Dean S.
Extremely poor customer service and…
Extremely poor customer service and support. Everything is fine until something goes wrong, and it can take days if not weeks to fix. This is not ideal if you rely on this service as part of a business.

Sinch provides the global communications infrastructure businesses rely on to engage customers across messaging, voice, email, verification, and more. For nearly two decades, Sinch has powered the world's most critical customer communications, bringing together SMS, RCS, MMS, WhatsApp, voice, and email into one platform used by more than 200,000 businesses, including 8 of the 10 largest U.S. tech companies.Through an open ecosystem of APIs, applications, integrations, and AI platforms, customers can connect and scale communications in the way that works best for them, using Sinch's own Agent Tools (MCP, Functions, Skills), integrating existing technology, or bringing their own AI and partner platforms.Sinch's infrastructure is built for global scale and reliability: 600+ direct carrier and operator connections, 160 million-plus active phone numbers, and 99.99% uptime, backed by ISO 27001, ISO 9001, PCI DSS, and SOC I and II certification, GDPR and HIPAA compliance, and MEF Code of Conduct approval.We meet businesses where they are, whether they want to build with Sinch APIs, co-create using our tools and integrations, or buy ready-made outcomes, supported by flexible onboarding, dedicated customer success, and support models that help them accelerate time to value.Recognized as a Leader in the 2026 Gartner Magic Quadrant for CPaaS and the IDC MarketScape for Communications Engagement Platforms, Sinch is trusted by brands like Adobe, Uber, HSBC, and American Express, at more than 1 trillion customer interactions a year.
Sinch (sinch.com) has 30 customer reviews on Five Star Index, with an average rating of 1.3 out of 5.
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Excellent

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30 approved reviews, newest moderated first
Dean S.
Extremely poor customer service and support. Everything is fine until something goes wrong, and it can take days if not weeks to fix. This is not ideal if you rely on this service as part of a business.
Martin O.
I actually applied for a job at Sinch because it sounded like the company could be fun to work for. After a first call with the acquisition specialist, I was told that the next step was an assignment that should take about 3 hours, which would be used to determine whether I would proceed to the formal interview. I was skeptical, but reluctantly agreed. When I received the assignment I was frankly shocked at the poor quality of it. So I emailed my contact and explained why I found the assignment to be contrary to principles of inclusion in light of my experience as a neurodivergent person, and how it was asking a lot from candidates with no reciprocating gestures. The response was bad. Refusal to listen, responding to irrelevancies instead of the point, and straight up gaslighting. I kept reiterating that I'd be happy to do the assignment over a call, as the job involves collaboration throughout anyway, but this was constantly ignored, with the acquisition person repeatedly trying to exclude me by replying as if I'd simply refused to continue the process. I hope that the issue was more the person I was dealing with and less the company, but my experience is with them as a representative of Sinch, and as such my review has to reflect that.
Osho S.
They don't give refunds, careful people, they block your account marked as "suspicious activity" and never see your money again. And the support is so SLOW.
Trijah M.
The quality and detail in design is unmatched, and the functionality doesn't fall far behind this. Sinch has been a big factor in motivating my grandparents to enjoy the outdoors again, something close not possible before E-Bikes. Thanks Sinch!
ACROM S.
you have a bad company assistance
Lisa S.
We use Sinch for internal projects