Do I need the WhatsApp Business API or message templates?

The three things people mix up

What WarmySender actually uses

WarmySender connects to your number as a linked device. You open WhatsApp → Numbers in WarmySender, and on your phone go to Settings → Linked devices → Link a device and scan the code (or type a short pairing code if you can't scan). WarmySender then appears in your own Linked devices list, exactly like WhatsApp Web or the desktop app, and you can remove it from your phone at any time. There is no password anywhere in this flow.

Because it is the app path, the whole apparatus of the Business Platform simply doesn't apply:

• No message templates. You write each message in plain language. Nothing is submitted to Meta and nothing waits for approval.
• No 24-hour session window to manage. That window is a Platform rule (more on it below); on the app path you reply to people from one inbox like you always have.
• No per-message or per-conversation fees. WarmySender is a flat per-number seat — one seat connects one number — rather than the metered, conversation-based pricing the Platform uses.
• No quality rating or tier to climb. Those are Platform mechanics. What paces your sending on WarmySender is a fixed per-number safety budget, described in how WhatsApp sending limits keep your number safe.

Step by step, with the "can't scan" fallback and what happens if a number needs re-linking: how to connect your WhatsApp number.

What are message templates and session messages?

These are Business Platform ideas, and it is worth knowing them so you can recognise that WarmySender doesn't use either. On the Platform, when a person messages a business, Meta's developer documentation describes a 24-hour timer called a customer service window opening. Inside that window a business can send free-form (session) messages. Once it closes, you can only send pre-approved template messages until the person writes again (Meta, WhatsApp Platform documentation).

That is why Platform senders build libraries of templates and submit them for approval: outside a live conversation, a template is the only message type allowed. On the app path WarmySender uses, there is no template requirement to satisfy — but the spirit behind the rule still holds, and it is the next section.

Opt-in: the rule that applies on every path

Whichever path a business is on, WhatsApp's rules on who you may message are the same, and they are strict. The WhatsApp Business Messaging Policy states that a business may only contact people on WhatsApp once you have received opt-in permission from the recipient confirming they want to hear from you (WhatsApp Business Messaging Policy). The opt-in has to make clear that the person is agreeing to receive messages, and from whom.

This is the part no product can waive, and WarmySender does not pretend to. Messaging a purchased or scraped list of strangers who never opted in is against WhatsApp's policy on both the app and the Platform, and it is not what WarmySender is for. It is also the fastest way to lose a number: WhatsApp restrictions are driven far more by recipients blocking and reporting you than by raw volume, and the number at risk is your own phone number, which nobody can restore for you.

Meta's own spam policy makes the behavioural line explicit — its Community Standards on spam bar acting at very high frequencies, manually or automatically (Meta, Community Standards on spam). WarmySender is built to stay on the right side of that: it sends genuinely one-to-one, paces every message, caps first messages to new people, and automatically tightens that cap when your first messages aren't earning replies. Use it to reach people who have a real reason to hear from you — existing contacts, people who enquired, people who opted in — not a cold list.

Messaging limits and quality tiers (a Platform concept)

If you have read about WhatsApp "messaging limit tiers", those belong to the Business Platform, not to WarmySender. On the Platform, Meta sets a limit on how many people a business may start a conversation with in a rolling 24 hours, at the business-portfolio level, and a number climbs the tiers by sending high-quality messages at volume. Meta's documentation lists the tiers as 250, 2,000, 10,000, 100,000 and unlimited business-initiated conversations per 24 hours (Meta, WhatsApp messaging-limits documentation).

WarmySender does not use those tiers at all. Its pacing is a fixed, conservative per-number budget instead: up to 60 messages a day, of which at most 20 may be first messages to people you have never messaged before, no more than 8 in any hour, with a natural 45-second-to-2-minute pause between messages, and a multi-week ramp for a new number. Those are ceilings, not settings — nothing raises them, and the way to reach more people is to connect another number, each with its own independent budget. Full detail: how WhatsApp sending limits keep your number safe.

So — do I need any of this?

• The WhatsApp Business Platform (API)? No. WarmySender does not use it and you do not need to set it up. Connect the app you already have.
• Message templates? No. You write plain-language messages; nothing is submitted for approval.
• The WhatsApp Business app specifically? Optional. WarmySender connects the ordinary WhatsApp app and the WhatsApp Business app in exactly the same way, under the same limits. Use whichever you already have.
• Opt-in from the people you message? Yes — always, on every path. That is a WhatsApp rule, not a WarmySender setting, and it is the one thing you genuinely have to get right.

Common questions

Do I need to apply for the WhatsApp Business API to use WarmySender?

No. WarmySender links to the WhatsApp app on your phone as a device, the same way WhatsApp Web does, so there is nothing to apply for. The WhatsApp Business Platform (the API) is a separate, paid platform for programmatic sending at scale, and WarmySender does not use it. You connect the number you already have and start from there.

Do I have to create and get message templates approved?

No. Templates are a Business Platform requirement — on that platform, outside a live 24-hour conversation window you may only send pre-approved templates. WarmySender uses the app path instead, so you write each message in plain language and nothing is submitted to Meta for approval or waits in a review queue.

What is the difference between a template message and a session message?

Both are Business Platform terms. A session (free-form) message can be sent only within 24 hours of the person's last message to the business; once that window closes, only a pre-approved template message may be sent until they write again. On the app path WarmySender uses, there is no session window to track and no template to pick — but the intent behind the rule, that people should expect your messages, still applies through the opt-in requirement below.

Do I need the WhatsApp Business app, or does the normal app work?

Either works, and it makes no difference to WarmySender. Both connect the same way, send the same kind of plain-language messages, and sit under exactly the same sending limits and ramp. If your number is registered as a business one, WarmySender simply shows a small "Business" label on its card — a label, not a different set of rules.

Can I message a purchased or scraped list of people who never contacted me?

No. WhatsApp's Business Messaging Policy requires opt-in permission from the people you message on both the app and the Platform, so cold-messaging a bought or scraped list of strangers is against the rules and is not what WarmySender is for. It is also the surest way to get your number blocked and reported. Use WhatsApp for people who have a genuine reason to hear from you — contacts, enquirers, and people who opted in.

Are there per-message or per-conversation fees like the API has?

No. The Business Platform prices by conversation; WarmySender is a flat per-number seat — one seat connects one number — with no per-message or per-conversation charge on top. To reach more people you connect another number rather than paying per message, and each number keeps its own independent daily, first-message and hourly budget.

Related guides

• How to connect your WhatsApp number — the linked-device flow, step by step
• How WhatsApp sending limits keep your number safe — the per-number budget and ramp
• How to run a WhatsApp campaign — build a sequence that lives inside those limits
• How to build your WhatsApp audience — a well-qualified, opted-in list is what keeps a number safe
• Full documentation