Comparison
Overview
Company snapshot and where each provider is based.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| 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. | Telnyx is a licensed telecom carrier offering a CPaaS platform with APIs for SMS, MMS, RCS, WhatsApp, voice, and email over its own private global IP network. |
| Founded | 1999 | 2009 |
| Ownership | private | private |
| Employees | 11-50 | 201-500 |
| HQ city | Odense | Chicago |
| HQ country | Denmark (EU) | USA |
What's the differenceTelnyx edges ahead on the overall messaging.dev Score (78 vs 54). GatewayAPI is private and headquartered in Odense, Denmark (EU); Telnyx is private and based in Chicago, USA.
Channels
Which messaging channels each provider can send and receive on.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | Yes |
| RCS | Yes | Yes |
| No | Yes | |
| Viber | No | No |
| Facebook Messenger | No | No |
| Telegram | No | No |
| Apple Messages for Business | No | No |
| Voice | No | Yes |
| Yes | Yes |
What's the differenceThey share 3 channels. Telnyx additionally offers MMS, WhatsApp, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Test credits on request | No |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | Node.js, Python, Ruby, Go, Java, .NET, PHP |
| Sandbox / test env | No | No |
| API types | REST, SMPP, Email-to-SMS | REST, SMPP |
What's the differenceOn SDKs, Telnyx adds Node.js, Python, Ruby, Go, Java, .NET, PHP; on API types, GatewayAPI adds Email-to-SMS.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| 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 differenceTelnyx offers US data residency, while GatewayAPI does not; Telnyx offers ISO 27001, while GatewayAPI does not; Telnyx offers SOC 2, while GatewayAPI does not; Telnyx offers HIPAA, while GatewayAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| 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. | Telnyx follows a "Privacy by Design", minimal data-retention approach with customer-controlled retention policies, so message content and metadata retention can be configured by the customer. Its security-practices documentation states security logs are retained for 90 days; specific default retention periods for message content are not publicly documented in detail. |
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. Telnyx: Telnyx follows a "Privacy by Design", minimal data-retention approach with customer-controlled retention policies, so message content and metadata retention can be configured by the customer. Its security-practices documentation states security logs are retained for 90 days; specific default retention periods for message content are not publicly documented in detail.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| 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 billed per message part, with volume discounts and custom contracts for high-volume customers. |
| SMS starting price | From €0.0061 per SMS (standard class, cheapest destination on the public price list; e.g. €0.0401 to Denmark) | $0.004 per outbound SMS message part (US, plus carrier fees) |
| Free developer credit | Test credits on request | No |
What's the differenceGatewayAPI and Telnyx are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| Countries covered | 200 | 130 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA (99.99%+ historical uptime claimed) | 99.99% (SLA) |
What's the differenceGatewayAPI leads on Countries covered (200 vs 130 for Telnyx).
Company & Trust
Independent reviews and company profile.
| Field | GatewayAPI | Telnyx |
|---|---|---|
| G2 rating | 4.9 | 4.7 |
| G2 reviews | 7 | 525 |
| Ownership | private | private |
| Employees | 11-50 | 201-500 |
What's the differenceGatewayAPI leads on G2 rating (4.9 vs 4.7 for Telnyx); Telnyx leads on G2 reviews (525 vs 7 for GatewayAPI).
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