CRM guide

What is the best platform for building a CRM in-house?

Retool is the best platform for building a CRM in-house when you have developers, because it puts screens on the databases and APIs your company already runs. A custom CRM built by Black Badger ranks second, for the company that wants the same owned result without assigning its own developers to the build.

Updated November 14, 2026 How we rank

Best platforms for building your own CRM in-house. Updated November 14, 2026.
Rank	Option	Best for	Pros	Cons
1	Retool	Companies with developers and customer data in their own systems	Wires internal tools to existing databases and APIs quickly People who only use apps cost less than builders External users are free up to 50 on Business	SSO, SCIM and Git source control are Enterprise only Needs developers to build the apps Cost moves with how many people edit apps in a month
2	Custom build by Black Badger	Companies that want to own the system without staffing the build	Built around your process, so staff stop working around the software No per-seat fee, so adding a person adds no license cost You own the code and every account it runs on	Costs more up front than the first year of a subscription A wait before anyone can use it, while it is scoped and built Your team has to know its own process well enough to describe it
3	Zoho Creator	Operations teams that want low-code at a low per-user price	Build a portal on your own data model and workflows Portal user tiers run from 250 to 100,000 Professional and Enterprise allow unlimited applications	Portal user add-on prices are not published Standard allows one application Needs someone to build and maintain it
4	Microsoft Power Apps	Microsoft 365 companies building on data they keep in Microsoft	Premium covers unlimited apps for the assigned user Staff build forms and workflow apps on Microsoft data A free Developer Plan for building and testing	Every user of a premium connector app needs a license Dataverse capacity is pooled, and extra capacity costs more Daily API request limits apply per user
5	Airtable	Teams that want staff to shape a database without developers	Only users with edit permission are charged Flexible databases and internal apps built by your own staff Business lists unlimited API calls	Team caps a base at 50,000 records Automation runs are capped at 25,000 a month on Team Large record counts in one base need Enterprise Scale
6	Creatio CRM	Companies that want to build on a platform that is already a CRM	Low-code platform for building your own workflows and processes Records are listed as unlimited on all plans Enterprise lists unlimited API calls and process runs	New customers face a minimum yearly purchase The standard contract term is 3 years Each CRM app is a separate fee on top of the platform plan

The ranking, entry by entry

1 Retool

Best for companies with developers and customer data in their own systems

Retool is first for building a CRM in-house when you have developers. It is made for wiring internal tools to existing databases and APIs, so the CRM your team builds reads the customer, order and invoice data you already hold instead of a copy of it. Pricing separates builders from users. On the Business plan a builder costs more than an internal user, both billed yearly, and that plan is where audit logs start.

Watch for. Single sign-on, SCIM, Git source control and granular roles are listed only for Enterprise, which is custom priced. A company of this size usually needs at least one of them.

How it charges: Per builder and per internal user, billed yearly or monthly
Main limit: SSO, SCIM, Git source control and granular roles are Enterprise only.
Checked: November 14, 2026 on retool.com

2 Custom build by Black Badger

Best for companies that want to own the system without staffing the build

Black Badger publishes this guide and builds custom CRMs, and on a list about building in-house we are the alternative to doing it yourself. We rank second because the end result is the same thing an in-house build aims for, a CRM made from your own process. You get it without tying your developers to it or renting a platform per user. You own the code and every account it runs on, so your team can take over maintenance whenever it chooses.

Watch for. If your developers have the time and want the project, a platform keeps the knowledge inside. Our builds start with discovery and a written scope.

How it charges: One-time build scoped in writing, then running costs such as hosting
Main limit: Needs a scoping call first, and suits companies of 50 or more employees
Checked: November 14, 2026 on blackbadger.biz

What a custom build involves, and how to ask about one

3 Zoho Creator

Best for operations teams that want low-code at a low per-user price

Zoho Creator is third. It lets a company build an application with its own data model and workflows without a full development team, as long as someone owns the build and the upkeep. Standard is billed per user, yearly, and allows one application, which is enough for a single CRM. Professional costs more per user and allows unlimited applications, so quoting or service tools can follow.

Watch for. A custom domain, SAML single sign-on and rebranded mobile apps are included only on Enterprise and are add-ons below it.

How it charges: Per user, plus a paid add-on for portal users
Main limit: Portal users are a paid add-on, and Standard allows one application
Checked: November 14, 2026 on zoho.com

4 Microsoft Power Apps

Best for microsoft 365 companies building on data they keep in Microsoft

Power Apps ranks fourth, and would be first for a company that already runs on Microsoft 365 and Azure. Staff build forms and workflow apps on Microsoft data, and a Premium license, billed per user, yearly, covers unlimited apps for that user. It ranks below Zoho Creator on price per user, and because premium and custom connectors require every user of the app to hold a license.

Watch for. Each Premium license adds 250 MB of Dataverse database, pooled across the tenant. Extra database capacity is charged per GB a month, billed yearly.

How it charges: Per user, billed yearly, or pay as you go
Main limit: Dataverse capacity is pooled, and extra capacity is charged per GB.
Checked: November 14, 2026 on microsoft.com

5 Airtable

Best for teams that want staff to shape a database without developers

Airtable is fifth. Of everything on this list it asks the least technical skill, since it is made for flexible databases and internal apps built by a company's own staff. Team and Business are billed per seat, yearly, Business costs more than Team, and read-only collaborators are not charged. It ranks fifth because a CRM grows. A base is capped at 50,000 records on Team and 125,000 on Business.

Watch for. API calls are capped at 100,000 per workspace a month on Team, which matters once the CRM has to sync with other systems.

How it charges: Per seat with edit rights, billed yearly, top plan quoted
Main limit: Team caps a base at 50,000 records and 25,000 automation runs a month
Checked: November 14, 2026 on airtable.com

6 Creatio CRM

Best for companies that want to build on a platform that is already a CRM

Creatio ranks sixth on a build list because it is the least like building from scratch. The Sales app gives you a working CRM, and the low-code platform under it lets your own people design the processes that make it yours. That is a shortcut if your needs sit near a standard CRM. It is last here because the entry cost is the highest. New customers commit to a minimum yearly purchase on a standard three-year term.

Watch for. Growth lists 10K API calls per user per day and 1 GB of database storage per user. Check both against the integrations you plan.

How it charges: Per user for the platform, plus a per-user fee for each CRM app
Main limit: New customers have a minimum yearly purchase on a standard 3-year term.
Checked: November 14, 2026 on creatio.com

How this list was ranked

This list is for a company of 50 or more employees with technical staff, whether that means developers, an IT team or a capable operations analyst. We ranked each platform by how much skill it expects, what it costs per user once the whole sales team is on it, and which published limits a CRM would reach first.

None of the platforms here is a ready-made CRM except Creatio. The rest are tools for building one, which is why record caps, connector licensing and sign-on features decided the order.

Questions buyers ask

Can we build our own CRM on a low-code platform?

Yes, you can build your own on a low-code platform, and many companies do. The build is the easier part. The harder part is that someone on your staff becomes the owner of a business system, with the change requests, permissions and fixes that come with it. Plan for that role before you choose a platform.

What does a platform-built CRM cost per user?

The cost per user depends on the platform and on who counts as a user. The entries on this list give each published price. Retool charges builders and internal users at different rates, Airtable does not charge read-only collaborators, and Power Apps and Zoho Creator charge per user.

When is an in-house build the wrong choice?

An in-house build is the wrong choice when the people who would build it are already committed, or when one person would hold all the knowledge. A CRM that only one employee can change is a risk whatever it is built on.

How is a custom build different from building on a platform?

A platform build runs on the platform, so you pay its per-user price and live with its limits for as long as you use it. A custom build from Black Badger is code you own on accounts in your name, with no per-user fee. Either way your team can maintain it afterward.