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the best AI agents for WhatsApp in 2026.

heysteff is an AI platform for customer support and sales across WhatsApp, Instagram, Messenger, Gmail and Shopify; Steff is the AI agent that runs it. WhatsApp carries most of the customer conversation in LATAM, which is why more tools are fighting for that space than for any other channel. Before comparing options — heysteff included, with full transparency — these are the criteria that matter.

Evaluation criteria

Official and/or unofficial API. Does it connect to the WhatsApp Business Cloud API (verified number), to an unofficial number for businesses that already have one, or only one of the two?
Reasoning AI, not just scripted answers. Does the agent read real context (order, stock, history) and decide, or does it repeat pre-configured answers triggered by keywords?
Sales, not just support. Can it recover a cart, qualify a lead or close a sale, or does it only resolve tickets?
Appointment scheduling. Does it book appointments right in the conversation, synced to a real calendar?
Pricing designed for LATAM. Is the pricing accessible and transparent for an SMB or mid-sized company in the region, or is it calibrated for the US/Europe enterprise market?

heysteff

heysteff connects both the official WhatsApp Business Cloud API (verified number) and an unofficial number via Baileys, for businesses that already have a number in use. The agent reasons with tools over real business data, books appointments synced to Google Calendar, qualifies leads and recovers Shopify carts — all within the same WhatsApp conversation, with native Spanish support and published pricing from 149 USD/month (plus a Free plan of 50 conversations/month to try without a card).

◆ transparency

Yes, heysteff is our tool — we include it here under the same criteria we apply to the others, and this is a judgment you can verify yourself at heysteff.com. It's the better option when you need your WhatsApp bot to sell and book appointments with real data, not just answer FAQs.

WATI

WATI is one of the best-known platforms built specifically around the WhatsApp Business API, focused on support and sales teams that operate almost exclusively on that channel. Best for: teams whose only relevant channel is WhatsApp and who want a tool specialized in that channel alone, with no need to unify Instagram, Messenger or email.

Respond.io

Respond.io is a multichannel messaging platform aimed at sales and marketing teams managing a high volume of inbound conversations from several channels, with a strong focus on flow automation and contact management. Best for: teams with complex sales processes that need very granular routing rules and flow automation.

SleekFlow

SleekFlow is an omnichannel messaging platform with a strong presence in Southeast Asia, built for sales and support teams operating across WhatsApp, Instagram and other channels with a focus on campaign automation. Best for: businesses looking for an omnichannel platform with mature campaign automation capabilities.

ManyChat

ManyChat added WhatsApp support to its historic Instagram and Messenger product, with the same approach of visual button flows aimed at marketing and broadcast, rather than an agent that reasons with business data. Best for: brands whose WhatsApp priority is broadcast and marketing sequences, not context-aware conversational resolution. Full comparison at heysteff vs. ManyChat.

◆ in short

On WhatsApp, the right question isn't "does it have AI?" but "does the AI act on real data from my business, or does it just chat?" That difference is what separates a bot that entertains from an agent that resolves and sells.

Detailed comparisons

For the feature-by-feature detail against a specific competitor, check WhatsApp with AI and the heysteff comparison hub.

◆ next step

Try heysteff on the Free plan with no card required, or get a demo to see the agent replying on your own WhatsApp number.

Get a demo →