Data pipelines & ETL
ChemDataDoctor
CAS number validator and spreadsheet cleaner for chemical data
- 0community votes
- 18DR by Ahrefs −1 (down) since last check
Ahrefs Domain Rating listed 6 Nov 2026, relisted 1 Nov 2026.
Free tool to validate CAS numbers, check formatting, tidy spacing, and flag duplicates in chemical spreadsheets from Excel, CSV or pasted lists without signup
What it is
ChemDataDoctor: the homepage
ChemDataDoctor helps people working with chemical lists catch everyday data problems. The tool checks CAS number format and check digits, tidies spacing issues, flags duplicates, and highlights formatting problems like date conversions. It processes files directly in your browser without uploading data, requires no account, and keeps original values intact while providing cleaned results. The tool does not verify substance identity, CAS registration, or provide chemical identity verification—results require review against trusted sources.
Listed capabilities
- CAS number format and check digit validation
- Normalize spacing and formatting
- Flag duplicate entries
- Detect date conversion errors
- Support Excel and CSV files
- Preserve original data in exports
- Process files in browser without uploading
- Offline mode support
- Handle large files up to 50,000 rows
- Support multiple text encodings
Pricing
Pricing model: Free
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ChemDataDoctor metrics
| Metric | Value |
|---|---|
| Domain Rating | 18 −1 (down) since last check |
| Trust Flow | 6 no change since last check |
| Citation Flow | 24 no change since last check |
| Referring domains | 14 no change since last check |
| External backlinks | 119,886 no change since last check |
Ahrefs Domain Rating listed 6 Nov 2026, relisted 1 Nov 2026. Listed under topic: Science/Biology (6). Majestic listed 25 Oct 2026, relisted 25 Oct 2026. Link data listed by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
ChemDataDoctor domain listing data
Show the listing data
| Domain age | 2 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | Spaceship, Inc. |
| DNSSEC | Not signed |
ChemDataDoctor launch receipt entry
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 19 to 18 −1 (down) since launch 25 Oct 2026, then 6 Nov 2026 |
| Trust Flow (Majestic) | 6 first measured 25 Oct 2026 |
| Referring domains (Majestic) | 14 first measured 25 Oct 2026 |
Day 11 since launch. Next receipt: day 30, 24 Nov 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Before you launch
The playbook on SaaS Directory List lists what to prepare, what to post on launch day and where else to list your product.
Compare and explore
Quick answers
Does a passing result mean the chemical is correct?
No. The tool checks the number's format and check digit, but not whether it exists in CAS REGISTRY® or belongs to the substance in your list. Uncertain entries should be checked against a trusted source.
Will you change or delete my original data?
Your source file is never changed. By default, downloads keep every original column and add cleaned values and notes. Duplicates are marked, never deleted automatically.
Can I use it without an internet connection?
After the site finishes preparing offline use, you can open files, check, and export without an internet connection in the same browser. Clearing browser site data removes the offline copy.
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ChemDataDoctor has a free listing. The owner can unlock the full profile with a paid launch for $5:
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