Comparison
Overview
Company snapshot and where each provider is based.
| Field | Attentive | SMSAPI |
|---|---|---|
| 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. | 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 | 2016 | 2007 |
| Ownership | private | public |
| Employees | 1,000-1,500 | 51-200 |
| HQ city | New York | Gliwice |
| HQ country | USA | Poland (EU) |
What's the differenceSMSAPI edges ahead on the overall messaging.dev Score (44 vs 40). Attentive is private and headquartered in New York, USA; SMSAPI is public and based in Gliwice, Poland (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Attentive | SMSAPI |
|---|---|---|
| SMS | Yes | Yes |
| MMS | Yes | 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 3 channels. Attentive additionally offers Email, while SMSAPI additionally offers WhatsApp, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Attentive | 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), React Native | PHP, Python, JavaScript, Java, C#, Go, Bash |
| Sandbox / test env | Yes | Yes |
| API types | REST, GraphQL | REST, SMTP |
What's the differenceSMSAPI offers Self-service onboarding, while Attentive does not; on SDKs, Attentive adds iOS (Swift), Android (Kotlin), React Native; SMSAPI adds PHP, Python, JavaScript, Java, C#, Go, Bash; on API types, Attentive adds GraphQL; SMSAPI adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Attentive | SMSAPI |
|---|---|---|
| EU data residency | No | Yes |
| US data residency | Yes | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | No | Yes |
| SOC 2 | Yes | No |
| HIPAA | No | No |
What's the differenceSMSAPI offers EU data residency, while Attentive does not; Attentive offers US data residency, while SMSAPI does not; SMSAPI offers ISO 27001, while Attentive does not; Attentive offers SOC 2, while SMSAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Attentive | SMSAPI |
|---|---|---|
| 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. | 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 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. 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 | Attentive | SMSAPI |
|---|---|---|
| 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. | 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 differenceAttentive and SMSAPI are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Attentive | SMSAPI |
|---|---|---|
| Countries covered | 20 | 0 |
| Direct operator connections | No | No |
| Published uptime SLA | No published SLA | No published SLA |
What's the differenceAttentive leads on Countries covered (20 vs 0 for SMSAPI).
Company & Trust
Independent reviews and company profile.
| Field | Attentive | SMSAPI |
|---|---|---|
| G2 rating | 4.5 | 0.0 |
| G2 reviews | 1,483 | 0 |
| Ownership | private | public |
| Employees | 1,000-1,500 | 51-200 |
What's the differenceAttentive leads on G2 rating (4.5 vs 0 for SMSAPI); Attentive leads on G2 reviews (1,483 vs 0 for SMSAPI).
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