Stressed, tired and frustrated business man with headache at laptop.

Sync is Easy to Build.
Hard to Keep Working.

Contact and calendar sync between Microsoft 365, CRM systems, and mobile devices is buildable in-house. What it takes to keep it running is the part most teams don’t price in up front.

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Why Teams Choose to Buy Instead of Build

The Build Is the Small Part.
Keeping It Running Isn’t.

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Build Cost

Mapping fields, writing merge logic, and handling errors before anything goes live. Most teams underestimate this stage because it’s finite and visible. It’s the smallest part of the true cost.

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Ongoing Maintenance

Someone owns keeping up with the platform changes, monitoring sync, catching duplicates, and digging into logs every time a user reports a problem.

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Reliability at Scale

Scripts commonly process one mailbox at a time. Interrupted runs often restart from the top, and failures can be silent until someone notices it at the worst moment.

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Security

A home-grown script can be built securely but someone has to design permission scope, audit its access, and keep documentation current as the build changes.

Comparison graphic of the cost of building vs up keeping sync in house

	Build In-House	With CiraSync
Initial setup	Engineering project	Configure supported connections and rules
Platform changes	Your team maintains it	CiraSync maintains the sync layer
Monitoring & recovery	Build and operate internally	Managed as part of the platform
New requirements	More development	Extend through supported capabilities
Ongoing ownership	Your engineering/IT team	CiraSync

Contacts Synced

Industries

Companies

Users

SOC 2 & GDPR

Compliant

Real Teams, Real Tradeoffs

“CiraSync is a solution we find indispensable; no other syncing solution comes close.”

Ed H. Senior Network Administrator/ IT

How The Morse Group Solved an 8–10 Year Problem

Their IT team had tried everything, including hiring a person whose job was literally updating and deleting contacts by hand. Nothing stuck until CiraSync.

Years of manual fixes, including a dedicated staff role, before finding an automated solution
Live and syncing within a couple of hours once they found the right approach
Saves 500+ IT hours annually across 2,500 employees and contractors nationwide

“We looked for a product to do this for a very long time and even invested a ridiculous amount of money to have someone build us an Azure based app/site to do the sync, which eventually stopped working after Azure updates and changes.”

Doran B. Capterra review

The Real Cost of a Custom Build, in One Customer’s Words

Before finding CiraSync, this team had already paid to have the same problem solved from scratch.

Invested significant cost in a custom-built Azure app to sync contacts
The custom build eventually broke when Azure changed its platform underneath it
Was syncing a company-wide contact list within an hour of switching to CiraSync

Frequently Asked Questions

How long does it take to get CiraSync live, compared to building this ourselves?

Most environments configure sources, audience (including Entra ID groups through Collections), and delivery method, and go live in days. A comparable in-house build typically takes weeks to months before the first sync runs, before any of the maintenance work below even starts.

What does "ongoing maintenance" actually mean if we build this ourselves?

In practice: monitoring sync runs, catching and resolving duplicate records, updating merge logic as new sources or fields get added, and troubleshooting individual user reports one at a time. None of this is unusual engineering work. It’s just work that doesn’t stop, and it usually falls to whoever wrote the original script, whether or not that’s still their job.

What's included out of the box, versus what we'd have to build ourselves?

Multiple sources with merge priority, field-level control, Collections for group-based targeting, CRM connectors, and cross-tenant sync are already built into CiraSync. In a home-grown build, each of these is a separate engineering project, and each new request (a second source, a new CRM, group-based targeting) adds more custom code to maintain.

How does CiraSync handle security and access control?

Access is scoped and consent-based. Every change is recorded and reversible through the History Pane. A home-grown script can be built securely, but designing, documenting, and auditing that access is work a team takes on itself.

What happens if we need sync to run in both directions, or across multiple tenants?

The same tradeoffs get larger once contacts or records need to move in both directions, like keeping a CRM and Microsoft 365 aligned with each other. A one-way script becomes two processes watching for conflicts, so an error now runs both ways instead of one. CiraSync applies the same visibility, access controls, and automated conflict handling whether sync runs one way, two ways, or across multiple tenants.

Ready to See This for Your Environment?

Bring a script or an architecture in mind. CiraSync’s team will show you exactly where it holds up and where it doesn’t.

Talk to a Human

Sync is Easy to Build.Hard to Keep Working.

The Build Is the Small Part.Keeping It Running Isn’t.