Free App Development Tools
Interactive calculators and recommenders to help you plan your app project. Get instant estimates for timeline, cost, and technology stack.
Firebase Security Rules Checker
Paste firestore.rules or storage.rules to find public paths, test-mode rules, sign-in-only checks and ownership takeovers. Runs in your browser.
Try it free →Supabase Oct 30 Grants Checker
Paste a Supabase migration to find tables that need a GRANT after October 30, RLS that is off, policies of true and views that skip RLS. Runs in your browser.
Try it free →Supabase RLS Policy Checker
Paste Supabase policy SQL to find policies of true, sign-in-only checks, user_metadata roles, storage buckets anyone can list or write to, and exposed security definer functions. Runs in your browser.
Try it free →Min Instances Cost Calculator
See what minimum instances on Cloud Functions (2nd gen) and Cloud Run cost per month while idle, from Google’s published list prices.
Try it free →Shopify App Script Checker
Paste your store’s page source to see every third-party script, which ones block rendering, ScriptTag apps and app embeds. Runs in your browser.
Try it free →App Development Timeline Calculator
Estimate how long your app project will take based on type, complexity, features, and team size. Get a phase-by-phase breakdown.
Try it free →App Development Cost Calculator
Get a low-to-high cost range, per-feature breakdown, timeline and yearly maintenance, with every assumption and source listed.
Try it free →Technology Stack Recommender
Answer questions about your goals, platforms, and requirements to get a personalized technology stack recommendation.
Try it free →App Cost Estimate Creator
Get an instant custom estimate for your app development project based on platform, features, timeline, and budget.
Try it free →Want a Personalized Estimate?
Our interactive tools provide a starting point. For a detailed, accurate estimate tailored to your specific project, talk to Simon directly.