You run Klaviyo for email and want to add WhatsApp as a second channel. For that you need a WhatsApp tool that actually talks to Klaviyo: pull segments across, trigger flows from Klaviyo events, attribute revenue cleanly. WhatsApp is now available natively inside Klaviyo too. But the differences between your options are bigger than the feature lists suggest. Here is the honest comparison.
Which is the best WhatsApp tool to use with Klaviyo?
For most DACH e-commerce brands, the best WhatsApp tool to use with Klaviyo is Chatarmin. The integration is bidirectional, meaning segments, properties and events sync both ways. Klaviyo webhooks trigger WhatsApp flows directly, and Meta fees are passed through 1:1 with no markup. charles is the strongest alternative for enterprise setups with a consulting focus. If you only want basic campaigns, Klaviyo's own WhatsApp feature is worth testing, but you pay Klaviyo's own per-message rates rather than raw Meta fees.
Which tool fits which setup?
| Tool | Klaviyo connection | Sync depth | Markup on Meta fees | Best for |
|---|---|---|---|---|
| Chatarmin | Direct (API key), bidirectional | Segments, properties, events, in-flow webhooks, sync back into Klaviyo | No, passed through 1:1 | DACH D2C brands running a Shopify and Klaviyo stack |
| charles | Direct (API key), listed in the Klaviyo App Directory | Real-time data sync, Klaviyo events as triggers, WhatsApp metrics for Klaviyo segments | Variable per-message cost, with markup according to market comparisons | Enterprise brands focused on conversational commerce |
| Klaviyo WhatsApp (native) | No second tool needed | Full Klaviyo data, but limited WhatsApp logic | Klaviyo's own per-message rates (Mobile Messaging), not a 1:1 pass-through | Brands that only want to test basic campaigns |
| Superchat | Via Make or Zapier | Triggers and actions per zap, no direct bidirectional sync | Pricing model with included message allowances | Support teams and local businesses wanting an omnichannel inbox |
| hellomateo | Via Zapier | Klaviyo events as zap triggers for WhatsApp messages | Package pricing by users, channels and phone numbers | Multi-location retail and Mittelstand, less pure e-commerce |
What stands out: only two of the five options offer a direct Klaviyo connection. The rest run through Make or Zapier, or stay inside the Klaviyo universe. Direct here means: connected by API key, with no middleware. Klaviyo's own documentation reserves the word "native" for integrations Klaviyo built itself; all partner tools are listed as third-party apps. Here is why that matters for your setup.
How do you spot a good WhatsApp tool for Klaviyo?
Forget generic feature lists. For the Klaviyo combination, three axes decide it:
1. Sync depth. Can the tool use Klaviyo segments directly as a WhatsApp audience? Does WhatsApp data flow back into the Klaviyo profile? The segments that matter in practice:
- VIP customers with high lifetime value
- Cart abandoners
- Non-openers of your last campaign
A one-way CSV export is not an integration.
2. Abandoned cart handoff. Klaviyo detects the abandonment, the WhatsApp tool sends the message. That only works if Klaviyo events or in-flow webhooks can trigger the WhatsApp tool in real time. Add a Make or Zapier layer in between and you lose the window while the cart is still warm.
3. Revenue attribution between email and WhatsApp. When both channels run in parallel, you need to know which one drives which revenue. Otherwise every monthly report turns into a debate about whether WhatsApp is worth it.
In the DACH market there is a fourth question: GDPR. An EU server location and a properly documented, channel-specific WhatsApp opt-in belong in every tool evaluation. An existing email opt-in from Klaviyo does not cover WhatsApp.
The case for running both is in our WhatsApp benchmark across 382 brands: €96.0M in attributed WhatsApp revenue over twelve months (June 2025 to June 2026), measured across 49.3M campaign messages sent. €45.4M of that ran through automated flows, or 47.3%. WhatsApp performs alongside email as a second channel. Source: Chatarmin WhatsApp Benchmark.
1. Chatarmin: bidirectional Klaviyo sync with no Meta markup
Yes, we rank ourselves first. The three axes above are the reasoning:
Sync depth: The Chatarmin Klaviyo integration runs both ways.
- Klaviyo to Chatarmin: segments, properties, lists and events are available directly in the flow builder, including if/else splits based on Klaviyo data.
- Chatarmin to Klaviyo: opt-in status, collected email addresses and flow data such as postal code or preferences are written back into the Klaviyo profile.
The result: your email list and your WhatsApp list grow at the same time, instead of taking contacts from each other.
Abandoned cart handoff: Klaviyo webhooks and custom events trigger Chatarmin flows directly. The classic setup: email not opened after 48 hours, WhatsApp message follows automatically. No Zapier in between, no delay.
Attribution: revenue tracking per campaign and per flow in the dashboard, comparable to your Klaviyo reports over the same period.
Cost: Chatarmin passes Meta fees through 1:1 (roughly 11 cents per marketing message in Germany, roughly 5 cents in Austria and Switzerland, as of 2026). No platform markup on the message.
The numbers behind it, from the Chatarmin WhatsApp Benchmark:
- 79.0% open rate on a delivered basis
- €1.02 revenue per campaign message
- €2.48 revenue per flow contact
Who we are not right for: running retail locations, a practice or a local business? Then Superchat or hellomateo will serve you better. And if you run an enterprise setup with a dedicated agency team and a conversational commerce strategy, charles deserves a serious look.
2. charles: the official Klaviyo tech partner for enterprise
Credit where it is due: charles has a strong, direct Klaviyo connection and has been listed as a WhatsApp technology partner in the Klaviyo App Directory since May 2025 (source: hello-charles.com). The connection runs on a private API key and covers profile import, opt-in sync and stitching phone numbers to existing Klaviyo profiles (source: hello-charles.com setup docs). The integration syncs zero-party data from WhatsApp into Klaviyo in real time, triggers charles flows from Klaviyo events, and makes WhatsApp engagement metrics such as open and click rates usable for Klaviyo segmentation.
The strengths:
- Deep conversational commerce and in-chat consulting
- Enterprise track record with brands such as WORMLAND (source: hello-charles.com blog)
If you want to sell while the customer is chatting, this is a well-built product.
The trade-offs: charles does not publish a price list. Market estimates put entry at around €349 per month plus variable per-message costs that, according to market comparisons, include a contract-dependent markup on Meta fees (sources: superchat.de comparison article plus our own pricing analysis; no official charles figures). For SMB budgets that is often a size too large.
Best for: enterprise brands with an in-house CRM team that want to run WhatsApp as a consulting and sales channel.
3. Klaviyo WhatsApp: the native feature, honestly assessed
Klaviyo has been able to send WhatsApp itself since 2025 (beta from June 2025, broader availability from autumn 2025). Campaigns and flows run straight out of Klaviyo. It requires the Email and SMS plan plus a Mobile Messaging balance for sending.
The honest upside: one login, one vendor, no second invoice, full Klaviyo segmentation without any sync.
The limits: billing runs through Klaviyo's Mobile Messaging system. You buy a credit package, and each WhatsApp message is charged at Klaviyo's own country rate. How those rates relate to raw Meta fees is not disclosed. By the structure of the pricing, it is not a 1:1 pass-through (source: Klaviyo Help Center, Understand WhatsApp billing, as of Feb 2026). On top of that, the feature covers basic campaigns and simple flows. What is missing is WhatsApp-specific e-commerce logic:
- AI product consulting in chat
- Complex cross-sell flows
- A German-speaking onboarding team
(Based on customer feedback in our Chatarmin vs Klaviyo comparison.)
Best for: brands that want to test WhatsApp with minimal setup effort and can live with basic functionality.
My take: Klaviyo's WhatsApp feature is a good test balloon and a poor end state. Anyone who wants more than basic campaigns after three months will migrate anyway. Better to start with a clean sync.
4. Superchat: omnichannel inbox with Klaviyo via Make or Zapier
Superchat is one of the best-known messaging tools in the DACH market, with more than 9,000 customers according to the company (source: superchat.de). Its strength is the omnichannel inbox: WhatsApp, email, Instagram and other channels in one place, plus AI agents for support.
For the Klaviyo combination, though: the connection runs through Make or Zapier (source: superchat.com/integrationen/klaviyo). Klaviyo events such as abandoned cart or back-in-stock can trigger a WhatsApp message in Superchat, and new Superchat contacts can be created as Klaviyo profiles. It works. But it is an intermediate layer with its own cost, its own failure point and no bidirectional segment sync in real time.
Best for: teams whose main problem is customer support across many channels, and for whom Klaviyo marketing flows are a side stage.
5. hellomateo: Mittelstand platform, Klaviyo via Zapier
hellomateo, based in Potsdam, targets mid-sized companies and multi-location retail with an inbox, a campaign manager and a review manager (source: OMR Reviews). The Klaviyo connection works like Superchat's, through Zapier: Klaviyo as the trigger, WhatsApp message as the action (source: hellomateo.de/integrations/klaviyo).
Packages start at €139 per month (Premium) according to the vendor, tiered by users, channels and phone numbers (as of August 2026). The fit for multi-location teams shows the focus: retail branches, not D2C online shops with large campaign lists.
Best for: local and branch-based businesses. It is not built for a Shopify store with 50,000 Klaviyo contacts.
What do users and review platforms say?
External sources instead of self-praise:
- OMR on Chatarmin: the OMR Reviews content hub on WhatsApp marketing software describes Chatarmin as a fit for "E-Commerce- und Retail-Teams, die WhatsApp als CRM- und Marketing-Kanal skalieren wollen" (e-commerce and retail teams looking to scale WhatsApp as a CRM and marketing channel). Consultant Tim Lamprecht is quoted there saying that anyone thinking about retention, or still doing email only, should give Chatarmin a try. (Source: omr.com content hub; the underlying review is flagged there as more than twelve months old.)
- Full transparency on our own ranking: in that same OMR round-up, Chatarmin sits at number 3, behind Superchat and hellomateo and ahead of charles (ranked by OMR Score, as of February 2026). The OMR ranking measures general user satisfaction across all use cases. This article answers a narrower question: who syncs most deeply with Klaviyo? On that axis we lead, and that is exactly what you can verify in a demo.
- charles: actively cited in the Klaviyo community as a Klaviyo WhatsApp solution, where it positions itself as an integration partner (source: community.klaviyo.com).
- Superchat: describes itself as the highest-rated WhatsApp marketing tool on OMR Reviews (source: superchat.de; vendor claim, not an independent finding).
- Klaviyo: for years, the missing native WhatsApp integration was one of the most-discussed feature requests in the Klaviyo community, until Klaviyo shipped it in 2025 (source: community.klaviyo.com).
Replace, compare or combine?
This article answers exactly one question: which WhatsApp tool complements Klaviyo best. Four related questions are answered elsewhere on purpose:
- Want to replace Klaviyo rather than complement it? Then you are looking for a Klaviyo alternative for email marketing. Different playing field, and we have a dedicated alternatives article for it.
- Want to know how Chatarmin compares to Klaviyo's WhatsApp feature in detail? That head-to-head, with customer feedback and migration story, is in our Chatarmin vs Klaviyo comparison.
- Just need the technical setup of the Klaviyo connection? API key, segments, first flow: our Klaviyo integration page walks through it step by step.
- Curious what Klaviyo itself costs? Active profiles, message rates, hidden cost drivers: all in the Klaviyo pricing article.
Conclusion: combining beats either-or
The most important insight from 532 sales calls that mentioned Klaviyo: nobody wins when you play email against WhatsApp. Klaviyo stays your email tool. The only question is which WhatsApp tool runs next to it.
- Online shop in the DACH market, wanting Klaviyo segments on WhatsApp without an intermediate layer, without a Meta markup and with clean attribution? Chatarmin is the logical choice.
- Enterprise budget and a consulting focus? Take a look at charles.
- Just testing for now? Klaviyo's native feature is a legitimate starting point, though many brands outgrow it.
Try Chatarmin with your Klaviyo account: book a demo and set up your first cross-channel flow. Following up on email non-openers via WhatsApp is the fastest proof of ROI this setup offers.
FAQ: WhatsApp tools and Klaviyo
Which WhatsApp tool works with Klaviyo?
It depends on your setup, but for most DACH e-commerce brands it is Chatarmin: bidirectional sync, Klaviyo webhooks as flow triggers, Meta fees with no markup. charles is the strongest enterprise alternative, while Superchat and hellomateo connect via Make or Zapier.
Can Klaviyo send WhatsApp messages itself?
Yes. Since 2025 Klaviyo has offered its own WhatsApp feature, which requires the Email and SMS plan and bills sending through a Mobile Messaging plan at Klaviyo's own per-message country rates.
Does a WhatsApp tool like Chatarmin replace my Klaviyo?
No. Klaviyo stays your email tool while the WhatsApp tool adds the second channel, syncing contacts, segments and properties automatically.
Will WhatsApp cannibalise my Klaviyo email channel?
No, the opposite. The strongest use case is following up on email non-openers via WhatsApp, and in the Chatarmin benchmark €45.4M in flow revenue ran alongside the existing email marketing of the 382 brands studied.
What does WhatsApp marketing cost on top of Klaviyo?
Meta charges roughly 11 cents per marketing message in Germany and roughly 5 cents in Austria and Switzerland (as of 2026). Chatarmin passes those fees through 1:1, Klaviyo bills its own message rates, and with charles the per-message price depends on your contract.
Is a Zapier connection between Klaviyo and WhatsApp enough?
It depends. For individual notifications yes, but for time-critical flows such as abandoned cart and for bidirectional segment sync, a direct API-key integration is more stable and usually cheaper.
