5 Best Internal Tools Builders for Custom Apps in 2026

Internal tools don't need to be built from scratch. Modern platforms let you build admin panels, dashboards, and business apps in hours. Connect to your database, drag in components, add custom logic, and deploy. We tested the leading platforms.

Last updated: February 3, 2026Reviewed 10+ tools

5 Best Internal Tools Builders comparison

Feature Comparison

ToolStarting PriceOpen SourceSelf-HostComponentsOur Rating
RetoolFree/$10NoYes90+9.5/10
AppsmithFree/$40YesYes45+9.1/10
AirplaneFree/$10NoNo30+9.0/10
SuperblocksCustomNoYes50+8.8/10
TooljetFree/$20YesYes40+8.5/10

Deep Dives

1

Retool

Best Overall
Retool

Retool is the clear leader in internal tools. The component library is the richest, the integrations are the deepest, and you can write custom JavaScript anywhere. Build admin panels in hours that would take weeks.

Starting priceFree/$10

Strengths

  • 90+ components
  • Any database/API
  • Custom JS
  • Workflows
  • Mobile apps
  • Self-hostable

Limitations

  • Expensive at scale
  • Learning curve
  • Vendor lock-in
Who it's for: Best choice for most internal tool projects.
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2

Appsmith

Best for Budget
Appsmith

Appsmith is the leading open source alternative to Retool. Self-host for free, build similar apps, and avoid vendor lock-in. The community is active and the product is improving rapidly.

Starting priceFree/$40

Strengths

  • Open source
  • Free self-hosted
  • Similar to Retool
  • No vendor lock-in
  • Active development
  • Good docs

Limitations

  • Less polished
  • Fewer components
  • Smaller ecosystem
Who it's for: Best open source option for internal tools.
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3

Airplane

Best for Enterprise
Airplane

Airplane takes a code-first approach. Write Python or TypeScript functions, then build UIs around them. Better for developer-heavy teams who want more control. Great for operational tools and runbooks.

Starting priceFree/$10

Strengths

  • Code-first
  • Developer-friendly
  • Tasks & runbooks
  • Good for ops
  • Approval flows
  • Audit logs

Limitations

  • Less visual
  • Smaller component library
  • Newer
Who it's for: Best for developer-heavy teams preferring code.
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4

Superblocks

Best for Beginners
Superblocks

Superblocks focuses on enterprise needs. AI-powered components, strong security features, and SOC 2 compliance. Good for organizations with strict requirements.

Starting priceCustom

Strengths

  • Enterprise security
  • AI components
  • SOC 2
  • On-prem option
  • Good performance
  • Strong support

Limitations

  • Custom pricing
  • Less known
  • Overkill for startups
Who it's for: Best for enterprise with security requirements.
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5

Tooljet

Tooljet

Tooljet is a simpler open source alternative. Easier to get started than Appsmith, though less powerful. Good for straightforward internal tools that don't need complex logic.

Starting priceFree/$20

Strengths

  • Open source
  • Simple to start
  • Self-hostable
  • Free tier
  • Good for basics
  • Active development

Limitations

  • Less powerful
  • Fewer integrations
  • Simpler apps only
Who it's for: Good for simpler internal tool needs.
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How We Evaluated

We built real internal tools on each platform to evaluate properly.

  • Development Speed (30%)How fast to build apps?
  • Flexibility (25%)Handles complex requirements.
  • Components (20%)Rich component library.
  • Deployment (15%)Easy to deploy and maintain.
  • Value (10%)Pricing for teams.

How to Choose

  • Choose Retool if you need Most capable.
  • Choose Appsmith if you need Open source.
  • Choose Airplane if you need Code-first.
  • Choose Superblocks if you need Enterprise.
  • Choose Tooljet if you need Simple needs.

Common Questions

Retool is more polished and powerful. Appsmith is open source and free to self-host. Choose Retool for speed and features, Appsmith for cost and control.

For admin panels and CRUD apps, these platforms are 10x faster. For highly custom UIs, custom development may be better.

Self-hosted gives you data control and avoids per-user costs. Cloud is easier to manage and update. Many choose cloud initially, then self-host at scale.