Comms by Osis vs Zernio
Compare Comms by Osis and Zernio side by side: iMessage features, channels, developer tools, pricing and compliance, checked on each provider's own site.
Comms by Osis
iMessage, RCS, SMS and WhatsApp API with hosted agents
- Starting price
- $50/month (shared line); $200/month per dedicated number
- Free plan
- Free: shared platform line, 100 messages a day, no card
Zernio
One API for iMessage, SMS, WhatsApp, social DMs and calls
- Starting price
- $200/month per iMessage sender
- Free plan
- First 2 connected accounts free; free iMessage sandbox on a shared line
Comms by Osis supports 43 of the 77 features compared here, and Zernio supports 57.
Where Comms by Osis is ahead
Where Zernio is ahead
and 10 more in the table below.
Feature comparison
| Feature | ||
|---|---|---|
| iMessage messaging | ||
| iMessage | ||
| Group chats | ||
| Group management | ||
| Group name and photo | ||
| Mentions | Not listed | Not listed |
| Tapbacks | ||
| Threaded replies | ||
| Typing indicators | ||
| Read receipts | ||
| Edit and unsend | ||
| Message effects | Not listed | |
| Animated text effects | Not listed | Not listed |
| Stickers | Not listed | |
| Formatted text | Not listed | |
| Attachments | ||
| Live Photos | Not listed | Not listed |
| Rich link previews | Not listed | |
| Voice messages | Not listedVoice notes are documented for WhatsApp only. | |
| Contact cards | ||
| Polls | Not listed | |
| Chat backgrounds | Not listed | |
| Location sharing | ||
| iMessage apps | Not listed | Not listed |
| Live app cards | Not listed | Not listed |
| Sender name and photo | ||
| FaceTime calls | Not listedInbound FaceTime attempts show in the thread as call-typed messages. No calling documented. | |
| Delivery status | ||
| iMessage availability check | Not listed | |
| Focus and Notify Anyway | Not listed | Not listed |
| Numbers and delivery | ||
| Managed lines | ||
| Dedicated numbers | ||
| Shared numbers | ||
| Bring your own number | ||
| Line pooling | Not listed | Not listedOne sender per profile; docs suggest spreading contacts across senders by hand. |
| SMS fallback | ||
| RCS fallback | ||
| Outbound-first messaging | ||
| Calls on the iMessage number | ||
| Other channels | ||
| SMS | ||
| RCS | ||
| Telegram | Not supportedNot offered | |
| Slack | Not supported | |
Not supportedNot offered as a channel. iMessage senders can use an email handle. | ||
| Phone calls | ||
| Apple Messages for Business | Not supportedNot offered | |
| Unified channel API | ||
| Developer tools | ||
| REST API | ||
| TypeScript SDK | Not listedOnly a runnable Node.js example is published. | |
| Python SDK | Not listed | |
| Other SDKs | Not listed | |
| CLI | Not listed | |
| Webhooks | ||
| Signed webhooks | ||
| MCP server | ||
| Open source | Not listed | |
| Self-hosting | Not listed | Not supportedHosted cloud service only |
| Local testing | Not listed | Not listedThe free sandbox still needs your own phone or Apple ID. |
| Custom channel providers | Not listed | Not listed |
| Event replay | ||
| OpenTelemetry | Not listed | Not listed |
| No-code integrations | ||
| CRM integrations | Not listed | |
| Built for AI agents | ||
| Agent framework | ||
| Agent framework integrations | Not listed | |
| Streaming replies | Not listed | |
| Agent group chats | Not listed | Not listed |
| Human handoff | ||
| Audit logs | Not listed | |
| Message history API | ||
| Plans and compliance | ||
| Free plan | ||
| Public pricing | ||
| No per-message fees | ||
| Uptime SLA | Not listed | Not listedSite states 99.97% uptime; no contractual SLA found. |
| Isolated infrastructure | Not listed | Not listed |
| SOC 2 Type II | Not listed | |
| GDPR | Not listedThe privacy policy mentions GDPR rights; no DPA was found. |
Checked on each provider's own site and docs on 2026-10-25. “Not listed” means the provider does not mention it.
Pricing
Comms by Osis
Free on a shared line with 100 messages a day, Plus at $50 a month on a shared line, Dedicated at $200 a month per number with $0 setup, and custom Enterprise; AI usage is billed separately.
Pricing model: flat monthly per plan or dedicated line; AI usage and call minutes extra
SourceZernio
An iMessage sender costs $200 a month plus Zernio's per-account fee, with a free sandbox; SMS, calls and outbound messages past 10,000 a month are metered.
Pricing model: flat per sender, plus per connected account and usage meters
SourceWhich should you choose?
Choose Comms by Osis if you need polls, chat backgrounds, FaceTime calls and iMessage availability check.
Choose Zernio if you need message effects, stickers, formatted text and rich link previews.
Frequently asked questions
Comms by Osis supports 43 of the 77 features compared here, and Zernio supports 57. Comms by Osis adds polls, chat backgrounds, FaceTime calls and iMessage availability check. Zernio adds message effects, stickers, formatted text, rich link previews and voice messages.
Comms by Osis: Free on a shared line with 100 messages a day, Plus at $50 a month on a shared line, Dedicated at $200 a month per number with $0 setup, and custom Enterprise; AI usage is billed separately. Zernio: An iMessage sender costs $200 a month plus Zernio's per-account fee, with a free sandbox; SMS, calls and outbound messages past 10,000 a month are metered.
Zernio does not list polls on its site or in its docs.
Zernio does not list chat backgrounds on its site or in its docs.
Zernio does not list FaceTime calls on its site or in its docs.