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Databases · head to head

Knack vs Weka

Knack logo

Knack

Databases

Hosted no-code database and web app builder priced by stored records and storage, with unlimited user accounts on every plan.

From
$59/month
Free plan
No
Visit KnackFull review
Weka logo

Weka

Machine Learning

Collection of machine learning algorithms

From
Free
Free plan
Yes
Visit WekaFull review

The short version

  • Weka is free; Knack starts at $59/mo.
  • Only Knack lists visual database builder; only Weka lists association rules.
  • Where Weka falls short: Weka requires a 64-bit Java VM; the bundled installers ship Bellsoft OpenJDK 25 per platform and architecture.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Knack and Weka actually diverge.

Attributes where Knack and Weka differ
AttributeKnackWeka
Starting price$59/monthFree
Pricing modelSubscriptionOpen-source
Free tierNoYes
PlatformsWebLinux, macOS, Windows
CategoryDatabasesMachine Learning

Not yet recorded: founded for Knack.

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 Knack

  • Visual database builder
  • User logins and roles
  • Page builder
  • Unlimited users
  • E-commerce
  • Automation flows
  • Scheduled tasks
  • REST API and webhooks

Only in Weka

  • Classification
  • Regression
  • Clustering
  • Association rules
  • Feature selection
  • Java
  • R
  • Python

What people use each for

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

Knack

  • A member or client portal where thousands of external people need their own login and see only their own recordsnot Weka
  • Replacing a shared spreadsheet used by a team that has outgrown it but cannot justify a developer to build a bespoke internal toolnot Weka
  • Inventory, asset or case tracking for a small operations team that needs roles, forms and a record of who changed whatnot Weka
  • A registration or booking application for an association, school or non-profit where the user count is large and the record count stays modestnot Weka

Weka

  • Teaching and exploring classic machine learning algorithms through a GUInot Knack
  • Running data mining experiments and preprocessing without writing codenot Knack

Where each one falls short

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

Knack

  • Plans are capped by stored records, so an application that logs events or keeps history rather than current state climbs tiers on data volume alone, and archiving old records becomes a permanent maintenance chore rather than a one-off
  • API access is capped per day, at 1,000 calls on the entry plan and 10,000 at the Corporate tier, so a scheduled sync or a busy automation can exhaust the day's quota before the working day ends and integrations then fail silently
  • The application itself cannot be exported or self-hosted; records can be downloaded but the pages, roles, flows and business logic exist only inside Knack, so outgrowing the platform means rebuilding the app rather than moving it
  • Customisation beyond the builder is limited to injected CSS and JavaScript that Knack's support does not cover, so any non-standard interface behaviour becomes yours to maintain against a DOM the vendor can change without warning
  • Compliance capabilities that regulated buyers assume are baseline, HIPAA and GovCloud options, advanced SSO, IP restrictions and private environments, are gated to the Corporate and Enterprise tiers, so a small regulated pilot cannot legitimately start on an entry plan

Weka

  • The package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
  • Weka is split into a stable 3.8 branch that receives only bug fixes and compatibility-safe upgrades and a 3.9 development branch that may receive features that break compatibility
  • Weka requires a 64-bit Java VM; the bundled installers ship Bellsoft OpenJDK 25 per platform and architecture

Pricing, plan by plan

Knack

$59/month
  • Starter$59/mo
    • 20,000 database records
    • Unlimited users, tables, fields
    • 25 AI credits
  • Pro$130/mo
    • 50,000 database records
    • Remove Knack branding
    • E-commerce payments
  • Corporate$300/mo
    • 125,000-2.5M database records
    • App restore functionality
    • Advanced SSO
  • EnterpriseOn request
    • Dedicated account manager
    • HIPAA/GovCloud-based options
    • Custom pricing

Weka

Free
  • Open SourceFree
    • All ML algorithms
    • GUI and CLI
    • Java API

Which should you pick?

Choose Knack if

  • You need visual database builder.
  • You also want user logins and roles.
Knack review

Choose Weka if

  • You need classification.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want regression.
Weka review

Questions people ask

Is Knack or Weka better?
Neither clearly leads. Knack starts at $59/month and Weka at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Knack or Weka?
Weka has a free tier; the other does not. Paid plans start at $59/month for Knack and Free for Weka.
Does Knack or Weka run on more platforms?
Knack runs on Web. Weka runs on Linux, macOS, Windows.
Can I use Weka for free?
Yes. Weka has a free tier, so you can try it without paying. Knack starts at $59/month.
What is Knack best used for?
Knack is most often used for a member or client portal where thousands of external people need their own login and see only their own records, replacing a shared spreadsheet used by a team that has outgrown it but cannot justify a developer to build a bespoke internal tool, inventory, asset or case tracking for a small operations team that needs roles, forms and a record of who changed what, a registration or booking application for an association, school or non-profit where the user count is large and the record count stays modest. Of those, a member or client portal where thousands of external people need their own login and see only their own records and replacing a shared spreadsheet used by a team that has outgrown it but cannot justify a developer to build a bespoke internal tool are not what Weka is typically brought in for.
What can Knack do that Weka cannot?
Knack covers Visual database builder, User logins and roles, Page builder, Unlimited users. Weka covers Classification, Regression, Clustering, Association rules.

Answered from the vendors’ own pages

Knack: Is Knack charged per user?

No. User accounts are unlimited on all plans. Plans are bounded by stored record count, file storage, API calls per day and automation transactions.

Weka: What is the cost of Weka software?

Weka is provided at no cost as open-source software released under the GNU General Public License, making it freely available for download and use.

Source
Knack: What happens when I exceed the record limit?

You move to a higher tier or reduce stored records. Because the limit is on data rather than people, apps that accumulate history hit it while apps that track a fixed set of entities generally do not.

Weka: Are there commercial licensing options available?

Yes, the project offers information about commercial licenses for organizations requiring non-GPL terms, which can be found in their commercial applications documentation.

Source
Knack: Can I export my application or self-host it?

You can export record data. The application itself, its pages, roles, permissions and flows, is not exportable and cannot be self-hosted, so leaving means rebuilding elsewhere.

Weka: What support resources are available to users?

Multiple support avenues exist including comprehensive documentation, frequently asked questions, dedicated help resources, and access to courses for learning the platform.

Source
Knack: Is it suitable for public-facing portals?

That is its strongest case, because logins are unlimited and role-based permissions are built in. The constraint is record volume and API throughput, not audience size.

Weka: Is source code access provided?

Yes, developers have full access to source code through the Git repository, along with development documentation and code credits for contributors.

Source
Knack: Can I use it for regulated data?

HIPAA-aligned and government cloud options exist but only on the Enterprise tier, along with private server environments. Lower tiers should not be used for regulated workloads.

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