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Databases · head to head

Apache Solr vs OutSystems

Apache Solr logo

Apache Solr

Databases

Enterprise search platform built on Apache Lucene

From
Free
Free plan
Yes
Visit Apache SolrFull review
OutSystems logo

OutSystems

No-Code

Enterprise low-code platform priced by application complexity units, not just users

From
On request
Free plan
No
Visit OutSystemsFull review

The short version

  • Apache Solr is free; OutSystems prices on request.
  • Only Apache Solr lists lucene-based indexing; only OutSystems lists visual application modelling.
  • Where Apache Solr falls short: XML-heavy configuration and a developer experience that feels dated beside newer engines.
  • Prices and features on this page were last checked on 1 September 2026.

Where they differ

Only the attributes on which Apache Solr and OutSystems actually diverge.

Attributes where Apache Solr and OutSystems differ
AttributeApache SolrOutSystems
Starting priceFreeOn request
Pricing modelOpen source, no licence feeApplication Object consumption plus internal and external user packs
Free tierYesNo
PlatformsLinux, Self-hostedWeb, iOS, Android
CategoryDatabasesNo-Code

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 OutSystems

  • Visual application modelling
  • Generated deployable code
  • One-click deployment
  • AI-assisted development
  • Application Object governance
  • Prebuilt integrations

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 OutSystems
  • Long-lived enterprise deployments valuing stability over noveltynot OutSystems
  • Search requiring precise, explicitly configured relevance tuningnot OutSystems

OutSystems

  • An enterprise replacing custom .NET or Java application development with a governed low-code platform at scalenot Apache Solr
  • A company building customer-facing portals where the external-user pricing tier (packs of 10,000) is materially cheaper than licensing customers as internal usersnot Apache Solr
  • An IT department that wants generated, inspectable code rather than a proprietary black-box runtimenot Apache Solr
  • An organisation with a large existing application portfolio needing centralised governance across many apps built by different teamsnot 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

OutSystems

  • Application Objects grow with every screen, table and API an app gains, so a successful app that keeps adding features can push the account into AO overage charges that were not modelled at initial budget time
  • Internal users are sold in packs of 100 and external users in packs of 10,000, so a company just over a pack boundary in either category pays for a full additional pack rather than a handful of extra seats
  • Entry-level ODC pricing starts around 36,300 US dollars a year before any AO overage or extra user packs, which puts it out of reach for smaller teams evaluating low-code options
  • Cloud infrastructure and hosting costs are frequently separate from the platform licence, so the all-in bill is higher than the headline subscription figure suggests
  • Migrating a large application portfolio off OutSystems once built is difficult, since the generated code and platform-specific patterns are not designed for a clean export to standard frameworks

Pricing, plan by plan

Apache Solr

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

OutSystems

On request
  • ODC EntryOn request
    • Entry-level Application Object allowance included
    • Internal users sold in packs of 100
    • External users sold in packs of 10,000
  • ODC EnterpriseOn request
    • Custom AO, user pack and environment volumes
    • Negotiated multi-year enterprise agreements
    • Premium support and dedicated infrastructure options

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 OutSystems if

  • You need visual application modelling.
  • You work on Web, iOS, Android.
  • You also want generated deployable code.
OutSystems review

Questions people ask

Is Apache Solr or OutSystems better?
Neither clearly leads. Apache Solr starts at Free and OutSystems at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Apache Solr or OutSystems?
Apache Solr has a free tier; the other does not. Paid plans start at Free for Apache Solr and On request for OutSystems.
Does Apache Solr or OutSystems run on more platforms?
Apache Solr runs on Linux, Self-hosted. OutSystems runs on Web, iOS, Android.
Can I use Apache Solr for free?
Yes. Apache Solr has a free tier, so you can try it without paying. OutSystems starts at On request.
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 OutSystems is typically brought in for.
What can Apache Solr do that OutSystems cannot?
Apache Solr covers Lucene-based indexing, Faceted search, SolrCloud, Schema control. OutSystems covers Visual application modelling, Generated deployable code, One-click deployment, AI-assisted development.

Answered from the vendors’ own pages

Apache Solr: Is Apache Solr free?

Yes, open source under the Apache Software Foundation.

OutSystems: What is an Application Object?

A unit OutSystems uses to measure application complexity, counting elements such as screens, database tables and exposed APIs; more AOs mean a bigger licence requirement.

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.

OutSystems: Is there a free tier?

OutSystems has offered free or trial tiers historically for evaluation, but production use at any scale runs on paid ODC plans.

Apache Solr: Is Solr still maintained?

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

OutSystems: How does external user pricing work?

External users, typically customers or partners, are sold in packs of 10,000 at roughly a hundredth of the per-seat cost of internal (employee) user packs.

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