Comparison
Overview
Company snapshot and where each provider is based.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| 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. | 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 | 1999 | 2007 |
| Ownership | private | public |
| Employees | 11-50 | 51-200 |
| HQ city | Odense | Gliwice |
| HQ country | Denmark (EU) | Poland (EU) |
What's the differenceGatewayAPI edges ahead on the overall messaging.dev Score (54 vs 44). GatewayAPI is private and headquartered in Odense, Denmark (EU); SMSAPI is public and based in Gliwice, Poland (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| 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 | No |
What's the differenceThey share 2 channels. GatewayAPI additionally offers Email, while SMSAPI additionally offers MMS, WhatsApp, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Test credits on request | Free test SMS on signup |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | PHP, Python, JavaScript, Java, C#, Go, Bash |
| Sandbox / test env | No | Yes |
| API types | REST, SMPP, Email-to-SMS | REST, SMTP |
What's the differenceOn SDKs, SMSAPI adds PHP, Python, JavaScript, Java, C#, Go, Bash; SMSAPI offers Sandbox / test env, while GatewayAPI does not; on API types, GatewayAPI adds SMPP, Email-to-SMS; SMSAPI adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | Yes | No |
| GDPR | Yes | Yes |
| ISO 27001 | No | Yes |
| SOC 2 | No | No |
| HIPAA | No | No |
What's the differenceGatewayAPI offers Choose region, while SMSAPI does not; SMSAPI offers ISO 27001, while GatewayAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| 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. | 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 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. 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 | GatewayAPI | SMSAPI |
|---|---|---|
| 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 prepaid credit — pay only for sent messages with no setup fee or contract; minimum top-up around €30. |
| SMS starting price | From €0.0061 per SMS (standard class, cheapest destination on the public price list; e.g. €0.0401 to Denmark) | From ~€0.04 per SMS (international, varies by destination country) |
| Free developer credit | Test credits on request | Free test SMS on signup |
What's the differenceGatewayAPI and SMSAPI are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| Countries covered | 200 | 0 |
| Direct operator connections | Yes | No |
| Published uptime SLA | No published SLA (99.99%+ historical uptime claimed) | No published SLA |
What's the differenceGatewayAPI leads on Countries covered (200 vs 0 for SMSAPI); GatewayAPI offers Direct operator connections, while SMSAPI does not.
Company & Trust
Independent reviews and company profile.
| Field | GatewayAPI | SMSAPI |
|---|---|---|
| G2 rating | 4.9 | 0.0 |
| G2 reviews | 7 | 0 |
| Ownership | private | public |
| Employees | 11-50 | 51-200 |
What's the differenceGatewayAPI leads on G2 rating (4.9 vs 0 for SMSAPI); GatewayAPI leads on G2 reviews (7 vs 0 for SMSAPI).
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