invcheck
Deterministic Arithmetic, Tax & E-Invoice JSON Verifier & Auto-Repair Engine
The missing 0-dependency MIT verification primitive for Docling, MarkItDown, Textract, and VLM Extractors
Why invcheck?
Every modern document extraction pipeline (using IBM Docling, Microsoft MarkItDown, LiteParse, or GPT-4o / Claude Sonnet vision prompts) suffers from a critical flaw: models cannot guarantee exact arithmetic.
- Line items drift by off-by-one cent rounding errors ($0.01).
- Subtotals and tax rates hallucinate mismatches.
- Extracted IBANs, VAT numbers, and EINs contain dropped or transposed characters.
invcheck provides a sub-millisecond, zero-dependency, deterministic financial boundary for your extraction pipeline. Available synchronously in both TypeScript and Python.
| Feature | invcheck |
Reducto | strutex | Manual Regex / Scripts |
|---|---|---|---|---|
| License | MIT (Free forever) | Proprietary SaaS ($$$) | GPL-3.0 (Viral) | Custom |
| Dependencies | 0 (Zero) | Heavy API SDK | Python dependencies | None |
| Runtime | Sub-millisecond Local | Cloud API (100-500ms) | Local (Python only) | Fast |
| TypeScript + Python | Yes (Full parity) | Python/REST only | Python only | Fragmented |
| EN 16931 Banker's Rounding | Yes | Cloud blackbox | Partial | Rarely |
| Auto-Repair / Healing Mode | Yes (Diff + Confidence) | Cloud blackbox | No | No |
| IBAN / VAT / EIN Checksums | Yes (ISO 7064, Mod 89/97) | Partial | No | Fragile |
Quickstart
Node.js / TypeScript
1 maintainer
Metadata
1 maintainer
Release files for invcheck 1.0.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
|---|---|---|---|---|
| invcheck-1.0.0.tar.gz | 9.9 kB | Without provenance | Details for invcheck-1.0.0.tar.gz |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Actions Reset |
|---|---|---|---|---|
| invcheck-1.0.0-py3-none-any.whl | Python 3 | none | any | Details for invcheck-1.0.0-py3-none-any.whl |
Total release size: 22.8 kB
Release files / invcheck-1.0.0.tar.gz
| Download URL | invcheck-1.0.0.tar.gz |
|---|---|
| Size | 9.9 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
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BLAKE2b-256 checksum How to use checksums |
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| Upload date | |
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Uploaded using Trusted Publishing? What is trusted publishing? |
No |
| Uploaded via |
twine/7.0.0 CPython/3.13.5
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Release files / invcheck-1.0.0-py3-none-any.whl
| Download URL | invcheck-1.0.0-py3-none-any.whl |
|---|---|
| Size | 12.8 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
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BLAKE2b-256 checksum How to use checksums |
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| Upload date | |
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Uploaded using Trusted Publishing? What is trusted publishing? |
No |
| Uploaded via |
twine/7.0.0 CPython/3.13.5
|
Security for invcheck 1.0.0
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