Trengo alternatives in 2026: what the six real options cost

The short answer

Trengo's Boost plan costs EUR 299 a month on annual billing, or EUR 349 month to month, for 10 users and 6,000 conversations a year. Conversations above the allowance cost EUR 15 per 100 on annual billing and EUR 18 per 100 on monthly billing. Users above the ten included cost EUR 25 each a month on annual billing and EUR 30 on monthly. Once customer volume passes about 23 conversations a working day, the software bill rises with the sales.

Every price in this article was read from the vendor's own pricing page on 24 August 2026, and each one is linked below.

The metering problem in shared inboxes

Trengo counts conversations and users together. The Boost plan includes 6,000 conversations across 12 months, which is 500 a month, or about 23 inbound contacts a business day for the whole team.

Trengo defines a conversation as any reply to an inbound or outbound message with a customer inside a 7-day window, and any message outside that window starts a new one. So the meter counts customer behaviour rather than staff effort.

A marketing push brings new buyers. A carrier delay in December brings tracking questions. Each block of 100 conversations above the allowance adds EUR 15 or EUR 18 to the invoice, depending on how you are billed. Five extra people to handle the period add EUR 125 to EUR 150 a month on top. The software costs the most in the months when the business is busiest. (Trengo pricing)

What Trengo does well

Trengo got early access to the WhatsApp Business API and built solid tooling around it. Non-technical staff can build automated flowbots in the visual editor without writing code. The company is based in Utrecht, so support works European hours and answers the phone. For a Benelux retailer with an established catalogue, a steady message count, and a stable headcount, the standard plan is a safe purchase.

Trengo and five alternatives

Trengo

Trengo is a WhatsApp-focused shared inbox combining visual flowbots with European phone support. The price depends on conversation volume and user count. It suits regional commerce brands with steady support queues and fewer than 500 customer threads a month.

Front

Front organises team communication around an email-first interface with routing rules and internal comments. Starter is USD 25 per seat a month billed annually and caps at 10 seats. Professional is USD 65 per seat a month billed annually and covers up to 50 seats. Enterprise is USD 105 per seat a month. Cost stays predictable across quarters because the meter counts seats rather than messages. Front fits companies that run vendor orders over email, and it fits badly when the operational history lives in Telegram or another mobile chat app. (Front pricing)

Intercom

Intercom provides an in-app messenger, a knowledge base, and an AI agent called Fin. The Essential plan lists at USD 29 per seat a month, with a 35 per cent new-customer discount showing USD 19 on the page on 24 August 2026. Advanced is USD 85 per seat and Expert is USD 132 per seat. Fin is billed separately, from USD 0.99 per outcome, so 400 questions handled by Fin in a month adds about USD 396. Software companies with web products get strong onboarding tools here, and high volume through Fin moves the bill quickly. (Intercom pricing)

Zendesk

Zendesk is a standard support tool for large service departments running formal ticketing. Support Team is USD 19 per agent a month paid yearly and covers email and ticketing. Suite Team, which adds messaging, live chat, and telephony, is USD 55 per agent a month paid yearly, and Suite Professional is USD 115. Zendesk brings a large plugin marketplace, detailed reporting, and consultants who already know the product. Every interaction becomes a ticket with an ID, which is clumsy for a multi-year supplier conversation that never reaches a closed state. (Zendesk pricing)

Respond.io

Respond.io specialises in instant messaging channels with broadcast tools and outbound campaign automation. Starter is USD 99 a month month-to-month, or USD 79 a month billed yearly. Growth is USD 199 or USD 159. Advanced is USD 349 or USD 279. Growth and Advanced include 1,000 Monthly Active Contacts, which counts any person you talk to during the billing month. Contacts above the allowance are billed on demand at USD 12 per 100 on Growth and USD 15 per 100 on Advanced, and respond.io states that on-demand contacts are meant for temporary spikes rather than sustained volume. Growth includes 10 users with extra users at USD 20 a month; Advanced includes 10 with extra users at USD 24. (Respond.io pricing)

CommunicationOS

CommunicationOS connects 19 messaging networks into one inbox, covering networks with official business interfaces and networks you connect as an account you already use. The price scales by connected accounts through the published pricing tiers, with teammates and message volume included on every tier. Read and export access stays open for 30 days after cancellation. The product suits logistics coordinators and operations teams running high message volume across international client accounts.

Comparing year-one costs

One workload, six invoices. The scenario:

• 15 staff who read and send messages
• 24,000 conversations across 12 months, averaging 2,000 a month
• 8 connected communication accounts
• Annual billing where the vendor publishes an annual rate, with the month-to-month figure shown beside it
• Published currency units kept as published, with no conversion. The euro and dollar figures sit side by side as each vendor published them on 24 August 2026

How the Trengo total is calculated

On annual billing:

• Boost base at EUR 299 a month for 12 months: EUR 3,588
• Five users above the 10 included, at EUR 25 each a month: EUR 1,500
• Conversations above the 6,000 allowance: 18,000, which is 180 blocks of 100 at EUR 15: EUR 2,700
• Total: EUR 7,788

On monthly billing, the base is EUR 349, extra users are EUR 30 each, and extra conversations are EUR 18 per 100, which brings the year to EUR 9,228.

How the Front total is calculated

The 15-seat team cannot use Starter, because Starter caps at 10 seats. Professional at USD 65 per seat a month billed annually, for 15 seats over 12 months, is USD 11,700. Front is the most expensive row here, and it is also the only row whose invoice does not move when customer volume doubles.

How the Intercom total is calculated

Essential at the list rate of USD 29 per seat a month, for 15 seats over 12 months, is USD 5,220. Fin is metered separately. Assume Fin handles a fifth of the traffic, which is 4,800 outcomes across the year at USD 0.99, adding USD 4,752 and bringing the total to USD 9,972. Change the share Fin handles and that second number moves with it.

How the Zendesk total is calculated

Support Team at USD 19 per agent a month paid yearly, for 15 agents over 12 months, is USD 3,420. That tier covers email and ticketing. Adding messaging, live chat, and telephony means Suite Team at USD 55 per agent, which is USD 9,900 for the same team.

How the Respond.io total is calculated

Respond.io counts contacts rather than threads, so the 24,000 conversations have to be restated: assume 2,000 distinct contacts a month. Growth at USD 159 a month billed yearly, plus five users above the 10 included at USD 20 each, plus 10 on-demand blocks of 100 contacts at USD 12, is USD 379 a month, or USD 4,548 for the year. On monthly billing the base is USD 199 and the year is USD 5,028. Moving to a higher contact tier instead of paying on demand changes the base rate, and respond.io publishes that rate only through the contact selector on its pricing page.

How the CommunicationOS total is calculated

The Team plan is USD 79 a month and includes 10 connected accounts, which covers the 8 in this scenario. Neither the fifteen teammates nor the 24,000 conversations add anything to that. Twelve months at USD 79 is USD 948. Paid annually the rate is USD 66 a month, so the year is USD 792.

Seat-metered platforms cost less than Trengo for a mid-sized team on high message volume, and a seat meter is predictable while headcount holds steady. Trengo creates budget pressure through its conversation cap. Intercom creates budget pressure through Fin, because the bill grows as the AI agent succeeds.

Where each one breaks

Each platform has a point past which it stops fitting.

Trengo sets its conversation allowance on an annual clock, so a growing business meets a cost step partway through the year when the 6,000 runs out. Front was built for email, so a team coordinating logistics over consumer chat apps fights the inbox structure. Intercom is strong for product onboarding, and its per-outcome meter turns routine volume into a monthly variable.

Three more structural limits:

• Zendesk pushes every interaction into a ticket that an agent resolves and closes. That fits a high-volume IT desk. It fits badly for a five-year supplier relationship with no finished state.
• Respond.io bills when passive contacts reply to a broad broadcast, because each respondent counts against the monthly active contact allowance.
• CommunicationOS is younger than Zendesk, with no enterprise help centre builder and no marketplace of third-party add-ons.

The long-term history problem

Shared inbox software treats a conversation as a task. The interface pushes agents to resolve threads and clear queues, and the software then files the text into cold storage. That assumes every customer problem has a start and an end.

A software agency does not work that way. An account manager talks to the same client contact for years across WhatsApp, Slack, and email. When a launch slips and the invoice is queried, the question is which date the client asked for and when they asked for it, not how fast a ticket closed in 2023. The answer is one message in a thread that was never a ticket.

Export terms decide whether you can take that record with you. A ticketing tool that exports CSV rows of tickets drops the attachments, media timestamps, and voice notes along with them. CommunicationOS exports up to 25 GB per archive on the Scale plan, with the original media included, as described in the data export documentation. The conversation history architecture covers what the index holds.

How to choose

Four questions decide most of it.

1. How many messages arrive in your busiest month? Above 500, work out the conversation overage before you sign.
2. Does your team work mainly over email, or do clients expect WhatsApp, Telegram, and WeChat?
3. Do you resolve isolated tickets, or manage long relationships where somebody has to read back through last year's agreement?
4. How many people need read access to customer threads to do their own job?

The Trengo feature breakdown covers the functional differences, and the security and compliance page covers enterprise deployment.