Trengo Alternative for WhatsApp Teams? Here's How OnSync Compares

If you are comparing OnSync vs Trengo, you are probably not just asking which product has a shared inbox. You are asking which platform gives your team the right mix of WhatsApp, Instagram, Facebook, Telegram, AI, automation, and team collaboration without forcing you into a larger operating model too early.

This comparison is written for founders, operators, agencies, ecommerce teams, and small customer-facing teams that need to centralize messaging but still care about monthly cost, setup speed, and day-to-day simplicity.

OnSync vs Trengo at a glance

Category	OnSync	Trengo	What it means
Best fit	Small messaging-first teams, founders, agencies, ecommerce teams, and sales/support teams using WhatsApp plus social channels	Larger support and customer engagement teams that want a broader omnichannel suite	OnSync is leaner for small teams; Trengo is broader for larger operations.
Starting public price	Solo at $29/month; Team at $59/month; Business at $129/month	Boost from EUR 299/month annually or EUR 349 month-to-month	OnSync has a much lower entry price for teams that do not need Trengo's larger plan structure.
Included users	1 user on Solo, up to 5 on Team, up to 15 on Business	10 users on Boost, 20 users on Pro	Trengo includes more users in the base package, but the package starts at a higher price.
Messaging channels	WhatsApp, Instagram, Facebook, and Telegram	Email, WhatsApp, Instagram, Facebook, live chat, SMS, and more	Trengo covers more traditional support channels; OnSync focuses on modern messaging channels.
WhatsApp Business API	Included as a core workflow	Included	Both can work for WhatsApp-led teams. Compare setup, routing, and total cost.
AI and automation	AI writing, chatbots, routing, campaigns, and automation depending on plan	AI Agent, AI Journeys, auto replies, quick replies, and AI-related usage rules	Compare not only whether AI exists, but whether it is included in the plan you will actually buy.
Campaigns and broadcasts	Campaign messages included by plan	Broadcasting is listed as an add-on on Trengo pricing	This matters for teams that send proactive WhatsApp or social messaging campaigns.
Setup style	Designed for quick rollout by small teams	More complete suite with more configuration decisions	OnSync is usually simpler to adopt; Trengo can fit teams with more formal support processes.
Pricing model	Simple tiered plans by team size and capability	Plan price plus conversation allowances, add-on conversations, extra users, and AI surcharge rules	Trengo's model may be fair for larger teams, but small teams should model usage carefully.

Pricing and packaging change, so confirm the latest numbers on the official OnSync pricing page and Trengo pricing page before buying. This page was reviewed on April 29, 2026.

Pricing comparison: where the decision often starts

For many small teams, pricing is the clearest difference between OnSync and Trengo.

OnSync's public pricing is straightforward:

Solo: $29/month for individual users and freelancers.
Team: $59/month for up to 5 team members.
Business: $129/month for up to 15 team members.

Trengo's public pricing starts higher:

Boost: EUR 299/month when billed annually, or EUR 349 month-to-month, with 10 users included.
Pro: EUR 499/month when billed annually, or EUR 599 month-to-month, with 20 users included.
Enterprise: custom pricing.

Trengo also lists conversation allowances and add-ons. Its pricing page describes 6,000 conversations/year or 500 conversations/month on Boost, 18,000 conversations/year or 1,500 conversations/month on Pro, add-on conversations, extra user pricing, and AI surcharge rules for some usage.

That does not make Trengo "bad" pricing. It means Trengo is packaged for teams that expect a broader customer engagement platform. But if you are a 2-5 person team mainly trying to centralize WhatsApp, Instagram, Facebook, Telegram, and AI-assisted replies, OnSync can reach the core outcome at a much lower starting cost.

Cost examples for small teams

Scenario	OnSync plan to evaluate	Trengo plan to evaluate	Likely decision lens
Solo founder handling WhatsApp and Instagram leads	Solo at $29/month	Boost at EUR 299/month annually or EUR 349 month-to-month	OnSync is usually the more practical starting point.
3-person sales/support team	Team at $59/month	Boost with 10 users included	Trengo includes more seats, but OnSync may be enough if you only need a compact messaging workflow.
8-10 person operation	Business at $129/month	Boost or Pro depending on conversations and features	Compare channel needs, usage limits, and automation requirements carefully.
Larger support team with email, live chat, SMS, and support reporting	Business or custom OnSync discussion	Pro or Enterprise	Trengo may be the better shortlist option if those broader support channels matter.

The important calculation is total cost of ownership, not just the list price. Include users, conversations, campaign volume, AI usage, support needs, implementation time, and any second tool you would need to cover missing channels.

For a broader cost model, see OnSync's messaging platform pricing guide.

Feature comparison: shared inbox, channels, AI, and automation

Both platforms help teams manage customer conversations, but they are built with different centers of gravity.

OnSync is built around messaging channels that many small businesses already depend on: WhatsApp, Instagram, Facebook, and Telegram. The core use case is giving a team one place to respond, assign, automate, and follow up without building a heavy support stack first.

Trengo is broader. It positions itself as an omnichannel customer engagement platform, covering email, WhatsApp, Instagram, Facebook Messenger, live chat, SMS, and other channels. That breadth is useful for teams that already run a formal customer support operation across many touchpoints.

Feature area	OnSync	Trengo
Shared team inbox	Yes, with team collaboration and assignment workflows	Yes, with unified inbox and team collaboration
WhatsApp Business API	Yes	Yes
Instagram and Facebook messaging	Yes	Yes
Telegram	Yes	Not the main public pricing emphasis
Email support inbox	Not the core product focus	Yes
Website live chat/widget	Not the core product focus	Yes
SMS and voice	Not the core product focus	SMS and voice options are part of Trengo's broader ecosystem and add-ons
AI replies and AI assistance	Included across OnSync's AI and chatbot workflows depending on plan	AI Agent, AI Journeys, and AI surcharge rules depending on usage

If your daily problem is "customers message us on WhatsApp and social channels, and our team needs one accountable workflow," OnSync is the more focused fit. If your daily problem is "we need a full support center across email, web chat, SMS, WhatsApp, and reporting," Trengo deserves a serious look.

Where OnSync is stronger

OnSync is stronger when a team wants the shared-inbox outcome without taking on a larger support platform too early.

Choose OnSync if:

You are a 1-15 person team and want pricing that scales from solo to team to business plans.
WhatsApp is the main customer conversation channel, but Instagram, Facebook, and Telegram also matter.
You want AI replies, chatbot assistance, and automations connected to the same messaging workflow.
You need campaign messaging but do not want broadcasting to become a separate add-on decision from day one.
You want a faster rollout for a small team that does not have a dedicated support operations manager.
You care more about practical adoption than a long feature checklist.

OnSync is especially relevant for businesses that already think in terms of conversations, leads, bookings, orders, and follow-ups. If that is your workflow, review the shared inbox, WhatsApp Business API, WhatsApp CRM, Instagram automation, and Telegram for business pages before deciding.

Where Trengo is stronger

Trengo is stronger when the company needs a broader omnichannel customer engagement suite and is ready for a larger platform budget.

Choose Trengo if:

Your support operation is already spread across email, live chat, SMS, WhatsApp, Instagram, and Facebook.
You want more users included in the entry package and the monthly starting price is acceptable.
Your team needs formal support workflows, saved views, conversation outcomes, larger reporting needs, and broader channel coverage.
You are comfortable modeling conversation allowances, extra users, add-ons, and AI-related usage costs.
You want a platform that can grow into more enterprise-style customer engagement operations.

That is why a fair OnSync vs Trengo comparison should not pretend both tools are identical. OnSync is a leaner Trengo alternative for small messaging teams. Trengo is a wider customer engagement suite for teams that need that breadth.

Which platform fits your team?

Solo founder or freelancer

OnSync is usually the better starting point. A solo operator probably does not need a 10-user package or a broad support suite. They need a simple way to manage WhatsApp and social messages, reply faster, and avoid missed leads.

2-5 person sales or support team

OnSync is still the stronger default if the team is messaging-led. The Team plan gives small teams a lower-cost way to collaborate without adopting a bigger workflow model too early.

Trengo can make sense here if the team already relies on email and website chat as much as WhatsApp and social messaging.

Ecommerce team

The decision depends on the channels that drive revenue. If most order questions, abandoned cart follow-ups, and customer replies happen through WhatsApp and social DMs, OnSync is a cleaner fit. If the operation also depends heavily on email tickets, website chat, SMS, and larger support reporting, Trengo may fit better.

For ecommerce-specific messaging, also review OnSync's ecommerce messaging cluster and ecommerce automation page.

Agency managing client messages

OnSync can be a practical choice for agencies that need to manage WhatsApp, Instagram, Facebook, and Telegram conversations without giving every client a heavy customer support platform. The simpler plan structure helps when you are standardizing a repeatable operating model.

Trengo may be better if the agency is operating full customer service desks for clients across email, chat, SMS, and social channels.

Mature support organization

Trengo is more likely to belong on the shortlist when the operation is already large, multi-channel, and process-heavy. At that stage, a higher base price can be reasonable if it replaces several tools and gives the support team the channel coverage it needs.

Migration from Trengo to OnSync

If you are already using Trengo and want to evaluate OnSync, do not migrate everything at once. Start with the channel and workflow that creates the most pressure.

Use this checklist:

Export or document key contacts, tags, inboxes, conversation views, and assignment rules.
Identify which channels must go live first: WhatsApp, Instagram, Facebook, or Telegram.
Recreate team roles, inbox ownership, and escalation paths inside OnSync.
Rebuild the highest-volume quick replies, chatbot flows, and routing automations.
Review WhatsApp template and campaign needs before moving proactive messaging.
Connect Shopify, Zapier, API, or webhook workflows only after the inbox is stable.
Train the team on ownership rules, response standards, and when to hand off from AI to a human.
Run both platforms in parallel for a short test window before fully switching.

For a broader migration framework, see how to migrate from competitors to OnSync.

Decision matrix

If this matters most	Better fit
Lowest practical starting cost	OnSync
WhatsApp-led team inbox	OnSync
Instagram, Facebook, and Telegram in the same messaging workflow	OnSync
Broader email, live chat, SMS, and support suite coverage	Trengo
Larger support team with formal customer engagement operations	Trengo
Simple rollout for a small team	OnSync
More users included in the entry package	Trengo
Predictable small-team plan structure	OnSync
Deep omnichannel support desk	Trengo

Final verdict

OnSync is the better Trengo alternative for small teams that want a focused, affordable messaging platform around WhatsApp, Instagram, Facebook, Telegram, AI, campaigns, and team collaboration. It is not trying to be the biggest support suite in the category; it is trying to give smaller teams the messaging workflow they actually need without the cost and configuration weight of a larger platform.

Trengo is the better choice when the buyer needs a broader omnichannel customer engagement platform, has more agents, uses email and live chat heavily, and is comfortable with higher starting prices plus conversation and add-on modeling.

For most small messaging-first teams, start with OnSync. For larger omnichannel support teams, compare Trengo seriously.

Related comparisons and guides

Frequently asked questions

Is OnSync a Trengo alternative?

Yes. OnSync is a Trengo alternative for teams that want a shared inbox, WhatsApp Business API support, social messaging, Telegram, AI assistance, campaigns, and automation in a simpler small-team package.

Is OnSync cheaper than Trengo?

Based on public pricing reviewed on April 29, 2026, OnSync has a lower starting price. OnSync starts at $29/month for Solo, while Trengo's Boost plan starts at EUR 299/month when billed annually or EUR 349 month-to-month. Confirm current pricing on both official pricing pages before buying.

Does OnSync support WhatsApp Business API?

Yes. WhatsApp Business API is one of OnSync's core product areas. Teams can use OnSync to manage WhatsApp conversations alongside team inbox, automation, AI, and customer context workflows.

Does OnSync support Instagram and Facebook messages?

Yes. OnSync supports Instagram and Facebook messaging workflows so teams can manage social conversations alongside WhatsApp and Telegram.

Does OnSync support Telegram?

Yes. OnSync includes Telegram for business messaging, which is useful for teams whose customer conversations are spread across more than WhatsApp and Meta channels.

When should I choose Trengo instead of OnSync?

Choose Trengo if you need a broader omnichannel support suite with email, live chat, SMS, WhatsApp, Instagram, Facebook, larger support workflows, and a pricing model built for bigger teams.

Can I migrate from Trengo to OnSync?

Yes. Start by moving the highest-value messaging channels first, then recreate inboxes, assignment rules, quick replies, automations, and integrations. Run a short parallel test before fully switching.

Which is better for a small team?

OnSync is usually the better fit for a small team if the main workflow is WhatsApp and social messaging. Trengo can be better if the small team also needs a fuller support suite across email, website chat, SMS, and more formal customer service workflows.