Comparison
Overview
Company snapshot and where each provider is based.
| Field | MessageFlow | SMS.to |
|---|---|---|
| What it is | Cross-channel messaging platform by Polish CPaaS company Vercom S.A. (Warsaw Stock Exchange listed), providing email, SMS, RCS, mobile push, Viber and WhatsApp through a single REST API and campaign panel. | Omnichannel business messaging platform and API from Cyprus-based Intergo Telecom for sending SMS, Viber, WhatsApp, RCS and Telegram messages worldwide. |
| Founded | 2005 | 2016 |
| Ownership | public | private |
| Employees | 51-200 | 51-200 |
| HQ city | Poznań | Paphos |
| HQ country | Poland (EU) | Cyprus (EU) |
What's the differenceMessageFlow edges ahead on the overall messaging.dev Score (59 vs 49). MessageFlow is public and headquartered in Poznań, Poland (EU); SMS.to is private and based in Paphos, Cyprus (EU).
Channels
Which messaging channels each provider can send and receive on.
| Field | MessageFlow | SMS.to |
|---|---|---|
| SMS | Yes | Yes |
| MMS | No | No |
| RCS | Yes | Yes |
| Yes | Yes | |
| Viber | Yes | Yes |
| Facebook Messenger | No | No |
| Telegram | No | Yes |
| Apple Messages for Business | No | No |
| Voice | No | No |
| Yes | No |
What's the differenceThey share 4 channels. MessageFlow additionally offers Email, while SMS.to additionally offers Telegram.
Developer Experience
How quickly a developer can sign up and send a first message.
| Field | MessageFlow | SMS.to |
|---|---|---|
| Self-service onboarding | Yes | Yes |
| Free developer credit | 30-day trial: 100 SMS + 100 emails | Free trial credits on sign-up |
| Docs quality | med | med |
| Documentation | Open ↗ | Open ↗ |
| SDKs | — | PHP |
| Sandbox / test env | Yes | No |
| API types | REST, SMTP | REST, SMPP |
What's the differenceOn SDKs, SMS.to adds PHP; MessageFlow offers Sandbox / test env, while SMS.to does not; on API types, MessageFlow adds SMTP; SMS.to adds SMPP.
Data & Compliance
Data residency options and enterprise compliance certifications.
| Field | MessageFlow | SMS.to |
|---|---|---|
| EU data residency | Yes | Yes |
| US data residency | No | Yes |
| Choose region | No | Yes |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| SOC 2 | Yes | No |
| HIPAA | No | No |
What's the differenceSMS.to offers US data residency, while MessageFlow does not; SMS.to offers Choose region, while MessageFlow does not; MessageFlow offers SOC 2, while SMS.to does not.
Data Retention
How long message content and metadata are stored, and whether that is configurable.
| Field | MessageFlow | SMS.to |
|---|---|---|
| Retention policy | All customer data is stated to be stored exclusively on servers within the EEA (Microsoft Azure, AWS). No overall retention period for message content is published; the API docs state sent SMS message data is kept and queryable for 60 days, and the privacy policy retains personal data for the duration of the service agreement plus statutory periods (e.g. accounting records). | Customer data is retained only while the account remains open; on an account deletion request all data is deleted within 30 days. Customers can choose to have data processed only within the EU, in which case it is not transferred outside the EU; per-message content retention periods are not publicly documented in detail. |
What's the differenceMessageFlow: All customer data is stated to be stored exclusively on servers within the EEA (Microsoft Azure, AWS). No overall retention period for message content is published; the API docs state sent SMS message data is kept and queryable for 60 days, and the privacy policy retains personal data for the duration of the service agreement plus statutory periods (e.g. accounting records). SMS.to: Customer data is retained only while the account remains open; on an account deletion request all data is deleted within 30 days. Customers can choose to have data processed only within the EU, in which case it is not transferred outside the EU; per-message content retention periods are not publicly documented in detail.
Pricing & Credits
Pricing model and the cost of a first message.
| Field | MessageFlow | SMS.to |
|---|---|---|
| Pricing model | Monthly subscription tiers priced by contact count (Starter from €69/month) with bundled email/SMS volumes and per-unit overages, plus a customizable Mix & Match plan (from €465/month); SMS rates vary by destination country. | Prepaid pay-as-you-go credit with no contracts or commitments; per-SMS rates vary by destination and volume discounts are negotiated with sales. |
| SMS starting price | Not published (per-country SMS rates shown only in an in-panel calculator; e.g. Grow plan €109/month includes 1,000 SMS) | From $0.023 per SMS (advertised base rate; per-country rates via downloadable price list) |
| Free developer credit | 30-day trial: 100 SMS + 100 emails | Free trial credits on sign-up |
What's the differenceMessageFlow and SMS.to are closely matched on pricing & credits — no material differences in the tracked fields.
Reach & Reliability
Global coverage and delivery dependability.
| Field | MessageFlow | SMS.to |
|---|---|---|
| Countries covered | 190 | 0 |
| Direct operator connections | Yes | Yes |
| Published uptime SLA | No published SLA (custom SLA available on Enterprise plans) | No published SLA (public status page at status.sms.to) |
What's the differenceMessageFlow leads on Countries covered (190 vs 0 for SMS.to).
Company & Trust
Independent reviews and company profile.
| Field | MessageFlow | SMS.to |
|---|---|---|
| G2 rating | 4.9 | 4.4 |
| G2 reviews | 11 | 4 |
| Ownership | public | private |
| Employees | 51-200 | 51-200 |
What's the differenceMessageFlow leads on G2 rating (4.9 vs 4.4 for SMS.to); MessageFlow leads on G2 reviews (11 vs 4 for SMS.to).
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