Comparison
Overview
Company snapshot and where each provider is based.
| Field | Attentive | SMS.to |
|---|---|---|
| What it is | AI-powered SMS, MMS, RCS, email, and push marketing platform for consumer brands, with REST and GraphQL APIs for subscriber management and event-triggered messaging rather than direct message sending. | Omnichannel business messaging platform and API from Cyprus-based Intergo Telecom for sending SMS, Viber, WhatsApp, RCS and Telegram messages worldwide. |
| Founded | 2016 | 2016 |
| Ownership | private | private |
| Employees | 1,000-1,500 | 51-200 |
| HQ city | New York | Paphos |
| HQ country | USA | Cyprus (EU) |
What's the differenceSMS.to edges ahead on the overall messaging.dev Score (49 vs 40). Attentive is private and headquartered in New York, USA; SMS.to is private and based in Paphos, Cyprus (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Attentive | SMS.to |
|---|---|---|
| SMS | Yes | Yes |
| MMS | Yes | No |
| RCS | Yes | Yes |
| No | Yes | |
| Viber | No | Yes |
| Facebook Messenger | No | No |
| Telegram | No | Yes |
| Apple Messages for Business | No | No |
| Voice | No | No |
| Yes | No |
What's the differenceThey share 2 channels. Attentive additionally offers MMS, Email, while SMS.to additionally offers WhatsApp, Viber, Telegram.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Attentive | 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), React Native | PHP |
| Sandbox / test env | Yes | No |
| API types | REST, GraphQL | REST, SMPP |
What's the differenceSMS.to offers Self-service onboarding, while Attentive does not; on SDKs, Attentive adds iOS (Swift), Android (Kotlin), React Native; SMS.to adds PHP; Attentive offers Sandbox / test env, while SMS.to does not; on API types, Attentive adds GraphQL; SMS.to adds SMPP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Attentive | SMS.to |
|---|---|---|
| EU data residency | No | Yes |
| US data residency | Yes | Yes |
| Choose region | No | Yes |
| GDPR | Yes | Yes |
| ISO 27001 | No | Yes |
| SOC 2 | Yes | No |
| HIPAA | No | No |
What's the differenceSMS.to offers EU data residency, while Attentive does not; SMS.to offers Choose region, while Attentive does not; SMS.to offers ISO 27001, while Attentive does not; Attentive offers SOC 2, while SMS.to does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Attentive | SMS.to |
|---|---|---|
| Retention policy | No fixed retention periods are published; the privacy policy states personal information is retained "for as long as necessary to provide our Service or as needed to comply with applicable legal obligations." EU/UK/Swiss consumer data is transferred to and processed in the United States under the EU-U.S., UK Extension, and Swiss-U.S. Data Privacy Frameworks. | 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 differenceAttentive: No fixed retention periods are published; the privacy policy states personal information is retained "for as long as necessary to provide our Service or as needed to comply with applicable legal obligations." EU/UK/Swiss consumer data is transferred to and processed in the United States under the EU-U.S., UK Extension, and Swiss-U.S. Data Privacy Frameworks. 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 | Attentive | SMS.to |
|---|---|---|
| Pricing model | Custom-quoted, usage-based subscription priced on message volume, subscriber list size, channels, and premium AI add-ons; no self-serve signup or published per-message rates. | 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 differenceAttentive and SMS.to are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Attentive | SMS.to |
|---|---|---|
| Countries covered | 20 | 0 |
| Direct operator connections | No | Yes |
| Published uptime SLA | No published SLA | No published SLA (public status page at status.sms.to) |
What's the differenceAttentive leads on Countries covered (20 vs 0 for SMS.to); SMS.to offers Direct operator connections, while Attentive does not.
Company & Trust
Independent reviews and company profile.
| Field | Attentive | SMS.to |
|---|---|---|
| G2 rating | 4.5 | 4.4 |
| G2 reviews | 1,483 | 4 |
| Ownership | private | private |
| Employees | 1,000-1,500 | 51-200 |
What's the differenceAttentive leads on G2 rating (4.5 vs 4.4 for SMS.to); Attentive leads on G2 reviews (1,483 vs 4 for SMS.to).
Still deciding? Read the quickstart guides: