Can I put my Custom GPT on WhatsApp or my website?

Not on its own. A Custom GPT lives inside ChatGPT and is used from there; it has no channel of its own toward your customers. Flatzer deploys the agent straight onto your WhatsApp, Telegram and a widget on your website, under your brand.

Does my customer need a ChatGPT account to talk to the agent?

With a Custom GPT, yes: the customer needs ChatGPT (usually Plus) and has to find you in the directory. With Flatzer the customer just opens WhatsApp or your website; nothing to install and no account to create.

Is Flatzer more expensive than ChatGPT Plus?

They are different things. ChatGPT Plus (~USD 20/mo) is a personal assistant; Flatzer (49-179 EUR/mo, flat plan) is an agent deployed on your channels that captures and qualifies leads for your business. Comparing price alone is unfair because they do not solve the same problem.

So are Custom GPTs useless?

Quite the opposite: they are excellent for prototyping, for internal team use and as a personal copilot. If you only want to experiment or get help drafting, a Custom GPT is hard to beat. Flatzer is for when you want to SELL to real customers on their channels.

What happens to the leads from conversations?

With a Custom GPT, conversations stay in ChatGPT and your business never receives the lead data. Flatzer captures name, contact and context from every conversation, hands you the lead and escalates to a person when needed.

Flatzer vs ChatGPT (Custom GPTs)

A ChatGPT (Custom GPTs) alternative that actually reaches your customers

Name: Flatzer — ChatGPT (Custom GPTs) alternative
Brand: Flatzer

A Custom GPT is great for prototyping, but it lives inside ChatGPT: your customers would have to open ChatGPT and look for you. Flatzer deploys the agent on your WhatsApp and your website, where your customers already are.

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Why look for a ChatGPT (Custom GPTs) alternative

People look for an alternative to Custom GPTs the moment they hit an uncomfortable limit: no matter how good the GPT you built is, it lives inside ChatGPT. To use it, your customer has to open ChatGPT, hold a paid account and find you in the GPT directory. That is not a sales channel: it is a personal assistant that almost none of your audience will ever reach. There is no WhatsApp number of yours, no website of yours, no brand of yours and, above all, no lead landing in your inbox. The conversation, if it happens at all, stays inside ChatGPT and your business never hears about it. That is why anyone who wants to SELL, rather than just prove they can configure a GPT, ends up looking for a tool that puts that same agent where their customers already are.

When ChatGPT (Custom GPTs) is the best choice

Let us be honest: ChatGPT and Custom GPTs are excellent, and there are cases where they are the best choice. If what you want is to PROTOTYPE fast — test a sales script, tune the tone, see how an assistant would answer the typical questions in your sector — spinning up a Custom GPT takes minutes and you need nothing else. It also shines as an internal tool: drafting, summarizing, preparing replies or helping your team move faster. And if your usage is personal or exploratory, the USD 20/mo for ChatGPT Plus is a bargain for the power OpenAI delivers. If your goal is to learn, experiment or have a copilot for yourself, a Custom GPT is hard to beat and you do not need to pay for anything else.

When Flatzer fits better

Flatzer starts exactly where the Custom GPT runs out of road: when you want the agent to serve REAL CUSTOMERS, not you inside ChatGPT. With Flatzer the agent is deployed on your WhatsApp, your Telegram and a widget on your website, under your brand, with nothing for the customer to install and no account to create. The AI onboarding interviews your business and auto-generates the configuration, so you do not start from a blank prompt. And the part that actually changes the outcome: every conversation captures the lead — name, contact, context — qualifies it and hands it to you, with escalation to a person when needed. You move from "I have a cool GPT" to "I have an agent that turns conversations into pipeline". Pricing is flat (49-179 EUR/mo) and built to sell, not to chat. If your customer is on WhatsApp and you want AI working for your business, that is the difference.

Flatzer vs ChatGPT (Custom GPTs), compared

Feature	ChatGPT (Custom GPTs)	Flatzer
Where the agent lives	Inside ChatGPT; the customer needs their own account	On your WhatsApp and your website, where customers already are
Channel to the customer	None of its own: people must find you in the GPT directory	WhatsApp, Telegram and an embedded web widget on your domain
Lead capture	Does not capture lead data for your business	Captures name, contact and context, and hands you the lead
Prototyping and experimentation	Excellent: standing up an assistant takes minutes	AI onboarding that interviews your business and generates the config
Requirement for the customer	Customers need ChatGPT Plus to use your GPT	Customers only need WhatsApp or your site; nothing to install
Brand and domain	Appears under the ChatGPT brand, not yours	Under your brand, on your WhatsApp number and your domain
Human handoff	No built-in escalation to a person on your team	Escalates to a human when needed and logs the conversation
Entry price	ChatGPT Plus ~USD 20/mo (personal use of the assistant)	Flat 49-179 EUR/mo plan built to sell, not just to chat

Where the agent lives

ChatGPT (Custom GPTs)Inside ChatGPT; the customer needs their own account

FlatzerOn your WhatsApp and your website, where customers already are

Channel to the customer

ChatGPT (Custom GPTs)None of its own: people must find you in the GPT directory

FlatzerWhatsApp, Telegram and an embedded web widget on your domain

Lead capture

ChatGPT (Custom GPTs)Does not capture lead data for your business

FlatzerCaptures name, contact and context, and hands you the lead

Prototyping and experimentation

ChatGPT (Custom GPTs)Excellent: standing up an assistant takes minutes

FlatzerAI onboarding that interviews your business and generates the config

Requirement for the customer

ChatGPT (Custom GPTs)Customers need ChatGPT Plus to use your GPT

FlatzerCustomers only need WhatsApp or your site; nothing to install

Brand and domain

ChatGPT (Custom GPTs)Appears under the ChatGPT brand, not yours

FlatzerUnder your brand, on your WhatsApp number and your domain

Human handoff

ChatGPT (Custom GPTs)No built-in escalation to a person on your team

FlatzerEscalates to a human when needed and logs the conversation

Entry price

ChatGPT (Custom GPTs)ChatGPT Plus ~USD 20/mo (personal use of the assistant)

FlatzerFlat 49-179 EUR/mo plan built to sell, not just to chat

An agent with a flat monthly price

1,000 messages a month on Starter. Upgrade when your business demands it.

Starter

$52.95/month

1,000 messages/month

1 channel (WhatsApp)

Monthly AI usage included, with a monthly cap

Isolated environment for your agent

Email support

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