Sinch review

Sinch sells communications infrastructure: APIs for businesses and developers that need messaging, voice, email or verification, plus ready-made applications for teams that would rather not build every workflow themselves. Its messaging APIs cover SMS, RCS and WhatsApp. Other offerings include email and voice APIs, identity and security verification, and services for number provisioning and routing.

The application side includes messaging, email campaigns, chatbot building and contact center tools. Sinch also highlights compliance and fraud prevention. That makes it a broad platform rather than a single-purpose SMS tool, but the product mix matters when comparing costs: API services are usage-based, while the listed Engage plans have monthly prices and SMS allowances. We’d check which product and billing model fits the intended use before comparing Sinch’s entry price with another provider’s.

The main draw is breadth. A business can assess messaging, email, voice and verification from one provider, while developers can use APIs and operations teams can consider ready-made applications. Sinch also lists routing, number provisioning, compliance and fraud prevention, which may suit teams with communications needs beyond sending basic texts.

The listed Engage plans give buyers some visible starting points. According to the pricing information, Basics costs $99 per month for one user, 3,000 SMS and three automation workflows, with a free dedicated number. Conversations is $249 per month and includes two users, 10,000 SMS, shared contacts and inbox, role-based access and a mobile app. Higher tiers add SMS capacity and features: Pro is $799 per month for 40,000 SMS, three users, one subaccount, SSO and RCS; Pro Plus is $1,799 for 100,000 SMS, two subaccounts and customer-success onboarding. Advanced is $2,399 for 150,000 SMS and three subaccounts. Functions starts free, per the pricing information, with compute charges based on use.

The headline monthly prices do not tell the whole cost story. API SMS and voice are billed per message or minute, and Functions charges for compute time, but the rates are not published on the vendor's site. That makes it hard to forecast a bill or compare providers without a quote and realistic usage estimates. Sinch Enterprise and the Custom tier also require a sales conversation; Custom is for businesses sending more than 150,000 messages monthly.

The Engage allowances are concrete caps, not unlimited messaging: Basics includes 3,000 SMS, Conversations 10,000, Pro 40,000, Pro Plus 100,000 and Advanced 150,000 per month. Per-message overage rates are not published, so ask what happens when a team exceeds its allowance. Seat counts are also tight on the listed plans: one user on Basics, two on Conversations and three on the higher named tiers. Annual billing is advertised as saving 16%, but annual dollar prices are not published. The pricing information also lists a 14-day trial without specifying which product or plan it covers.

Sinch’s listed Engage plans start at $99 per month for Basics, which includes one user, 3,000 SMS per month, three automation workflows and a dedicated number. Conversations is $249 per month for two users and 10,000 SMS; Pro jumps to $799 for three users and 40,000 SMS. That $550 jump adds SSO, RCS and a subaccount. Pro Plus costs $1,799 for 100,000 SMS, and Advanced is $2,399 for 150,000. Higher-volume customers need a custom quote.

Those are monthly prices. Sinch advertises 16% savings with annual billing, but doesn’t publish annual dollar amounts. The plans include different user, SMS and subaccount limits, so check those caps before comparing tiers. API services are separate: SMS and voice are billed per message or minute, and Functions charges for compute time. Those usage rates aren’t published, making total API costs harder to forecast. Functions starts free; Sinch also offers custom enterprise pricing.

Treat a move to Sinch as an integration project, not just a plan change. First inventory the channels you use, API connections, numbers, routing rules, automations and any applications that depend on them. Sinch offers messaging, voice, email, verification and number-provisioning services, but the published material doesn’t explain migration tools or how to transfer existing numbers, workflows or contact data. Confirm those details with sales before setting a cutover date.

The same caution applies when leaving. Data-export options, formats and account-closure terms aren’t published in the published material, so get them in writing and test what you can retrieve before migrating. API usage charges are also not published, which can make cost a reason to review alternatives, but we can’t say that’s a common reason users leave. The available published material includes no Reddit posts or comments to substantiate reasons for leaving. Check current user discussions and verify each complaint before treating it as a pattern.