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OneStream (EPM software) runs the close, consolidation and reporting of a multi-entity group. Abacum (FP&A software) runs the budgets and forecasts of a finance team that has outgrown its spreadsheets.
Official partner for both platforms

EPM software
The close, the consolidation, planning and reporting on 1 model.
Read the guide
FP&A software
Budgets, forecasts and scenarios for a team that has outgrown a workbook.
Read the pageWe compare the 2 on the shape of the finance function each one suits, because that is what decides between them.
| OneStream | Abacum | |
|---|---|---|
| Who it suits | A multi-entity group that closes and consolidates across several ledgers, usually with a legacy consolidation such as HFM or BPC to replace. | A finance team whose budget and forecast have outgrown a spreadsheet, and whose consolidation is already settled. |
| What it is for | The close, the consolidation, planning and reporting, all reading 1 data model. | Budgets, forecasts and scenarios. Abacum connects to more than 700 sources for the data coming in. |
| What it replaces | HFM, BPC or IBM Controller, plus the workbooks that grew up around them. | The budget workbook, the version emailed round the business and the model that 1 person can open. |
| Where it stops | A group with 1 entity and a straightforward close gets more platform than it needs. | Abacum is built for the plan, and OneStream runs the intercompany eliminations beside it. |
| What we bring to it | Constancia has delivered 58 OneStream implementations over 35 years. | Constancia's architects and consultants are certified on Abacum and based in the UK. |
The guide explains what OneStream (EPM software) does, what a finance team needs in place to run it and which group structures it suits.
Read the guideAbacum (FP&A software) gives a finance team its budgets, forecasts and scenarios in 1 model, and a typical build goes live in weeks.
Read the pageConstancia is a certified OneStream implementation partner based in the UK, and we test every source system's extract during the survey, before the contract is signed.
OneStream's pre-configured consolidation and close for a mid-market group, with the size of group it suits stated on the page.
OneStream's forecasting and agent features, which we switch on once the survey shows the model underneath can feed them.
Training for the finance team that will run OneStream after we leave, on your own model rather than a demonstration one.
Support for a live OneStream estate through every month end close and every platform release.
5 routes off Hyperion, SAP BPC, Oracle EPM, TM1 and Anaplan, each decided by how the old rules map onto the new model.
An Abacum build on drivers the business owns, which goes live in weeks and is handed back to the finance team.
Abacum's AI features, and what the planning model underneath needs before they produce a number finance can defend.
The connectors from NetSuite and the other source systems into Abacum, which we test in the survey rather than at tie-out.
Both partnerships are official, and our consultants are certified on both platforms.EPM consulting for a multi-entity groupSee the services
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