Reply Flow is a custom AI agent builder for customer conversations on WhatsApp and email. Train an agent on your business in minutes, tune it as deeply as you need, and let your team step in only when a human really needs to.
No credit card · Cancel anytime · Set up in 10 minutes"Did the order ship yet? It was supposed to arrive…"
"Need a quote for 80 units, see attached spec…"
"What time do you close on Sunday?"
Generic AI is trained on the internet, not your business. It doesn't know your refund policy. It can't see whether the order shipped. It hallucinates pricing. It hands off to a human five seconds in. The good leads bounce. The bad ones tie up an agent for twenty minutes asking about your return window.
Each Reply Flow agent is a list of scenarios — the moments your customers actually have. For every scenario you write the trigger (when it applies) and the instructions (what to do). No prompt engineering. No giant system prompt to maintain. Plain English, the way you'd brief a new hire on day one.
Trigger customer asks where their order is, or mentions an order number
Then look up the order, reply with the latest status, ETA, and the tracking link
Trigger customer asks for a quote, or mentions 25+ units
Then don't quote — tell them a teammate will follow up within an hour, hand off to sales
Trigger first message from a contact between 10pm and 7am local time
Then acknowledge, set expectations for the morning, share self-serve docs
Reply Flow agents don't just talk. They call your business systems as tools, mid-conversation. They look up the order in Shopify before quoting an ETA. They check Airtable before promising a slot. They read your Google Sheet before pricing a quote. Every reply is sourced from your live data — not guessed at.
"Did the order ship yet? It was supposed to arrive Tuesday."
"It shipped Monday — USPS, expected Friday. Tracking 9400 1110 2070 4837 1234. Anything else?"
Most of the time the agent handles it. When a human really needs to step in — a refund, a custom quote, a sticky complaint — the conversation lands in your team's inbox already tagged, already routed, with the AI's draft and source data attached. They reply. You ship.
We trained an agent on our help docs and pointed it at our Shopify. Now it answers order-status questions before our team even sees them. First-reply time went from 11 minutes to 38 seconds — and we stopped hiring at five.
One flat monthly price. Agents, scenarios, and connectors on every plan. Extra messages and KB pages billed transparently.
For solo operators trying it out — one inbox, one agent, your help docs.
Overage: $0.03 / extra message · $0.05 / extra KB page
The full agent builder. Multiple agents across multiple inboxes.
Overage: $0.02 / extra message · $0.04 / extra KB page
For ops teams running multiple businesses or multi-channel operations.
Overage: $0.015 / extra message · $0.03 / extra KB page
Couldn't find yours? Email [email protected] — a real person replies in under an hour during business hours.
About 60 minutes for most teams. Connecting your Gmail and WhatsApp takes five. The rest is writing your first scenarios — the situations your customers actually have, with the triggers that recognize them and the instructions you'd give a new hire on day one. We're happy to walk you through it; no onboarding call required.
No. Agents only reply when an incoming message matches a scenario you've written. You set the rules; the agent works inside them. For anything you didn't plan for — refunds, VIPs, anything ambiguous — it steps aside and the conversation goes to your team.
No. Reply Flow runs on official, fully-compliant WhatsApp infrastructure. Opt-in flows, message templates, and the 24-hour reply window are managed for you — so the things that get accounts banned (cold-blasting strangers, sending after the window without an approved template) can't happen by accident.
No. Reply Flow sends from your own Gmail or Google Workspace account — deliverability is exactly the same as when you write the email yourself. Your domain, your reputation, your inbox placement. Nothing relays through our servers.
When an agent steps aside, the inbox routes the conversation to the right person — by tag, by load (round-robin or least-busy), or to a specific teammate. If they don't reply in time, it nudges them, escalates if needed, and keeps the customer informed. Everyone sees who's working on what, and you control who has access to which conversations.
Your conversations, contacts, and knowledge bases live in your private Reply Flow workspace — encrypted, isolated from every other company's, and never used to train any model. SOC 2 Type II is in progress; available now under NDA.
Both. Agents look up the order in your store, check stock in your spreadsheet, validate a coupon in your database — then reply with what they found. You connect the systems you use (Shopify, WooCommerce, Airtable, Supabase, Google Sheets, or any custom one) and pick which scenarios are allowed to use them.
Yes. Pro and Scale plans let you stack multiple agents on one WhatsApp number or email account, and route between them by contact, intent, or scenario. A sales agent can take pre-purchase questions; a support agent handles tickets after.
Cancel anytime. No annual contracts, no early-termination fees. If you stop, your data is yours — we'll help you export it.
Yes. Existing Gmail / Google Workspace accounts connect in one click. Existing WhatsApp Business numbers can be migrated over — we walk you through it.
Only the replies your agent actually sends. Inbound messages, drafts you discard, and replies you write yourself don't count toward your monthly total.
Whichever language the customer wrote in. The agent reads the incoming message, matches it to a scenario, and replies in the same language — without you toggling anything.
A blend of Anthropic's Claude (for reasoning and tool use) and OpenAI (for embeddings on your knowledge base). You don't pick — Reply Flow chooses the right model for each step automatically.
Yes. The AI can prepare a reply and queue it in your inbox for a teammate to send with one click — useful while you're tuning a new agent, or for trickier conversations where you want a human eye before the message goes out.
Yes. Anything that speaks REST plugs in — paste an OpenAPI spec or a cURL example and Reply Flow wires it as a tool the agent can call. We can also fire outbound webhooks when conversations hit specific states (handoff started, agent stepped aside, contact tagged), so your downstream systems stay in sync.
Yes. Every contact has a profile — past conversations, tags, custom fields, order history if you've connected your store. Mention an order or quote a previous reply and the agent has the context.
Yes. Reply Flow tracks the links your agents send and ties them back to orders pulled from Shopify, WooCommerce, or Stripe. Filter by campaign, by agent, by date — see what's working without leaving the inbox.
Whatever you tell it. Write an "after-hours first message" scenario with the response you want — acknowledge, set expectations for the morning, point to self-serve docs. The agent applies it the moment a message arrives outside your team's hours.
14 days free. No credit card. Connect your channels, write your first scenarios, and have your agent answering customers within the hour.