Comparison

Chat API vs OMessage

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

Head to head
About

Chat API

Access powerful AI models locally or through cloud APIs. This tool offers flexible integration with GPT-4, OpenAI, Grok, and local LLMs for diverse tasks like coding, drafting, and research.

Highlights
  • Private local LLM support with Ollama
  • OpenAI and Grok API integration
  • Built-in text-only GPT-4 model
  • Bing-powered real-time searches
  • Image generation capabilities
  • Seamless model switching
Features
Read full description

Run private local LLM AI models with Ollama, or unleash AI through OpenAI & Grok APIs for advanced features and flexibility. ChatAPI offers a built-in text-only GPT-4 model for instant AI access, plus support for OpenAI API, Grok API, local LLM Ollama models, and Bing-powered real-time searches. - Flexible AI Access: Use the onboard GPT-4, connect Ollama for running private AI locally on your own PC or server, or integrate OpenAI/Grok/Bing APIs for advanced features like image generation. - Versatile & Powerful: Seamlessly switch between models for drafting, coding, brainstorming, or research with fast, reliable responses. Subscription Options: - Monthly: Unlimited GPT-4, OpenAI/Grok/Bing API integration, and Ollama support. - Yearly: Same as monthly, with cost savings. Download ChatAPI for flexible, private, and powerful AI interactions! Privacy Policy: https://sites.google.com/view/gpt-lite/privacy Terms of Use: https://sites.google.com/view/gpt-lite/terms Support: https://sites.google.com/view/gpt-lite/support

About

OMessage

Features
Read full description

OMessage is a simple and easy-to-use chat app designed for iOS, allowing you to interact with the your local AI service. With an iMessage-style interface, it provides a familiar and seamless chatting experience. Whether you need information, writing assistance, or just a casual chat, OMessage is here to help. Features: - Multimodal Model Support: Interact with different types of models, supporting text, image, and other input/output formats. - Reasoning Model Support: Engage in complex reasoning and analysis for intelligent conversations. - Message History Management: Easily view and manage your chat history to revisit past conversations. - Model Switching: Quickly switch between different models to meet your specific needs. Note: This app requires a self-hosted Ollama service to function. The icons and model names in the app are solely used to help users differentiate between different AI models and are not part of any commercial promotion.

Screenshots

Chat API4 screens
OMessage3 screens

Verdict

The call

The clearest difference is in-app purchases: OMessage at none against Chat API's 3. OMessage also leads on ads (none vs shown). Chat API's advantage is iOS requirement (14.0 vs 16.0). On price, update cadence 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. Chat API sells 3 in-app purchases, starting at $1.99 per month. OMessage asks for nothing beyond the download.

UpkeepUpdate frequency

Chat API ships an update weekly, OMessage every 5 days. The most recent releases landed on October 21, 2026 and October 18, 2026 respectively.

Scorecard3 real differences · 7 level
Chat API versus OMessage: the parameters behind the verdict, then further details
ParameterChat APIOMessage
PriceFreeFree
Rating4.2 (5 ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings5 — better—
Update frequencyWeeklyEvery 5 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better16.0
Further details — not scored
Size78 MB12 MB
Age rating17+4+
DeveloperAndres Nunez Soto寰宇 骆

In-app purchases

3 purchases

Chat API

Subscriptions3
  • Unlimited Access (Monthly)7 Days trial$1.991 Month
  • Unlimited Access (Yearly)$19.991 Year
  • Pro Supporter Yearly$49.991 Year
None

OMessage

No in-app purchases

Questions

Is Chat API free?
Chat API is free to download, with in-app purchases available.
Is OMessage free?
OMessage is free to download, with no in-app purchases.
Do Chat API or OMessage have ads?
Chat API shows ads; OMessage does not.
Which is updated more often, Chat API or OMessage?
Chat API ships an update weekly, and OMessage every 5 days. Most recently, Chat API was updated on October 21, 2026 and OMessage on October 18, 2026.

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