RADii Viewer vs Tertiary Markdown
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
RADii Viewer
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RADii Viewer is a real time AR/VR viewer for the RADii plugin (radii.info) for Rhino3D/Grasshopper3D (rhino3d.com). RADii is an open design and collaboration platform aimed at designers and architects. RADii Viewer enables you to subscribe and view content published from Rhino3D in real-time as it is being created, anywhere in the world. Content can be retrieved from a cloud server on demand as well as saved locally for future offline use. Subscribable content so far includes meshes, point clouds, curves/polylines, materials, messages, control and other users. You control the scale of the received content, general properties as well as the world it inhabits. The focus of the platform is direct project communication and collaboration for professionals and amateurs.
Tertiary Markdown
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Tertiary Markdown is a fast, native Markdown notes app for Mac, iPad, and iPhone. It manages your files and folders the way Obsidian does β open any local folder as a vault and your notes stay as plain .md files you fully own. KEY FEATURES β’ Open any folder as a vault β fully compatible with your existing Obsidian vault. Your notes are plain Markdown files, never locked into a proprietary format. β’ File & folder management β browse, create, rename, and delete notes and folders from a clean sidebar. β’ Live preview editor β switch instantly between Edit, Split, and Preview. Your work autosaves as you type. β’ Images, Bear-style β embed pictures with standard Markdown  or Obsidian ![[image.png]] embeds, rendered inline. β’ Tables, Notion-style β GitHub-flavoured tables render as clean, bordered grids. β’ Everyday Markdown β headings, bold and italic, links, checklists, bullet and numbered lists, block quotes, and code blocks. β’ One app, every device β a true native experience on macOS, iPadOS, and iOS. Your notes never leave your device. Everything is stored as simple text files on your Mac, iPad, or iPhone, so you stay in control and your library is future-proof. Whether you keep a personal knowledge base, take meeting notes, or write long-form drafts, Tertiary Markdown gives you a distraction-free, Markdown-first workspace that travels with you.
Screenshots
Verdict
The clearest difference is device support: RADii Viewer at 4 against Tertiary Markdown's 2. RADii Viewer also leads on iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | RADii Viewer | Tertiary Markdown |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | β |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Mac β better | iPhone, iPad |
| Requires iOS | 15.0 β better | 17.0 |
| Further details β not scored | ||
| Size | 129 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Lee | Alfred Ang |
In-app purchases
RADii Viewer
No in-app purchases
Tertiary Markdown
No in-app purchases





