Comparison
Overview
Company snapshot and where each provider is based.
| Field | GatewayAPI | seven.io |
|---|---|---|
| What it is | Danish SMS gateway and messaging platform by ONLINECITY.IO offering SMS, RCS and email APIs with pay-as-you-go pricing and EU data hosting. | German CPaaS platform (formerly sms77) providing SMS, RCS, WhatsApp and voice APIs with data processed on German-hosted infrastructure. |
| Founded | 1999 | 2003 |
| Ownership | private | private |
| Employees | 11-50 | 2-10 |
| HQ city | Odense | Kiel |
| HQ country | Denmark (EU) | Germany (EU) |
What's the differenceGatewayAPI edges ahead on the overall messaging.dev Score (54 vs 42). GatewayAPI is private and headquartered in Odense, Denmark (EU); seven.io is private and based in Kiel, Germany (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | GatewayAPI | seven.io |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| No | Yes | |
| Viber | No | No |
| Facebook Messenger | No | No |
| Telegram | No | No |
| Apple Messages for Business | No | No |
| Voice | No | Yes |
| Yes | No |
What's the differenceThey share 2 channels. GatewayAPI additionally offers Email, while seven.io additionally offers WhatsApp, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GatewayAPI | seven.io |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Test credits on request | €0.50 free test credit |
| Docs quality | med | high |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | PHP, JavaScript, Python, Go, Ruby, .NET, Rust, Kotlin, Elixir, Swift |
| Sandbox / test env | No | Yes |
| API types | REST, SMPP, Email-to-SMS | REST, SMPP, SMTP |
What's the differenceOn SDKs, seven.io adds PHP, JavaScript, Python, Go, Ruby, .NET, Rust, Kotlin, Elixir, Swift; seven.io offers Sandbox / test env, while GatewayAPI does not; on API types, GatewayAPI adds Email-to-SMS; seven.io adds SMTP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GatewayAPI | seven.io |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | No |
| Choose region | Yes | No |
| GDPR | Yes | Yes |
| ISO 27001 | No | Yes |
| SOC 2 | No | No |
| HIPAA | No | No |
What's the differenceGatewayAPI offers Choose region, while seven.io does not; seven.io offers ISO 27001, while GatewayAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GatewayAPI | seven.io |
|---|---|---|
| Retention policy | Message content, sender and recipient are stored in the traffic log for 30 days, after which records are anonymized (message content and full sender deleted, last half of the recipient number removed). An optional "secret" message class skips storage of content, sender and recipient entirely. | Log files are stored only for the legally required period and subsequently anonymized, following a stated data-minimization principle; exact message-content retention periods are not publicly documented in detail. Processing runs on German/EU infrastructure ("Pure EU Routing") in ISO 27001-certified data centers, with an online-signable DPA available. |
What's the differenceGatewayAPI: Message content, sender and recipient are stored in the traffic log for 30 days, after which records are anonymized (message content and full sender deleted, last half of the recipient number removed). An optional "secret" message class skips storage of content, sender and recipient entirely. seven.io: Log files are stored only for the legally required period and subsequently anonymized, following a stated data-minimization principle; exact message-content retention periods are not publicly documented in detail. Processing runs on German/EU infrastructure ("Pure EU Routing") in ISO 27001-certified data centers, with an online-signable DPA available.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GatewayAPI | seven.io |
|---|---|---|
| Pricing model | Pay-as-you-go per-message pricing with prepaid credit; no monthly subscriptions or fees (except short-code countries), with negotiated discounts for high volumes. | Prepaid pay-as-you-go: top up account balance and pay per message sent, with no monthly fee or subscription required for API access. |
| SMS starting price | From €0.0061 per SMS (standard class, cheapest destination on the public price list; e.g. €0.0401 to Denmark) | €0.075 per SMS (base rate incl. Germany and most EU countries); non-EU rates vary by country |
| Free developer credit | Test credits on request | €0.50 free test credit |
What's the differenceGatewayAPI and seven.io are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GatewayAPI | seven.io |
|---|---|---|
| Countries covered | 200 | 0 |
| Direct operator connections | Yes | No |
| Published uptime SLA | No published SLA (99.99%+ historical uptime claimed) | No published SLA |
What's the differenceGatewayAPI leads on Countries covered (200 vs 0 for seven.io); GatewayAPI offers Direct operator connections, while seven.io does not.
Company & Trust
Independent reviews and company profile.
| Field | GatewayAPI | seven.io |
|---|---|---|
| G2 rating | 4.9 | 0.0 |
| G2 reviews | 7 | 0 |
| Ownership | private | private |
| Employees | 11-50 | 2-10 |
What's the differenceGatewayAPI leads on G2 rating (4.9 vs 0 for seven.io); GatewayAPI leads on G2 reviews (7 vs 0 for seven.io).
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