WhatsApp platforms compared
Trengo and MessageBird, now trading as Bird, sit at opposite ends of the same market: one is a finished helpdesk your team logs into and pays for by conversation, the other is a set of channels your developers build on and pay for by volume. This comparison puts both side by side on pricing, automation and ecommerce reporting, so you can see which one fits your store and where a platform built for ecommerce messaging fits alongside them.
Best for: support organisations that want a finished helpdesk across channels and can predict their conversation volume.
From EUR 299 per month billed annually, metered by conversations rather than seats.
Rating for ecommerce
Best for: engineering teams that want email, SMS, WhatsApp, voice and RCS billed purely by volume with no seat fees.
Priced by volume, not by seat. No platform fee, no per seat charge, published per use rates.
Rating for ecommerce
Best for: established ecommerce brands that want WhatsApp and SMS run as a revenue channel, with every order attributed to the message that drove it.
One usage based rate per message, unlimited users, platform and managed service included.
Rating for ecommerce
The full comparison
Everything below is taken from what each company publishes about itself. Where a vendor does not publish something, the cell says so instead of guessing.
| Capability | TrengoCustomer engagement | MessageBirdChannels API | ZefirRevenue platform |
|---|---|---|---|
| What you are actually buying | |||
| Product category | HelpdeskCustomer engagement platform across chat, email and voice | Channels APIProgrammable channels you build your own product on | Managed channelAI WhatsApp and SMS revenue platform built for ecommerce |
| Who operates the channel | Your teamYou staff the inbox and build the automations | Your engineersYou build the sending logic, the interface and the reporting | Zefir operates itChannel built and operated by Zefir, per their pricing page |
| Ready on day one | YesA finished interface your team logs into | NoA set of APIs and published rates | YesBuilt and operated for you |
| Channel coverage | |||
| Included | Pay as you go | YesSetup and templates handled for you | |
| SMS as a marketing channel | Support channelPresent as a conversation channel, not a campaign channel | Pay as you go | YesWhatsApp and SMS on the same platform and the same rate model |
| Breadth | Chat, email, voice, social | Email, SMS, WhatsApp, voice, RCS | Two by designWhatsApp and SMS only, plus AI conversations |
| Ecommerce and revenue | |||
| Shopify connection | Integrations existPositioned around support workflows rather than store revenue | You build it | One clickStore connected on day one, data syncing from the start |
| Per order revenue attribution | Not publishedReporting is built around conversations and team performance | You build itNothing in the channel products attributes an order to a message | IncludedEvery order attributed to the exact message that made the sale |
| Abandoned cart flows | You build them | You build them in code | Built for youFlows live within the first week, copy written in your brand voice |
| Segmentation and A/B testing | Not published | You build it | IncludedAdvanced segmentation and A/B testing on every plan |
| Automation and AI | |||
| Ready made automation builder | IncludedMulti step automation across channels | You build itThe pricing page describes channels and rates, not a visual builder | Flows built for youZefir builds the flows rather than handing you a builder |
| Per customer personalization | Rule driven | You build it | Model drivenDecides what to send, to whom and when from browsing and purchase history |
| Pricing model | |||
| What you are billed for | ConversationsA conversation is any reply within a 7 day window; later replies start a new one | VolumePer message, per minute or per request at a published rate | Messages onlyOne regional rate per message, nothing else metered |
| Platform fee | EUR 299 to EUR 599 per monthEUR 299 annually for 6,000 conversations a year, EUR 499 for 18,000; EUR 349 and EUR 599 on monthly billing | NoneNo platform fee and no per seat charge, per their pricing page | NoneUsage based only, full platform included |
| Features locked behind a commitment | YesMonthly billing costs more and caps harder than annual | None publishedNo features locked behind an annual commit, per their pricing page | NoneEverything included at every volume |
| Cost of the channel working better | RisesEvery reply inside a new 7 day window is another conversation | Rises with sendsVolume based, so more sending costs more | Rises with sends, not with replies |
| Hidden line items to budget for | Overage riskVolume above the conversation allowance is the variable nobody forecasts | Engineering timeThe licence is free and the build is not | No hidden feesPlatform, managed service and unlimited users are all inside the per message rate |
| Team, scale and control | |||
| Users included | Not the metered unit | Not seat based | Unlimited |
| What a dormant list costs you | Nothing until they reply | Nothing until you send | NothingYou pay per message sent, never per contact stored |
| Compliance and support | |||
| Compliance handled for you | Not published | Not published | ManagedTCPA and Meta compliance managed as part of the service |
| Who writes the message copy | You do | You do | Zefir doesFlow copywriting in your brand voice, included |
Weighted scorecard
The weighting below is built for an established ecommerce brand doing seven figures a month. Change the buyer and the ranking changes, so the weights are printed rather than hidden.
Head to head
Trengo charges for the conversations your customers start. MessageBird charges for the volume you send. Only one of those is under your control, and neither tells you what the channel earned.
Trengo defines a conversation as any reply to an inbound or outbound message inside a 7 day window. MessageBird charges per unit sent. The difference shows up the moment a campaign performs.
| Line item | TrengoCustomer engagement | MessageBirdChannels API | ZefirRevenue platform |
|---|---|---|---|
| Platform fee | EUR 299 to EUR 599Per month, depending on billing term | $0No platform fee, no per seat tax | $0 |
| Metered on | Customer replies | Units you send | Messages you send |
| Entry allowance | 6,000 a yearOr 500 a month on the EUR 349 monthly plan | No allowance to exhaustPay per use at published rates | No cap published |
| A campaign that gets 2,000 replies | Consumes a third of the annual allowance | No reply chargeYou pay for what you sent | Priced per message sent |
| What you still have to build | Nothing, it is a finished product | The campaign layer, the reporting and the interface | Nothing, Zefir builds and runs it |
Both are good at something specific. Being clear about that is what makes the rest of this page worth reading.
| Requirement | TrengoCustomer engagement | MessageBirdChannels API | ZefirRevenue platform |
|---|---|---|---|
| A finished inbox on day one | Yes | No | Yes, run for you |
| Five channels behind one contract | Four | Five plus | Two by design |
| No seat fees at all | Yes | Yes | Yes |
| Revenue per order | Not published | Not published | Included |
| Predictable bill for an ecommerce sender | No, replies are metered | Yes, if you model the volume | Yes, spend maps to sends |
The decision
Find the row that sounds like your business. The recommendation is the honest one, not the convenient one.
| Your situation | Pick | Why |
|---|---|---|
| You have engineers and want channels behind one API | MessageBird | Priced by volume, not by seat, with no platform fee and published rates per channel. |
| You run a support desk with predictable inbound volume | Trengo | A finished helpdesk across chat, email and voice with automation included. |
| You need voice and RCS alongside messaging | MessageBird | Voice and RCS are published channels; Trengo covers voice but not RCS. |
| Seven figures a month, WhatsApp and SMS as a revenue line | Zefir | Per order attribution, both channels on one rate, the channel run for you. |
| You have to prove what the channel earned, to the dollar | Zefir | Every order attributed to the exact message that made the sale. Neither of the other two publishes this. |
| Your list is large and mostly dormant | Zefir | You pay per message sent, not per contact stored or per seat. |
| You want the channel live without hiring anyone to run it | Zefir | Setup, flows, templates and copy are built for you, and the channel is live within 72 hours. |
| BFCM is coming and cash flow is tight | Zefir | Post paid billing on a credit line scaled to volume, seasonal peaks included. |
The third option
One sells you a product with the wrong meter. The other sells you an honest meter with no product. Neither answers what an ecommerce operator asks about this channel. Zefir publishes 1,000 plus ecommerce brands on the platform, more than $530M in WhatsApp attributed revenue, and an average revenue increase of 12 to 15 percent measured per order.
Trengo reports on conversations and team performance. MessageBird reports on delivery. Neither publishes attribution from an order back to the message that caused it, so the channel gets judged on response times or delivery rates.
Zefir attributes every order to the exact message that made the sale.
On Trengo a campaign that performs consumes your conversation allowance. On MessageBird the licence is free and the build is not, so the cost moves into engineering time that never appears in a rate comparison.
Zefir charges per message sent and builds the campaign layer for you, so neither cost exists.
The contract starts the day you sign. The revenue starts whenever someone finishes building flows, writing copy and getting templates approved. That gap appears on neither pricing page.
Zefir builds the channel, the flows and the copy, and states 72 hours to live.
If you already picked one
The subscriber list and the consent behind it are the two things that matter. Everything else is rebuildable.
| What moves | Leaving Trengo | Leaving MessageBird | Arriving at Zefir |
|---|---|---|---|
| Subscriber list and consent | Exportable | Exportable | Imported, compliance reviewed |
| WhatsApp number and WABA | Check ownershipConfirm the number is registered to you, not to the provider | Check ownership | Migration handledSetup and templates handled as part of onboarding |
| Message templates | Re approval neededTemplates are approved per provider | Re approval needed | Rewritten and submitted |
| Automations and flows | RebuildNo cross platform format exists | Rebuild | Rebuilt for you |
| Historical reporting | Export before you leave | Export before you leave | Starts freshAttribution begins from the first message sent |
Frequently asked
Zefir connects your store, builds the WhatsApp and SMS channel, and attributes every order to the message that produced it. Live within 72 hours.
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All nine sit on the WhatsApp and SMS comparison hub.