APIs · head to head
Formance vs Longhorn
Formance
APIs
Open source double-entry ledger and payment orchestration for money-moving software
- From
- Free
- Rated
- -
Longhorn
Cloud
Open source distributed block storage for Kubernetes, incubating at the CNCF
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Formance formance holds no money and provides no regulatory cover, so it must be paired with a payments provider or bank, and buyers occasionally mistake a ledger for a treasury system and discover the gap late.; Longhorn there is no vendor and no SLA, so a production incident at three in the morning is your own problem unless you buy SUSE Rancher Prime support separately.
- They diverge on capability: Formance covers Double-entry ledger, Longhorn covers Per-volume controllers.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Formance and Longhorn actually diverge.
Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Formance
- Double-entry ledger
- Numscript transaction DSL
- Multi-currency
- Payments connectivity
- Reconciliation
- Self-hosted deployment
- Cloud offering
- API and SDKs
Only in Longhorn
- Per-volume controllers
- Synchronous replication
- Snapshots and backups
- Volume expansion
- Disaster recovery volumes
- Web interface
What people use each for
The jobs each tool is most often brought in to do.
Formance
- A marketplace splitting a single customer payment between seller, platform fee and tax that needs the split to be atomic and auditablenot Longhorn
- A fintech whose homegrown balances table produced numbers finance could not reconcile and now needs proper double-entry before an auditnot Longhorn
- A payments team that wants one normalised model across several PSPs so reconciliation is not written separately for eachnot Longhorn
- A company that wants its ledger under a licence it can keep running even if the vendor disappearsnot Longhorn
Longhorn
- An on-premises Kubernetes cluster with local disks and no SAN that needs replicated persistent volumesnot Formance
- Edge sites where shipping a storage array is impractical and three nodes is the whole clusternot Formance
- A K3s deployment where the storage layer must be light enough to run alongside the workloadsnot Formance
- A team that wants snapshots and S3 backups of persistent volumes without paying per-node storage licencesnot Formance
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Formance
- Formance holds no money and provides no regulatory cover, so it must be paired with a payments provider or bank, and buyers occasionally mistake a ledger for a treasury system and discover the gap late.
- Numscript is a domain-specific language your team must learn, and while it makes complex splits expressible it also means transaction logic sits outside the languages your engineers already debug well.
- Self-hosting a ledger that must never lose or duplicate a transaction is a serious operational commitment covering backups, upgrades and Postgres tuning, which is real cost the zero licence fee hides.
- Enterprise pricing is not published, so the difference between the free path and the supported path cannot be evaluated without a sales conversation.
- The company is much smaller than the incumbent alternatives, and while the MIT licence protects the code it does not protect the roadmap, so features on the hosted side may arrive slowly or change direction.
Longhorn
- There is no vendor and no SLA, so a production incident at three in the morning is your own problem unless you buy SUSE Rancher Prime support separately.
- Synchronous replication across nodes means write latency depends on the slowest replica and the network between nodes, which makes it a poor fit for latency-sensitive databases.
- Every replica is a full copy, so three-way replication consumes three times the raw capacity, unlike erasure-coded systems that are far more space efficient.
- It is designed for block storage on modest clusters and does not scale to the node counts or throughput that Ceph or a commercial array handles, so growth eventually forces a migration.
- Recovery from certain degraded states, such as a volume stuck detaching or replicas failing to rebuild, requires manual intervention and knowledge of Longhorn internals that is not widely held.
Pricing, plan by plan
Formance
Free- Open SourceFree
- MIT licensed core ledger
- Numscript transaction DSL
- Multi-currency tracking
- Enterprise$undefined/year
- Managed or private deployment
- Payments connectivity and reconciliation
- Support with response commitments
Longhorn
Free- LonghornFree
- Apache 2.0 licensed, no licence fee
- Community support via GitHub and Slack only
- No vendor SLA or escalation path
Which should you pick?
Choose Formance if
- You need double-entry ledger.
- You want to start without paying.
- You work on Linux, Docker, Kubernetes, Web, API.
- You also want numscript transaction dsl.
Choose Longhorn if
- You need per-volume controllers.
- You want to start without paying.
- You work on Linux, Kubernetes.
- You also want synchronous replication.
Questions people ask
- Is Formance or Longhorn better?
- Neither clearly leads. Formance starts at Free and Longhorn at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Formance or Longhorn?
- Formance starts at Free and Longhorn at Free.
- Does Formance or Longhorn run on more platforms?
- Formance runs on Linux, Docker, Kubernetes, Web, API. Longhorn runs on Linux, Kubernetes.
- Can I use Formance for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Formance best used for?
- Formance is most often used for a marketplace splitting a single customer payment between seller, platform fee and tax that needs the split to be atomic and auditable, a fintech whose homegrown balances table produced numbers finance could not reconcile and now needs proper double-entry before an audit, a payments team that wants one normalised model across several psps so reconciliation is not written separately for each, a company that wants its ledger under a licence it can keep running even if the vendor disappears. Of those, a marketplace splitting a single customer payment between seller, platform fee and tax that needs the split to be atomic and auditable and a fintech whose homegrown balances table produced numbers finance could not reconcile and now needs proper double-entry before an audit are not what Longhorn is typically brought in for.
- What can Formance do that Longhorn cannot?
- Formance covers Double-entry ledger, Numscript transaction DSL, Multi-currency, Payments connectivity. Longhorn covers Per-volume controllers, Synchronous replication, Snapshots and backups, Volume expansion.
Answered from the vendors’ own pages
Formance: Is Formance really open source?
Yes. The core ledger is MIT licensed with full source access and no deployment restrictions.
Longhorn: Who do we call when it breaks?
Nobody, unless you buy SUSE Rancher Prime, which includes commercial support for Longhorn. This is the decisive question for production use.
Formance: Does Formance move money?
No. It records and orchestrates movements; the actual payments happen at a PSP or bank you connect.
Longhorn: How much capacity does replication cost?
Full copies, so three replicas means three times the raw capacity. Budget accordingly rather than assuming erasure coding efficiency.
Formance: What does the enterprise version cost?
Not published. It is an annual subscription quoted per customer.
Longhorn: Is it suitable for production databases?
For modest workloads yes, but synchronous replication adds write latency and high-transaction databases usually want something faster.
Formance: Do I have to use Numscript?
Yes for anything beyond the simplest transfers. It is how multi-party transactions are expressed atomically.
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- Longhorn vs Enable Banking
- Longhorn vs Flybits
- Longhorn vs i2c
- Longhorn vs KeystoneJS
- Longhorn vs Liveblocks
- Longhorn vs Portworx
- Longhorn vs OpenEBS
- Longhorn vs Proxmox VE
- Longhorn vs Anyscale
- Longhorn vs Go
- Longhorn vs Rancher
- Longhorn vs Packer
- Longhorn vs DeepInfra
- Longhorn vs Serverless Framework
- Longhorn vs Coolify
- Longhorn vs Puppet
- Longhorn vs Qovery
- Longhorn vs Porter
- Longhorn vs VictoriaMetrics
- Longhorn vs Vultr
- Longhorn vs Akamai
- Longhorn vs Vagrant