Comparison
Overview
Company snapshot and where each provider is based.
| Field | Attentive | Smstools |
|---|---|---|
| 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. | Belgian business-messaging platform by Xtreme Internet Solutions offering an SMS gateway API, bulk SMS marketing software, WhatsApp Business API, voice messages and email-to-SMS with EU-only hosting. |
| Founded | 2016 | 2004 |
| Ownership | private | private |
| Employees | 1,000-1,500 | 1-10 |
| HQ city | New York | Dilsen-Stokkem |
| HQ country | USA | Belgium (EU) |
What's the differenceSmstools edges ahead on the overall messaging.dev Score (56 vs 40). Attentive is private and headquartered in New York, USA; Smstools is private and based in Dilsen-Stokkem, Belgium (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Attentive | Smstools |
|---|---|---|
| SMS | Yes | Yes |
| MMS | Yes | No |
| RCS | Yes | No |
| 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 1 channels. Attentive additionally offers MMS, RCS, Email, while Smstools additionally offers WhatsApp, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Attentive | Smstools |
|---|---|---|
| Self-service onboarding | No | Yes |
| Free developer credit | No | Free test credit on sign-up |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | iOS (Swift), Android (Kotlin), React Native | PHP, Node.js, Python, Ruby, PowerShell |
| Sandbox / test env | Yes | Yes |
| API types | REST, GraphQL | REST, SMTP |
What's the differenceSmstools offers Self-service onboarding, while Attentive does not; on SDKs, Attentive adds iOS (Swift), Android (Kotlin), React Native; Smstools adds PHP, Node.js, Python, Ruby, PowerShell; on API types, Attentive adds GraphQL; Smstools adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Attentive | Smstools |
|---|---|---|
| EU data residency | No | Yes |
| US data residency | Yes | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | No | No |
| SOC 2 | Yes | No |
| HIPAA | No | No |
What's the differenceSmstools offers EU data residency, while Attentive does not; Attentive offers US data residency, while Smstools does not; Attentive offers SOC 2, while Smstools does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Attentive | Smstools |
|---|---|---|
| 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. | Not publicly documented in detail. Smstools states all data is stored on servers located in Europe under GDPR-compliant processes, with AES-256 encryption at rest and TLS 1.3 in transit, and a Data Processing Agreement is available on request, but no specific message content/metadata retention periods are published. |
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. Smstools: Not publicly documented in detail. Smstools states all data is stored on servers located in Europe under GDPR-compliant processes, with AES-256 encryption at rest and TLS 1.3 in transit, and a Data Processing Agreement is available on request, but no specific message content/metadata retention periods are published.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | Attentive | Smstools |
|---|---|---|
| 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 per message with volume discounts; no subscription, setup fee or monthly minimum, with a personalised rate sheet issued on registration. |
| SMS starting price | Not published | From €0.025 per SMS to the USA (rates vary by destination country and volume) |
| Free developer credit | No | Free test credit on sign-up |
What's the differenceAttentive and Smstools are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Attentive | Smstools |
|---|---|---|
| Countries covered | 20 | 200 |
| Direct operator connections | No | Yes |
| Published uptime SLA | No published SLA | 99.99% (uptime SLA) |
What's the differenceSmstools leads on Countries covered (200 vs 20 for Attentive); Smstools offers Direct operator connections, while Attentive does not.
Company & Trust
Independent reviews and company profile.
| Field | Attentive | Smstools |
|---|---|---|
| G2 rating | 4.5 | 0.0 |
| G2 reviews | 1,483 | 0 |
| Ownership | private | private |
| Employees | 1,000-1,500 | 1-10 |
What's the differenceAttentive leads on G2 rating (4.5 vs 0 for Smstools); Attentive leads on G2 reviews (1,483 vs 0 for Smstools).
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