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Geocoding Service Comparison

🔍 Nominatim (OpenStreetMap)

✅ Usage (Public instance)

  • Rate limit:
    • 1 request per second per IP (strictly enforced)
    • No batch or bulk geocoding allowed
  • User-Agent required: Must include a valid User-Agent and ideally contact info (email)
  • Caching: Required if you intend to repeatedly geocode the same queries

❌ Restrictions

  • No heavy use: Not for production/commercial use without hosting your own instance
  • No high-volume automated use (e.g., large datasets)

✅ Hosting Your Own Instance

  • No usage limits (other than what your hardware/network can support)
  • Requires ~40–60 GB for the planet data + RAM/CPU depending on region

🌍 Alternatives

✅ Google Maps Geocoding API

  • Free: 100 requests/day (after enabling billing)
  • Paid: $5 per 1000 requests (first $200/month free = 40,000 requests/month)
  • Advantages:
    • Highly accurate, global coverage
    • Reverse geocoding, autocomplete, place details
  • Limits: 50 QPS by default (can request higher)

✅ Mapbox Geocoding API

  • Free: 100,000 requests/month
  • Paid: Starts at $0.75 per 1000 requests
  • Great for: Visual map integration, flexible plans

✅ HERE Geocoding & Search API

  • Free: 250,000 transactions/month with Freemium plan
  • Commercial: Volume pricing available
  • Good for: Batch geocoding, enterprise-grade use

✅ Esri (ArcGIS) Geocoding

  • Free limited use via developer accounts
  • Commercial plans for enterprise
  • Strong on address precision and parcel-level data (especially in US)

✅ Positionstack

  • Free tier: 25,000 requests/month
  • Paid plans: Start at $9/month
  • Offers both forward and reverse geocoding using OpenStreetMap and other sources

✅ OpenCage

  • Free: 2,500 requests/day
  • Paid: From $50/month for 100,000 requests
  • Built on OSM and other open data, includes confidence scores

🧭 Summary Comparison Table

Provider Free Tier Rate Limits Batch Support Notes
Nominatim Yes (1 rps, public instance) 1 rps/IP ❌ Must self-host for heavy use
Google Maps $200/month free (≈40,000 reqs) 50 QPS ✅ Very accurate, costly beyond free
Mapbox 100,000 reqs/month Usage-based ✅ Stylish maps, developer-friendly
HERE 250,000/month (Freemium) Usage-based ✅ Commercial-grade
Esri Limited via dev account Enterprise-focused ✅ Excellent for US data
OpenCage 2,500/day Tier-based ✅ Clean OSM-based API
Positionstack 25,000/month Tier-based ✅ Lightweight, simple