Best All-in-One AI Apps of 2026
All-in-one AI apps bundle models from OpenAI, Anthropic, Google and others behind one subscription, so you don’t have to pay for ChatGPT Plus, Claude Pro and Gemini separately. We compared five popular apps on the models they include, free plans, prices and extras such as browser extensions and AI agents.
Merlin AI
The best all-rounder: Merlin AI puts models from OpenAI, Anthropic, Google and xAI into one subscription and works both as a Chrome extension on any web page and as a web app with chat, projects and deep research. The free tier comes with a daily query limit, so you can test it before paying; Pro costs $29/month or $19/month billed yearly, and Teams start at $15 per seat (annual).
Try Merlin AI →The full ranking
Sider
Monica
Poe
Writingmate AI
📊 All-in-one AI apps compared
| App | Best for | Models | Free plan | Paid from |
|---|---|---|---|---|
| Merlin AI | All-rounder in the browser and on the web | OpenAI, Anthropic, Google, xAI | Yes · daily query limit | $19/mo (yearly) |
| Sider | Browser sidebar with an AI agent | GPT, Claude, Gemini, Grok & more | No free plan listed | $8.33/mo (yearly) |
| Monica | Unlimited advanced models for little money | GPT-6.1 Sol, Claude Sonnet 5.5, Gemini 3.8 Flash | Yes · 40 queries/day (basic models) | $8.30/mo (yearly) |
| Poe | The widest choice of models and bots | Anthropic, OpenAI, Google & many more | Yes · daily points | $4.17/mo (yearly) |
| Writingmate AI | Comparing answers side by side | 350+ models incl. Claude, GPT, Gemini | 3-day trial | $19.99/mo (yearly) |
Prices as listed on the providers’ pricing pages, checked November 2026; most are in US dollars. Which models a plan includes and how much you can use them changes often — check the provider’s page before you buy.
How to choose
- Best all-rounder with a free tier: Merlin AI — Chrome extension plus web app.
- Working in the browser, with an AI agent: Sider — Sider Hand fills forms and researches across websites.
- Most usage for the money: Monica Max — unlimited advanced models for $16.60/month (billed yearly).
- Trying as many models as possible: Poe — points instead of message limits.
- Comparing answers from several models: Writingmate.
- Only need one assistant? A single plan such as Claude Pro or ChatGPT Plus ($20/month) gets you the newest flagship models directly — see our best AI chatbots.
⚖️ All-in-one app or the original?
All-in-one apps are usually cheaper than paying for ChatGPT Plus, Claude Pro and Gemini separately, but they are not the same as the original apps. They typically reach the models through the providers’ APIs, so app features such as ChatGPT’s voice mode or Claude’s projects are not included, and the most expensive models — for example Claude Fable 5.2 — often cost extra credits or have tighter limits.
If you mostly use one assistant, its own subscription is usually the better deal. If you switch between models or want them inside your browser, an all-in-one app saves money.
❓ Frequently Asked Questions
What is the best all-in-one AI app?
Merlin AI is the best all-rounder: it bundles models from OpenAI, Anthropic, Google and xAI, works as a Chrome extension and web app, and has a free tier with daily queries. Sider is the stronger pick if you want an AI agent that works on websites, Monica offers unlimited advanced models for $16.60/month (billed yearly), and Poe has the widest choice of models.
Is there a free app with ChatGPT, Claude and Gemini?
Yes, with limits. Merlin AI has a free tier with a daily query limit, Monica’s free plan allows 40 queries a day on basic models such as Claude Haiku 5.5, Gemini 3.5 Flash-Lite and GPT-6 Luna, and Poe is free to start with daily points. The strongest models usually need a paid plan.
Are all-in-one AI apps cheaper than ChatGPT Plus and Claude Pro?
Usually, if you want several models. ChatGPT Plus and Claude Pro each cost $20/month; Monica Pro starts at $8.30/month, Sider at $8.33 and Merlin Pro at $19 (all billed yearly), with models from several providers. The catch: usage limits and credits differ by plan, and the newest flagship models may be limited.
Which all-in-one AI app has the most models?
Writingmate lists more than 350 models, and Poe offers models from Anthropic, OpenAI, Google and many other providers plus community bots. Merlin AI, Sider and Monica focus on the leading models from the big labs.
Is it safe to use all-in-one AI apps?
They pass your prompts on to the model providers, so treat them like any other cloud service: don’t paste confidential data unless the app’s privacy terms — and for companies, a data processing agreement — cover it.
🔗 Related
How we rank: We compared which models each app includes, free-plan limits, prices and extras, using the providers’ own pages — not commission rates. Some links are affiliate links (marked as sponsored): AIVerso may earn a commission if you sign up, at no extra cost to you. Prices can change; check the provider’s site before buying. Last updated: November 11, 2026.