Why do small businesses look for a Trengo alternative?

Price shape, mostly. Trengo's Boost plan is €299 a month billed annually (€349 monthly) for ten users and 500 conversations a month, with extra conversations at €18 per 100 and an AI surcharge of €0.30 per conversation. A two-person business on one WhatsApp number pays for eight seats it never uses.

What is the cheapest Trengo alternative for WhatsApp?

For a single WhatsApp number with AI included, Replai at $19 a month is the lowest flat price in this list, with no Meta per-message fees because it pairs to your existing number. Among official-API tools, Wati's Growth plan is $39 to $59 a month billed annually depending on your country, plus Meta's message fees.

Which Trengo alternative is best for a support team, not a solo owner?

Respond.io. Its Starter plan is $79 a month billed annually for five users with unlimited contacts, and it covers WhatsApp, Instagram, Messenger, LINE and web chat in one inbox with assignment and reporting. It is the closest like-for-like replacement for a team that actually needs a shared inbox.

Do these alternatives charge WhatsApp per-message fees?

Every tool built on the official WhatsApp Business API passes Meta's per-message fees through: Respond.io, Wati, Interakt, AiSensy, Tidio, ManyChat and Trengo itself. Marketing messages cost roughly $0.01 to $0.09 each depending on country. Replai has no per-message fees because it connects as a linked device rather than through the API.

Is a QR-paired tool like Replai as reliable as the official API?

No, and it is honest to say so. Linked-device bots are unofficial, so WhatsApp can restrict a number that behaves like spam. Replai mitigates that with rate limits, jittered timing and warm-up, but a business that sends bulk marketing or cannot tolerate a restriction should stay on an official-API tool.

7 Trengo alternatives for WhatsApp in 2026

Quick answer

Trengo Boost is 299 euros a month billed annually for ten users and 500 conversations, with extra conversations at 15 to 18 euros per 100 and AI at 0.25 to 0.30 euros each. For one WhatsApp number, compare Replai at $19 flat, Tidio at $24, ManyChat at $29, Wati at $39 to $69, AiSensy at $45 and Respond.io at $79.

Trengo Boost is 299 euros a month billed annually for ten users and 500 conversations.
Trengo adds 0.25 to 0.30 euros per AI conversation and 25 to 50 euros per extra user.
Respond.io at $79 for five users is the closest like-for-like team inbox.
Replai is $19 to $99 a month flat, pairs by QR, and charges nothing per message.

Trengo is a shared-inbox product for mid-sized support teams: WhatsApp, email, voice, live chat and social in one place, priced from €299 a month billed annually for ten users. If you are a small business whose customers live on WhatsApp and you do not have ten agents, you are paying for a shape you do not need. These seven alternatives are compared on prices verified from each vendor's pricing page in September 2026, and grouped by who they actually suit rather than ranked by marketing budget.

How much does Trengo cost in 2026?

Plan	Annual billing	Monthly billing	Users	Conversations
Boost	€299/mo	€349/mo	10	500 a month (6,000 a year)
Pro	€499/mo	€599/mo	20	1,500 a month (18,000 a year)
Enterprise	Custom	Custom	Custom	Custom

Add-ons: extra conversations €15 to €18 per 100, AI surcharge €0.25 to €0.30 per conversation, extra users €25 to €50 each. WhatsApp runs through the official API, so Meta's per-message fees apply on top.

Which Trengo alternatives suit a small business?

Six of the seven reach WhatsApp the way Trengo does, and that adds a bill the table cannot show. Since 1 July 2025 the WhatsApp Business Platform has charged per delivered template message, whether marketing, utility or authentication, while non-template replies inside the 24-hour customer service window are free (Meta for Developers, 2025). Only the QR-paired row escapes it, because it connects as a linked device rather than through the API.

Tool	From	WhatsApp	AI included	Best for
Respond.io	$79/mo	Official API	Credits	Support teams
Wati	$39-69/mo	Official API	Add-on	Broadcasts
Replai	$19/mo flat	QR pairing, no fees	Yes	One to five numbers
Tidio	Free, $24/mo	Official API	Limited	Website chat first
Interakt	$55/mo	Official API	Flows	Indian D2C
AiSensy	$45/mo	Official API	$80 extra	Indian broadcasts
ManyChat	Free, $29/mo	Official API	Pro+	Instagram creators

Ten seat icons with two filled and eight faded, and a block of five hundred squares with only a small strip filled, showing the capacity a two-person business pays for on Trengo Boost at 299 euros a month but cannot use. — The entry plan is shaped for a mid-sized support team, and a smaller business pays for that shape.

1. Respond.io: the like-for-like replacement for a team

If what you liked about Trengo was the shared inbox, Respond.io is the closest match at a lower entry price. Starter is $79 a month billed annually ($99 monthly) for five users with unlimited contacts and 5,000 AI credits; Growth is $159 billed annually for ten users. WhatsApp, Instagram, Messenger, WeChat, LINE, SMS and web chat land in one inbox with assignment and reporting. It is an official Business Solution Provider, so Meta's per-message fees pass through. Full breakdown in Respond.io pricing in 2026 and Replai vs Respond.io.

Pick it if you have a support team of three or more and more than one channel.

2. Wati: for WhatsApp marketing at volume

Wati is built around the official API for broadcasts, template campaigns and a team inbox. Prices are geo-based: Growth is $59 a month billed annually in the US and UAE, $39 in most of Asia and Africa, and ₹2,199 in India. Its AI assistant is a paid add-on and Meta fees apply. See Wati pricing in 2026 and Replai vs Wati.

Pick it if outbound campaigns to a large opted-in list are your main use.

3. Replai: flat price, AI included, no API

Replai pairs to the WhatsApp number you already have as a linked device, so there is no Meta application, no verification wait and no per-message fee. Starter is $19 a month for one number and 120 conversations a cycle; Growth is $49 for up to three numbers, 300 conversations and campaigns; Pro is $99 for five numbers and 600. The AI is included, it answers from a knowledge base you control, handles voice notes and images, and follows the customer's language. New accounts answer new conversations only, so pairing a live number does not put the bot into your existing chats. A conversation is one thread of up to five replies; top-ups are 100 conversations for $9, or $8 on Growth and $7 on Pro. There is a 7-day free trial with no card.

The honest caveat: it is unofficial, so a restriction is possible and we publish how to think about that risk. It is also WhatsApp only.

Pick it if you are a small business whose problem is the inbound queue and you want one flat bill. See Replai vs Trengo.

4. Tidio: if web chat is your first channel

Tidio's free plan includes WhatsApp and 50 one-time Lyro AI conversations; Starter is $24.17 a month, Growth from $49.17, and Plus is $300 plus usage. It is strongest as a website live-chat widget that also reaches WhatsApp through the official API. Per-conversation AI pricing is not published for most tiers. See Replai vs Tidio.

Pick it if most enquiries start on your website, not on WhatsApp.

5. Interakt: Indian D2C on the official API

Interakt's Growth plan is $55 a month plus taxes for WhatsApp and Instagram with linear chatbot flows; Advanced is $69 with branching flows and API calls. It marks up Meta's message rates by roughly 10 to 39 percent depending on plan. Details in Interakt pricing in 2026.

Pick it if you are an Indian brand that wants catalogues, payments and broadcasts on the API.

6. AiSensy: Indian broadcasts, chatbot extra

AiSensy's Basic plan is ₹1,500 a month in India or $45 outside, Pro is ₹3,200 or $99, with a free forever tier for the API itself. The chatbot builder is a separate ₹2,500 or $80 a month, and Indian users pay about 26 percent above Meta's rate card per message. Details in AiSensy pricing in 2026.

Pick it if you run high-volume Indian marketing campaigns and can live without AI answers.

7. ManyChat: creators on Instagram and Messenger

ManyChat's Free plan covers 25 active contacts, Essential is $14 a month for 250, Pro is $29 for 2,500 with AI conversations, and Business is $69 for 7,500; extra contacts are billed per head. It is Instagram and Messenger first, with WhatsApp through the official API and Meta's fees on top. See Replai vs ManyChat.

Pick it if your audience comes from Instagram DMs and WhatsApp is secondary.

How to choose

You need a shared inbox for a team: Respond.io.
You send large broadcasts to an opted-in list: Wati, or Interakt and AiSensy in India.
You want one WhatsApp number answered 24/7 for a flat price, with AI included and no API: Replai.
Your enquiries start on a website: Tidio.
Your audience lives in Instagram DMs: ManyChat.

Trengo remains a reasonable product for the team it was designed for. The point of this list is that a two-person business with one WhatsApp number is not that team.

Frequently asked questions

Why do small businesses look for a Trengo alternative?: Price shape, mostly. Trengo's Boost plan is €299 a month billed annually (€349 monthly) for ten users and 500 conversations a month, with extra conversations at €18 per 100 and an AI surcharge of €0.30 per conversation. A two-person business on one WhatsApp number pays for eight seats it never uses.
What is the cheapest Trengo alternative for WhatsApp?: For a single WhatsApp number with AI included, Replai at $19 a month is the lowest flat price in this list, with no Meta per-message fees because it pairs to your existing number. Among official-API tools, Wati's Growth plan is $39 to $59 a month billed annually depending on your country, plus Meta's message fees.
Which Trengo alternative is best for a support team, not a solo owner?: Respond.io. Its Starter plan is $79 a month billed annually for five users with unlimited contacts, and it covers WhatsApp, Instagram, Messenger, LINE and web chat in one inbox with assignment and reporting. It is the closest like-for-like replacement for a team that actually needs a shared inbox.
Do these alternatives charge WhatsApp per-message fees?: Every tool built on the official WhatsApp Business API passes Meta's per-message fees through: Respond.io, Wati, Interakt, AiSensy, Tidio, ManyChat and Trengo itself. Marketing messages cost roughly $0.01 to $0.09 each depending on country. Replai has no per-message fees because it connects as a linked device rather than through the API.
Is a QR-paired tool like Replai as reliable as the official API?: No, and it is honest to say so. Linked-device bots are unofficial, so WhatsApp can restrict a number that behaves like spam. Replai mitigates that with rate limits, jittered timing and warm-up, but a business that sends bulk marketing or cannot tolerate a restriction should stay on an official-API tool.

Sources

WhatsApp Business Platform pricing, Meta for Developers, 2025-07-01
WhatsApp Business crosses 200M MAUs, introduces personalized messages feature, TechCrunch, 2023-06-27

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