Compare OnSync and Trengo on pricing, users, channels, AI, automation, migration, and team fit before choosing the right shared inbox platform.
Choose OnSync if you want a lower-cost Trengo alternative for a small messaging-first team, especially if WhatsApp, Instagram, Facebook, Telegram, AI replies, campaigns, and simple team collaboration are the core workflow. Choose Trengo if you need a broader omnichannel support suite for a larger team, with deeper email, live chat, SMS, voice, and support-process coverage.
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.
| 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.
For many small teams, pricing is the clearest difference between OnSync and Trengo.
OnSync's public pricing is straightforward:
Trengo's public pricing starts higher:
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.
| 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.
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.
OnSync is stronger when a team wants the shared-inbox outcome without taking on a larger support platform too early.
Choose OnSync if:
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.
Trengo is stronger when the company needs a broader omnichannel customer engagement suite and is ready for a larger platform budget.
Choose Trengo if:
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.
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.
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.
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.
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.
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.
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:
For a broader migration framework, see how to migrate from competitors to OnSync.
| 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 |
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.
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.
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.
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.
Yes. OnSync supports Instagram and Facebook messaging workflows so teams can manage social conversations alongside WhatsApp and 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.
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.
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.
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.
See how your team can move from campaigns and scattered replies into one inbox with automation, AI, and clearer reporting.
| Campaign messaging |
| Included by OnSync plan limits |
| Broadcasting is listed as an add-on |
| Shopify/Zapier/API | Available depending on plan | Integrations and API options vary by plan |
| Best workflow | Messaging-led sales, support, automation, and follow-up | Broader omnichannel support and engagement operations |