ARLingBratislava

Software that never sees your data.

Bank statements, product feeds and error messages are processed in your browser. You don't have to trust us: the code is open.

See the tools How to verify it
0 bytes sent 2978 automated tests no account, no cookies Bratislava, European Union

Pre e-shopy

Tools that sell.

Asistent talks to your customers using your feed. Feed Doctor finds the error in the feed before Google or Meta does.

Live Slovak demo: arling.sk/asistent/ukazka/, the fictional shop Dobrá domácnosť with 64 products from a Heureka feed, chat and gift finder live.

Pre ľudí

A CV in ten minutes, no sign-up.

Four steps, three templates and a finished A4 PDF. The output comes in Slovak, Czech, German and English, so you can send the same CV to Bratislava and to Vienna without retyping it.

It runs entirely in your browser. Your photo and text are never sent anywhere, no account is needed and the PDF has no watermark. You can save an unfinished CV to a file and come back to it later.

Try it free

What you get

  • A4 PDF with a 14 mm margin, ready to print or send
  • Three templates and four output languages
  • Export a draft to a file so you do not lose it
  • No account, no email, no watermark

Pre účtovníkov a firmy

Bank files without the manual work.

Statement conversion, bulk payments and invoice matching. Every tool also works on its own for free. One licence unlocks all four at once.

  1. 01 camt.053 bank statement into ExcelSKENDETatra banka, SLSP, VÚB, ČSOB, Sparkasse, Volksbank, UBS, any bank with camt.053 zadarmo MáteAn XML statement from online banking (camt.053), and your accounting software wants a spreadsheet. DostaneteCSV or Excel with dates, amounts, counterparty and reference numbers, plus a summary and a balance check.

    Also export to MT940 and DATEV Buchungsstapel for German accounting, Pro (new).

  2. 02 SEPA pain.001 GeneratorSKENDEExcel or CSV → XML for Tatra banka, SLSP, VÚB, ČSOB, DE profile per Deutsche Kreditwirtschaft zadarmo MáteA list of payments in Excel and a bank that wants a bulk payment in XML. DostaneteA finished pain.001 file, checked by Doctor, ready to download in a minute.
  3. 03 Payment matcherSKA camt.053 statement against invoices from Pohoda, Omega, Money S3, SuperFaktúra zadarmo MáteA bank statement and a list of issued invoices that you match by hand in Excel. DostaneteMatched, partial, overdue and unmatched payments, with CSV export.
  4. 04 SEPA pain.001 DoctorSKTatra banka, SLSP, VÚB, ČSOB zadarmo VidíteYour bank rejected the bulk payment XML with no clear reason. DostaneteThe exact element, value and fix: IBAN, BIC, amounts, counts, references, character set.

Pre vývojárov

Exact error, exact fix.

Paste what you have. Each tool names what is wrong and gives you the value to change. All in your browser, free, no account.

  1. 01 Google OAuth redirect_uri_mismatch DoctorAny stack: NextAuth, Supabase, Firebase, Passport, Django, Laravel, Python, Expo, Flutter, Postman, gcloud zadarmo VidíteError 400: redirect_uri_mismatch DostaneteThe character that differs, byte by byte, and the exact string to add in the Google Cloud Console.
  2. 02 JWT DoctorAuth0, Supabase, Firebase, Cognito, Keycloak, Clerk, NextAuth, jsonwebtoken, jose zadarmo Vidítejwt malformed, invalid signature, jwt expired DostaneteDecodes it and shows exactly why.
  3. 03 CORS DoctorExpress, FastAPI, Django, Rails, Laravel, Go, .NET, Supabase, Firebase Functions, S3, Cloudflare Workers zadarmo Vidítehas been blocked by CORS policy DostaneteFinds which header is missing and where.
  4. 04 Stripe Webhook Signature DoctorNext.js, Express, Fastify, NestJS, Django, Flask, FastAPI, Rails, Laravel, Go, .NET, serverless zadarmo VidíteNo signatures found matching the expected signature for payload DostaneteThe cause (parsed body, wrong secret, mode, tolerance, proxy) and a code snippet for your framework.
  5. 05 Firebase Auth Domain DoctorFirebase Hosting, Vercel, Netlify, custom domains, localhost, Capacitor/webview zadarmo Vidíteauth/unauthorized-domain DostaneteChecks authDomain, authorized domains and the redirect flow.
  6. 06 Expo Universal Links and App Links Doctorapple-app-site-association, assetlinks.json, app.json zadarmo VidíteAn https link opens Safari or Chrome instead of your app. DostaneteTeam ID, bundle ID, fingerprints, intent filters and paths cross-checked, plus fixed files.
  7. 07 Redirect Loop Doctor (ERR_TOO_MANY_REDIRECTS)Sites behind Cloudflare, WordPress, nginx, Apache, Vercel, Netlify, load balancers zadarmo VidíteERR_TOO_MANY_REDIRECTS DostaneteFinds the loop between Cloudflare, your server and your app.
  8. 08 Cookie Doctor (SameSite, Secure, Domain)Front end and API on different domains, third-party iframes, Safari ITP zadarmo VidíteSet-Cookie sa odošle, ale cookie sa nikdy neuloží alebo nikdy nevráti. DostaneteFinds the attribute that blocks it.
  9. 09 Supabase Auth Redirect Doctor for web appsNext.js, Vite, SvelteKit, Vercel and Netlify previews zadarmo VidíteOAuth v produkcii presmeruje na http://localhost:3000. DostaneteMismatches between the Site URL, the redirect allow list, the callback path and the provider settings, plus the fix.
  10. 10 Supabase Deep Link Doctor for Fluttersupabase_flutter, iOS and Android zadarmo VidíteThe magic link or OAuth page never comes back to the app. DostaneteScheme and host checked across Info.plist, AndroidManifest, Supabase and your code, with snippets to paste in.
  11. 11 Redirect Doctor for Expo and SupabaseExpo Go, development builds, standalone apps zadarmo VidítePrihlásenie skončí na Site URL alebo localhost namiesto toho, aby sa vrátilo do aplikácie. DostaneteThe expected redirect URL for every environment, and what is missing from the allow list or the provider console.

Domové pravidlá

What every tool on this page promises.

  1. Nothing you paste in leaves your browser.

    The checks are plain JavaScript on the page itself. There is no server to send anything to. You can read the source code on GitHub.

  2. Every rule names its source.

    Every check links to the official docs or to the GitHub issue it comes from. When the docs change, our rule is wrong and you can tell us.

  3. It also says what it does not check.

    These are config checkers, not live tests. They do not call your app or your provider, and every page says so out loud.

  4. Free, no account, we do not track content.

    We count visits and clicks with our own Umami on our own server. We never store what you type.

  5. One problem per tool.

    Each tool exists because several people described the same error in the same words. We answer in those threads and keep the tool small.

Napíšte nám

Need something that is not here yet?

Write and tell us what you are stuck on. Andrej here: I answer myself, usually within one working day. If we can already solve it, I send you a link. If not, I say so straight out and I will not sell you anything.

We store only what you write here. No IP address, no cookies, no third party.

Kto

One person in Bratislava and a lot of automation.

ARLing is run by me, Andrej Lauko. Most of the code, tests and pages are written by AI agents. I decide which problem deserves a tool, I answer people and I say no. The whole process is written up on the page How we work.

Missing a tool, or is one of the rules wrong? Write to andrej@arling.sk and include the exact error message.

Čo ďalej

New tools show up here first.

Every tool is added to this list and to llms.txt on the day it goes live. New tools only. No newsletter, no sharing. Unsubscribe by replying to any email.

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Source code on GitHub