When this comparison was first written in February 2026, the honest answer was that Bolt.new and Lovable had near-identical security defaults and both left Row Level Security off. That is no longer true, and the difference now sits in writing on each vendor's own site. Lovable's founder security guide, published 24 March 2026, states plainly that "Lovable enables RLS by default and includes a linter that catches missing RLS enablement after database migrations." Bolt's security page makes a narrower promise about generated code: "When Bolt generates code that touches a database, it follows Row Level Security best practices as far as the application allows." Bolt's database documentation does not mention RLS defaults at all.
That gap between a database-level default and a best-effort generation-layer habit is the whole comparison now.
TL;DR
The two platforms have diverged. Lovable states RLS is on by default, runs a migration linter, and gates publishing behind automated scans. Bolt promises secure generation patterns but documents no RLS default, so tables can ship readable. Both are vendor claims, not audits, so verify your own database either way with the query below.
What Changed Since Early 2026
Two platform shifts moved this comparison, and both are worth knowing before you pick.
Bolt launched Bolt Cloud on 14 August 2025, which changed what a "new Bolt project" even means. Every project now ships with a managed database from creation: "Every project includes a fully managed, high-performance database from the moment you create it. No provisioning, no config files, no separate accounts." Bolt Cloud also handles auth in-house, covering "signups, logins, password resets, and role based access." Connecting your own Supabase project is still supported, but it is now an integration for Pro and Teams plans rather than the default path.
Lovable went the other direction and invested in checks rather than just defaults. Its documentation describes a Quick Scan that "runs automatically at publish" covering database review, dependency audit and an MCP server check, plus a Deep Scan that reviews "all your application code for issues specific to your app's logic, permissions, and data."
Platform Comparison
| Feature | Bolt.new | Lovable |
|---|---|---|
| Built by | StackBlitz | Lovable (formerly GPT Engineer) |
| Default backend | Bolt Cloud database, included in every project | Lovable Cloud, Supabase-backed |
| Bring your own Supabase | Integration on Pro and Teams plans | Native |
| Code access | Full source in browser | GitHub sync |
| Deployment | Netlify, Bolt hosting | Built-in |
| Framework | React, Next.js | React, Next.js |
Security Defaults
This is where the two now genuinely differ. Every cell below reflects what the vendor documents today, not what we measured.
| Security feature | Bolt.new | Lovable |
|---|---|---|
| Row Level Security | No documented default. Security page claims generation follows RLS best practices "as far as the application allows" | Stated as enabled by default, with a linter for missing RLS after migrations |
| Automated security scan | Not documented | Quick Scan at publish, plus on-demand Deep Scan |
| Authentication | Built into Bolt Cloud (signups, logins, resets, role-based access) | Built into Lovable Cloud |
| Secrets handling | Secrets tab; server functions read them at runtime | Detects API keys pasted into chat and redirects them to Secrets |
| Server-side calls | Server functions | Edge Functions generated for integrations |
| Security headers | Not configured | Not configured |
Read the Bolt wording carefully. "As far as the application allows" is a hedge about the generation layer, not a guarantee about your database. A model that writes CREATE TABLE without ENABLE ROW LEVEL SECURITY leaves that table readable by anyone holding the anon key, and the anon key ships to the browser by design. Bolt's own database docs never claim RLS is on.
The layer asymmetry worth understanding
Bolt's claim and Lovable's claim are about different layers, which is why they are easy to misread as equivalent.
Bolt is describing code generation: when the model writes a query, it aims for parameterised queries and sensible patterns. Lovable is describing database state: the table has RLS turned on whether or not the model remembered to ask for it. A generation-layer habit fails silently the moment the model takes a shortcut. A database-level default does not depend on the model's attention at all.
That makes Lovable's posture structurally stronger on this specific risk. It does not make Lovable's apps secure, and Lovable says so itself: its documentation warns these tools "cannot guarantee complete security" and "do not replace a thorough security review."
Verify It Yourself Instead of Trusting Either Claim
Both statements above are vendor marketing and documentation, not independent audits. The useful move is to check your own project. Both platforms run Postgres, so the same query works on either.
select schemaname, tablename, rowsecurity
from pg_tables
where schemaname = 'public'
order by rowsecurity, tablename;
Any row where rowsecurity is false is readable and writable by anyone with your anon key. On a public app, that is everyone.
RLS being enabled is necessary but not sufficient. A table with RLS on and no policies denies everything, which looks secure and breaks your app. A table with RLS on and a permissive using (true) policy is exactly as exposed as having RLS off, while reporting true in the query above.
select tablename, policyname, cmd, qual
from pg_policies
where schemaname = 'public'
order by tablename;
If qual reads true on a table holding user data, that policy is decoration. You want something closer to (select auth.uid()) = user_id.
Steps to Secure Generated Apps
Run both queries above against your project's database and write down every table where rowsecurity is false.
Enable RLS on those tables, then write a policy per table scoped to the owning user rather than a blanket true.
Grep your client bundle for anything that looks like a service role key or a third-party API secret. Anon keys belong in the browser; service role keys never do.
Move any integration that needs a secret into a server function or Edge Function so the credential stays server-side.
On Lovable, run the Deep Scan and read the findings rather than only the Quick Scan that fires at publish. On Bolt, there is no equivalent built-in scan, so this step is yours to own.
Test access control by signing in as a second user and attempting to read the first user's rows. A passing RLS config makes this return nothing.
Which Should You Choose?
Choose Bolt.new if: you want the fullest code access in the browser, prefer flexibility across backends and frameworks, or are already on Netlify. The trade-off is that database hardening is entirely your job.
Choose Lovable if: the database default matters more to you than backend flexibility. RLS on by default plus a migration linter removes the single most common way these apps leak data, and the publish-time scan gives you a second look you would otherwise have to remember to perform.
Neither ships production-ready. Security headers are unconfigured on both. Neither platform knows which of your tables hold sensitive data, which policies match your business rules, or whether your auth flow has holes. Both are good at getting an app working and neither is a substitute for reviewing what shipped.
Sources
| Claim | Source | Date |
|---|---|---|
| Lovable enables RLS by default, plus migration linter | A founder's guide to Lovable security | 24 Mar 2026 |
| Quick Scan at publish, Deep Scan on demand, "cannot guarantee complete security" | Lovable security docs | Accessed 1 Oct 2026 |
| Bolt follows RLS best practices "as far as the application allows" | Bolt platform security | Accessed 1 Oct 2026 |
| Every Bolt project includes a managed database; built-in auth | Introducing Bolt Cloud | 14 Aug 2025 |
| Bolt secrets read by server functions | Bolt secrets docs | Accessed 1 Oct 2026 |
| Supabase as a Pro/Teams integration | Bolt Supabase integration | Accessed 1 Oct 2026 |
Which generates more secure code?
On the single risk that causes most data leaks in these apps, Lovable has the stronger default: it states RLS is enabled by default and runs a linter for missing RLS after migrations. Bolt documents no RLS default and promises only that generation follows RLS best practices "as far as the application allows." Beyond that one difference, both still require you to review auth, policies and secrets yourself.
Does Lovable enabling RLS by default mean my Lovable app is safe?
No. RLS on with a using (true) policy is exactly as exposed as RLS off, and it reports as enabled. Lovable's own documentation says its scans "cannot guarantee complete security" and "do not replace a thorough security review." Run the pg_policies query above and check what the policies actually say.
Do I still need Supabase with either platform?
Not for a default project. Bolt Cloud ships a managed database with every project as of August 2025, and Lovable Cloud is Supabase-backed without you creating an account. Connecting your own Supabase project is a Pro or Teams integration on Bolt and native on Lovable.
Can I prompt for security features?
Both respond to prompts like "enable Row Level Security on every table" or "move this API call server-side." Treat the output as a draft: verify the generated policies with the queries above rather than trusting that the prompt landed.
Which is better for learning security?
Neither, because both hide the implementation. If the goal is understanding rather than shipping, use an IDE-based assistant where you write the policy yourself and can see what each line does.
Further Reading
Made your choice? Here's how to secure your selected stack.
Scan Your Generated App
Check for security issues in Bolt.new or Lovable projects.