Custom maintenance planning tool vs CMMS add-on: which fits your shutdowns?
Use the planning add-on for your CMMS when routine preventive work and weekly schedules are the job. Build a custom maintenance planning tool when shutdowns and turnarounds need your own job scoring, contractor crews, permits and scenarios, while the CMMS stays the record of assets and work orders.
Should you build a custom maintenance planning tool or use a CMMS add-on?
Quick answer
A CMMS add-on suits planning that looks like everyday maintenance: preventive work, weekly schedules and the CMMS data model. A custom maintenance planning tool suits shutdowns, where every job is scored, sequenced around permits and contractors and changed daily. In most plants the custom tool sits beside the CMMS rather than replacing it.
| Criterion | CMMS add-on | Custom planning tool |
|---|---|---|
| Best fit | Routine preventive and corrective maintenance | Shutdowns, turnarounds and outages with a fixed window |
| Job scoring | Priority fields the CMMS provides | Your own scoring by risk, cost, duration and production impact |
| Sequencing | Schedules by crew and date | Sequences jobs around permits, lockout, scaffolding and shared equipment |
| Contractors | Usually limited to users with CMMS licences | Contractor views and updates without full CMMS access |
| Scenarios | Few or none; one schedule at a time | What-if plans when the window shortens or new jobs appear |
| Data model | The CMMS data model as shipped | Your planning data, linked to CMMS asset and work order IDs |
| Upgrades | Follows the CMMS vendor's release cycle | Changes when your planning process changes |
| Cost shape | Licence or module fee added to the CMMS | Build cost up front, then hosting and support |
What is each option?
What is CMMS add-on
A CMMS add-on is a planning or scheduling module sold for the CMMS you already run, or an extension built on its platform. It works on the CMMS's own work orders, assets and labor records, inside the screens and rules the CMMS vendor provides.
What is Custom planning tool
A custom maintenance planning tool is software built for how your plant plans shutdowns and turnarounds. Agnotic Technologies builds it to read the backlog from your CMMS, score and sequence jobs with your rules, and send approved work packages back as work orders.
Where do the two options differ most?
Which system keeps the maintenance record?
In both cases the CMMS should stay the record of assets, work orders and history. A custom planning tool holds planning data, such as scores, sequences and scenarios, and writes approved work back to the CMMS so nothing is planned in two places.
How are lockout steps planned?
Shutdown jobs often depend on energy isolation. The OSHA lockout/tagout standard requires a periodic inspection of each energy control procedure at least annually, certified with the machine, the date, the employees included and the inspector (29 CFR 1910.147(c)(6)). A custom tool can sequence jobs around those procedures.
What inspection records must the plan produce?
In processes covered by OSHA process safety management, each inspection and test on process equipment must be documented with its date, the person who performed it, the equipment identifier, a description of the test and the results (29 CFR 1910.119(j)(4)(iv)). Planned shutdown jobs should close out with that record.
How does each option fit asset management standards?
ISO 55001:2024 specifies requirements for an asset management system, while ISO 55000 gives the overview and terminology and ISO 55002 gives guidance on applying the requirements. Neither option makes a plant conform; both have to keep the asset data and decisions that the system relies on.
Where does each option fail?
A CMMS add-on fails when planners export to spreadsheets because it cannot score or sequence shutdown work. A custom tool fails when it keeps its own copy of work orders that drifts from the CMMS, or when it is built without the planners who will use it.
When does each option fit?
When to use A CMMS add-on
- Most planned work is preventive maintenance on fixed intervals.
- Weekly schedules for in-house crews are the main planning job.
- Your planners already work in the CMMS all day.
- Shutdowns are small enough to plan as a list of ordinary work orders.
When to use A custom maintenance planning tool
- Shutdown and turnaround jobs need scoring by risk, cost and duration before they are approved.
- Contractor crews, permits and lockout steps must be sequenced together.
- Planners need what-if scenarios when the shutdown window or scope changes.
- Plans currently live in spreadsheets kept by one experienced planner.
How does a custom planning tool work alongside the CMMS?
1. The CMMS stays the source of assets, the work order backlog and maintenance history.
2. The planning tool reads the backlog and the jobs raised for the shutdown through the CMMS API or a scheduled export.
3. Planners score each job, group jobs into work packages and sequence them around permits, lockout steps and contractor crews.
4. Approved packages are written back to the CMMS as work orders, so crews work from one list.
5. Close-out data, findings and new defects return to the CMMS history and feed the next shutdown's plan.
Shutdown planning with AI scoring is covered on our shutdown maintenance planning page, and the CMMS itself on our CMMS software page.