Comparison
Overview
Company snapshot and where each provider is based.
| Field | GMS | Prelude |
|---|---|---|
| What it is | Enterprise CPaaS and A2P messaging provider offering SMS, WhatsApp, Viber, RCS and email through a single API, plus messaging-hub and SMS-firewall services for mobile network operators. | Developer platform for phone and email verification (OTP), authentication, number intelligence, and anti-fraud onboarding delivered across SMS, RCS, WhatsApp, voice and other channels. |
| Founded | 2006 | 2022 |
| Ownership | private | private |
| Employees | 500-1,000 | 51-200 |
| HQ city | Baar | Paris |
| HQ country | Switzerland | France (EU) |
What's the differencePrelude edges ahead on the overall messaging.dev Score (62 vs 36). GMS is private and headquartered in Baar, Switzerland; Prelude is private and based in Paris, France (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | GMS | Prelude |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | Yes |
| Facebook Messenger | No | No |
| Telegram | No | Yes |
| Apple Messages for Business | No | No |
| Voice | No | Yes |
| Yes | Yes |
What's the differenceThey share 5 channels. Prelude additionally offers Telegram, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GMS | Prelude |
|---|---|---|
| Self-service onboarding | No | Yes |
| Free developer credit | No | No |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | iOS (Swift), Android (Kotlin) | Node.js, Python, Go, Java, Ruby, PHP, C# |
| Sandbox / test env | No | No |
| API types | REST | REST |
What's the differencePrelude offers Self-service onboarding, while GMS does not; on SDKs, GMS adds iOS (Swift), Android (Kotlin); Prelude adds Node.js, Python, Go, Java, Ruby, PHP, C#.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GMS | Prelude |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | No | Yes |
| HIPAA | No | No |
What's the differencePrelude offers SOC 2, while GMS does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GMS | Prelude |
|---|---|---|
| Retention policy | Not publicly documented in detail. GMS's privacy notice states personal data is processed under EU GDPR (Regulation (EU) 2016/679) and held at its Switzerland headquarters (recognized by the European Commission as providing an adequate level of data protection); no specific retention periods for message content or metadata are published. GMS also holds ISO/IEC 27701 (privacy information management) certification. | 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. |
What's the differenceGMS: Not publicly documented in detail. GMS's privacy notice states personal data is processed under EU GDPR (Regulation (EU) 2016/679) and held at its Switzerland headquarters (recognized by the European Commission as providing an adequate level of data protection); no specific retention periods for message content or metadata are published. GMS also holds ISO/IEC 27701 (privacy information management) certification. Prelude: 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.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GMS | Prelude |
|---|---|---|
| Pricing model | Custom enterprise pricing negotiated with sales; no public self-service or per-message price list. | Pay-as-you-go per-verification pricing plus at-cost (zero-markup) per-message charges, with optional Startup subscription and custom Enterprise tiers. |
| SMS starting price | Not published | €0.0043 per SMS (US, at-cost); verification fee from €0.032 |
| Free developer credit | No | No |
What's the differenceGMS and Prelude are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GMS | Prelude |
|---|---|---|
| Countries covered | 0 | 230 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | 99.99% network availability (claimed; no formal SLA published) | No published SLA |
What's the differencePrelude leads on Countries covered (230 vs 0 for GMS).
Company & Trust
Independent reviews and company profile.
| Field | GMS | Prelude |
|---|---|---|
| G2 rating | 0.0 | 4.9 |
| G2 reviews | 0 | 13 |
| Ownership | private | private |
| Employees | 500-1,000 | 51-200 |
What's the differencePrelude leads on G2 rating (4.9 vs 0 for GMS); Prelude leads on G2 reviews (13 vs 0 for GMS).
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