// Guides · Switching
How do you add an AI CRM without leaving HubSpot?
Run the AI-native CRM next to HubSpot and connect them with a two-way sync for contacts, companies, and deals. HubSpot stays the system of record for whatever the parent company, finance, or marketing reports on. The new CRM becomes the place sellers work, reading email and calendar and proposing updates. Before you switch the sync on, write down which system owns each field, because a field with two owners is where duplicates and overwrites start.
This guide is for teams that are not allowed to leave, or not ready to. If you have already decided to go, the export side is covered in what transfers when you leave HubSpot, and the timing in how to switch CRMs before your renewal date.
When does running both make sense?
More often than a vendor trying to replace HubSpot will admit. I spent around a decade at HubSpot, so I am not going to tell you it is the wrong system for everyone, and plenty of teams are not the ones who chose it anyway. The most direct version of this I heard in a sales call this year came from a company whose parent group requires HubSpot: whatever they added had to "work alongside it, not replace it," and a sync in both directions was the condition. They did not want a migration plan. They wanted their sellers to stop typing while the group kept its reports.
There are three other situations where I would keep HubSpot and add a second system rather than switch:
- Marketing runs on Marketing Hub. Forms, lists, nurture emails, and attribution all depend on HubSpot contact records. Moving the sales CRM is a far smaller project than moving marketing, and nobody should do both in one quarter.
- One automation is load-bearing. Another prospect told us plainly that trigger-based email automation was the piece keeping them on HubSpot. If a workflow like that genuinely earns its keep, leave it where it runs and let the sync feed it clean data.
- You want evidence before a decision. Running the new system beside HubSpot for a month, on real deals, answers the question better than any demo can. If the answer is "switch," you switch with a month of history already in place.
If none of those applies and the only reason for keeping HubSpot is inertia, the two-system setup adds cost and a sync to babysit for no real gain, and I would rather you migrate properly.
What stays in HubSpot, and what moves?
Decide this per field, not per object. A contact can be owned by HubSpot for lifecycle stage and by the new CRM for the last-contacted date. The table is a starting point I would adjust for your own reporting, not a rule.
| Data | System that owns it | Sync direction |
|---|---|---|
| Contact and company identity (name, email, domain, phone) | Whichever system creates the record; matched on email and domain | Both ways |
| Lifecycle stage, lead status, marketing properties | HubSpot | HubSpot to the AI CRM, read-only there |
| Deal stage, amount, close date, next step | The AI CRM, where sellers work | AI CRM to HubSpot |
| Deal and record owner | HubSpot, matched to users by email | Both ways once owners are mapped |
| Pipelines and stage definitions | HubSpot; mapped once at setup | Mapped, not continuously edited |
| Email, meeting, and call activity | The AI CRM, which reads the inbox and calendar | Stays where it was captured |
| Marketing emails, forms, lists, workflows | HubSpot | Not synced |
| Custom properties nobody reports on | Nobody | Leave them out of the mapping |
The row people argue about is deal stage. Finance and the parent company want it in HubSpot, and they can have it there, but it should be written in one place. If reps are working in the new system, that is where the stage changes, and HubSpot receives the result.
Where do two-system setups break?
Two owners for one field. A rep moves a deal to Negotiation in the new CRM; ten minutes later a HubSpot workflow sets it back to Proposal because a property changed. The sync faithfully copies each change to the other side, and the deal flips between stages all afternoon. The fix is the table above, plus turning off any HubSpot workflow that writes to a field the other system owns.
Field mapping that looks right and is not. Picklists are the usual culprit. HubSpot's lifecycle stage is a set list of options that only a Super Admin can change, and a prospect described it to us as "very strongly typed," which was not a compliment. If the new CRM uses different stage names or options, every unmapped value either fails to sync or lands as blank. Map every option, not just the field.
Owners who do not match. Owners are usually matched by the user's email address. A rep whose HubSpot login is an old alias, or a contractor who never had a HubSpot seat, produces records with no owner on one side. List every user in both systems before the first sync.
Duplicates on day one. When both systems already hold the same companies and deals, the first sync has to match records rather than create them. Companies match well on domain, and contacts match on email. Deals are the risky ones, because two systems can each hold "Acme renewal" with different amounts, and no automatic rule knows which is right.
Associations and labels. A HubSpot partner we spoke to this summer listed what he thought most tools get wrong: multi-object associations, association labels, rollups, multi-currency, and field-level permissions. Check which of those your HubSpot portal uses before you assume the second system will carry them.
Email logged twice. If reps keep a HubSpot logging extension running and the new CRM also reads their mailboxes, both systems end up with a timeline, each missing different things. Choose one reader for the inbox.
How do you run the first month?
- Week one: sync in one direction only. Pull contacts, companies, and deals from HubSpot into the new CRM, and connect the reps' mailboxes and calendars there. Nothing writes back to HubSpot yet, so any mistake stays on the new side.
- Week two: check the mapping on twenty records. Pick twenty deals across stages and owners and compare them field by field. Fix picklist values, owners, and stage names now, while the mistakes are still one-way.
- Week three: turn on the direction back into HubSpot. Start with the fields the new CRM owns: stage, amount, close date, next step. Switch off any HubSpot workflow that writes to those fields.
- Week four: look for drift. Compare a HubSpot pipeline report against the new CRM's pipeline. Differences point to a field with two owners or a value that never mapped. Then decide whether this is the permanent setup or the first step of a switch.
An illustrative example, with numbers made up to show the shape. An eight-seat team keeps HubSpot because the parent group reports from it. In week one, 3,400 contacts, 900 companies, and 210 open and recent deals come across, and the mailboxes add email history to 170 of those deals. The week-two check finds two problems: three reps have different emails in the two systems, and HubSpot's deal stage "Contract sent" has no match in the new pipeline. Both are fixed in an afternoon. In week three, one HubSpot workflow that reset the close date whenever the amount changed gets switched off. By week four the two pipeline reports agree within two deals, and the group's Monday report comes out of HubSpot as usual, with stages the reps never typed into HubSpot at all.
When should you switch fully instead?
When the reason for keeping HubSpot goes away. The mandate ends, marketing moves, or the one workflow that mattered gets rebuilt. At that point the parallel month has already done most of the hard work, because the new system holds the activity history and the records are matched. What remains is the export question and the contract date, and the leaving HubSpot page covers both.
What to look for in a tool
Most vendors will say they integrate with HubSpot. The questions that separate a real sync from an import button are these:
- Is it two-way, and can you choose the direction for each connection, so you can start one-way and open the other side later?
- Can you map fields per object, including every picklist option, and see which records failed to sync and why?
- How does it match owners and existing records on the first sync, and what happens to deals that already exist on both sides?
- Does a deletion on one side delete the record on the other, and can you control that?
Ahoy syncs with HubSpot in both directions for contacts, companies, deals, and the links between them, with the direction set per connection (both ways, into our CRM only, or out to HubSpot only) and field and stage mappings per object. Owners are matched by email, a deletion in our system is not pushed to HubSpot unless you turn that on, and if deals already exist on our side when HubSpot is connected, the deal import waits for an admin to choose between importing and skipping. Sellers work from the captured inbox and approve proposed updates with one tap; HubSpot keeps receiving the result. Our HubSpot comparison covers where the two products differ, and the free HubSpot audit looks at your portal with you before anything is connected.
Frequently asked questions
Can you use an AI CRM and HubSpot at the same time?
Yes. The usual setup keeps HubSpot as the system of record that the company reports from, runs the AI-native CRM as the place sellers work, and connects the two with a two-way sync for contacts, companies, and deals. It works well as long as each field has one owning system, written down before the sync is switched on.
What does two-way sync between CRMs mean?
A change made in either system is copied to the other: a new contact in HubSpot appears in the second CRM, and a stage change made by a seller in the second CRM appears on the HubSpot deal. Good sync tools also let you set the direction per connection, so you can start one-way into the new system and turn on the other direction once the field mapping has been checked.
Which system should own the deal stage?
The one your sellers actually work in. If reps update deals in the AI-native CRM, that system owns stage, amount, close date, and next step, and HubSpot receives them. Letting both systems edit the stage produces changes that bounce back and forth, and nobody can tell which value is the real one.
Will syncing two CRMs create duplicate contacts?
It can, most often on day one. If both systems already hold the same people and companies, the first sync has to match them rather than create them twice. Clean duplicates in HubSpot first, match companies on domain and contacts on email, and check a sample of the matches by hand before turning on the direction that writes back into HubSpot.
Should email activity be logged in both CRMs?
No. Pick one system to read the inboxes and calendars. If a HubSpot logging extension and an AI-native CRM both capture the same threads, you end up with two versions of the timeline and arguments about which one is complete. Most teams let the AI-native CRM capture activity and keep HubSpot for records and reporting.
Related guides: How do you switch CRMs before your renewal date? · What transfers when you leave HubSpot? · How do you stop logging CRM activity by hand? · Leaving HubSpot? When to switch · All guides