If your technicians travel to sites and the work they do is maintenance on assets you are accountable for, you need both. Field service management schedules and dispatches the people. A CMMS records the assets, their maintenance history and their compliance status. Buy them separately and you maintain two asset lists, two work order queues and a manual reconciliation between them.
FSM answers "who is going where, when, and did the job get done". Job creation, technician scheduling by skill and location, route and dispatch, mobile execution with photos and signatures, SLA tracking, customer sites and contracts.
A CMMS answers "what do we own, what condition is it in, and what has been done to it". Asset registers and hierarchies, preventive maintenance schedules by time or meter reading, work order history per asset, parts and spares inventory, inspection checklists and compliance records.
FieldEx was built as a single system across both. The same asset record drives the preventive maintenance schedule, the work order and the technician's mobile job, so the service history accumulates as a by-product of the work getting done rather than as a separate data-entry task.
Managers and schedulers work in the web console; technicians work in the mobile app.
Plans start at $10 per user per month billed annually.
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