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Sheet Generation

Iteration Layer vs Apache POI

Apache POI is enterprise-grade Java — you get full control, and full responsibility for every cell.

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Why developers switch from Apache POI

Apache POI requires a JVM and verbose Java code — even for a simple spreadsheet.

Any language, not just Java

Apache POI is a Java library. Using it from Python, Go, Node.js, or Ruby means a JVM sidecar, a REST wrapper, or a subprocess call. Our API works from any language with HTTP support.

No JVM infrastructure to manage

Apache POI requires running a JVM — with its memory overhead, startup time, and operational weight. We are a managed API: describe your spreadsheet in JSON, get an XLSX back in one request.

Declarative sheet definition

Apache POI requires writing imperative code — create workbook, create sheet, create row, create cell, set value, set style, repeat for every cell. Our content model describes the entire sheet declaratively in a single JSON payload.

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 Apache POI
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
3 formats

XLSX, XLS, and CSV output supported
Sheet definition style
Declarative JSON

Entire spreadsheet described declaratively in a single JSON payload
Imperative API

Verbose imperative Java code — create workbook, sheet, row, cell, set value, set style, repeat
Open source
Proprietary

Closed-source managed SaaS platform
Apache License

Free and open source under the Apache License
Feature depth
Standard

Standard spreadsheet features including formulas, styling, and multiple sheets
Comprehensive

Full Excel feature set including macros, charts, and pivot tables
Maturity
Growing

Actively growing platform with expanding feature set
20+ years

Over 20 years of development with a large enterprise community
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
Java only

Java library requiring a JVM 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 JVM compute and engineering time
Infrastructure required
None

Fully managed API with no runtime or infrastructure to manage
JVM required

Requires running a JVM with significant memory overhead and startup time
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

$29.99 /per month
  • 1,000 credits / month
    That'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)
  • All APIs included
  • Free trial credits per API
  • Email support
  • Budget caps per key
  • Optional auto top-up
Get Your Free API Key
Most Popular

Startup

Save 40%

For growing teams

$119.99 /per month
  • 5,000 credits / month
    That'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)
  • All APIs included
  • Free trial credits per API
  • Priority support
  • Budget caps per key
  • Optional auto top-up
Get Your Free API Key

Business

Save 47%

For high-volume workloads

$319.99 /per month
  • 15,000 credits / month
    That'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)
  • All APIs included
  • Free trial credits per API
  • Priority support
  • Budget caps per key
  • Optional auto top-up
Get Your Free API Key
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Free trial credits included. No credit card required.

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