OneSchema alternative — explainable, self-hosted CSV import

Mildport is a self-hosted OneSchema alternative. It gives your users the same embeddable spreadsheet-import experience — upload, map, validate, fix, submit — but the engine runs in your infrastructure, and every mapping decision is explainable rather than opaque.

Teams comparing OneSchema are usually optimizing for one of two things: clean, validated rows reaching their backend, and control over where that data is processed. Mildport is built to give you both without a cloud round-trip.

OneSchema vs Mildport at a glance

	OneSchema (cloud)	Mildport (self-hosted)
Hosting	Vendor cloud	Your infrastructure (Docker Compose or Helm)
Data path	Through vendor cloud	Stays in your VPC
Validation	Rules-based, cloud-run	Typed contract + deterministic matcher, run in your env
Mapping transparency	Vendor-managed	Visible scores + replayable, event-sourced pipeline
Schema setup	Templates built by hand in the vendor dashboard	No-code editor embeddable in your own admin, or drafted from your API spec
AI assistance	Vendor AI	Optional evidence-gated judge, bring your own model, off by default
Data cleanup	Vendor AI transforms	Plain-language cleanups, previewed before apply, replayed free on similar files
Inputs	CSV / spreadsheets	CSV, TSV, XLSX, ODS, JSON, XML, PDF tables, OCR’d scans
Delivery	Vendor APIs	License-keyed REST API + webhooks with an audit trail
Import evidence	Vendor logs	Decision log per import + signed receipts a third party can verify offline
Tool or protocol?	A tool: the import runs, the trail stays with the vendor	A protocol: receipt, ambiguity ledger, changeset and a portable import contract

Why teams choose Mildport

• Explainable validation, not a black box. Every header → field decision carries a score you can see, and the normalization pipeline is event-sourced so you can replay exactly what happened to a row. See Capture-first imports.
• Self-hosted by design. Files never leave your VPC; the engine never phones home. This is the path for regulated data and security-reviewed deployments.
• Beyond clean CSVs. Real customer files include messy spreadsheets, PDF tables and scanned documents. Mildport decodes them through dedicated sidecars, not just well-formed CSV.
• Your AI, your call. The deterministic matcher does the predictable work; the optional judge only touches the uncertain tail, with your model and a visible rationale.
• Schema from your API, not from a dashboard. OneSchema’s template editor makes you rebuild your data model by hand. Mildport drafts the import schema from the API spec you already have — review, publish, and every embed updates without a release. The editor itself is embeddable, so your customers can manage their own fields inside your product, versioned with one-click rollback.

When OneSchema is the better fit

If your inputs are reliably clean CSVs, you want a fully managed cloud product, and routing data through a vendor cloud is fine for your compliance posture, a hosted importer is less to operate. Mildport is for when self-hosting and explainability are requirements, not nice-to-haves.

Getting started

npm install @capitality-io/mildport-widget

Define the element, point it at your self-hosted engine, and listen for clean rows:

el.addEventListener('import-applied', e => sync(e.detail));

Full walkthrough in the Quickstart; run the engine yourself with the self-hosting overview.

FAQ

Is Mildport a self-hosted alternative to OneSchema? Yes — an embeddable importer like OneSchema, but proprietary self-hosted software with the engine running in your own infrastructure.

How does Mildport handle validation compared with OneSchema? It validates against a typed contract and maps columns with a deterministic, explainable matcher — visible scores and a replayable pipeline — with an optional AI judge for the uncertain tail only.

Can I run Mildport without sending data to a vendor cloud? Yes. It runs in your environment (Docker Compose or Kubernetes via Helm), licenses verify offline, and files stay in your VPC end to end.

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See it on your own files at mildport.com, or read What is Mildport?