The CustomGPT alternative for GDPR-conscious teams
CustomGPT.ai is a mature RAG platform with a strong document pipeline (1,400+ file formats) and clean source citations. Entry costs $99/month though — with only 1,000 queries — and hosting is in the US.
Zeptix delivers the same core discipline — bots that answer exclusively from your knowledge, with citations — from €29/month with 5,000 credits, EU hosting, a DPA and a monetization system that handles billing for you: on CustomGPT you build that yourself.
What CustomGPT.ai
CustomGPT.ai (USA) offers two public plans: Standard $99/mo ($89 annual; 10 agents, 1,000 queries/month, 60M words storage) and Premium $499/mo ($449 annual; 25 agents, 5,000 queries, 300M words, white-label) plus custom Enterprise. 7-day trial.
CustomGPT vs. Zeptix head-to-head
CustomGPT.ai prices: public pricing page customgpt.ai/pricing, as of 2026-06-09. All other statements about the competitor's features and availability are likewise based on publicly available information as of that date. All information without guarantee — the provider pages are authoritative.
When CustomGPT may be the better choice
- You must ingest very exotic formats (1,400+ file types, ZIP/RAR, OCR, podcast transcription).
- You need very large knowledge bases (up to 300M words per agent on Premium).
- Multi-agent setups with 10+ separate projects from day one.
When Zeptix is the better choice
- Entry price-performance: €29 for 5,000 credits vs. $99 for 1,000 queries.
- GDPR without discussion: EU hosting, DPA, public subprocessor list.
- Monetization built in: paywall, end-user credits, revenue share — on CustomGPT you build the billing yourself (research as of 2026-06-09).
- White-label from Business (€249) instead of the $449 Premium plan.
- Builder assistant included: zep helps you build persona, knowledge and bot settings right in the dashboard chat.
Frequently asked questions about CustomGPT alternatives
Does Zeptix answer only from my content, like CustomGPT?
Yes. Zeptix bots are RAG-based and answer from your knowledge base with source citations. The persona controls tone and behavior. A web-search boost for live research is planned as an add-on (coming soon) and can't be booked yet.
How many answers do I get on Zeptix for €29?
The Starter plan includes 5,000 credits per month. A standard answer costs a few credits; premium models like Claude or GPT-5-class cost more — credit costs per model are transparently shown in the dashboard. For comparison: CustomGPT Standard includes 1,000 queries for $99.
Can I switch from CustomGPT to Zeptix?
Yes — export your sources (documents, sitemaps, URLs) and upload them to Zeptix. The builder walks you through persona, branding and publishing in minutes. The 14-day trial lets you test both systems side by side.
See for yourself — in 5 minutes
Upload knowledge, set the persona, test live. 14 days free, no credit card.