Comparison
Overview
Company snapshot and where each provider is based.
| Field | Sinch | SMSAPI |
|---|---|---|
| What it is | Cloud communications platform for messaging, voice, and email APIs | A Polish business-messaging platform (a brand of LINK Mobility Poland, part of LINK Mobility Group) offering bulk SMS, MMS, VMS voice, RCS and WhatsApp Business messaging via REST API and a web interface. |
| Founded | 2008 | 2007 |
| Ownership | public | public |
| Employees | 3,000-5,000 | 51-200 |
| HQ city | Stockholm | Gliwice |
| HQ country | Sweden (EU) | Poland (EU) |
What's the differenceSinch edges ahead on the overall messaging.dev Score (92 vs 44). Sinch is public and headquartered in Stockholm, Sweden (EU); SMSAPI is public and based in Gliwice, Poland (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Sinch | SMSAPI |
|---|---|---|
| SMS | Yes | Yes |
| MMS | Yes | Yes |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | No |
| Facebook Messenger | Yes | No |
| Telegram | Yes | No |
| Apple Messages for Business | Yes | No |
| Voice | Yes | Yes |
| Yes | No |
What's the differenceThey share 5 channels. Sinch additionally offers Viber, Facebook Messenger, Telegram, Apple Messages for Business, Email.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Sinch | SMSAPI |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Yes | Free test SMS on signup |
| Docs quality | high | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | Java, Python, C#, Node.js, PHP | PHP, Python, JavaScript, Java, C#, Go, Bash |
| Sandbox / test env | Yes | Yes |
| API types | REST, SMTP, SMPP | REST, SMTP |
What's the differenceOn SDKs, Sinch adds Node.js; SMSAPI adds JavaScript, Go, Bash; on API types, Sinch adds SMPP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Sinch | SMSAPI |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | Yes | No |
| Choose region | Yes | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | Yes | No |
| HIPAA | Yes | No |
What's the differenceSinch offers US data residency, while SMSAPI does not; Sinch offers Choose region, while SMSAPI does not; Sinch offers SOC 2, while SMSAPI does not; Sinch offers HIPAA, while SMSAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Sinch | SMSAPI |
|---|---|---|
| Retention policy | Sinch retains message and delivery records to provide the service and meet legal obligations; retention windows for message content are limited and, for some products, configurable via data-processing agreements. | Messages are stored in accordance with applicable law and disclosed only when required by a lawful request; phone numbers are used solely for SMS campaign purposes. No specific retention period is publicly documented. All data is held within the EEA on two redundant data centers in Poland (ATMAN and T-Mobile, over 150 km apart). |
What's the differenceSinch: Sinch retains message and delivery records to provide the service and meet legal obligations; retention windows for message content are limited and, for some products, configurable via data-processing agreements. SMSAPI: Messages are stored in accordance with applicable law and disclosed only when required by a lawful request; phone numbers are used solely for SMS campaign purposes. No specific retention period is publicly documented. All data is held within the EEA on two redundant data centers in Poland (ATMAN and T-Mobile, over 150 km apart).
Pricing & Credits
Pricing model and the cost of a first message.
| Field | Sinch | SMSAPI |
|---|---|---|
| Pricing model | Pay-as-you-go per message with volume and committed-use pricing | Pay-as-you-go prepaid credit — pay only for sent messages with no setup fee or contract; minimum top-up around €30. |
| SMS starting price | Approx. $0.0075 per US SMS segment (varies by volume; plus carrier fees) | From ~€0.04 per SMS (international, varies by destination country) |
| Free developer credit | Yes | Free test SMS on signup |
What's the differenceSinch and SMSAPI are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Sinch | SMSAPI |
|---|---|---|
| Countries covered | 150 | 0 |
| Direct operator connections | Yes | No |
| Published uptime SLA | 99.95% | No published SLA |
What's the differenceSinch leads on Countries covered (150 vs 0 for SMSAPI); Sinch offers Direct operator connections, while SMSAPI does not.
Company & Trust
Independent reviews and company profile.
| Field | Sinch | SMSAPI |
|---|---|---|
| G2 rating | 4.3 | 0.0 |
| G2 reviews | 150 | 0 |
| Ownership | public | public |
| Employees | 3,000-5,000 | 51-200 |
What's the differenceSinch leads on G2 rating (4.3 vs 0 for SMSAPI); Sinch leads on G2 reviews (150 vs 0 for SMSAPI).
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