Comparison
Overview
Company snapshot and where each provider is based.
| Field | GatewayAPI | Sinch |
|---|---|---|
| What it is | Danish SMS gateway and messaging platform by ONLINECITY.IO offering SMS, RCS and email APIs with pay-as-you-go pricing and EU data hosting. | Cloud communications platform for messaging, voice, and email APIs |
| Founded | 1999 | 2008 |
| Ownership | private | public |
| Employees | 11-50 | 3,000-5,000 |
| HQ city | Odense | Stockholm |
| HQ country | Denmark (EU) | Sweden (EU) |
What's the differenceSinch edges ahead on the overall messaging.dev Score (92 vs 54). GatewayAPI is private and headquartered in Odense, Denmark (EU); Sinch is public and based in Stockholm, Sweden (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | GatewayAPI | Sinch |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | Yes |
| RCS | Yes | Yes |
| No | Yes | |
| Viber | No | Yes |
| Facebook Messenger | No | Yes |
| Telegram | No | Yes |
| Apple Messages for Business | No | Yes |
| Voice | No | Yes |
| Yes | Yes |
What's the differenceThey share 3 channels. Sinch additionally offers MMS, WhatsApp, Viber, Facebook Messenger, Telegram, Apple Messages for Business, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GatewayAPI | Sinch |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Test credits on request | Yes |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | Java, Python, C#, Node.js, PHP |
| Sandbox / test env | No | Yes |
| API types | REST, SMPP, Email-to-SMS | REST, SMTP, SMPP |
What's the differenceOn SDKs, Sinch adds Java, Python, C#, Node.js, PHP; Sinch offers Sandbox / test env, while GatewayAPI does not; on API types, GatewayAPI adds Email-to-SMS; Sinch adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GatewayAPI | Sinch |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | Yes |
| Choose region | Yes | Yes |
| GDPR | Yes | Yes |
| ISO 27001 | No | Yes |
| SOC 2 | No | Yes |
| HIPAA | No | Yes |
What's the differenceSinch offers US data residency, while GatewayAPI does not; Sinch offers ISO 27001, while GatewayAPI does not; Sinch offers SOC 2, while GatewayAPI does not; Sinch offers HIPAA, while GatewayAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GatewayAPI | Sinch |
|---|---|---|
| Retention policy | Message content, sender and recipient are stored in the traffic log for 30 days, after which records are anonymized (message content and full sender deleted, last half of the recipient number removed). An optional "secret" message class skips storage of content, sender and recipient entirely. | 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. |
What's the differenceGatewayAPI: Message content, sender and recipient are stored in the traffic log for 30 days, after which records are anonymized (message content and full sender deleted, last half of the recipient number removed). An optional "secret" message class skips storage of content, sender and recipient entirely. Sinch: 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.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GatewayAPI | Sinch |
|---|---|---|
| Pricing model | Pay-as-you-go per-message pricing with prepaid credit; no monthly subscriptions or fees (except short-code countries), with negotiated discounts for high volumes. | Pay-as-you-go per message with volume and committed-use pricing |
| SMS starting price | From €0.0061 per SMS (standard class, cheapest destination on the public price list; e.g. €0.0401 to Denmark) | Approx. $0.0075 per US SMS segment (varies by volume; plus carrier fees) |
| Free developer credit | Test credits on request | Yes |
What's the differenceGatewayAPI and Sinch are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GatewayAPI | Sinch |
|---|---|---|
| Countries covered | 200 | 150 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA (99.99%+ historical uptime claimed) | 99.95% |
What's the differenceGatewayAPI leads on Countries covered (200 vs 150 for Sinch).
Company & Trust
Independent reviews and company profile.
| Field | GatewayAPI | Sinch |
|---|---|---|
| G2 rating | 4.9 | 4.3 |
| G2 reviews | 7 | 150 |
| Ownership | private | public |
| Employees | 11-50 | 3,000-5,000 |
What's the differenceGatewayAPI leads on G2 rating (4.9 vs 4.3 for Sinch); Sinch leads on G2 reviews (150 vs 7 for GatewayAPI).
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