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CustomGPT.ai vs Epsilla

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan
Epsilla — $29/mo vs $99/mo for CustomGPT.ai
Free plan
Only Epsilla (CustomGPT.ai has paid plans only)
Public API
Both have one
Best fit
CustomGPT.ai: Support teams turning an existing help centre into a self-serve answer bot · Epsilla: Teams building internal or customer-facing agents on private documents without an ML team
Trust score
About even — CustomGPT.ai 90, Epsilla 89

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

CustomGPT.aiBuilds retrieval chatbots from company documents, sites and helpdesk contentEpsillaNo-code agent-as-a-service platform that builds RAG-backed AI agents on your own documents, in the cloud or on-premise.

Side by side

FactCustomGPT.aiEpsilla
CategoryCustom GPTs & Bot BuildersAI Agents & Autonomous Workers
Pricing modelPaidFreemium
Starts at$99/mo$29/mo
Public APIYesYes
Trust score90 / 10089 / 100
PlatformsWeb, APIWeb, API
CompanyCustomGPT Inc.Epsilla, Inc.
Launched20232023
Last verifiedSep 6, 2026Oct 2, 2026

What our research says

CustomGPT.ai

A packaged retrieval stack for teams that want a grounded chatbot without assembling their own; the connector breadth and compliance paperwork are what the price buys. At $99/month against a four-figure query cap, the cost per answer is high until volume justifies it.

Pros

  • Answers are constrained to ingested content, which materially cuts invented answers versus open chat
  • 100+ ingestion connectors and a very wide file-format list mean less pre-processing work
  • API supports programmatic agent creation, which suits agency resale
  • SOC 2 Type II certification is unusual at this price point

Cons

  • Query allowance is the real ceiling and it is low relative to the price
  • The step from Standard to Premium is five times the cost with nothing in between
  • Answer quality still depends entirely on how clean and current your source content is
  • No free plan; evaluation is limited to a trial

Epsilla

Epsilla fits organisations that want a hosted place to assemble document-grounded agents and that value having on-premise or private-cloud options. The self-serve tiers are tight on message volume, so real use quickly moves into the higher plans or the add-on meters.

Pros

  • Agent builder, RAG hosting and monitoring in a single product
  • Managed SaaS, private cloud and on-premise deployment options
  • Clear self-serve pricing with per-seat and per-message add-ons
  • Trust centre and SLA are published

Cons

  • Free tier allows only 50 messages a month and wipes data after 30 days of inactivity
  • Starter and Professional message allowances are listed against a specific OpenAI model, which may constrain model choice
  • Positioning has shifted from vector database to agent platform to harness routing, so documentation can be uneven

Which one fits

Choose CustomGPT.ai if you need

  • Support teams turning an existing help centre into a self-serve answer bot
  • Agencies spinning up client-branded bots and reselling them through the API
  • Companies that need SOC 2 evidence before any AI touches internal documents

Choose Epsilla if you need

  • Teams building internal or customer-facing agents on private documents without an ML team
  • Regulated companies that need private-cloud or on-premise deployment
  • Agencies prototyping vertical agent solutions for clients

CustomGPT.ai vs Epsilla: the questions people ask

Is CustomGPT.ai cheaper than Epsilla?

On published entry prices, Epsilla starts lower — $29/mo against $99/mo for CustomGPT.ai. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does CustomGPT.ai or Epsilla have a free tier?

Epsilla has a free tier; CustomGPT.ai has paid plans only.

Which has a public API, CustomGPT.ai or Epsilla?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

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