Comparison
Overview
Company snapshot and where each provider is based.
| Field | Prelude | Telesign |
|---|---|---|
| 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. | Digital identity and programmable communications platform offering SMS, RCS, voice, WhatsApp, Viber and email APIs alongside phone verification and fraud-prevention services. |
| Founded | 2022 | 2005 |
| Ownership | private | private |
| Employees | 51-200 | 500-1,000 |
| HQ city | Paris | Marina del Rey |
| HQ country | France (EU) | USA |
What's the differenceTelesign edges ahead on the overall messaging.dev Score (70 vs 62). Prelude is private and headquartered in Paris, France (EU); Telesign is private and based in Marina del Rey, USA.
Channels
Which messaging channels each provider can send and receive on.
| Field | Prelude | Telesign |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | Yes |
| Facebook Messenger | No | No |
| Telegram | Yes | No |
| Apple Messages for Business | No | No |
| Voice | Yes | Yes |
| Yes | Yes |
What's the differenceThey share 6 channels. Prelude additionally offers Telegram.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | Prelude | Telesign |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | No | Yes |
| Docs quality | high | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | Node.js, Python, Go, Java, Ruby, PHP, C# | C#, Java, Node.js, PHP, Python, Ruby |
| Sandbox / test env | No | No |
| API types | REST | REST |
What's the differenceOn SDKs, Prelude adds Go.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | Prelude | Telesign |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | Yes |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | Yes | Yes |
| HIPAA | No | Yes |
What's the differenceTelesign offers US data residency, while Prelude does not; Telesign offers HIPAA, while Prelude does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | Prelude | Telesign |
|---|---|---|
| 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. | Customer transaction data is retained for 90 days for operational troubleshooting and billing purposes, with full backups maintained across two separate data centers also kept for 90 days. |
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. Telesign: Customer transaction data is retained for 90 days for operational troubleshooting and billing purposes, with full backups maintained across two separate data centers also kept for 90 days.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | Prelude | Telesign |
|---|---|---|
| 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/per-transaction pricing with volume-based enterprise contracts; public per-message rates are not transparently listed. |
| SMS starting price | €0.0043 per SMS (US, at-cost); verification fee from €0.032 | Not published |
| Free developer credit | No | Yes |
What's the differencePrelude and Telesign are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | Prelude | Telesign |
|---|---|---|
| Countries covered | 230 | 230 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA | No published SLA |
What's the differencePrelude and Telesign are closely matched on reach & reliability — no material differences in the tracked fields.
Company & Trust
Independent reviews and company profile.
| Field | Prelude | Telesign |
|---|---|---|
| G2 rating | 4.9 | 4.3 |
| G2 reviews | 13 | 20 |
| Ownership | private | private |
| Employees | 51-200 | 500-1,000 |
What's the differencePrelude leads on G2 rating (4.9 vs 4.3 for Telesign); Telesign leads on G2 reviews (20 vs 13 for Prelude).
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