_LEDGER MODERNIZATION/

Retire the legacy ledger without betting the close

Move off Great Plains-era systems onto a programmable, API-first ledger: shadow-run both, prove they agree, then cut over with history intact.

Book a demo Start building

legacy GL

mapping

shadow ledger

cutover

_TRUSTED BY TEAMS MOVING MONEY/

_THE PROBLEM/

The ERP ledger was built for batches, not products

Rigid GL strings cannot power modern finance operations.

The legacy GL runs on rigid account strings, nightly batches, and screens your team works around. Every new workflow (a portal, an automation, real-time reporting) fights the system it depends on, and replacing it feels like open-heart surgery.

Rigid GL strings encode the org chart of a decade ago, and every change is a project.

The ledger is batch-based, so balances are yesterday's truth at best.

Building modern tools (portals, automations, dashboards) against the old ERP means screen-scraping and CSV exports.

Migration risk is existential: get it wrong and you cannot close the quarter.

_PROOF/ Enterprises replace legacy AR ledgers with Formance as the system of record, keeping the ERP for what it is good at.

_FLOW OF FUNDS/

Shadow first, then cut over

Both ledgers run until they agree; then the old one retires.

Live events stream into Formance while history migrates through a mapped bulk import. The shadow ledger reconciles against the legacy system until both agree on every balance; then you cut over, with the ERP consuming roll-ups downstream.

shadow reconciliation

legacy GLsystem of record today

mappingCoA translation

shadow ledgerboth run, reconciled

cutoverFormance is the record

_CAPABILITIES/

The primitives modernization needs

Built on the open-source Formance ledger.

A programmable chart of accounts, bulk migration tooling, and an API-first surface, composed for replacing legacy ledgers safely.

_FLEXIBLE CHART OF ACCOUNTS/

Replace rigid GL strings with a dimensional account structure designed around how the business works now, and change it when the business changes.

designed with you

_BULK MIGRATION/

History migrates through bulk endpoints at balance or transaction level, through an explicit mapping from the old chart to the new.

mapped, repeatable

Read the docs

_SHADOW RECONCILIATION/

Run Formance alongside the legacy ledger and reconcile them continuously: cut over only when both agree on everything.

prove before cutover

_API-FIRST SURFACE/

Every balance and posting available over API and events in real time: build the portals and automations the ERP never allowed.

build on top

_BY THE NUMBERS/

Modernization without the cliff

big-bang cutovers0shadow-run · then switch

history preserved100%balance or transaction level

balancesreal-timeAPI-first · event-driven

to first shadow runweeksmapped migration

_NUMSCRIPT/

The new ledger speaks your dimensions

GL strings become structured accounts you can query.

A legacy GL string like 100-B0313-AR becomes a structured, queryable account path: same meaning, real structure, and every roll-up derived instead of report-coded.

migrate.num

// Legacy GL string → structured account
// "100-B0313-AR"  becomes:
//   @platform:ar:company100:B0313

vars {
  monetary $opening_balance
}

// Opening balance posted from migration
send $opening_balance (
  source = @migration:gp-cutover
  destination = @platform:ar:company100:B0313
)

_VOICES/

Trusted by builders

“Formance enabled us to ship new lending products faster by providing a customizable foundation that let us reliably express the complexities of our flow of funds.”

Embedded finance · reconciliation across 14 countries

See customer story

“Formance is the foundation of our Financial OS, the open-source approach lets us retain control over this key component.”

Healthcare · Financial OS

“Formance helped us kick off our move into fintech, with robust infrastructure and intuitive developer tooling.”

Benefits · fintech infrastructure

_TRUST/

Built for regulated money.

Enterprise controls, the certifications auditors ask for, and an immutable record, out of the box.

See our trust center

THE COMPLIANCE STACK

IAM, RBAC & SSO

Non-repudiation

Audit logs

Observability & monitoring

Real-time events

Admin console

_AUDIT-LOG/ NON-REPUDIATION

09:41:07Z AUDIT gateway POST /api/ledger/v2/main/transactions 200 sub:ops@acme.io

09:41:09Z LOG id:4093 NEW_TRANSACTION ledger:main

09:41:12Z LOG id:4094 SET_METADATA ledger:main

09:41:15Z LOG id:4095 REVERTED_TRANSACTION ledger:main

09:41:18Z AUDIT gateway GET /api/ledger/v2/main/logs 200 sub:audit@acme.io

CERTIFICATIONS

AICPA SOC IICERTIFIED

ISO 27001CERTIFIED

DORACOMPLIANT

REGULATORY FRAMEWORKS

EMIFCAMTLNYDFS Trust CharterOCC CharterMiCAGENIUS

_ATTESTED/

_RESOURCES/

Keep going

Everything you need to evaluate and build on Formance.

_DOCS/

Read the documentation

Architecture guides, the Ledger and Connectivity references, and step-by-step quickstarts to ship in days.

_NUMSCRIPT/

Try Numscript

Model any flow of funds as deterministic, auditable transactions. Experiment live in the playground.

_STORIES/

Customer stories

See how fintechs, marketplaces and platforms run money movement on Formance in production.

FAQ

Modernization, answered

01 / DO WE REPLACE THE ERP ENTIRELY?

No: Formance becomes the operational system of record for money movement; the ERP keeps consuming roll-ups for statutory accounting. Each system does what it is good at.

02 / HOW DOES THE MIGRATION ACTUALLY RUN?

Chart of accounts first, then a mapping from the old structure, then bulk import, at balance level or full transaction history, while live events stream in parallel.

03 / WHAT IF THE TWO LEDGERS DISAGREE?

That is the point of the shadow run: continuous reconciliation surfaces every difference before cutover, so the switch happens on proof, not hope.

04 / CAN WE BUILD OUR OWN TOOLS ON TOP?

Yes: everything is API-first with real-time events, so AR portals, approval workflows, and dashboards build against the ledger directly.

_GET STARTED/

Modernize on proof, not hope

See how Formance fits your migration: book a demo or start building.

Book a demo Start building