Comparison
Overview
Company snapshot and where each provider is based.
| Field | GatewayAPI | Mitto |
|---|---|---|
| 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. | Swiss omnichannel CPaaS provider offering SMS, RCS, WhatsApp, Viber, Telegram, Facebook Messenger and voice messaging APIs for business communications. |
| Founded | 1999 | 2013 |
| Ownership | private | private |
| Employees | 11-50 | 100-250 |
| HQ city | Odense | Zug |
| HQ country | Denmark (EU) | Switzerland |
What's the differenceGatewayAPI edges ahead on the overall messaging.dev Score (54 vs 48). GatewayAPI is private and headquartered in Odense, Denmark (EU); Mitto is private and based in Zug, Switzerland.
Channels
Which messaging channels each provider can send and receive on.
| Field | GatewayAPI | Mitto |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| No | Yes | |
| Viber | No | Yes |
| Facebook Messenger | No | Yes |
| Telegram | No | Yes |
| Apple Messages for Business | No | No |
| Voice | No | Yes |
| Yes | No |
What's the differenceThey share 2 channels. GatewayAPI additionally offers Email, while Mitto additionally offers WhatsApp, Viber, Facebook Messenger, Telegram, Voice.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | GatewayAPI | Mitto |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | Test credits on request | No |
| Docs quality | med | med |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | — |
| Sandbox / test env | No | Yes |
| API types | REST, SMPP, Email-to-SMS | REST, SMPP |
What's the differenceMitto offers Sandbox / test env, while GatewayAPI does not; on API types, GatewayAPI adds Email-to-SMS.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | GatewayAPI | Mitto |
|---|---|---|
| EU data residency | Yes | No |
| 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 EU data residency, while Mitto does not; GatewayAPI offers Choose region, while Mitto does not; Mitto offers ISO 27001, while GatewayAPI does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | GatewayAPI | Mitto |
|---|---|---|
| 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. | Per-message retention of content (textRetention) and of the recipient number (toRetention) can be set per API request to Undefined, Retain, or Discard; no global retention duration is publicly documented. Per the privacy policy, account/registration data is kept until deletion is requested and contact-form data until the conversation ends. |
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. Mitto: Per-message retention of content (textRetention) and of the recipient number (toRetention) can be set per API request to Undefined, Retain, or Discard; no global retention duration is publicly documented. Per the privacy policy, account/registration data is kept until deletion is requested and contact-form data until the conversation ends.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | GatewayAPI | Mitto |
|---|---|---|
| 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. | Pay-as-you-go — pay only for what you use with no contracts, plus volume discounts and custom plans via sales. |
| SMS starting price | From €0.0061 per SMS (standard class, cheapest destination on the public price list; e.g. €0.0401 to Denmark) | Not published |
| Free developer credit | Test credits on request | No |
What's the differenceGatewayAPI and Mitto are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | GatewayAPI | Mitto |
|---|---|---|
| Countries covered | 200 | 230 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA (99.99%+ historical uptime claimed) | No published SLA |
What's the differenceMitto leads on Countries covered (230 vs 200 for GatewayAPI).
Company & Trust
Independent reviews and company profile.
| Field | GatewayAPI | Mitto |
|---|---|---|
| G2 rating | 4.9 | 4.0 |
| G2 reviews | 7 | 2 |
| Ownership | private | private |
| Employees | 11-50 | 100-250 |
What's the differenceGatewayAPI leads on G2 rating (4.9 vs 4 for Mitto); GatewayAPI leads on G2 reviews (7 vs 2 for Mitto).
Still deciding? Read the quickstart guides: