What is the difference between Comms by Osis and Dial?

Comms by Osis supports 43 of the 77 features compared here, and Dial supports 44. Comms by Osis adds group management, group name and photo, edit and unsend, chat backgrounds and location sharing. Dial adds voice messages, TypeScript SDK, Python SDK, CLI and open source.

How much do Comms by Osis and Dial cost?

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. Dial: Pay-as-you-go starts with $5 of free credit. A standard number is $3 a month plus metered SMS and calls, an iMessage number is $250 a month with free messages, and Enterprise is custom.

Does Dial support group management?

Dial does not support group management.

Does Dial support group name and photo?

Dial does not list group name and photo on its site or in its docs.

Does Dial support edit and unsend?

Dial does not list edit and unsend on its site or in its docs.

Comms by Osis vs Dial

Compare Comms by Osis and Dial 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

Visit Comms by Osis Read more

Dial

Phone numbers with calls, SMS and iMessage for AI agents

Starting price: $3/month per standard number; $250/month per iMessage number
Free plan: $5 free credit, no credit card required

Visit Dial Read more

Comms by Osis supports 43 of the 77 features compared here, and Dial supports 44.

Where Comms by Osis is ahead

Where Dial is ahead

and 1 more in the table below.

Feature comparison

Feature	Comms by Osis	Dial
iMessage messaging
iMessage	Supported	SupportedNeeds an iMessage number, provisioned through the API. Pay-as-you-go accounts only.
Group chats	SupportedGroups of 2 to 31 people from a dedicated line with group support. Not on the shared line.	SupportedSend to and read iMessage groups the number was added to. Polls work in groups; replies and reactions do not.
Group management	PartialCreate a group with its first message; adding or removing members is not documented.	Not supportedDocs say Dial cannot create a group, join one or accept an invite link.
Group name and photo	PartialName a group when you create it; group photos and renames are not documented.	Not listedGroup names are read live from the line; no way to set a name or photo is documented.
Mentions	Not listed	Not listed
Tapbacks	SupportedClassic tapbacks or custom emoji, add, replace or remove; reaction webhooks for inbound.	SupportedSix tapback names or any single emoji. Sent only on inbound messages; received on message.received.
Threaded replies	Supportedreply_to_message_id replies inside an iMessage thread; text only.	SupportedNative threaded replies to inbound iMessage or RCS messages, one-to-one only.
Typing indicators	SupportedShow or hide typing dots on iMessage, RCS and WhatsApp.	PartialSend only, one-to-one and in groups. No inbound typing events are documented.
Read receipts	SupportedMark a conversation read to send a receipt; comms.message.read for one-to-one chats.	PartialReports when recipients read your iMessages. No way to mark inbound messages read.
Edit and unsend	PartialUnsend within Apple's 2-minute window on supported lines. No edit endpoint; inbound edits fire events.	Not listed
Message effects	Not listed	Not listed
Animated text effects	Not listed	Not listed
Stickers	Not listed	Not listed
Formatted text	Not listed	Not listed
Attachments	SupportedUp to 32 files and 9 MiB per message, sent as base64.	SupportedOne attachment per iMessage, 5 MB. Images, audio, video, PDF, vCard and iCalendar. No HEIC.
Live Photos	Not listed	Not listed
Rich link previews	Not listed	Not listed
Voice messages	Not listedVoice notes are documented for WhatsApp only.	SupportedA single audio file on an iMessage number is sent as a native voice message.
Contact cards	SupportedSend a vCard over iMessage, SMS or WhatsApp.	SupportedSend .vcf files as media. Inbound cards arrive as text/vcard media (since October 2026).
Polls	Supported2 to 12 options; votes arrive as comms.poll.voted. Tap to vote on iOS 26 and later.	Supported2 to 10 options, one-to-one or in iMessage groups. Votes arrive as events with a live tally.
Chat backgrounds	BetaExperimental: photo or gradient backgrounds on lines that support them.	Not listed
Location sharing	PartialRead locations that contacts choose to share, with update webhooks; the API cannot request a share.	Not listed
iMessage apps	Not listed	Not listed
Live app cards	Not listed	Not listed
Sender name and photo	SupportedContact card API sets name and photo, with native name and photo sharing on supported lines.	SupportedSet the first name, last name and photo shown beside the number's iMessages.
FaceTime calls	PartialAnswer inbound FaceTime audio and video calls by API and stream audio; outbound calls not documented.	Not listed
Delivery status	Supportedsent, delivered and read events, plus a list of delivery attempts.	PartialiMessage sends report no delivery receipts; delivery is inferred once a read arrives.
iMessage availability check	SupportedChecks iMessage, RCS and WhatsApp for a phone number, or iMessage for an email.	SupportedLookup endpoint checks whether any number can receive iMessage or WhatsApp.
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportedHosted lines; no Mac to run.	SupportediMessage numbers are provisioned through the API, with asynchronous setup. No Mac or device needed.
Dedicated numbers	SupportedDedicated plan: $200 a month per number.	SupportedEach number belongs to your account. Docs say only US numbers can be provisioned now.
Shared numbers	SupportedFree and Plus plans run on a shared platform line.	Not listed
Bring your own number	SupportedPort an existing number to a dedicated line; needs approval and a supported number.	Not listed
Line pooling	Not listed	Not listedDocs suggest splitting recipients across several iMessage numbers by hand; no automatic pooling found.
SMS fallback	SupportedAuto routing falls back to SMS only after a clear rejection.	SupportediMessage numbers fall back to RCS or SMS automatically, at no message charge.
RCS fallback	PartialAuto routing tries RCS for plain text on supported dedicated lines with carrier enablement.	Supported
Outbound-first messaging	SupportedDedicated lines can start conversations.	SupportedCold outbound allowed. Each iMessage number can start up to 50 new conversations a day.
Calls on the iMessage number	PartialInbound phone and FaceTime calls to the line can be answered by API; outbound is not documented.	SupportediMessage numbers also place and receive AI voice calls, or forward inbound calls.
Other channels
SMS	SupportedChoose sms explicitly or let auto routing fall back to it.	SupportedTwo-way SMS; MMS to US and Canada. Subscription accounts can text US numbers only.
RCS	PartialOne plain-text message to one number, on supported dedicated lines with carrier enablement.	PartialOnly as automatic fallback from iMessage numbers; not a channel you can pick.
WhatsApp	SupportedSends from the number's WhatsApp Business account when WhatsApp is turned on for it.	BetaBeta, enabled per account. Runs on an iMessage number, one attachment per message.
Telegram	Not supportedNot offered	Not supportedNot offered
Slack	Not supported	Not supportedNot offered as a channel. A Zapier app can forward messages to Slack.
Email	Not supportedNot offered as a channel; the capability check accepts Apple ID emails for iMessage.	Not supportedNot offered
Phone calls	PartialInbound cellular calls can be answered by API, but audio relay works only for FaceTime for now.	SupportedInbound and outbound AI voice calls with transcripts.
Apple Messages for Business	Not supportedNot offered; the site says Comms is distinct from Apple Messages for Business.	Not listedDocs say iMessage numbers send over Apple Messages for Business, but no business chat product is documented.
Unified channel API	SupportedOne send endpoint and message model for iMessage, RCS, WhatsApp and SMS.	SupportedOne messages endpoint and event format for SMS, iMessage and WhatsApp, plus calls.
Developer tools
REST API	Supported	Supported
TypeScript SDK	Not listedOnly a runnable Node.js example is published.	Supported@getdial/sdk
Python SDK	Not listed	Supporteddial-sdk
Other SDKs	Not listed	Not supportedSDK overview lists only Node and Python clients, plus agent framework packages.
CLI	Not listed	Supporteddial CLI, installed with a shell script or npx. Needs Node 22 or later.
Webhooks	Supported	Supported
Signed webhooks	SupportedHMAC-SHA256 in X-Osis-Signature.	SupportedHMAC-SHA256 over timestamp and body, X-Dial-Signature header.
MCP server	SupportedHosted MCP server with OAuth or a scoped API key.	SupportedRemote server with OAuth at getdial.ai/mcp, or local stdio through the CLI.
Open source	Not listed	PartialThe Chat SDK adapter is MIT on GitHub. The platform is closed.
Self-hosting	Not listed	Not listedSelf-Hosted mode only means calls are driven by your own agent server; the platform itself is hosted.
Local testing	Not listed	Not listed
Custom channel providers	Not listed	Not listed
Event replay	PartialUp to six delivery retries and a delivery attempts list; no replay endpoint is documented.	PartialWebhooks retry up to 6 attempts. The live stream replays only about 2 minutes of missed events.
OpenTelemetry	Not listed	Not listed
No-code integrations	BetaHighLevel connector is a development preview; Marketplace approval is pending.	SupportedZapier app with message and call triggers, and send, call and provision actions.
CRM integrations	Not listed	Not listed
Built for AI agents
Agent framework	SupportedHosted agents with instructions, knowledge, handoff and MCP tool connections.	PartialHosted AI voice agent runs calls from a prompt. Messaging is send and receive only.
Agent framework integrations	Not listed	SupportedLangChain, Vercel AI SDK, CrewAI, AutoGen, Microsoft Agent Framework and a Vercel Chat SDK adapter.
Streaming replies	Not listed	Not listed
Agent group chats	Not listed	Not listed
Human handoff	SupportedHandoff controls pause the hosted agent while a person replies in the team inbox.	PartialThe voice agent can transfer a call to a person. No handoff for messaging.
Audit logs	Not listed	Not listed
Message history API	SupportedList messages and conversations on your lines.	SupportedList and search messages, up to the 100 most recent per request.
Plans and compliance
Free plan	SupportedFree: shared platform line, 100 messages a day, no card.	Supported$5 of free credit, no card. Free accounts are capped at 5-minute calls and 2 concurrent calls.
Public pricing	Supported	Supported
No per-message fees	SupportedFlat plans; AI usage and answered call minutes are billed separately.	PartialMessages from a $250/month iMessage number are free. SMS on standard numbers is billed per message.
Uptime SLA	Not listed	PartialUptime SLA listed for Enterprise only.
Isolated infrastructure	Not listed	Not listed
SOC 2 Type II	Not listed	PartialSite says SOC 2 certified. Report type and a report are not published.
GDPR	Not listedThe privacy policy mentions GDPR rights; no DPA was found.	SupportedDPA covers GDPR and UK GDPR, with Standard Contractual Clauses.

Feature

Comms by Osis

Dial

iMessage messaging

iMessage

Needs an iMessage number, provisioned through the API. Pay-as-you-go accounts only.

Group chats

Groups of 2 to 31 people from a dedicated line with group support. Not on the shared line.

Send to and read iMessage groups the number was added to. Polls work in groups; replies and reactions do not.

Group management

PartialCreate a group with its first message; adding or removing members is not documented.

Not supportedDocs say Dial cannot create a group, join one or accept an invite link.

Group name and photo

PartialName a group when you create it; group photos and renames are not documented.

Not listedGroup names are read live from the line; no way to set a name or photo is documented.

Mentions

Not listed

Tapbacks

Classic tapbacks or custom emoji, add, replace or remove; reaction webhooks for inbound.

Six tapback names or any single emoji. Sent only on inbound messages; received on message.received.

Threaded replies

reply_to_message_id replies inside an iMessage thread; text only.

Native threaded replies to inbound iMessage or RCS messages, one-to-one only.

Typing indicators

Show or hide typing dots on iMessage, RCS and WhatsApp.

PartialSend only, one-to-one and in groups. No inbound typing events are documented.

Read receipts

Mark a conversation read to send a receipt; comms.message.read for one-to-one chats.

PartialReports when recipients read your iMessages. No way to mark inbound messages read.

Edit and unsend

PartialUnsend within Apple's 2-minute window on supported lines. No edit endpoint; inbound edits fire events.

Not listed

Message effects

Not listed

Animated text effects

Not listed

Stickers

Not listed

Formatted text

Not listed

Attachments

Up to 32 files and 9 MiB per message, sent as base64.

One attachment per iMessage, 5 MB. Images, audio, video, PDF, vCard and iCalendar. No HEIC.

Live Photos

Not listed

Rich link previews

Not listed

Voice messages

Not listedVoice notes are documented for WhatsApp only.

A single audio file on an iMessage number is sent as a native voice message.

Contact cards

Send a vCard over iMessage, SMS or WhatsApp.

Send .vcf files as media. Inbound cards arrive as text/vcard media (since October 2026).

Polls

2 to 12 options; votes arrive as comms.poll.voted. Tap to vote on iOS 26 and later.

2 to 10 options, one-to-one or in iMessage groups. Votes arrive as events with a live tally.

Chat backgrounds

BetaExperimental: photo or gradient backgrounds on lines that support them.

Not listed

Location sharing

PartialRead locations that contacts choose to share, with update webhooks; the API cannot request a share.

Not listed

iMessage apps

Not listed

Live app cards

Not listed

Sender name and photo

Contact card API sets name and photo, with native name and photo sharing on supported lines.

Set the first name, last name and photo shown beside the number's iMessages.

FaceTime calls

PartialAnswer inbound FaceTime audio and video calls by API and stream audio; outbound calls not documented.

Not listed

Delivery status

sent, delivered and read events, plus a list of delivery attempts.

PartialiMessage sends report no delivery receipts; delivery is inferred once a read arrives.

iMessage availability check

Checks iMessage, RCS and WhatsApp for a phone number, or iMessage for an email.

Lookup endpoint checks whether any number can receive iMessage or WhatsApp.

Focus and Notify Anyway

Not listed

Numbers and delivery

Managed lines

Hosted lines; no Mac to run.

iMessage numbers are provisioned through the API, with asynchronous setup. No Mac or device needed.

Dedicated numbers

Dedicated plan: $200 a month per number.

Each number belongs to your account. Docs say only US numbers can be provisioned now.

Shared numbers

Free and Plus plans run on a shared platform line.

Not listed

Bring your own number

Port an existing number to a dedicated line; needs approval and a supported number.

Not listed

Line pooling

Not listed

Not listedDocs suggest splitting recipients across several iMessage numbers by hand; no automatic pooling found.

SMS fallback

Auto routing falls back to SMS only after a clear rejection.

iMessage numbers fall back to RCS or SMS automatically, at no message charge.

RCS fallback

PartialAuto routing tries RCS for plain text on supported dedicated lines with carrier enablement.

Outbound-first messaging

Dedicated lines can start conversations.

Cold outbound allowed. Each iMessage number can start up to 50 new conversations a day.

Calls on the iMessage number

PartialInbound phone and FaceTime calls to the line can be answered by API; outbound is not documented.

iMessage numbers also place and receive AI voice calls, or forward inbound calls.

Other channels

SMS

Choose sms explicitly or let auto routing fall back to it.

Two-way SMS; MMS to US and Canada. Subscription accounts can text US numbers only.

RCS

PartialOne plain-text message to one number, on supported dedicated lines with carrier enablement.

PartialOnly as automatic fallback from iMessage numbers; not a channel you can pick.

Sends from the number's WhatsApp Business account when WhatsApp is turned on for it.

BetaBeta, enabled per account. Runs on an iMessage number, one attachment per message.

Not supportedNot offered

Slack

Not supported

Not supportedNot offered as a channel. A Zapier app can forward messages to Slack.

Not supportedNot offered as a channel; the capability check accepts Apple ID emails for iMessage.

Not supportedNot offered

Phone calls

PartialInbound cellular calls can be answered by API, but audio relay works only for FaceTime for now.

Inbound and outbound AI voice calls with transcripts.

Apple Messages for Business

Not supportedNot offered; the site says Comms is distinct from Apple Messages for Business.

Not listedDocs say iMessage numbers send over Apple Messages for Business, but no business chat product is documented.

Unified channel API

One send endpoint and message model for iMessage, RCS, WhatsApp and SMS.

One messages endpoint and event format for SMS, iMessage and WhatsApp, plus calls.

Developer tools

REST API

TypeScript SDK

Not listedOnly a runnable Node.js example is published.

@getdial/sdk

Python SDK

Not listed

dial-sdk

Other SDKs

Not listed

Not supportedSDK overview lists only Node and Python clients, plus agent framework packages.

CLI

Not listed

dial CLI, installed with a shell script or npx. Needs Node 22 or later.

Webhooks

Signed webhooks

HMAC-SHA256 in X-Osis-Signature.

HMAC-SHA256 over timestamp and body, X-Dial-Signature header.

MCP server

Hosted MCP server with OAuth or a scoped API key.

Remote server with OAuth at getdial.ai/mcp, or local stdio through the CLI.

Open source

Not listed

PartialThe Chat SDK adapter is MIT on GitHub. The platform is closed.

Self-hosting

Not listed

Not listedSelf-Hosted mode only means calls are driven by your own agent server; the platform itself is hosted.

Local testing

Not listed

Custom channel providers

Not listed

Event replay

PartialUp to six delivery retries and a delivery attempts list; no replay endpoint is documented.

PartialWebhooks retry up to 6 attempts. The live stream replays only about 2 minutes of missed events.

OpenTelemetry

Not listed

No-code integrations

BetaHighLevel connector is a development preview; Marketplace approval is pending.

Zapier app with message and call triggers, and send, call and provision actions.

CRM integrations

Not listed

Built for AI agents

Agent framework

Hosted agents with instructions, knowledge, handoff and MCP tool connections.

PartialHosted AI voice agent runs calls from a prompt. Messaging is send and receive only.

Agent framework integrations

Not listed

LangChain, Vercel AI SDK, CrewAI, AutoGen, Microsoft Agent Framework and a Vercel Chat SDK adapter.

Streaming replies

Not listed

Agent group chats

Not listed

Human handoff

Handoff controls pause the hosted agent while a person replies in the team inbox.

PartialThe voice agent can transfer a call to a person. No handoff for messaging.

Audit logs

Not listed

Message history API

List messages and conversations on your lines.

List and search messages, up to the 100 most recent per request.

Plans and compliance

Free plan

Free: shared platform line, 100 messages a day, no card.

$5 of free credit, no card. Free accounts are capped at 5-minute calls and 2 concurrent calls.

Public pricing

No per-message fees

Flat plans; AI usage and answered call minutes are billed separately.

PartialMessages from a $250/month iMessage number are free. SMS on standard numbers is billed per message.

Uptime SLA

Not listed

PartialUptime SLA listed for Enterprise only.

Isolated infrastructure

Not listed

SOC 2 Type II

Not listed

PartialSite says SOC 2 certified. Report type and a report are not published.

GDPR

Not listedThe privacy policy mentions GDPR rights; no DPA was found.

DPA covers GDPR and UK GDPR, with Standard Contractual Clauses.

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

Source

Dial

Pay-as-you-go starts with $5 of free credit. A standard number is $3 a month plus metered SMS and calls, an iMessage number is $250 a month with free messages, and Enterprise is custom.

Pricing model: per number plus metered usage; iMessage messages free on an iMessage number

Source