Iteration Layer vs OpenPyXL
OpenPyXL is the standard Python spreadsheet library — essential if your stack is Python, a dependency if it isn't.
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Why developers switch from OpenPyXL
openpyxl means writing cell-by-cell Python code and hosting the service yourself.
Any language, not just Python
OpenPyXL is Python-only. If your backend is Go, Node.js, Elixir, or Java, generating Excel files requires a Python subprocess or sidecar. Our API accepts JSON from any language with HTTP support.
No Python environment to manage
OpenPyXL requires a Python environment with the correct package versions. In production, that means managing a virtualenv or Docker image for spreadsheet generation. We are a managed API: one endpoint, one request.
Declarative JSON, not cell-by-cell iteration
OpenPyXL requires building workbooks row by row: create workbook, create worksheet, iterate rows, set cell values, apply styles. Our JSON payload describes the entire sheet structure declaratively.
Feature-by-feature comparison
We went through the docs so you don't have to. Here's how every feature compares — including the ones where we're not the better choice.
| Feature | Iteration Layer | OpenPyXL |
|---|---|---|
| Formula support |
Yes
Generate spreadsheets with Excel-compatible formulas |
Yes
Full formula support through programmatic API calls |
| Multi-sheet support |
Yes
Generate workbooks with multiple named sheets |
Yes
Full multi-sheet workbook support with programmatic API |
| Output formats |
3 formats
XLSX, CSV, and Markdown output |
1 format
XLSX output only |
| Sheet definition style |
Declarative JSON
Entire spreadsheet described declaratively in a single JSON payload |
Imperative API
Spreadsheets built row by row with imperative cell-by-cell iteration |
| Open source |
Proprietary
Closed-source managed SaaS platform |
MIT license
Free and open source under the MIT license |
| Data science ecosystem |
HTTP API
Standard HTTP API without native data science library integration |
Native
Native integration with pandas and NumPy for data science workflows |
| Read & modify Excel |
Generation only
Generates new spreadsheets from JSON — does not read or modify existing files |
Read + write
Can read, modify, and write back existing Excel files |
| EU hosting |
EU only
All processing happens exclusively on EU-hosted servers |
Your choice
Runs on your infrastructure, so data residency depends on where you deploy |
| Language support |
Any language
REST API callable from any programming language with HTTP support |
Python only
Python library requiring a Python runtime environment |
| Pricing model |
Per sheet
Pay-per-use pricing based on the number of sheet generation requests |
Free
Open source and free to use — costs are limited to your own compute infrastructure |
| Infrastructure required |
None
Fully managed API with no Python environment, virtualenvs, or Docker images to manage |
Self-hosted
Requires managing a Python environment with the correct package versions in production |
| GDPR / Data privacy |
Zero retention
No files or results stored beyond temporary 90-day logs |
Your responsibility
Data privacy depends entirely on your deployment and infrastructure choices |
Pricing
Start with free trial credits. No credit card required.
Developer
For individuals & small projects
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1,000 credits / monthThat's either: 1,000 image transformations 500 document generations 500 image generations 500 sheet generations 200 document extractions (5-page docs) 200 markdown conversions (5-page docs)
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All APIs included
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Free trial credits per API
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Email support
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Budget caps per key
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Optional auto top-up
Startup
Save 40%For growing teams
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5,000 credits / monthThat's either: 5,000 image transformations 2,500 document generations 2,500 image generations 2,500 sheet generations 1,000 document extractions (5-page docs) 1,000 markdown conversions (5-page docs)
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All APIs included
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Free trial credits per API
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Priority support
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Budget caps per key
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Optional auto top-up
Business
Save 47%For high-volume workloads
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15,000 credits / monthThat's either: 15,000 image transformations 7,500 document generations 7,500 image generations 7,500 sheet generations 3,000 document extractions (5-page docs) 3,000 markdown conversions (5-page docs)
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All APIs included
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Free trial credits per API
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Priority support
-
Budget caps per key
-
Optional auto top-up
Start building in minutes
Free trial credits included. No credit card required.