Comparison
Overview
Company snapshot and where each provider is based.
| Field | GMS | SMSAPI |
|---|---|---|
| What it is | Enterprise CPaaS and A2P messaging provider offering SMS, WhatsApp, Viber, RCS and email through a single API, plus messaging-hub and SMS-firewall services for mobile network operators. | 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 | 2006 | 2007 |
| Ownership | private | public |
| Employees | 500-1,000 | 51-200 |
| HQ city | Baar | Gliwice |
| HQ country | Switzerland | Poland (EU) |
What's the differenceSMSAPI edges ahead on the overall messaging.dev Score (44 vs 36). GMS is private and headquartered in Baar, Switzerland; SMSAPI is public and based in Gliwice, Poland (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | GMS | SMSAPI |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | Yes |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | No |
| Facebook Messenger | No | No |
| Telegram | No | No |
| Apple Messages for Business | No | No |
| Voice | No | Yes |
| Yes | No |
What's the differenceThey share 3 channels. GMS additionally offers Viber, Email, while SMSAPI additionally offers MMS, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GMS | SMSAPI |
|---|---|---|
| Self-service onboarding | No | Yes |
| Free developer credit | No | Free test SMS on signup |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | iOS (Swift), Android (Kotlin) | PHP, Python, JavaScript, Java, C#, Go, Bash |
| Sandbox / test env | No | Yes |
| API types | REST | REST, SMTP |
What's the differenceSMSAPI offers Self-service onboarding, while GMS does not; on SDKs, GMS adds iOS (Swift), Android (Kotlin); SMSAPI adds PHP, Python, JavaScript, Java, C#, Go, Bash; SMSAPI offers Sandbox / test env, while GMS does not; on API types, SMSAPI adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GMS | SMSAPI |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | No | No |
| HIPAA | No | No |
What's the differenceGMS and SMSAPI are closely matched on data & compliance — no material differences in the tracked fields.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GMS | SMSAPI |
|---|---|---|
| Retention policy | Not publicly documented in detail. GMS's privacy notice states personal data is processed under EU GDPR (Regulation (EU) 2016/679) and held at its Switzerland headquarters (recognized by the European Commission as providing an adequate level of data protection); no specific retention periods for message content or metadata are published. GMS also holds ISO/IEC 27701 (privacy information management) certification. | 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 differenceGMS: Not publicly documented in detail. GMS's privacy notice states personal data is processed under EU GDPR (Regulation (EU) 2016/679) and held at its Switzerland headquarters (recognized by the European Commission as providing an adequate level of data protection); no specific retention periods for message content or metadata are published. GMS also holds ISO/IEC 27701 (privacy information management) certification. 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 | GMS | SMSAPI |
|---|---|---|
| Pricing model | Custom enterprise pricing negotiated with sales; no public self-service or per-message price list. | 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 | Not published | From ~€0.04 per SMS (international, varies by destination country) |
| Free developer credit | No | Free test SMS on signup |
What's the differenceGMS and SMSAPI are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GMS | SMSAPI |
|---|---|---|
| Countries covered | 0 | 0 |
| Direct operator connections | Yes | No |
| Published uptime SLA | 99.99% network availability (claimed; no formal SLA published) | No published SLA |
What's the differenceGMS offers Direct operator connections, while SMSAPI does not.
Company & Trust
Independent reviews and company profile.
| Field | GMS | SMSAPI |
|---|---|---|
| G2 rating | 0.0 | 0.0 |
| G2 reviews | 0 | 0 |
| Ownership | private | public |
| Employees | 500-1,000 | 51-200 |
What's the differenceGMS and SMSAPI are closely matched on company & trust — no material differences in the tracked fields.
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