Comparison

MLC Chat vs Vector Space AI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MLC Chat

Engage in conversations with open language models directly on your iPad or iPhone. Once a model is downloaded, all interactions occur locally, ensuring privacy and offline functionality without internet access. This app is designed for non-commercial use, allowing you to run various open-source language models on your device.

Highlights
  • Local AI model chat
  • Offline functionality
  • No internet required
  • Privacy-focused
  • Open-source project integration
  • Downloadable language models
Features
Read full description

MLC Chat lets users chat with open language models locally on ipads and iphones. After a model is downloaded to the app, everything runs locally without server support, and it works without internet connections do not record any information. Because the models run locally, it only works for the devices with sufficient VRAM depending on the models being used. MLC Chat is part of open source project MLC LLM, with allows any language model to be deployed natively on a diverse set of hardware backends and native applications. MLC Chat is a runtime that runs different open model architectures on your phone. The app is intended for non-commercial purposes. It allows you to run open-language models downloaded from the internet. Each model can be subject to its respective licenses.

About

Vector Space AI

This app offers a fast, private AI companion that runs locally on your device, providing instant responses for writing, brainstorming, and coding. It also allows seamless switching to cloud-based AI for more advanced queries.

Highlights
  • Runs locally on device
  • Optional ChatGPT API connection
  • Modern and clean interface
  • Instant response times
  • Complete user data privacy
  • Seamless mode switching
Features
Read full description

Chat with FREE, FAST and POWERFUL AI that runs LOCALLY on your iPhone Meet your new AI companion that’s always available — no cloud, no lag, just pure speed. Our advanced local AI engine runs directly on your iPhone, giving you instant responses, full privacy, and offline intelligence. Whether you’re writing, brainstorming, translating, or coding — everything happens right on your device. And when you want to connect to the cloud, simply switch to ChatGPT API mode for even more powerful, up-to-date answers. Key Features: - Runs Locally — Experience lightning-fast chat without internet or server delay. - Optionally, Connect to by ChatGPT API — Access the world’s smartest AI whenever you want. - Beautiful Modern Design — A clean, elegant interface built for clarity and focus. - Instant Responses — No waiting. No spinning wheels. Just smooth conversation. - Completely Private — Your data stays on your device. Nothing leaves your phone. - Seamless Mode Switching — Toggle between local AI and ChatGPT in one tap. Why You’ll Love It: Because it’s your AI — fast, powerful, private, and beautifully crafted. Talk, create, think, and explore ideas anywhere — even offline. Download now and experience the future of AI — FAST. PRIVATE. BEAUTIFUL. LOCAL.

Screenshots

MLC Chat2 screens
Vector Space AI3 screens

Verdict

The call

The clearest difference is review sentiment: Vector Space AI at 100% against MLC Chat's 68%. Vector Space AI also leads on update cadence (every 4 days vs every 2 months). On price, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

MLC Chat ships an update every 2 months, Vector Space AI every 4 days. The most recent releases landed on August 19, 2026 and September 7, 2026 respectively.

Scorecard2 real differences · 8 level
MLC Chat versus Vector Space AI: the parameters behind the verdict, then further details
ParameterMLC ChatVector Space AI
PriceFreeFree
Rating4.2 (78 ratings) — better—
Positive reviews68.3% of reviews100.0% of reviews — better
Number of ratings78 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.0
Further details — not scored
Size1.7 GB34 MB
Age rating17+4+
DeveloperTianqi ChenVoila Tech K.K

Customer experience

MLC Chat

All ratings78 ratings
Positive83.3%
Neutral3.8%
Negative12.8%
Written reviews63 reviews
Positive68.3%
Neutral12.7%
Negative19.0%

Vector Space AI

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

MLC Chat

Reported bugs

17 issues
  • Phi model crashes on iOS 26.0.1 17 Pro Max
  • App crashes on iPad Pro 4th Gen, iPadOs 17.7
  • RedPajama model crashes app on initialization
  • Update is extremely slow
  • Download model button disabled in new version
Show 12 more
  • RedPajama model crashes, custom model download removed
  • App closes when hitting send on iPhone 13
  • Conversation resets when app is backgrounded
  • Vicuna and Mistral 7B models cause crashes
  • Some 7b q4f16/q4f32 models crash on iPhone 15 Pro
  • App crashes on iPhone 13 mini
  • Cannot load other models from URL
  • Crash on iPhone 12
  • Severe heating and frequency reduction on A15
  • Low VRAM failed initialization on 3GB LP DDR4X phone
  • Cannot run 4bit model on iPhone 15 with 8GB RAM
  • Loading models from HF MLC official Repo causes crashes

Requested features

14 requests
  • Ability to import custom models (from URL/Hugging Face)
  • Support for more specific models (DeepSeek, Phi-2, Gemma 2B/7B, MoE Mixtral 8x7B, LLaVA)
  • History of conversations
  • iOS shortcuts support
  • Ability to export entire responses
Show 9 more
  • Information on VRAM requirements per phone/model
  • Ability to change system message/create custom profiles
  • Ability to edit responses and system prompt
  • Add coffee support
  • Delete downloaded models
  • Change settings per model (repetition penalties, temperature)
  • How-to guide for importing/recompiling LLMs
  • Estimate model compatibility before download
  • Support for CN and ZH languages

Vector Space AI

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

MLC Chat

No in-app purchases

None

Vector Space AI

No in-app purchases

Questions

Is MLC Chat free?
MLC Chat is free to download, with no in-app purchases.
Is Vector Space AI free?
Vector Space AI is free to download, with no in-app purchases.
Do MLC Chat or Vector Space AI have ads?
Neither MLC Chat nor Vector Space AI shows ads.
Which is updated more often, MLC Chat or Vector Space AI?
MLC Chat ships an update every 2 months, and Vector Space AI every 4 days. Most recently, MLC Chat was updated on August 19, 2026 and Vector Space AI on September 7, 2026.

Other comparisons