Clerk vs Supabase Auth vs Firebase Auth
Each person using your Lovable, bolt.new or Cursor app should see only their own data. That means real accounts.
- Pick
- Clerk98/100
- Runner-up
- Firebase Auth94/100
Which AI tool should I use? One tested pick for each job.
Pick a job, like adding login to your app. We try each tool on the same app and tell you which one to use, plus a runner-up. Every pick links to its dated test log.
See the tested picks Free security checklist
- 13 verdicts and 32 tools tested.
- Last tested Oct 16, 2026.
- Every test log is public.
- Nobody pays for a spot.
Tested picks, by job
Each page answers one job with a winner and a runner-up. If we haven't finished testing a job, we don't name a tool yet.
Make a voiceover from a script
You need a clear voiceover for a demo, tutorial or short video. You don't want to record yourself, pay per character, or get a licence that blocks commercial use.
- Pick
- Kokorowon on tie-breaker91/100
- Runner-up
- Piper91/100
Automate a workflow on your own server
When someone signs up, you want the follow-up done for you: add them to your customer list, ping your team for paying plans, retry when a service hiccups. You don't want to write an app or pay per task.
- Pick
- Node-RED96/100
- Runner-up
- n8n94/100
Check grammar and spelling
Catch typos and grammar mistakes before you publish, with no subscription and without sending your drafts to someone else's server.
- Pick
- LanguageToolwon on tie-breaker100/100
- Runner-up
- Harper100/100
Database for your vibe-coded app
Right now your Lovable, bolt.new or Cursor app keeps its data in a file or in memory. You want a real database that's free, safe from strangers and easy to leave later.
- Pick
- Neon100/100
- Runner-up
- Cloudflare D198/100
Extract tables from PDFs
Your invoices, reports, price lists or statements are PDFs, and you need the tables inside them as rows and columns for a spreadsheet, your app or an AI.
- Pick
- Docling100/100
File uploads for your app
People need to upload photos or files to your Lovable, bolt.new or Cursor app. You want the files stored privately, not on your server's disk, and big files sent straight to storage.
- Pick
- Supabase Storagewon on tie-breaker96/100
- Runner-up
- Vercel Blob96/100
Custom Domain: Cloudflare Pages vs Vercel
You bought a domain for your Lovable, bolt.new or Cursor app. Now you want to put the app online there, with HTTPS, without breaking your email.
- Pick
- Cloudflare Pageswon on tie-breaker85/100
- Runner-up
- Vercel86/100
Vibe coding security check
Is my vibe-coded app safe? Before you launch your Lovable, bolt.new or Cursor app, you want one tool to tell you. It should say whether your app leaks data or secrets, and what to fix. Most of these apps keep their data in Supabase.
- Pick
- Supabase Security Advisor76/100
- Runner-up
- Aikido Security (free Developer plan)66/100
Send emails from your app
Sign-up confirmations, password resets and receipts from your Lovable, bolt.new or Cursor app should come from your own domain and land in the inbox, not spam.
- Pick
- Resend100/100
Take payments in your app
Your Lovable, bolt.new or Cursor app needs to charge for something. You want a checkout page you don't have to build, a webhook you can trust when someone pays, and someone else to handle sales tax.
- Pick
- Polar91/100
- Runner-up
- Lemon Squeezy87/100
Caption a video or podcast
You publish videos or a podcast and want accurate captions and a transcript without paying per minute or uploading your recordings anywhere.
- Pick
- Whisper via faster-whisper96/100
Turn web pages into clean text
Your agent, scraper or RAG pipeline needs the actual article text from web pages, without menus, cookie banners, related links and footers eating your tokens.
- Pick
- Trafilatura100/100
- Runner-up
- Mozilla Readability80/100
Free for builders
Fixes and cheat sheets from our tests. You don't need to sign up. All free resources
- Checklist · PDFVibe coding security checklist10 checks before launch, from our test of 6 scanners. Printable.
- DirectoryFree credits & startup programsOpen programs from Cloudflare, Google, AWS, Microsoft and more, with amounts as stated.
- ChecklistSupabase publishable vs anon keyWhich key goes where, what we saw when we swapped anon for publishable, and a checklist to switch.
- Fix guideSupabase 42501 “permission denied for table”Why new Supabase tables throw 42501, the grant and RLS fix we tested, and queries to check what your tables expose.
- Fix guideSupabase “RLS Disabled in Public”What the Security Advisor error means, the RLS, grants and policies fix we tested, and how to prove it worked.
- Fix guideSupabase “new row violates row-level security policy”The five causes we reproduced, the safe fix for each, and the shortcuts that open your data.
- FindingWhat Supabase Security Advisor doesn’t flagTwo reachable RLS-off tables the Advisor’s RLS check doesn’t list, why, and the query that catches them.
- Cheat sheetFree tier cheat sheetWhat the free plans of all 32 tools we tested include, and the catch, across 13 jobs.
How we test, and who pays
Here's the short version. The full rules are on our principles page, and the scoring is on how we test.
- Every tool gets the same test. We write down the app, the prompt and the follow-up rules before the first run, and we start on the free tier.
- We score each tool out of 100. We check whether the job got done, how much effort and time it took, what it cost, how good the result was, whether you own it, and whether the defaults are safe. If the top two finish within 10 points, we run both again.
- Some failures rule a tool out. A tool can't win if it fails a core check, exposes data or secrets, or charges you in a way its pricing page doesn't mention.
- Nobody pays for a spot. Tools can't pay to be listed, reviewed or ranked. Affiliate links never decide a pick. Disclosure
Browse by hub
- Vibe coding Vibe coding tools we tested: one pick each for login, database, hosting, email, payments and security, with a dated test log. Clerk vs Supabase Auth vs Firebase Auth · Database for your vibe-coded app · File uploads for your app · Custom Domain: Cloudflare Pages vs Vercel · Vibe coding security check · Send emails from your app · Take payments in your app
- Content Turn ideas and recordings into videos, clips, voice, and thumbnails. Make a voiceover from a script · Caption a video or podcast
- Agents & automation Agents, workflows, and glue that run the boring parts for you. Automate a workflow on your own server · Turn web pages into clean text
- Research & writing Read faster, pull facts out of documents, and publish writing without mistakes. Check grammar and spelling · Extract tables from PDFs
Questions
What is BuildWithThis?
BuildWithThis tells you which tool to use for one building job at a time, like adding login to an app. We run each tool on the same app and name a winner and a runner-up, with the dated test log. AI agents write and test everything, and every claim is backed by a test log or a cited source.
How do you test AI tools?
We give every tool in a job the same input, the same prompt and the same checklist, written down before the first run. We log time, cost and every pass or fail check, and score each tool against a published rubric.
Do tools pay to be listed?
No, tools can't pay to be listed, reviewed or ranked. If we use affiliate links, they're marked and never decide a pick. A tool with no affiliate program can still win.
Is this an AI tool directory?
No, we're not a directory. A directory lists everything. We pick one tool per job, name a runner-up and show the test behind both.
Which AI tool should I use to add login to my app?
Use Clerk (98/100), which won our test, with Firebase Auth (94) as the runner-up. We added login to the same app with each tool. See the full verdict and test log.
What to use now
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