What is the difference between Comms by Osis and Project Blue?

Comms by Osis supports 43 of the 77 features compared here, and Project Blue supports 42. Comms by Osis adds threaded replies, read receipts, edit and unsend, polls and chat backgrounds. Project Blue adds message effects, voice messages, line pooling, Slack and TypeScript SDK.

Does Project Blue support threaded replies?

Project Blue does not list threaded replies on its site or in its docs.

Does Project Blue support read receipts?

Project Blue does not list read receipts on its site or in its docs.

Does Project Blue support edit and unsend?

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

Comms by Osis vs Project Blue

Q: How much do Comms by Osis and Project Blue 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. Project Blue: Flat per-line pricing: $166 a month per line billed annually or $199 a month per line on a 12-month plan, with a free trial on a shared line.

Compare Comms by Osis and Project Blue 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

Project Blue

iMessage, SMS and FaceTime Audio lines inside your CRM

Starting price: $166/month per line, billed annually
Free plan: Free trial on a shared line, verified numbers only

Visit Project Blue Read more

Comms by Osis supports 43 of the 77 features compared here, and Project Blue supports 42.

Where Comms by Osis is ahead

and 2 more in the table below.

Where Project Blue is ahead

and 1 more in the table below.

Feature comparison

Feature	Comms by Osis	Project Blue
iMessage messaging
iMessage	Supported	Supported
Group chats	SupportedGroups of 2 to 31 people from a dedicated line with group support. Not on the shared line.	SupportedSend to groups of 2 to 32 by API. Not on trial accounts, and group sends do not sync to the CRM.
Group management	PartialCreate a group with its first message; adding or removing members is not documented.	PartialGroups are created by sending to a set of numbers. No add or remove member endpoints documented.
Group name and photo	PartialName a group when you create it; group photos and renames are not documented.	PartialgroupName can be set when a group is created. No group photo documented.
Mentions	Not listed	Not listed
Tapbacks	SupportedClassic tapbacks or custom emoji, add, replace or remove; reaction webhooks for inbound.	PartialSend or remove the six classic tapbacks on inbound iMessages. Receiving reactions is not documented.
Threaded replies	Supportedreply_to_message_id replies inside an iMessage thread; text only.	Not listed
Typing indicators	SupportedShow or hide typing dots on iMessage, RCS and WhatsApp.	PartialSend only, iMessage only, into an existing conversation. Inbound typing events not documented.
Read receipts	SupportedMark a conversation read to send a receipt; comms.message.read for one-to-one chats.	Not listed
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	Supported4 bubble and 9 screen effects through the effect field. iMessage only.
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.	SupportedImages, videos and vCards by URL.
Live Photos	Not listed	Not listed
Rich link previews	Not listed	Not listed
Voice messages	Not listedVoice notes are documented for WhatsApp only.	SupportedAudio files sent as voice memos, plus AI text-to-speech voice memos.
Contact cards	SupportedSend a vCard over iMessage, SMS or WhatsApp.	SupportedVCF files through mediaAttachmentUrl.
Polls	Supported2 to 12 options; votes arrive as comms.poll.voted. Tap to vote on iOS 26 and later.	Not listed
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, read and share a line's Share Name and Photo card by API.
FaceTime calls	PartialAnswer inbound FaceTime audio and video calls by API and stream audio; outbound calls not documented.	PartialFaceTime Audio only, outbound and inbound, on FaceTime-enabled accounts. Not on trials.
Delivery status	Supportedsent, delivered and read events, plus a list of delivery attempts.	PartialMessages carry a status field such as delivered. Webhooks cover only inbound and outbound messages.
iMessage availability check	SupportedChecks iMessage, RCS and WhatsApp for a phone number, or iMessage for an email.	Supported
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportedHosted lines; no Mac to run.	SupportedNo iPhone, Mac or SIM needed. Lines are set up remotely, usually within one business day.
Dedicated numbers	SupportedDedicated plan: $200 a month per number.	SupportedA dedicated line per rep, never shared. New lines are requested by API and provisioned by the team.
Shared numbers	SupportedFree and Plus plans run on a shared platform line.	PartialTrial accounts only: a shared line that can reach verified numbers.
Bring your own number	SupportedPort an existing number to a dedicated line; needs approval and a supported number.	SupportedExisting numbers can be ported to Project Blue's carrier partner.
Line pooling	Not listed	SupportedSends without lineId are load balanced across your lines.
SMS fallback	SupportedAuto routing falls back to SMS only after a clear rejection.	SupportedFalls back to SMS from the same line when iMessage is unavailable.
RCS fallback	PartialAuto routing tries RCS for plain text on supported dedicated lines with carrier enablement.	Not listedHomepage describes fallback from iMessage to WhatsApp to SMS. RCS fallback is not described.
Outbound-first messaging	SupportedDedicated lines can start conversations.	SupportedLines are sold as outbound-ready. Guidelines rule out mass outbound iMessage.
Calls on the iMessage number	PartialInbound phone and FaceTime calls to the line can be answered by API; outbound is not documented.	SupportedDialer and FaceTime Audio calls from the same number as the messaging line.
Other channels
SMS	SupportedChoose sms explicitly or let auto routing fall back to it.	Supported
RCS	PartialOne plain-text message to one number, on supported dedicated lines with carrier enablement.	PartialRCS for rich media was rolled out in 2026. The API lists RCS as inbound only.
WhatsApp	SupportedSends from the number's WhatsApp Business account when WhatsApp is turned on for it.	PartialHomepage lists WhatsApp as a fallback step. No WhatsApp option in the API, and llms.txt says it is not a WhatsApp API.
Telegram	Not supportedNot offered	Not supportedNot offered
Slack	Not supported	PartialSlack notifications for inbound replies. Not a messaging channel.
Email	Not supportedNot offered as a channel; the capability check accepts Apple ID emails for iMessage.	Not supportedDeveloper page says it is not a general email API.
Phone calls	PartialInbound cellular calls can be answered by API, but audio relay works only for FaceTime for now.	SupportedCloud dialer with inbound, outbound, routing, recording and voicemail, plus a browser calling SDK.
Apple Messages for Business	Not supportedNot offered; the site says Comms is distinct from Apple Messages for Business.	Not supportedNot offered
Unified channel API	SupportedOne send endpoint and message model for iMessage, RCS, WhatsApp and SMS.	PartialOne send endpoint covers iMessage and SMS. Calls and FaceTime use separate endpoints.
Developer tools
REST API	Supported	SupportedREST API with Bearer keys and an OpenAPI spec.
TypeScript SDK	Not listedOnly a runnable Node.js example is published.	Partial@tryprojectblue/dialer is a browser SDK for phone calls only. No messaging SDK.
Python SDK	Not listed	Not listed
Other SDKs	Not listed	Not listed
CLI	Not listed	Not listed
Webhooks	Supported	SupportedInbound and outbound message events and inbound FaceTime call events.
Signed webhooks	SupportedHMAC-SHA256 in X-Osis-Signature.	Not listedWebhook docs do not mention signatures.
MCP server	SupportedHosted MCP server with OAuth or a scoped API key.	SupportedRemote MCP server with OAuth 2.1, plus an optional Claude Code plugin.
Open source	Not listed	PartialThe dialer SDK is MIT licensed on npm. The platform is closed.
Self-hosting	Not listed	Not listedHosted service on Project Blue lines. Self-hosting is not mentioned.
Local testing	Not listed	Not listedTrial accounts send real messages to verified numbers; docs say they are not a simulator.
Custom channel providers	Not listed	Not listed
Event replay	PartialUp to six delivery retries and a delivery attempts list; no replay endpoint is documented.	Not supportedDocs say webhooks have no retries and failed deliveries are not replayed.
OpenTelemetry	Not listed	Not listed
No-code integrations	BetaHighLevel connector is a development preview; Marketplace approval is pending.	SupportedGoHighLevel conversation provider with workflow actions and triggers. llms.txt also lists Zapier.
CRM integrations	Not listed	SupportedHubSpot and Close CRM. Salesforce is not listed.
Built for AI agents
Agent framework	SupportedHosted agents with instructions, knowledge, handoff and MCP tool connections.	Not listed
Agent framework integrations	Not listed	Not listed
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.	PartialReps reply in the CRM inbox and can join group threads. No agent handoff controls documented.
Audit logs	Not listed	Not listed
Message history API	SupportedList messages and conversations on your lines.	SupportedList and get messages, inbound and outbound, with filters.
Plans and compliance
Free plan	SupportedFree: shared platform line, 100 messages a day, no card.	PartialFree trial on a shared line to verified numbers. Some endpoints are off on trial.
Public pricing	Supported	Supported$166/month per line billed annually, or $199/month per line on a 12-month plan.
No per-message fees	SupportedFlat plans; AI usage and answered call minutes are billed separately.	SupportedFlat per-line pricing with unlimited texting under fair use.
Uptime SLA	Not listed	Not listedSite cites a 99.9% uptime record and a public status page. No contractual SLA found.
Isolated infrastructure	Not listed	PartialEach rep gets a dedicated line that is never shared. Other infrastructure is not described.
SOC 2 Type II	Not listed	Not listed
GDPR	Not listedThe privacy policy mentions GDPR rights; no DPA was found.	PartialPrivacy policy lists GDPR and UK GDPR rights. No DPA found.

Feature

Comms by Osis

Project Blue

iMessage messaging

iMessage

Group chats

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

Send to groups of 2 to 32 by API. Not on trial accounts, and group sends do not sync to the CRM.

Group management

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

PartialGroups are created by sending to a set of numbers. No add or remove member endpoints documented.

Group name and photo

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

PartialgroupName can be set when a group is created. No group photo documented.

Mentions

Not listed

Tapbacks

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

PartialSend or remove the six classic tapbacks on inbound iMessages. Receiving reactions is not documented.

Threaded replies

reply_to_message_id replies inside an iMessage thread; text only.

Not listed

Typing indicators

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

PartialSend only, iMessage only, into an existing conversation. Inbound typing events not documented.

Read receipts

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

Not listed

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

4 bubble and 9 screen effects through the effect field. iMessage only.

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.

Images, videos and vCards by URL.

Live Photos

Not listed

Rich link previews

Not listed

Voice messages

Not listedVoice notes are documented for WhatsApp only.

Audio files sent as voice memos, plus AI text-to-speech voice memos.

Contact cards

Send a vCard over iMessage, SMS or WhatsApp.

VCF files through mediaAttachmentUrl.

Polls

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

Not listed

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, read and share a line's Share Name and Photo card by API.

FaceTime calls

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

PartialFaceTime Audio only, outbound and inbound, on FaceTime-enabled accounts. Not on trials.

Delivery status

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

PartialMessages carry a status field such as delivered. Webhooks cover only inbound and outbound messages.

iMessage availability check

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

Focus and Notify Anyway

Not listed

Numbers and delivery

Managed lines

Hosted lines; no Mac to run.

No iPhone, Mac or SIM needed. Lines are set up remotely, usually within one business day.

Dedicated numbers

Dedicated plan: $200 a month per number.

A dedicated line per rep, never shared. New lines are requested by API and provisioned by the team.

Shared numbers

Free and Plus plans run on a shared platform line.

PartialTrial accounts only: a shared line that can reach verified numbers.

Bring your own number

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

Existing numbers can be ported to Project Blue's carrier partner.

Line pooling

Not listed

Sends without lineId are load balanced across your lines.

SMS fallback

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

Falls back to SMS from the same line when iMessage is unavailable.

RCS fallback

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

Not listedHomepage describes fallback from iMessage to WhatsApp to SMS. RCS fallback is not described.

Outbound-first messaging

Dedicated lines can start conversations.

Lines are sold as outbound-ready. Guidelines rule out mass outbound iMessage.

Calls on the iMessage number

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

Dialer and FaceTime Audio calls from the same number as the messaging line.

Other channels

SMS

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

RCS

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

PartialRCS for rich media was rolled out in 2026. The API lists RCS as inbound only.

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

PartialHomepage lists WhatsApp as a fallback step. No WhatsApp option in the API, and llms.txt says it is not a WhatsApp API.

Not supportedNot offered

Slack

Not supported

PartialSlack notifications for inbound replies. Not a messaging channel.

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

Not supportedDeveloper page says it is not a general email API.

Phone calls

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

Cloud dialer with inbound, outbound, routing, recording and voicemail, plus a browser calling SDK.

Apple Messages for Business

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

Not supportedNot offered

Unified channel API

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

PartialOne send endpoint covers iMessage and SMS. Calls and FaceTime use separate endpoints.

Developer tools

REST API

REST API with Bearer keys and an OpenAPI spec.

TypeScript SDK

Not listedOnly a runnable Node.js example is published.

Partial@tryprojectblue/dialer is a browser SDK for phone calls only. No messaging SDK.

Not listed

Not listed

Not listed

Inbound and outbound message events and inbound FaceTime call events.

Signed webhooks

HMAC-SHA256 in X-Osis-Signature.

Not listedWebhook docs do not mention signatures.

MCP server

Hosted MCP server with OAuth or a scoped API key.

Remote MCP server with OAuth 2.1, plus an optional Claude Code plugin.

Open source

Not listed

PartialThe dialer SDK is MIT licensed on npm. The platform is closed.

Self-hosting

Not listed

Not listedHosted service on Project Blue lines. Self-hosting is not mentioned.

Local testing

Not listed

Not listedTrial accounts send real messages to verified numbers; docs say they are not a simulator.

Custom channel providers

Not listed

Event replay

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

Not supportedDocs say webhooks have no retries and failed deliveries are not replayed.

OpenTelemetry

Not listed

No-code integrations

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

GoHighLevel conversation provider with workflow actions and triggers. llms.txt also lists Zapier.

CRM integrations

Not listed

HubSpot and Close CRM. Salesforce is not listed.

Built for AI agents

Agent framework

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

Not listed

Agent framework integrations

Not listed

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.

PartialReps reply in the CRM inbox and can join group threads. No agent handoff controls documented.

Audit logs

Not listed

Message history API

List messages and conversations on your lines.

List and get messages, inbound and outbound, with filters.

Plans and compliance

Free plan

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

PartialFree trial on a shared line to verified numbers. Some endpoints are off on trial.

Public pricing

$166/month per line billed annually, or $199/month per line on a 12-month plan.

No per-message fees

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

Flat per-line pricing with unlimited texting under fair use.

Uptime SLA

Not listed

Not listedSite cites a 99.9% uptime record and a public status page. No contractual SLA found.

Isolated infrastructure

Not listed

PartialEach rep gets a dedicated line that is never shared. Other infrastructure is not described.

SOC 2 Type II

Not listed

GDPR

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

PartialPrivacy policy lists GDPR and UK GDPR rights. No DPA 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

Source