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.
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.
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.
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.
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.
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.
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.