Comparison
Overview
Company snapshot and where each provider is based.
| Field | Prelude | Smstools |
|---|---|---|
| What it is | Developer platform for phone and email verification (OTP), authentication, number intelligence, and anti-fraud onboarding delivered across SMS, RCS, WhatsApp, voice and other channels. | 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 | 2022 | 2004 |
| Ownership | private | private |
| Employees | 51-200 | 1-10 |
| HQ city | Paris | Dilsen-Stokkem |
| HQ country | France (EU) | Belgium (EU) |
What's the differencePrelude edges ahead on the overall messaging.dev Score (62 vs 56). Prelude is private and headquartered in Paris, France (EU); Smstools is private and based in Dilsen-Stokkem, Belgium (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | Prelude | Smstools |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | No |
| Yes | Yes | |
| Viber | Yes | No |
| Facebook Messenger | No | No |
| Telegram | Yes | No |
| Apple Messages for Business | No | No |
| Voice | Yes | Yes |
| Yes | No |
What's the differenceThey share 3 channels. Prelude additionally offers RCS, Viber, Telegram, Email.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Prelude | Smstools |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | No | Free test credit on sign-up |
| Docs quality | high | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | Node.js, Python, Go, Java, Ruby, PHP, C# | PHP, Node.js, Python, Ruby, PowerShell |
| Sandbox / test env | No | Yes |
| API types | REST | REST, SMTP |
What's the differenceOn SDKs, Prelude adds Go, Java, C#; Smstools adds PowerShell; Smstools offers Sandbox / test env, while Prelude does not; on API types, Smstools adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Prelude | Smstools |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | No |
| SOC 2 | Yes | No |
| HIPAA | No | No |
What's the differencePrelude offers ISO 27001, while Smstools does not; Prelude offers SOC 2, while Smstools does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Prelude | Smstools |
|---|---|---|
| Retention policy | Not publicly documented in detail. Prelude is a European (Paris-based) company that hosts and processes data in EU data centers under GDPR, with SOC 2 Type 2 and ISO 27001:2022 controls including encryption of data in transit and at rest. It states that only essential data is stored for delivery tracking, but specific message-content and metadata retention periods are not published on the site or trust center. | 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 differencePrelude: Not publicly documented in detail. Prelude is a European (Paris-based) company that hosts and processes data in EU data centers under GDPR, with SOC 2 Type 2 and ISO 27001:2022 controls including encryption of data in transit and at rest. It states that only essential data is stored for delivery tracking, but specific message-content and metadata retention periods are not published on the site or trust center. 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 | Prelude | Smstools |
|---|---|---|
| Pricing model | Pay-as-you-go per-verification pricing plus at-cost (zero-markup) per-message charges, with optional Startup subscription and custom Enterprise tiers. | 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 | €0.0043 per SMS (US, at-cost); verification fee from €0.032 | 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 differencePrelude and Smstools are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Prelude | Smstools |
|---|---|---|
| Countries covered | 230 | 200 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA | 99.99% (uptime SLA) |
What's the differencePrelude leads on Countries covered (230 vs 200 for Smstools).
Company & Trust
Independent reviews and company profile.
| Field | Prelude | Smstools |
|---|---|---|
| G2 rating | 4.9 | 0.0 |
| G2 reviews | 13 | 0 |
| Ownership | private | private |
| Employees | 51-200 | 1-10 |
What's the differencePrelude leads on G2 rating (4.9 vs 0 for Smstools); Prelude leads on G2 reviews (13 vs 0 for Smstools).
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