Comparison
Overview
Company snapshot and where each provider is based.
| Field | SMSAPI | Telesign |
|---|---|---|
| What it is | A Polish business-messaging platform (a brand of LINK Mobility Poland, part of LINK Mobility Group) offering bulk SMS, MMS, VMS voice, RCS and WhatsApp Business messaging via REST API and a web interface. | Digital identity and programmable communications platform offering SMS, RCS, voice, WhatsApp, Viber and email APIs alongside phone verification and fraud-prevention services. |
| Founded | 2007 | 2005 |
| Ownership | public | private |
| Employees | 51-200 | 500-1,000 |
| HQ city | Gliwice | Marina del Rey |
| HQ country | Poland (EU) | USA |
What's the differenceTelesign edges ahead on the overall messaging.dev Score (70 vs 44). SMSAPI is public and headquartered in Gliwice, Poland (EU); Telesign is private and based in Marina del Rey, USA.
Channels
Which messaging channels each provider can send and receive on.
| Field | SMSAPI | Telesign |
|---|---|---|
| SMS | Yes | Yes |
| MMS | Yes | No |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | No | Yes |
| Facebook Messenger | No | No |
| Telegram | No | No |
| Apple Messages for Business | No | No |
| Voice | Yes | Yes |
| No | Yes |
What's the differenceThey share 4 channels. SMSAPI additionally offers MMS, while Telesign additionally offers Viber, Email.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | SMSAPI | Telesign |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Free test SMS on signup | Yes |
| Docs quality | high | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | PHP, Python, JavaScript, Java, C#, Go, Bash | C#, Java, Node.js, PHP, Python, Ruby |
| Sandbox / test env | Yes | No |
| API types | REST, SMTP | REST |
What's the differenceOn SDKs, SMSAPI adds JavaScript, Go, Bash; Telesign adds Node.js, Ruby; SMSAPI offers Sandbox / test env, while Telesign does not; on API types, SMSAPI adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | SMSAPI | Telesign |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | Yes |
| Choose region | No | No |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | No | Yes |
| HIPAA | No | Yes |
What's the differenceTelesign offers US data residency, while SMSAPI does not; Telesign offers SOC 2, while SMSAPI does not; Telesign offers HIPAA, while SMSAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | SMSAPI | Telesign |
|---|---|---|
| Retention policy | Messages are stored in accordance with applicable law and disclosed only when required by a lawful request; phone numbers are used solely for SMS campaign purposes. No specific retention period is publicly documented. All data is held within the EEA on two redundant data centers in Poland (ATMAN and T-Mobile, over 150 km apart). | 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 differenceSMSAPI: Messages are stored in accordance with applicable law and disclosed only when required by a lawful request; phone numbers are used solely for SMS campaign purposes. No specific retention period is publicly documented. All data is held within the EEA on two redundant data centers in Poland (ATMAN and T-Mobile, over 150 km apart). 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 | SMSAPI | Telesign |
|---|---|---|
| Pricing model | Pay-as-you-go prepaid credit — pay only for sent messages with no setup fee or contract; minimum top-up around €30. | 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 | From ~€0.04 per SMS (international, varies by destination country) | Not published |
| Free developer credit | Free test SMS on signup | Yes |
What's the differenceSMSAPI and Telesign are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | SMSAPI | Telesign |
|---|---|---|
| Countries covered | 0 | 230 |
| Direct operator connections | No | Yes |
| Published uptime SLA | No published SLA | No published SLA |
What's the differenceTelesign leads on Countries covered (230 vs 0 for SMSAPI); Telesign offers Direct operator connections, while SMSAPI does not.
Company & Trust
Independent reviews and company profile.
| Field | SMSAPI | Telesign |
|---|---|---|
| G2 rating | 0.0 | 4.3 |
| G2 reviews | 0 | 20 |
| Ownership | public | private |
| Employees | 51-200 | 500-1,000 |
What's the differenceTelesign leads on G2 rating (4.3 vs 0 for SMSAPI); Telesign leads on G2 reviews (20 vs 0 for SMSAPI).
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