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Databases · head to head

Apache Solr vs RAD Studio

Apache Solr logo

Apache Solr

Databases

Enterprise search platform built on Apache Lucene

From
Free
Free plan
Yes
Visit Apache SolrFull review
RAD Studio logo

RAD Studio

Developer Tools

Cross-platform native app development with Delphi and C++Builder

From
$2000/perpetual
Free plan
No
Visit RAD StudioFull review

The short version

  • RAD Studio is a cross-platform IDE.
  • Apache Solr is free; RAD Studio starts at $2000/mo.
  • Where Apache Solr falls short: XML-heavy configuration and a developer experience that feels dated beside newer engines.
  • Where RAD Studio falls short: professional edition costs $2,000 for the perpetual license plus $599 for year one maintenance, totaling $2,599 before tax.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Apache Solr and RAD Studio actually diverge.

Attributes where Apache Solr and RAD Studio differ
AttributeApache SolrRAD Studio
Starting priceFree$2000/perpetual
Pricing modelOpen source, no licence feeOne-time
Free tierYesNo
PlatformsLinux, Self-hostedWeb
CategoryDatabasesDeveloper Tools

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Apache Solr

  • Lucene-based indexing
  • Faceted search
  • SolrCloud
  • Schema control

Only in RAD Studio

Nothing recorded that Apache Solr does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

Apache Solr

  • Library, archive and catalogue search where faceting is centralnot RAD Studio
  • Long-lived enterprise deployments valuing stability over noveltynot RAD Studio
  • Search requiring precise, explicitly configured relevance tuningnot RAD Studio

RAD Studio

  • Building Windows desktop applications with VCL componentsnot Apache Solr
  • Creating iOS and Android apps from shared Delphi codebasenot Apache Solr
  • Connecting to Oracle databases through FireDAC connectivitynot Apache Solr
  • Building REST web services that run on Linux serversnot Apache Solr

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Apache Solr

  • XML-heavy configuration and a developer experience that feels dated beside newer engines
  • SolrCloud depends on ZooKeeper, adding a component Elasticsearch removed years ago
  • Smaller mindshare now, so newer tutorials, hiring and integrations favour Elasticsearch
  • Considerably heavier than a purpose-built application search engine

RAD Studio

  • Professional edition costs $2,000 for the perpetual license plus $599 for year one maintenance, totaling $2,599 before tax
  • Enterprise edition steps up to $3,400 license plus $1,199 maintenance, and Architect edition to $4,416 license plus $2,183 maintenance
  • The perpetual license only entitles the buyer to updates for one year; continued access to new updates and upgrades requires an annually renewable Update Subscription

Pricing, plan by plan

Apache Solr

Free
  • Apache SolrFree
    • Full functionality
    • No usage limits
    • Community support

RAD Studio

$2000/perpetual
  • Professional Edition$2,000 one-off
    • Perpetual License
    • First year maintenance $599
    • Total $2,599 + Tax
  • Enterprise Edition$3,400 one-off
    • Perpetual License
    • First year maintenance $1,199
    • Total $4,599 + Tax
  • Architect Edition$4,416 one-off
    • Perpetual License
    • First year maintenance $2,183
    • Total $6,599 + Tax

Which should you pick?

Choose Apache Solr if

  • You need lucene-based indexing.
  • You want to start without paying.
  • You work on Linux, Self-hosted.
  • You also want faceted search.
Apache Solr review

Choose RAD Studio if

Nothing in the data separates RAD Studio from Apache Solr on the points above - pick on price and on how each one feels to use.

RAD Studio review

Questions people ask

Is Apache Solr or RAD Studio better?
Neither clearly leads. Apache Solr starts at Free and RAD Studio at $2000/perpetual, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Apache Solr or RAD Studio?
Apache Solr has a free tier; the other does not. Paid plans start at Free for Apache Solr and $2000/perpetual for RAD Studio.
Does Apache Solr or RAD Studio run on more platforms?
Apache Solr runs on Linux, Self-hosted. RAD Studio runs on Web.
Can I use Apache Solr for free?
Yes. Apache Solr has a free tier, so you can try it without paying. RAD Studio starts at $2000/perpetual.
What is Apache Solr best used for?
Apache Solr is most often used for library, archive and catalogue search where faceting is central, long-lived enterprise deployments valuing stability over novelty, search requiring precise, explicitly configured relevance tuning. Of those, library, archive and catalogue search where faceting is central and long-lived enterprise deployments valuing stability over novelty are not what RAD Studio is typically brought in for.
What can Apache Solr do that RAD Studio cannot?
Apache Solr covers Lucene-based indexing, Faceted search, SolrCloud, Schema control.

Answered from the vendors’ own pages

Apache Solr: Is Apache Solr free?

Yes, open source under the Apache Software Foundation.

RAD Studio: How much does RAD Studio cost?

RAD Studio uses perpetual licensing: Professional Edition $2,000 perpetual license + $599 first year maintenance ($2,599 total + tax). Enterprise Edition $3,400 license + $1,199 maintenance ($4,599 total + tax). Architect Edition $4,416 license + $2,183 maintenance ($6,599 total + tax).

Source
Apache Solr: Solr or Elasticsearch?

Both are built on Lucene. Elasticsearch has the larger ecosystem and a friendlier API; Solr is very mature and strong on faceted search, and remains common in library and catalogue systems.

RAD Studio: What is the difference between RAD Studio editions?

Professional Edition ($2,599 total + tax) targets individual developers. Enterprise Edition ($4,599 total + tax) adds multi-tier app capabilities. Architect Edition ($6,599 total + tax) includes advanced database and cloud features. All three include perpetual licenses.

Source
Apache Solr: Is Solr still maintained?

Yes, actively, as a top-level Apache project.

RAD Studio: Does RAD Studio offer Kai AI integration and discounts?

Yes, adding Kai AI to any edition provides discounts: 25% off Professional ($2,136 + tax), 30% off Enterprise ($3,394 + tax), and 40% off Architect ($4,109 + tax). This promotion is active through August 31, 2026.

Source
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