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Privacy-first AI workspace with 6 providers (GPT-4, Claude, Gemini, Grok, Mistral, Perplexity) and 20+ models. Your sensitive data is filtered in your browser before any query leaves. Real-time cost tracking. Editable artifacts. One subscription.

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Website, pricing, platforms and company facts side by side.
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| Website | callgpt.co.uk | opalstack.com |
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| Company | Startup from the United Kingdom · 1 - 9 employees · 2026 | — |
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In their own words, as submitted to SaaSHub.


CallGPT 6X provides unified access to six AI providers (OpenAI, Anthropic, Google, xAI, Mistral, Perplexity) and 20+ models in one workspace. Its standout feature is client-side privacy filtering — sensitive data like National Insurance numbers, card details, and confidential information is...
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What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
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Overall verdict
Why this product is good
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing CallGPT 6X and Opalstack.
CallGPT 6X's answer
CallGPT 6X's answer
Client-side privacy filtering. Your sensitive data is processed in your browser before any query reaches AI providers. No other AI workspace does this.
CallGPT 6X's answer
One subscription replaces four. Access GPT-4, Claude, Gemini, Grok, Mistral, and Perplexity in one workspace. See exact costs before sending. Switch models mid-conversation without losing context. Your data stays local.
CallGPT 6X's answer
Professionals handling sensitive data — consultants, lawyers, founders, developers, researchers — who need powerful AI without privacy trade-offs.
CallGPT 6X's answer
I quit my job in 2021 to build AI tools that don't sell out their users. Four years and three countries later, CallGPT 6X launched. I built 67,000 lines of code in 7 days, live on YouTube.
CallGPT 6X's answer
Next.js, React, Node.js, MongoDB, Vercel, Stripe, Claude Opus 4.5, OpenAI GPT-4, Google Gemini, Microsoft Azure.
Share your experience with using CallGPT 6X and Opalstack. For example, how are they different and which one is better?
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ChatGPT is a powerful, open-source language model.
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Claude is a next generation AI assistant built for work and trained to be safe, accurate, and secure. An AI assistant from Anthropic.
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