Comparison

Open Chat Inference vs Yemma 4

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

Head to head
About

Open Chat Inference

Features
Read full description

Open Chat is a native AI chat client that connects to the AI providers you already use. Bring your own API keys from Anthropic, OpenAI, and chat from a single, fast interface. Features: - Connect multiple AI providers in one app - Persistent conversation history - API keys stored securely in your device's keychain - Clean, distraction-free chat interface - Dark and light themes Open Chat is a client application. You'll need your own API keys from supported AI providers to use it. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Yemma 4

This AI chat app runs entirely on your iPhone, processing prompts, images, and responses locally. Enjoy private conversations, brainstorm ideas, and summarize notes offline after an initial model download. It requires specific hardware for full functionality.

Highlights
  • 100% on-device AI chat
  • No sign-up or subscription required
  • Offline functionality after model download
  • Local conversation history
  • Adjustable response style
  • Image understanding
Features
Read full description

Yemma 4 is a private AI chat app that runs entirely on your iPhone. It runs Google's Gemma 4 locally through a Swift-native MLX multimodal runtime, so your prompts, images, and responses stay on your device. There is no account to create, no cloud inference service in the middle of your conversations, and no telemetry pipeline watching what you do. Download the model once, then keep chatting on Wi-Fi, cellular, or in airplane mode. Ask questions, brainstorm ideas, rewrite text, summarize notes, describe photos, and have real back-and-forth conversations with image attachments, all processed on-device. Why Yemma 4 feels different: - 100% on-device AI chat - No sign-up, login, or subscription - Offline after the initial model download - Local conversation history you can delete any time - Adjustable response style and creativity controls - Image understanding through the same on-device model Hardware note: - Requires iPhone hardware with the A17 Pro chip or later - First model download is about 4.2 GB, so Wi-Fi and free storage are recommended

Screenshots

Open Chat Inference3 screens
Yemma 44 screens

Verdict

The call

The clearest difference is iOS requirement: Open Chat Inference at 14.0 against Yemma 4's 17.0. On price, ads, in-app purchases and device support 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.

Scorecard1 real difference · 8 level
Open Chat Inference versus Yemma 4: the parameters behind the verdict, then further details
ParameterOpen Chat InferenceYemma 4
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequency—Daily
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPod — betteriPhone
Requires iOS14.0 — better17.0
Further details — not scored
Size14 MB28 MB
Age rating17+4+
DeveloperWeiss Solutions LLCAVMIL LABS LLC

In-app purchases

None

Open Chat Inference

No in-app purchases

None

Yemma 4

No in-app purchases

Questions

Is Open Chat Inference free?
Open Chat Inference is free to download, with no in-app purchases.
Is Yemma 4 free?
Yemma 4 is free to download, with no in-app purchases.
Do Open Chat Inference or Yemma 4 have ads?
Neither Open Chat Inference nor Yemma 4 shows ads.

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