# OpenAssistant — Assistants + Vectors + Files!

> AI assistant creation and file interaction tool with vector store integration. (iPhone/iPad app by Gunnar Hostetler.)

- Source: https://appshunter.io/ios/app/openassistant/id6692613772 (this page in markdown: same URL + `.md`)
- Developer: [Gunnar Hostetler](https://appshunter.io/developer/1768599987)
- Category: Developer Tools, Utilities
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 17+
- Requires: iOS 16.0 · 5 MB
- Languages: American English
- Released: 2025-05-09
- Data updated: 2026-09-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/openassistant/id6692613772/reviews.md

## What is OpenAssistant?

If you’re seeking quick answers about any file(s) you stumble across, OpenAssistant is here to (help) blow your mind.  This app is designed to call the Assistants=v2 API.

Core Features:
- Create & Customize Assistants:
    - Personalize names and descriptions
    - Set custom instructions
    - Adjust parameters
    - Choose ChatGPT model (Updated with 4.1 + o1 + o3-mini)
- Full Management Control:
    - Create, update, and delete assistants
    - Manage multiple assistants for different content
- Vector Store Integration:
    - Create and manage vector stores
    - Upload and organize multiple file types
    - Efficient semantic search capabilities
Interactive:
- Natural Conversations
    - Chat naturally about your documents
- Seamless Integration
    - Upload multiple files simultaneously
    - Chat with your files within minutes.

## Key features

- Create and customize AI assistants
- Manage multiple assistants
- Integrate with vector stores
- Upload and search multiple file types
- Natural language conversations with documents
- Choose ChatGPT models


## Frequently asked questions about OpenAssistant

### What is OpenAssistant?

OpenAssistant is a developer tool that allows you to create and manage custom AI assistants. It enables natural conversations with your documents and integrates with vector stores for efficient file searching.

### Can I customize the AI assistants in OpenAssistant?

Yes, you can personalize AI assistants by setting custom names, descriptions, instructions, and adjusting parameters. You can also choose from various ChatGPT models, including updated versions like 4.1.

### How does OpenAssistant handle files?

OpenAssistant allows you to create and manage vector stores, upload multiple file types simultaneously, and perform efficient semantic searches. You can chat naturally about the content of your uploaded documents.

### What devices does OpenAssistant support?

OpenAssistant is currently supported on iPhone devices.

### Is OpenAssistant free to use?

Yes, OpenAssistant is available for free. It does not have in-app purchases or advertisements.

### How often is OpenAssistant updated?

The latest version of OpenAssistant is 3.2, and it was last updated on June 24, 2025. This indicates a recent and active development cycle.

### What is the age rating for OpenAssistant?

OpenAssistant has an age rating of 17+, which is typical for developer tools that may involve complex functionalities or technical concepts.

### What are the benefits of using vector stores with OpenAssistant?

Vector stores enable efficient semantic search, allowing OpenAssistant to understand and retrieve information from your documents based on meaning rather than just keywords. This facilitates more accurate and relevant answers.

## Version history (last 5 releases)

### 3.2 — 2025-06-24

Fixed LOTS of bugs
• Should flow much easier now.
Universal File Converter
• HEIC → JPEG, RTF → TXT, plus pluggable strategy pattern for future types—just upload & go.
True Tab Multitasking
• Brand-new Tab enum drives the entire nav stack—jump between chats & vector stores instantly.
Instant Vector-Store Actions
• Optimistic deletes & uploads with real-time file counts; rollback safety net if the API balks.
Turbo-Loading & Empty States
• Dynamic progress messages, glassmorphism spinner, and a guided “no assistants yet?” screen.
Auto-Refresh Everywhere
• Observer & NotificationCenter overhaul keeps chats, assistants, and vector stores in sync—no pull-to-refresh required.
Background-Safe Fetch Queue
• New serial queue prevents race conditions when hammering the OpenAI API.
Codebase TLC
• Cleaner project file, tighter Combine pipelines, smaller debounce windows, and 800 net LOC of fresh Swift.
Reasoning-Effort Picker Fix
• Removed redundant “Default (medium)” option—caption now clarifies Medium is default.
Massive README Overhaul (devs: see GitHub)
— 15 commits • +1 200 / −460 LOC • 4 Features • 5 Improvements • 1 Fix

### 3.0 — 2025-05-08

Change log (Dec 4, 2024 → May 7, 2025)

Assistants
* Add create, update, and delete workflows via new screens and service calls
* Introduce per-assistant tool toggles (Code Interpreter, Retrieval)
* Reinstate explicit model parameter handling in update logic

Vector stores & file uploads
* Implement vector-store creation and file-upload views
* Add upload progress indicator and manual refresh action
* Provide user-configurable chunk size for uploads

Networking & reliability
* Add automatic retry logic for API requests
* Debounce vector-store refresh calls to respect rate limits

Chat & message flow
* Persist chat threads and reuse existing threadId on reopen
* Remove ResponseView / ResponseViewModel; replies render directly in chat list
* Standardise assistantId usage across chat and history views
* Migrate messaging to MessageStore with detailed logging

UI / appearance
* Centralise colour palette and icon handling (Appearance.swift, AssistantIconManager)
* Update layouts and SwiftUI previews across all views

Settings & security
* Store OpenAI API key in Keychain and add editable Settings screen

Error handling
* Expand service-layer error cases and surface them in UI

### 2.3 — 2024-12-03

- File Upload Tracking: Effortlessly monitor upload progress with real-time status updates.
- Improved UI Feedback: Enhanced visual cues and loading indicators across the app for a more intuitive and responsive interface.
- QoL: Optimized loading state management for faster performance and streamlined navigation.
- Error Handling Upgrades: Improving API service methods in error handling and response parsing, offering greater reliability and clarity.
- Documentation Overhaul: A brand-new README file with a professional structure to guide users and (eventually) developers effectively.

### 2.2 — 2024-11-28

Tons of bug fixes and improvements.
App description has been fully updated.

### 2.1 — 2024-10-18

Fixed ChatView messages when continuing threads

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## More apps by Gunnar Hostetler

- [OpenCone](https://appshunter.io/ios/app/opencone/id6744467668)
- [OpenIntelligence](https://appshunter.io/ios/app/openintelligence/id6756559175)
- [OpenResponses](https://appshunter.io/ios/app/openresponses/id6757338355)
- [OpenManual](https://appshunter.io/ios/app/openmanual/id6804523993)

All apps by Gunnar Hostetler: https://appshunter.io/developer/1768599987

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*