terminal. AND YES, A DARK ICON. What more can we say? TAKE CONTROL FROM ANYWHERE, INCLUDING YOUR MAC AND APPLE VISION PRO. WE HOPE YOU ENJOY PROMPT 3. © Panic EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Prompt 3 at Free against MermaidEditor's $3.99. Prompt 3 also leads on rating (4.3 vs 2.3) and ratings volume (376 vs 10). MermaidEditor's advantage is in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 6 weeks). On review sentiment, ads, monetization model 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
Prompt 3 is free to download; MermaidEditor costs $3.99 up front. Prompt 3 sells 2 in-app purchases, starting at $9.99 per year. MermaidEditor asks for nothing beyond the download.
Prompt 3 holds the better App Store score, 4.3 against 2.3. That said, the two scores are not equally well evidenced: Prompt 3 has 376 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 14% of MermaidEditor's written reviews are positive against 22% of Prompt 3's.
MermaidEditor ships an update every 3 weeks, Prompt 3 every 6 weeks. Both last shipped on October 27, 2026.
| Parameter | MermaidEditor | Prompt 3 |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 2.3 (10 ratings) | 4.3 (376 ratings) — better |
| Positive reviews | 13.8% of reviews | 21.7% of reviews — better |
| Number of ratings | 10 | 376 — better |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Best chart rank | #116 | #26 — better |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, Mac, Vision Pro |
| Requires iOS | 14.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 125 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | 基伟 徐 | Panic, Inc. |
Customer experience
MermaidEditor
Prompt 3
Bugs and requests
MermaidEditor
Not enough reviews yet to summarise bugs or requests.
Prompt 3
Reported bugs
5 issues- Server list randomly disappears with Panic Sync
- Crashes when connected to external monitor
- Black screen issues with custom font configurations
- Sync issues causing data loss
- Vertical display sync issues
Requested features
8 requests- Shortcuts support on macOS
- Ability to click and select within commands
- Local shell option
- Run clips on server connection
- Export/backup clips
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- Alt/Meta key support for Emacs
- iCloud sync option
- Sign in with Apple for Panic Sync
In-app purchases
MermaidEditor
No in-app purchases
Prompt 3
- Prompt 3 iOS + Mac (Annual)7 Days trial$9.991 Year
- Prompt 3 One Time$49.99
Questions
Is MermaidEditor free?
Is Prompt 3 free?
Which has better reviews, MermaidEditor or Prompt 3?
Do MermaidEditor or Prompt 3 have ads?
Which is updated more often, MermaidEditor or Prompt 3?
Which is more popular, MermaidEditor or Prompt 3?
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