Comparison
Overview
Company snapshot and where each provider is based.
| Field | GMS | SMS.to |
|---|---|---|
| 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. | Omnichannel business messaging platform and API from Cyprus-based Intergo Telecom for sending SMS, Viber, WhatsApp, RCS and Telegram messages worldwide. |
| Founded | 2006 | 2016 |
| Ownership | private | private |
| Employees | 500-1,000 | 51-200 |
| HQ city | Baar | Paphos |
| HQ country | Switzerland | Cyprus (EU) |
What's the differenceSMS.to edges ahead on the overall messaging.dev Score (49 vs 36). GMS is private and headquartered in Baar, Switzerland; SMS.to is private and based in Paphos, Cyprus (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | GMS | SMS.to |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | Yes |
| Facebook Messenger | No | No |
| Telegram | No | Yes |
| Apple Messages for Business | No | No |
| Voice | No | No |
| Yes | No |
What's the differenceThey share 4 channels. GMS additionally offers Email, while SMS.to additionally offers Telegram.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GMS | SMS.to |
|---|---|---|
| Self-service onboarding | No | Yes |
| Free developer credit | No | Free trial credits on sign-up |
| Docs quality | med | med |
| Documentation | Open ↗ | Open ↗ |
| SDKs | iOS (Swift), Android (Kotlin) | PHP |
| Sandbox / test env | No | No |
| API types | REST | REST, SMPP |
What's the differenceSMS.to offers Self-service onboarding, while GMS does not; on SDKs, GMS adds iOS (Swift), Android (Kotlin); SMS.to adds PHP; on API types, SMS.to adds SMPP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GMS | SMS.to |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | Yes |
| Choose region | No | Yes |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | No | No |
| HIPAA | No | No |
What's the differenceSMS.to offers US data residency, while GMS does not; SMS.to offers Choose region, while GMS does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GMS | SMS.to |
|---|---|---|
| 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. | Customer data is retained only while the account remains open; on an account deletion request all data is deleted within 30 days. Customers can choose to have data processed only within the EU, in which case it is not transferred outside the EU; per-message content retention periods are not publicly documented in detail. |
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. SMS.to: Customer data is retained only while the account remains open; on an account deletion request all data is deleted within 30 days. Customers can choose to have data processed only within the EU, in which case it is not transferred outside the EU; per-message content retention periods are not publicly documented in detail.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GMS | SMS.to |
|---|---|---|
| Pricing model | Custom enterprise pricing negotiated with sales; no public self-service or per-message price list. | Prepaid pay-as-you-go credit with no contracts or commitments; per-SMS rates vary by destination and volume discounts are negotiated with sales. |
| SMS starting price | Not published | From $0.023 per SMS (advertised base rate; per-country rates via downloadable price list) |
| Free developer credit | No | Free trial credits on sign-up |
What's the differenceGMS and SMS.to are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GMS | SMS.to |
|---|---|---|
| Countries covered | 0 | 0 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | 99.99% network availability (claimed; no formal SLA published) | No published SLA (public status page at status.sms.to) |
What's the differenceGMS and SMS.to are closely matched on reach & reliability — no material differences in the tracked fields.
Company & Trust
Independent reviews and company profile.
| Field | GMS | SMS.to |
|---|---|---|
| G2 rating | 0.0 | 4.4 |
| G2 reviews | 0 | 4 |
| Ownership | private | private |
| Employees | 500-1,000 | 51-200 |
What's the differenceSMS.to leads on G2 rating (4.4 vs 0 for GMS); SMS.to leads on G2 reviews (4 vs 0 for GMS).
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