You Can Build Tools for Managing HubSpot Integration Migrations

Integrations can remain in place after support ends

HubSpot announced on September 15, 2026, that it will end support for legacy integration rules and app architecture from September 2027. The rules that let software systems exchange data are commonly called APIs, or application programming interfaces. This change covers URL patterns containing /v1/, /v2/, or /v3/.

Legacy public apps and private apps must also move to the new app architecture. Public apps created before June 23, 2026 are classified as legacy. Private apps can no longer be newly created in new accounts from September 28, 2026, and in existing accounts from October 26.

The schedule for /v4/ is earlier. HubSpot’s official change log says support ends on March 30, 2027, so a higher version number should not be treated as proof that an approach is newer.

End of support does not mean every integration will be blocked immediately. But bug fixes, stability improvements, and security updates can no longer be expected. If form submissions or customer-record updates become unreliable one day, there is little reason to remain on the old approach.

Documentation for replacement paths for all legacy API endpoints is expected in March 2027. That leaves a little more than six months to prepare for the actual migration deadline. HubSpot also says it identifies affected apps based on calls that actually ran, rather than only code that has been stored.

The break happens between work systems, not only in code

Consider Park Ji-hyun, the virtual operations lead at a corporate training company with 12 employees. The company sends website consultation requests into HubSpot and connects it with a training schedule, an email tool, and contract-management software.

To find legacy integrations today, Park first opens HubSpot’s connected apps screen and copies the app name, installer, and owner into a document. Next, Park downloads recent call logs from the developer-management screen and asks the development agency whether request URLs contain /v1/ through /v4/.

The work breaks here. The app name in HubSpot, the URL in the downloaded call log, and the software name held by the agency may all differ. Park has to manually match three lists.

A missing recent call does not necessarily mean an integration is unused. Public-app call logs available for download from HubSpot cover up to 30 days at a time. Workflows that run at month-end or quarterly require checking server logs and asking external vendors again.

Once migration begins, the work moves into a task-management tool. Park writes down the sequence from website inquiry to email subscription, sales-owner assignment, and contract-completion notification. After the agency creates the new integration, Park compares customer counts, consultation stages, and recent notes before and after the migration.

A management tool changes this flow. When users upload the connected-app list and call-log files, it can group the app name, owner, last-used time, and legacy-URL status on one screen. It can also show first the integrations where a stop at the front, such as a website inquiry, also stops downstream email and sales assignment.

The tool does not need to perform the migration itself. People still need to decide whether customer notes moved with the same meaning, submit a real inquiry to confirm the email and owner assignment, and choose when to turn off the old integration.

Migration and verification are sold separately elsewhere

Sendoso, a US corporate gifting service, published an example of moving its legacy HubSpot app to the new app architecture. It combined the existing app and new-screen functions into one unit of work and operates it to handle about 1,500 HubSpot contacts a day.

Sendoso did not publish a separate price for the migration work. According to the company’s own announcement, its deployment cycle changed from once a week to several times a day, and monthly gifting in HubSpot increased by 30%. Those self-reported figures need separate verification.

Origo in Iceland created a new HubSpot account with MigrateMyCRM as part of an organisational separation. It selected 249,000 needed records from 1.3 million total records, then moved 12 types of information and records from two systems over about two months.

MigrateMyCRM charges based on the number of records to move and the scope of support. Public self-service pricing starts at about KRW 410,000 and goes to KRW 4.14 million. Expert guidance adds about KRW 1.04 million, while custom work starts at about KRW 3.45 million, though costs vary by exchange rate and scope.

Four things you could build here

1. A legacy-integration discovery dashboard

• What it does: Takes an app list and recent call logs, then shows legacy URLs, last-used time, and missing owners in one place.
• Who uses it: A Korea-based operations agency that manages HubSpot accounts for multiple clients but keeps integration details only in documents.
• Why now: Teams need to inspect actual execution records to judge impact, and must migrate app architecture and integration URLs separately.
• First screen: Shows red, yellow, and green cards for each client: affected-app count, legacy-call count, and integrations without an owner.

2. A migration sequence and handover board

• What it does: Tracks the owner, external vendor, prerequisite work, test date, and old-integration shutoff date for each integration.
• Who uses it: A training company where a website agency, marketing agency, and in-house operations staff each own part of the HubSpot integration setup.
• Why now: Both app architecture and integration URLs must change, so a claim that one side has finished is not enough to call the migration complete.
• First screen: Places the sequence from website inquiry through customer registration and email sending as arrows, then marks blocked work and vendors whose responses are pending.

3. A before-and-after customer-data comparer

• What it does: Compares two files exported before and after migration to find missing customers, changed owners, blank consultation stages, and duplicate records.
• Who uses it: A sales-operations manager at a business-software company with tens of thousands of customer records but no separate IT team to verify them.
• Why now: Changing only a URL to the new approach can change the shape of returned data, so connection success and data consistency need separate checks.
• First screen: Shows total record counts before and after migration and the mismatches, then lets users immediately download the first 20 customer records for human review.

4. An alert tool for stopped automated work

• What it does: Watches whether inquiry intake and customer updates arrive at their usual pace, then alerts the business owner when they stop.
• Who uses it: The customer-support team of an online education service where website inquiries flow through HubSpot into support tickets and notification emails.
• Why now: An integration that has lost support may still work today, but its stability is no longer assured. Finding an error only after a customer reports it is too late.
• First screen: Shows the last successful processing time, normal processing interval, the next work affected after a stoppage, and the person to contact.

What to check in 30 minutes today

Open HubSpot’s developer-management screen and the connected apps screen in settings. For one integration that matters to your work, write its app name, owner, last execution time, and request URL on one line. If you cannot fill in all four within 30 minutes, or need to consult different screens and vendors, it is worth starting with a discovery tool that connects the integration inventory to execution records.

Why this matters where you are

Check whether the software platforms you use identify affected integrations from actual usage records, or only from code and configuration. Your market may have different platform deadlines and vendors, but the operational gap can be the same: app inventories, call logs, external providers, and data checks live in separate places. A small tool can begin by bringing those records together before attempting to automate the migration itself.