Custom CRM development for the sales process your team actually runs
Hashlogics builds custom CRMs. It runs SalesCrew, its own sales CRM, so it knows when a custom CRM pays and when to extend Salesforce.
- 4.8 on Clutch across 22 reviews
- PremiumAudit.io: audit cycle cut 75%, calculation errors cut 95%
- In production for SmartREI, Tankaware, ZyloBase, KiwiWrite
Hashlogics provides custom CRM development services. It built and runs SalesCrew, its own sales CRM, and helped build ZyloBase's field-service CRM. So it knows when a custom build is worth the effort. A custom CRM pays off when the record your business runs on isn't a standard deal. It also pays off when your CRM has grown into scheduling, invoicing or field work. If your process is a standard sales pipeline, Salesforce or HubSpot already ships it, and buying is the better call.
When does a custom CRM beat Salesforce or HubSpot?
Packaged CRMs handle the standard sales pipeline well. Salesforce's Starter Suite lists lead, account, contact and opportunity management, and says its AI syncs emails, events and contacts. Salesforce prices Sales Cloud per user per month, and each higher plan adds more automation, integration and customization.
Both tools let you add records of your own. Salesforce's Trailhead describes custom objects as objects you create to store information specific to your company or industry. HubSpot lists custom objects on Enterprise subscriptions and says there are limits on how many you can have.
So the record alone does not decide it. Ask what work hangs off that record. If it's a deal moving through stages, buy. Your core record might be a property or a job that also has to be scheduled, routed, invoiced and worked offline. Then a custom CRM can carry that work on the same record.
For the full buy-or-build checklist, read our Salesforce comparison. Real estate teams weighing a funnel tool can start with the GoHighLevel comparison.
- 01Choose a custom build when your core record, such as a property or a route, also carries scheduling, routing, invoicing or offline work.
- 02Run both when the split is clean: a packaged CRM for sales or marketing, a custom system for operations, and contacts synced between them.
What we have shipped
From our published work
40+
published case studies
<15s
to log a door knock in ZyloBase, the field-service CRM we helped build
ZyloBase-published product benchmark, 2026 (client-reported)
Which CRMs have we built or helped build?
Four CRMs, each built around a different core record.
A sales CRM your AI assistant can work in
SalesCrew is the sales CRM we built and run ourselves, and our own sales team works in it every day. Deals sit on a kanban with a weighted forecast. Cadences send from a pool of mailboxes under daily caps, and a reply pauses the cadence for that contact.
Read the SalesCrew case study →
A field-service CRM built on the property
ZyloBase keeps service history on the address, so it survives when a customer moves. A rep logs a door knock from a phone, and an interested property becomes a recurring route in one step. Hashlogics helped build it.
Read the ZyloBase case study →
A CRM that runs the whole operation
Maidily puts scheduling, CRM, invoicing, payments and messaging in one place for cleaning businesses, with Stripe, Square, Twilio and QuickBooks wired in. Hashlogics helped build it, and Maidily reported 75% fewer no-shows (client-reported).
Read the Maidily case study →
A client CRM inside a freelancer's back office
Golancer gives freelancers and small agencies a client CRM next to projects, Stripe invoicing and a public booking page. We built it on Bubble, with Google Calendar syncing both ways.
Read the Golancer case study →
What goes into the data model, pipeline and roles?
Your data model decides what the CRM can answer two years from now, so we settle it first. Out of the box, a sales CRM hangs history on the contact or account. ZyloBase keeps it on the property instead, because a house keeps its service history when the people in it move.
Your pipeline comes next: the stages, what moves a deal from one to the next, and what the forecast weighs. In SalesCrew, each deal sits on a kanban with stages, a win probability and a weighted forecast.
Roles decide who can see and change what. In SalesCrew, a login carries three scopes: channel, profile and area. Any MCP token a person issues carries the same three, so an assistant reaches only what its owner can reach. If you're an enterprise or an agency keeping clients apart, roles aren't enough on their own. Each SalesCrew client runs on its own Supabase stack, with a separate Postgres database.
If you're a startup, the CRM may be the product you sell, as it is for ZyloBase and Maidily. Then the same decisions carry your roadmap. We write them down in the Blueprint, so anyone joining your engineering team later can read why the model looks the way it does.
- ScopeFree scoping call. What is your core record?
- BlueprintFixed-fee plan, credited in full against the build.
- ModelRecords, stages and roles, agreed in writing.
- MigrateOld records mapped, merged and test-loaded.
- SyncMailboxes and calendars connected.
- LaunchAccepted against written criteria.
Seven stations, in this order. Migration comes before launch, so your team opens the new CRM with its history already inside it.
How does a custom CRM sync with Gmail and Microsoft 365?
If your mail sits with Google or Microsoft, email sync comes with their rules attached. We plan for those rules in the Blueprint, before any sync code gets written.
Google lists reading Gmail (the gmail.readonly scope) among its restricted scopes. Its documentation says an app that stores or transmits restricted-scope data on its servers must go through a security assessment.
Outlook mail runs through Microsoft Graph. There, a delta query keeps a local copy of a user's messages in step without fetching the whole mailbox every time. Microsoft notes that delta query works per folder, so each folder you sync is tracked on its own.
In SalesCrew, one inbox covers every connected mailbox across Gmail, Outlook and IMAP/SMTP. Replies are sorted by rule before a rep opens them, and a reply pauses the cadence for that contact.
How do you move off Salesforce, HubSpot or a spreadsheet?
A migration moves your history, so we plan it as its own milestone. We map each field and record type from the old system to the new data model. Then we merge duplicates and test-load a copy before anything goes live.
Check what your current CRM's export actually holds. HubSpot's record export downloads current property values and associations. Its help page points to separate routes for contact activities such as calls and notes, so those need their own step in the plan.
You don't have to switch everything off on day one. Your old CRM can stay open while your team checks the new one. Some teams keep it for good, with Salesforce or HubSpot for the sales motion and a custom system for operations.
Can AI work inside your CRM, and who approves what it writes?
MCP (Model Context Protocol) is an open-source standard for connecting AI applications to external systems. In SalesCrew, each action a rep takes on screen is also an MCP tool with the same effect. Claude, ChatGPT, Cursor or a custom agent can then move a deal, draft a reply or add a note.
Reading and writing get different rules. An assistant that only reads can summarise a deal or pull channel numbers, and it changes nothing. An assistant that writes, by moving a stage or adding a note, acts under its owner's scopes. The audit log records who acted, down to the token or agent.
You decide where a person signs off before an AI message reaches a customer. In SalesCrew, a reply drafted by the inbox agent waits in an approval queue by default until you approve or reject it. One kill switch stops every agent.
If your CRM sends records to an AI model, that provider's own terms decide whether they train on it. OpenAI says data sent to its API is not used to train its models unless you opt in. Anthropic's commercial terms say it may not train models on customer content from its services. These are the API and commercial terms. Consumer plans have their own settings, which we check with you before a rep connects one. On Claude Free, Pro and Max, Anthropic says you choose whether chats are used to improve Claude.
What do we build CRMs on?
Core
- React
- TypeScript
- Supabase
- PostgreSQL
- Edge functions
- Vercel
- Bubble
Email and calendar
- Gmail
- Outlook
- IMAP/SMTP
- Google Calendar
- Calendly
Payments, phone and accounting
- Stripe
- Square
- Twilio
- QuickBooks
AI over MCP
- Claude
- ChatGPT
- Cursor
- Custom MCP agents
- Salesforce
- Apollo
- Instantly
- Upwork
- GA4
- Google Ads
- Meta Ads
- PostHog
- or the systems you already run
Tell us what your CRM has to hold
A free scoping call with a senior engineer, then a fixed-fee Blueprint credited in full against the build. Every build comes with the first 2 months of maintenance.
“They were incredibly responsive.”
Mony · CEO, Maidily
What should you get in writing from a CRM developer?
ScienceSoft's CRM page lists an integration plan and user support. Saigon Technology's lists data migration from an older CRM. These questions show how one proposal differs from the next.
Core record
Ask this
Which record sits at the centre of the data model, and why?
How we answer it
Named in the Blueprint, before any screen gets designed.
Email sync
Ask this
Which mail providers sync, and how is Google's security assessment for restricted scopes handled?
How we answer it
Gmail, Outlook and IMAP/SMTP, as in SalesCrew. We plan the assessment step in the Blueprint.
Migration
Ask this
What moves across, what stays behind, and how is it checked?
How we answer it
A field-by-field map, duplicates merged, and a test load you sign off before launch.
AI access
Ask this
What can an AI assistant read, and what can it change?
How we answer it
Reads and writes listed apart. Writes run under the owner's scopes and land in the audit log.
Ownership
Ask this
Who owns the code, the database and the data?
How we answer it
You do: the code, the models and the data.
After launch
Ask this
Who fixes it when a mail provider or partner changes an API?
How we answer it
We do: 2 months of maintenance come included, then an SLA or a trained handover.
Price
Ask this
Is the price fixed before the build starts?
How we answer it
Yes. Your Blueprint sets a fixed price for each milestone, and its fee is credited in full against the build.
Questions buyers ask us first
01What is custom CRM development?+
Custom CRM development is building a CRM around the record your business runs on, instead of renting a standard one. You get your own data model, pipeline stages, roles and email sync, plus your old records moved across. Hashlogics built and runs SalesCrew, its own sales CRM, so the build follows a system we use every day.
02Custom CRM or Salesforce?+
Use Salesforce or HubSpot if your process is a standard sales pipeline and someone can own its setup. Build a custom CRM when your core record isn't a standard deal, or when the CRM has become your scheduling, invoicing or field system. Some teams run both, with contacts synced between them.
03How much does it cost to hire a custom CRM development company?+
There is no honest number before an engineer reads your systems, so we start with a free scoping call. Every build then starts with a Blueprint: a fixed-fee plan an engineer writes from your real systems, with scope, architecture, risks and a fixed price for each milestone. The fee is credited in full against the build. If the Blueprint doesn't give you a plan you'd act on, you don't pay for it.
04Can you migrate our data from HubSpot or Salesforce?+
Yes. We map each field and record type to the new data model, merge duplicates and test-load a copy before launch. Check what your export holds first. HubSpot's record export downloads current property values and associations, and its help page lists separate routes for activities such as calls and notes.
05Can a custom CRM sync with Gmail and Outlook?+
Yes. SalesCrew brings Gmail, Outlook and IMAP/SMTP mailboxes into one inbox. Reading Gmail is a restricted scope. Google requires a security assessment when an app stores or transmits that data on its servers, so we plan that step in the Blueprint.
06Can AI agents work inside a custom CRM?+
Yes, through MCP, an open-source standard for connecting AI applications to external systems. In SalesCrew each on-screen action is also an MCP tool. An assistant that only reads changes nothing. One that writes acts under its owner's scopes, its actions land in the audit log, and drafted replies wait in an approval queue by default.
07Will our CRM data be used to train AI models?+
Not under the API terms of the main providers, and we check each provider's terms with you before choosing one. OpenAI says data sent to its API is not used to train its models unless you opt in. Anthropic's commercial terms say it may not train models on customer content from its services. These are the API and commercial terms. Consumer plans have their own settings, which we check with you before a rep connects one. On Claude Free, Pro and Max, Anthropic says you choose whether chats are used to improve Claude.
08Who owns the CRM code?+
You own the code, the models and the data, so your own engineers can take the system over whenever you choose. Or we keep running it under an SLA.
09What happens after launch?+
Every build includes the first 2 months of maintenance. After that you choose an SLA with written service levels, or a trained handover to your own team. A month where we miss the written service levels is a month you don't pay for.
10Do you build CRMs for startups as well as enterprises?+
Yes. For a startup the CRM can be the product itself, as it is for ZyloBase and Maidily. An enterprise build turns on roles, data isolation and the audit trail. Each SalesCrew client gets its own Postgres database, and its audit log records who acted, down to the token or agent.
Related
- Custom CRM vs Salesforce →Salesforce against a build, for teams whose CRM runs operations.
- GoHighLevel vs a custom CRM →GoHighLevel's funnels against a build, for real estate.
- Best custom CRM development companies →Seven US-based firms, ranked by who each one fits.
- How to connect an AI agent to your CRM →Service accounts, scoped fields and a human gate.
- AI-native CRM: what it means →Agents that act, with an approval queue in front.
- Custom software development →Where a CRM build sits in our wider software work.
- API integration →Connecting your CRM to the systems around it.
- Software maintenance →What happens after the first 2 months.
- SalesCrew case study →Our own sales CRM, built and run in-house.
- ZyloBase case study →A field-service CRM built on the property record.
