Comparison
Overview
Company snapshot and where each provider is based.
| Field | GatewayAPI | Twilio |
|---|---|---|
| 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. | Customer engagement platform with communications APIs for SMS, voice, email, and more |
| Founded | 1999 | 2008 |
| Ownership | private | public |
| Employees | 11-50 | 5,000-6,000 |
| HQ city | Odense | San Francisco |
| HQ country | Denmark (EU) | USA |
What's the differenceTwilio edges ahead on the overall messaging.dev Score (88 vs 54). GatewayAPI is private and headquartered in Odense, Denmark (EU); Twilio is public and based in San Francisco, USA.
Channels
Which messaging channels each provider can send and receive on.
| Field | GatewayAPI | Twilio |
|---|---|---|
| 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. Twilio additionally offers MMS, WhatsApp, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GatewayAPI | Twilio |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Test credits on request | $15 trial credit |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | Node.js, Python, PHP, Java, C#, Ruby, Go |
| Sandbox / test env | No | Yes |
| API types | REST, SMPP, Email-to-SMS | REST, SMTP |
What's the differenceOn SDKs, Twilio adds Node.js, Python, PHP, Java, C#, Ruby, Go; Twilio offers Sandbox / test env, while GatewayAPI does not; on API types, GatewayAPI adds SMPP, Email-to-SMS; Twilio adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GatewayAPI | Twilio |
|---|---|---|
| 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 differenceTwilio offers US data residency, while GatewayAPI does not; Twilio offers ISO 27001, while GatewayAPI does not; Twilio offers SOC 2, while GatewayAPI does not; Twilio offers HIPAA, while GatewayAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GatewayAPI | Twilio |
|---|---|---|
| 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. | Twilio stores message and call records by default; customers can enable message body redaction and configure data retention/deletion for message content. Some metadata is retained for a required period for billing and compliance. |
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. Twilio: Twilio stores message and call records by default; customers can enable message body redaction and configure data retention/deletion for message content. Some metadata is retained for a required period for billing and compliance.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GatewayAPI | Twilio |
|---|---|---|
| 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/minute with volume and committed-use discounts |
| SMS starting price | From €0.0061 per SMS (standard class, cheapest destination on the public price list; e.g. €0.0401 to Denmark) | $0.0079 per US SMS segment (plus carrier fees) |
| Free developer credit | Test credits on request | $15 trial credit |
What's the differenceGatewayAPI and Twilio are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GatewayAPI | Twilio |
|---|---|---|
| Countries covered | 200 | 180 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA (99.99%+ historical uptime claimed) | 99.95% (Enterprise Edition) |
What's the differenceGatewayAPI leads on Countries covered (200 vs 180 for Twilio).
Company & Trust
Independent reviews and company profile.
| Field | GatewayAPI | Twilio |
|---|---|---|
| G2 rating | 4.9 | 4.2 |
| G2 reviews | 7 | 700 |
| Ownership | private | public |
| Employees | 11-50 | 5,000-6,000 |
What's the differenceGatewayAPI leads on G2 rating (4.9 vs 4.2 for Twilio); Twilio leads on G2 reviews (700 vs 7 for GatewayAPI).
Still deciding? Read the quickstart guides:
Already on one of them? Follow a migration guide: