I compared 7 Panchang APIs from their documentation to map real feature coverage differences

While building a Hindu calendar / muhurat feature, I ran into a recurring issue: most Panchang APIs describe themselves as “complete,” but the actual feature coverage varies significantly depending on what you need.

To understand this better, I reviewed the public documentation of 7 Panchang/astrology API providers and created a feature comparison matrix.

This is strictly a documentation-based comparison - no runtime testing was performed. The goal is to map feature availability, not correctness or astronomical accuracy.

FEATURES EVALUATED

Core Panchang elements:

- Tithi

- Nakshatra

- Yoga

- Karana

- Sunrise / sunset / moonrise / moonset

Extended astrology calculations:

- Choghadiya

- Hora

- Chandra Bala / Tara Bala

- Disha Shool

- Panchak

- auspicious / inauspicious time windows

Electional / muhurat systems:

- dedicated muhurat finder (not just yoga listing)

Calendar systems:

- Amanta / Purnimanta systems

- Vikram / Shaka calendars

- regional calendars (Tamil, Telugu, Malayalam, Bengali, Gujarati)

Additional coverage:

- festival endpoints

- support for non-Hindu calendars (where available)

KEY FINDINGS

- Core Panchang calculations are widely supported across providers.

- Major differences appear in applied astrology features (Hora, Choghadiya, muhurat systems).

- Dedicated electional muhurat APIs are relatively rare.

- Regional calendar support is inconsistent, especially for South Indian formats.

IMPORTANT LIMITATION

This does not evaluate accuracy or real-world correctness.

It only reflects what is exposed in public API documentation.

COMPARISON SHEET (READ-ONLY)

https://docs.google.com/spreadsheets/d/16O3QuiHlKTdCn0SZSU-_gGuTDjLBr_M0Vorbb4j8i4c

If others have done similar comparisons or used multiple APIs together in production, I’d be curious how they handled gaps in regional calendars or muhurat calculations.