Host Studio: 3270 & 5250

Mainframe & AS/400 Terminal

$39.99 · Designed for iPad

Enterprise TN3270E & TN5250E terminal with Face ID security, MDM fleet deployment, SCS host printing, IND$FILE, & iCloud sync for Mac, iPhone, iPad, and Apple Vision Pro. Host Studio is a high-performance, native 3270 and 5250 terminal emulator engineered for macOS, iOS, iPadOS, and Apple Vision Pro. Connect securely to IBM mainframes (z/OS, z/VM, z/VSE) and IBM i midrange systems (AS/400) with authentic CRT rendering, stream-to-native GUI transformation, IND$FILE dataset transfer, virtual SCS host printing, and enterprise MDM fleet management. AUTHENTIC TN3270E & TN5250E EMULATION • TN3270 & TN3270E Engine: Full RFC 2355 negotiation, LU pooling, and Screen Models 2, 3, 4, and 5 (27×132). • TN5250 & TN5250E Engine: Connect to IBM i (AS/400) via RFC 1205 & RFC 4777 with 24×80 and 27×132 displays, Workstation ID allocation, automated bypass sign-on, associated printer binding, System Request, and menus. • EBCDIC Code Pages: Native mapping for CP037, CP273, CP280, CP284, CP285, CP297, CP500, CP870, CP871, CP930, CP1047, and more. • CRT Theme Gallery: Green Phosphor, Amber Classic, Crisp Paper White, Cyberpunk, and High Contrast presets with scanlines, OIA status line, and 3279 colors. STREAM-TO-NATIVE UI CONVERSION • Instant GUI Mode: Switch between CRT terminal view and modern SwiftUI forms with a single tap. • Subsystem-Aware Parsing: Automated detection for IBM CICS, z/OS TSO/ISPF, IBM IMS, and z/VSE. • AS/400 Subfile Grids: Parses IBM i subfiles (WRKACTJOB, WRKSPLF) into interactive tables with option inputs and status indicators. • Clean Labeled Forms: Strips filler dots and prompt leaders into clean inputs and structured key-value cards. • Interactive Command Bar: Extends primary command and option prompts (Option ===>, TRANID) into an ergonomic command bar. • Contextual Action Buttons: Automatically extracts screen PF/PA legends into native action buttons. BIOMETRIC SECURITY & KEYCHAIN PROTECTION • Face ID & Touch ID Session Locking: Protect sensitive host bookmarks behind biometric authentication before connecting. • iCloud Keychain Credential Sync: Sync host credentials securely across your Apple devices via the encrypted Apple Keychain. • Sanitized Bookmark Sharing: Safely export and share host bookmarks via AirDrop or JSON with credentials automatically stripped. ENTERPRISE MDM & FLEET MANAGEMENT • Managed App Configuration: Deploy pre-configured corporate bookmarks, enforce TLS encryption, and lock settings via Apple Business Manager and MDM (Jamf, Microsoft Intune, Workspace ONE). • Data Loss Prevention (DLP): Restrict host dataset downloads and local file exports via centralized MDM policy. 5250 VIRTUAL SCS PRINTER & SPOOL WORKBENCH • Real-Time Spool Capture: Emulate a 5250 companion printer (RFC 2877 / RFC 4777) to capture IBM i print jobs in real time. • Vector PDF Generation: Converts SNA Character String spool data into crisp vector PDFs. • Spool Job Management: Inspect, export, share, or print host reports wirelessly via AirPrint or macOS CUPS. IND$FILE MAINFRAME DATASET TRANSFER • Multi-System Support: High-speed transfers with TSO/E, VM/CMS, and CICS subsystems. • Structured Field & CUT Modes: Full support for Outbound/Inbound Structured Fields and CUT transfers. • Flexible Formats: Handles Fixed (F), Variable (V), and Undefined (U) records with configurable LRECL, BLKSIZE, and ASCII/EBCDIC/Binary modes. APPLE ECOSYSTEM INTEGRATION • Spotlight Search: Search host bookmarks in system Spotlight for instant launch. • Siri Voice Shortcuts: Ask Siri to connect to saved host sessions hands-free. • Tabletop & DuoPosture Console: Ergonomic split layout with tactile keypad and navigation D-pad. • Barcode & Camera Scanner: Scan physical barcodes and QR codes directly into host input fields. • Session Safeguards: Prevents accidental disconnects on quit (⌘Q) or window close during active sessions. ZERO-NETWORK OFFLINE DEMOS Test drive IBM 3270 and IBM i (AS/400) TN5250E emulation, Native UI conversion, themes, printer spools, and navigation immediately upon launch with built-in dual offline demo sessions.

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What's New in Version 2611.1.38: • Platform-Specific Hardware Capabilities: Scoped camera-based barcode and QR scanning exclusively to iOS and iPadOS devices, streamlining the macOS and visionOS terminal interfaces and inspector toolbars. • Complete 3270 & 5250 SNA Subsystem Parity: Full RFC 2355 TN3270E SNA support (SSCP-LU-DATA 4A unformatted VTAM logon sessions, LU-LU 4B BIND-IMAGE & UNBIND lifecycle, RESPONSES positive/negative acknowledgments, and ERR-COND-CLEARED recovery) and RFC 1205 / RFC 4777 IBM i 5250 SNA General Data Stream (GDS) support (5B startup response record parsing, Cancel Invite, and negative SNA sense codes). • Dedicated SysReq & Attn Controls Across All Keypads: Direct, clearly labeled System Request (SysReq) and Attention (Attn) keys across macOS, iOS, iPadOS, and visionOS keypads for both 3270 (IAC AO subsession toggling & IAC IP out-of-band interrupt) and 5250 (GDS SRQ 0x0400 & ATN 0x4000 flags). • Authentic OIA SNA Subsession & Sense Indicators: Live Operator Information Area (OIA) badges displaying 4A (SSCP-LU), 4B PLU , 5B System (IBM i 5250 GDS session), and X SNS hex sense diagnostics with Stream Trace decoding.

Version 2611.1.38

The developer, Sean Batson, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Larger Text

      • Dark Interface

      • Differentiate Without Color Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    Seller
    Sean Batson
    Size
    12 MB
    Category
    Business
    Compatibility
    Requires iOS 26.6 or later.
    • iPhone
      Requires iOS 26.6 or later.
    • iPad
      Requires iPadOS 26.6 or later.
    • Mac
      Requires macOS 26.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.6 or later.
    Languages
    English and 9 more
    • English, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
    Age Rating
    4+
    Copyright
    © 2026 Sean Batson. All rights reserved.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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