Comparison
Overview
Company snapshot and where each provider is based.
| Field | Sinch | Smstools |
|---|---|---|
| What it is | Cloud communications platform for messaging, voice, and email APIs | 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 | 2008 | 2004 |
| Ownership | public | private |
| Employees | 3,000-5,000 | 1-10 |
| HQ city | Stockholm | Dilsen-Stokkem |
| HQ country | Sweden (EU) | Belgium (EU) |
What's the differenceSinch edges ahead on the overall messaging.dev Score (92 vs 56). Sinch is public and headquartered in Stockholm, Sweden (EU); Smstools is private and based in Dilsen-Stokkem, Belgium (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Sinch | Smstools |
|---|---|---|
| SMS | Yes | Yes |
| MMS | Yes | No |
| RCS | Yes | No |
| Yes | Yes | |
| Viber | Yes | No |
| Facebook Messenger | Yes | No |
| Telegram | Yes | No |
| Apple Messages for Business | Yes | No |
| Voice | Yes | Yes |
| Yes | No |
What's the differenceThey share 3 channels. Sinch additionally offers MMS, RCS, Viber, Facebook Messenger, Telegram, Apple Messages for Business, Email.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Sinch | Smstools |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Yes | Free test credit on sign-up |
| Docs quality | high | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | Java, Python, C#, Node.js, PHP | PHP, Node.js, Python, Ruby, PowerShell |
| Sandbox / test env | Yes | Yes |
| API types | REST, SMTP, SMPP | REST, SMTP |
What's the differenceOn SDKs, Sinch adds Java, C#; Smstools adds Ruby, PowerShell; on API types, Sinch adds SMPP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Sinch | Smstools |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | Yes | No |
| Choose region | Yes | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | No |
| SOC 2 | Yes | No |
| HIPAA | Yes | No |
What's the differenceSinch offers US data residency, while Smstools does not; Sinch offers Choose region, while Smstools does not; Sinch offers ISO 27001, while Smstools does not; Sinch offers SOC 2, while Smstools does not; Sinch offers HIPAA, while Smstools does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Sinch | Smstools |
|---|---|---|
| Retention policy | Sinch retains message and delivery records to provide the service and meet legal obligations; retention windows for message content are limited and, for some products, configurable via data-processing agreements. | 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 differenceSinch: Sinch retains message and delivery records to provide the service and meet legal obligations; retention windows for message content are limited and, for some products, configurable via data-processing agreements. 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 | Sinch | Smstools |
|---|---|---|
| Pricing model | Pay-as-you-go per message with volume and committed-use pricing | 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 | Approx. $0.0075 per US SMS segment (varies by volume; plus carrier fees) | From €0.025 per SMS to the USA (rates vary by destination country and volume) |
| Free developer credit | Yes | Free test credit on sign-up |
What's the differenceSinch and Smstools are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Sinch | Smstools |
|---|---|---|
| Countries covered | 150 | 200 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | 99.95% | 99.99% (uptime SLA) |
What's the differenceSmstools leads on Countries covered (200 vs 150 for Sinch).
Company & Trust
Independent reviews and company profile.
| Field | Sinch | Smstools |
|---|---|---|
| G2 rating | 4.3 | 0.0 |
| G2 reviews | 150 | 0 |
| Ownership | public | private |
| Employees | 3,000-5,000 | 1-10 |
What's the differenceSinch leads on G2 rating (4.3 vs 0 for Smstools); Sinch leads on G2 reviews (150 vs 0 for Smstools).
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