Comparison
Overview
Company snapshot and where each provider is based.
| Field | BulkSMS | Prelude |
|---|---|---|
| What it is | Business messaging platform for sending bulk SMS and RCS to mobile networks worldwide via web app, API, and SMPP. | 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 | 2000 | 2022 |
| Ownership | private | private |
| Employees | 11-50 | 51-200 |
| HQ city | Cape Town | Paris |
| HQ country | South Africa | France (EU) |
What's the differencePrelude edges ahead on the overall messaging.dev Score (62 vs 43). BulkSMS is private and headquartered in Cape Town, South Africa; Prelude is private and based in Paris, France (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | BulkSMS | Prelude |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| No | Yes | |
| Viber | No | Yes |
| Facebook Messenger | No | No |
| Telegram | No | Yes |
| Apple Messages for Business | No | No |
| Voice | No | Yes |
| No | Yes |
What's the differenceThey share 2 channels. Prelude additionally offers WhatsApp, Viber, Telegram, Voice, Email.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | BulkSMS | Prelude |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | 5 free test SMS on signup | No |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | Node.js, Python, Go, Java, Ruby, PHP, C# |
| Sandbox / test env | No | No |
| API types | REST, HTTP, SMPP, SMTP | REST |
What's the differenceOn SDKs, Prelude adds Node.js, Python, Go, Java, Ruby, PHP, C#; on API types, BulkSMS adds HTTP, SMPP, SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | BulkSMS | Prelude |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | No | Yes |
| SOC 2 | No | Yes |
| HIPAA | No | No |
What's the differencePrelude offers ISO 27001, while BulkSMS does not; Prelude offers SOC 2, while BulkSMS does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | BulkSMS | Prelude |
|---|---|---|
| Retention policy | Message data (content and metadata) is retained for 2 years and then automatically deleted from the system. Account/client data is kept for the duration of service use plus about 7 years after termination. EU-related client data is stored in AWS datacentres in Ireland with encryption at rest. | 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 differenceBulkSMS: Message data (content and metadata) is retained for 2 years and then automatically deleted from the system. Account/client data is kept for the duration of service use plus about 7 years after termination. EU-related client data is stored in AWS datacentres in Ireland with encryption at rest. 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 | BulkSMS | Prelude |
|---|---|---|
| Pricing model | Pay-as-you-go prepaid credits: you buy credits and pay per outbound SMS, with per-message rates varying by destination network and country; no monthly, setup, or contract fees. | 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 (rates shown per destination network via an interactive slider/quote, not a single headline price) | €0.0043 per SMS (US, at-cost); verification fee from €0.032 |
| Free developer credit | 5 free test SMS on signup | No |
What's the differenceBulkSMS and Prelude are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | BulkSMS | Prelude |
|---|---|---|
| Countries covered | 213 | 230 |
| Direct operator connections | No | Yes |
| Published uptime SLA | No published SLA | No published SLA |
What's the differencePrelude leads on Countries covered (230 vs 213 for BulkSMS); Prelude offers Direct operator connections, while BulkSMS does not.
Company & Trust
Independent reviews and company profile.
| Field | BulkSMS | Prelude |
|---|---|---|
| G2 rating | 4.6 | 4.9 |
| G2 reviews | 266 | 13 |
| Ownership | private | private |
| Employees | 11-50 | 51-200 |
What's the differencePrelude leads on G2 rating (4.9 vs 4.6 for BulkSMS); BulkSMS leads on G2 reviews (266 vs 13 for Prelude).
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