BDUI Go vs Vays
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
BDUI Go
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BDUI Go is a runner for server-driven UI: it opens apps described by JSON schemas and renders them natively ā the way a browser opens websites, only for mobile screens. A schema is data, not code: it declares which components to show and which HTTP requests to make. BDUI Go renders that data with native Compose Multiplatform components ā no webview, no downloaded executables. Scan a QR code or open a link, and the app it points to loads instantly. When its author publishes an update, you see the new screens in seconds ā no reinstall, no waiting for a new version. TRY IT RIGHT AWAY ā NO ACCOUNT NEEDED ⢠Component showcase: every BDUI building block, rendered live from JSON ⢠Currency exchange demo: live rates from the Frankfurter API with pull-to-refresh ⢠Weather demo: city search and forecasts via the Open-Meteo API ⢠Auth demo: automatic token injection with transparent refresh and retry HOW IT WORKS 1. An author describes an app in a JSON schema and publishes it 2. They share a link or a QR code 3. You open it in BDUI Go ā the screens render natively on your iPhone Every publish reaches users in seconds. Authors can switch between dev, staging and production channels and roll back to any version in one click. FEATURES ⢠Native rendering (Compose Multiplatform) ā no webview ⢠Offline cache: previously opened apps launch even without a network ⢠Recents list, with any app pinned as the default one that opens on start ⢠Host allow-list: a schema declares the hosts it may call, and requests to anything else are blocked ⢠Declarative token auth for API-backed apps ⢠Universal Links: https://bdui.io/a/⦠opens directly in BDUI Go PRIVATE BY DESIGN No accounts, no ads, no analytics, no tracking. The camera is used only to scan QR codes, entirely on your device. Privacy policy: https://bdui.io/privacy FOR DEVELOPERS Ship an app without a release train: describe it in JSON, publish, share a link. Learn more at https://bdui.io
Vays
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Your AI writes Markdown all day. Now you can read it anywhere. VAYS MD is a native iPhone and iPad reader and editor for .md files ā READMEs, specs, meeting notes, transcripts. Open a file and read it like a document, with real typography, not source code. No cloud in the middle. Nothing leaves your device. READ ⢠GitHub Flavored Markdown: tables, task lists, strikethrough ⢠Callout cards ā GitHub [!NOTE] / [!TIP] / [!WARNING] and Obsidian styles ⢠Display math typeset natively ā no web view ⢠shields.io badges drawn natively, front-matter shown as a tidy card ⢠Footnotes become superscripts with gathered definitions ⢠Mermaid blocks appear as clean code cards (full diagram rendering is on the roadmap) ⢠Dark mode tuned for night reading WRITE ⢠Source editor with Markdown highlighting ⢠Autosave straight back to the file ā no export dance ⢠Works with the Files app: iCloud Drive, On My iPhone, and any provider PRIVATE BY DEFAULT No account. No analytics. No network requests. Your documents stay in your storage, exactly where they were. BETTER TOGETHER WITH THE MAC APP VAYS MD Reader for Mac adds a folder library, Mermaid diagrams rendered offline, a visual diagram creator, QuickLook, PDF export and Claude Code integration. Same design, same privacy. PART OF THE VAYS FAMILY From the maker of Vays, the private voice-note app. Record on the go, read the transcript beautifully. Built by a solo developer. Every feedback email is read.
Screenshots
Verdict
The clearest difference is iOS requirement: BDUI Go at 15.0 against Vays's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BDUI Go ships an update every 3 weeks, Vays fortnightly. The most recent releases landed on September 30, 2026 and September 26, 2026 respectively.
| Parameter | BDUI Go | Vays |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Fortnightly ā better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 ā better | 17.0 |
| Further details ā not scored | ||
| Size | 61 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Yuriy Zhelannov | ARVIND JUNEJA OUMM |
In-app purchases
BDUI Go
No in-app purchases
Vays
No in-app purchases









