Developer tools, in the browser
16 tools. No account, nothing to install, free to start.
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API & HTTP
Backend not ready? Get a working REST API from your JSON.
Mock API StudioFree to start Open API & HTTP
See every webhook the moment it lands, and check its signature.
Hookwatch Webhook TesterFree to start Open Developer Utilities
Cron, in plain English. See the next runs before you deploy.
Cron StudioFree to start Open Web Security
Stop guessing your Content-Security-Policy.
CSP FoundryFree to start Open Database
Diff two schemas and get the migration, checked in your browser.
Schema Diff StudioFree to start Open Team & Collaboration
Code together from one link. Live cursors, no sign-up.
PairPadLive rooms · Free to start Open Email & DNS
Check SPF, DKIM and DMARC for any domain in seconds.
MailAuth DoctorFree to start Open Images & Media
QR codes that keep working, and you can edit them later.
QR StudioFree to start Open Debug and ship faster
Mock it, inspect it, diff it, lock it down.
Know when it breaks
Pings, uptime and schedules you can read.
Make it, share it, do it together
Rooms, cards and codes.
Browser extensions
Chrome and Firefox. Free to start, nothing to sign up for.
SpecsheetTurn any website’s design into a Markdown brief an AI can rebuild: colours, fonts, spacing, components, screenshots and placeholder images.Chrome · Firefox · Free to start
JobfitSee how well your resume matches any job, which keywords are missing and whether an ATS can read it. Then fill in the application.Chrome · Firefox · Free to start
TablekitCopy any web table or list to Excel, CSV or Sheets, with a preview that warns you about merged cells, empty rows and missing data first.Chrome · Firefox · Free to start
CarryoverSave any AI chat as Markdown, PDF, Word, HTML or JSON, or cut it into parts to carry into another AI.Chrome · Firefox · Free to start
SnipboxType a shortcut like ;sig in any text box and get your saved reply, with fill-in fields. A local snippet library: no account, nothing synced.Chrome · Firefox · Free to start
PagewatchWatch part of a web page and get told exactly what changed, in plain words, with fewer false alarms.Chrome · Firefox · Free to start
LinklensCheck the links and images on a page and get a report that says what each answer really proves: confirmed missing, redirects, blocked, or could not reach.Chrome · Firefox · Free to start
ImagepackCollect the images you may use from any page, review them, and export an organized ZIP with predictable file names and a manifest.Chrome · Firefox · Free to start
Ready-made setups
149
Bomdesk: CycloneDX vs SPDX CycloneDX or SPDX? What each SBOM format is for Bomdesk: Cargo.lock Generate an SBOM from Cargo.lock Bomdesk: go.sum / go.mod Generate an SBOM from go.sum or go.mod Bomdesk: yarn.lock Generate an SBOM from yarn.lock (classic and Berry) Bomdesk: pnpm-lock.yaml Generate an SBOM from pnpm-lock.yaml Bomdesk: requirements.txt Generate an SBOM from requirements.txt (pinned Python packages) Bomdesk: find GPL Find GPL and other copyleft packages in package-lock.json Bomdesk: npm package-lock Generate an SBOM from package-lock.json, with licences and advisories Bomdesk: customer questionnaire A customer asked for your SBOM? Here is how to answer in ten minutes Bomdesk: licence report Check the licences of every npm dependency without installing anything 
Cronwatch: Email alerts Want an email when a cron job fails or never runs? Get one with a single curl line. Cronwatch: Linux cron Not sure your Linux cron jobs ran last night? Monitor each crontab line with one URL. Cronwatch: GitHub Actions GitHub Actions cron not triggering? Get alerted when a scheduled workflow stops running. Cronwatch: Backups Would you know if last night's backup failed? Get an email when a backup job goes quiet. Cronwatch: Python scripts Scheduled Python script stopped running? Ping from the script, get alerted when it stops. Cronwatch: Windows tasks Windows scheduled task not running? Get an email when a task stops reporting in. Cron Studio: Every 5 minutes Cron every 5 minutes: the expression, the catch, and the next run times Cron Studio: Weekdays 9 AM Cron expression for weekdays at 9 AM, in your own time zone Cron Studio: Every Monday 9 AM Cron every Monday at 9 AM: the expression and the next five Mondays Cron Studio: Last day of month Cron on the last day of the month: Quartz has L, crontab needs a trick Cron Studio: First Monday of month Cron on the first Monday of the month: why 0 9 1-7 * 1 does not work Cron Studio: Quartz & Spring cron Quartz and Spring cron expressions: six fields, ?, L, W and # Cron Studio: AWS EventBridge cron AWS EventBridge cron expressions: six fields, a year, and a required ? Cron Studio: Kubernetes CronJob Kubernetes CronJob schedule: the cron syntax, timeZone and missed runs Cron Studio: GitHub Actions cron GitHub Actions cron schedule: UTC only, 5-minute minimum, and delays Cron Studio: Crontab checker Check your crontab for bugs: percent signs, PATH, overlaps and dead schedules CSP Foundry: Firebase Hosting Content-Security-Policy for Firebase Hosting: static headers, so hashes not nonces CSP Foundry: Refused to load the script Refused to load the script: the Content-Security-Policy error, decoded CSP Foundry: Refused: inline script Refused to execute inline script: the CSP error, with the hash to allow it CSP Foundry: Next.js nonce Content-Security-Policy for Next.js: nonces, strict-dynamic and what they cost CSP Foundry: Google Tag Manager & GA4 Content-Security-Policy for Google Tag Manager and Google Analytics 4 CSP Foundry: Stripe.js Content-Security-Policy for Stripe.js: the exact script, frame and connect sources CSP Foundry: Google Fonts Content-Security-Policy for Google Fonts: style-src and font-src CSP Foundry: Fix unsafe-inline Fix unsafe-inline in your CSP: what to replace it with, step by step CSP Foundry: Report-Only rollout Content-Security-Policy-Report-Only: roll out a CSP without breaking your site CSP Foundry: WordPress Content-Security-Policy for WordPress: start loose in Report-Only and tighten 
CSV Reconcile: By key column Two CSV files that should match? Compare them by key and list every difference CSV Reconcile: Product catalog (SKU) Product catalog changed? Compare two CSV exports by SKU and see price and stock moves CSV Reconcile: Customer lists (email) Customer list and mailing list out of sync? Compare two CSV files by email address CSV Reconcile: Inventory snapshots Inventory counts changed between two snapshots? Compare the CSV files by warehouse and SKU CSV Reconcile: Bank vs ledger Bank statement and ledger don't agree? Reconcile the two CSV files by reference CSV Reconcile: Different column names CSV files use different column names? Match the columns and compare them by key CSV Reconcile: Duplicate keys Duplicate IDs make a CSV comparison unreliable? Find the ambiguous keys CSV Reconcile: Ignore order and case Same data, columns in a different order and mixed case? Compare the CSV files anyway CSV Reconcile: IDs missing zeros IDs like 00417 in one file and 417 in the other? Compare the CSV files anyway 
HAR Desk: Offline viewer Open a HAR file without uploading it: requests, headers, timings and bodies HAR Desk: Failed requests Find the failed requests in a HAR file: 4xx, 5xx and blocked calls in one list HAR Desk: Remove auth headers Remove Authorization headers and session cookies from a HAR before you share it HAR Desk: Slowest requests Find the slowest requests in a HAR file and see where the time went HAR Desk: Before sharing Sanitize a HAR before sharing it with support, with a review of every change HAR Desk: Remove cookies Remove cookie values from a HAR file and keep the cookie names HAR Desk: Compare two HARs Compare two HAR files: which requests were added, removed or got slower HAR Desk: Redact JSON fields Redact JSON fields in HAR request and response bodies by path HAR Desk: Third-party requests List the third-party requests in a HAR file: hosts, counts and bytes HAR Desk: Remove bodies Remove request and response bodies from a HAR file and keep the timings MailAuth Doctor: SPF too many lookups SPF "too many DNS lookups" (permerror): count them exactly and fix it MailAuth Doctor: Google + Mailchimp SPF SPF record for Google Workspace and Mailchimp: the record and the lookup count MailAuth Doctor: Microsoft 365 + SendGrid SPF SPF record for Microsoft 365 and SendGrid: merge them without breaking SPF MailAuth Doctor: Amazon SES + Google SPF SPF record for Amazon SES and Google Workspace: one record, how many lookups MailAuth Doctor: DKIM selector finder DKIM selector finder: which selectors does your domain publish? MailAuth Doctor: DMARC XML viewer DMARC XML report viewer: read aggregate reports and see why senders fail MailAuth Doctor: DMARC none to reject Move DMARC from p=none to reject: a safe step-by-step ramp MailAuth Doctor: Gmail sender requirements Gmail sender requirements: what DNS can show and what it cannot MailAuth Doctor: MTA-STS generator MTA-STS generator: the policy file, the DNS record and the rollout order MailAuth Doctor: Multiple SPF records Multiple SPF records error: why it breaks SPF and how to merge them Mock API Studio: Users API Need a fake users REST API for your frontend? Get a working /users endpoint now Mock API Studio: From OpenAPI (Pro) Have an OpenAPI spec but no backend? Turn the YAML into a live mock API with Pro Mock API Studio: json-server online Want json-server without installing it? Paste your db.json and get a live URL Mock API Studio: Products API Need a fake products API with images? Get a working /products endpoint now Mock API Studio: Pagination Testing pagination or infinite scroll? Get a fake API with real pages to walk Mock API Studio: Todos API Building a todo app? Get a fake todos REST API that saves your changes Mock API Studio: E-commerce API Building a shop frontend? Get a mock e-commerce API with customers and orders Mock API Studio: Blog posts API Need a fake blog API? Get posts, comments and authors that link together Mock API Studio: Employees API Need a dummy employee API for a CRUD demo? Get a working /employees endpoint Mock API Studio: Recipes (search) Need a fake API with search? Get a recipes endpoint that answers ?q= queries 
Cardsmith: Next.js Dynamic OG images for Next.js without @vercel/og, edge functions or a font setup. Cardsmith: Astro Open Graph images for every Astro page from one template and a URL, with no build step. Cardsmith: X / Twitter card Make a Twitter card image that shows as a large preview when your link is shared on X. Cardsmith: Hugo OG images for every Hugo page from a single meta tag that uses the page title. Cardsmith: Blog posts Blog post social images that match your brand, generated from each post title. Cardsmith: Docs pages Social preview cards for documentation pages, so shared docs links show the page title. PairPad: JavaScript Need to write JavaScript together? Share a live editor that runs code for everyone PairPad: Coding interview Running a coding interview? Send one link to a shared editor that runs the code PairPad: SQL playground Need to work through SQL with someone? Run queries on a shared SQLite database PairPad: TypeScript Need to share TypeScript live? Edit it together and run it with a shared console PairPad: JS interview questions Practising JavaScript interview questions? Implement debounce and Promise.all live PairPad: SQL interview Practising SQL interview questions? Run them on an employee table with a partner PairPad: HTML & CSS Building a page with someone? Edit HTML, CSS and JS together with a live preview PairPad: React (JSX) Want to try a React component with someone? Edit JSX together with a live preview PairPad: Python (no run) Need to share Python code live? Edit and review it together in one shared editor PairPad: LeetCode with friends Want to solve LeetCode-style problems with friends? Race two solutions in one room 
PDF Redact: Redact a PDF offline Redact a PDF in your browser without uploading it PDF Redact: Permanently redact a PDF Permanently redact a PDF so the text cannot be recovered PDF Redact: Redact without Adobe Redact a PDF without Adobe Acrobat, in your browser PDF Redact: Remove names from a PDF Remove names from a PDF: find every occurrence and black it out PDF Redact: Redact a PDF, no sign-up Redact a PDF with no account, no sign-up and no upload PDF Redact: Redact email addresses Redact every email address in a PDF in one pass PDF Redact: Redact SSN-like numbers Redact Social Security style numbers (123-45-6789) in a PDF PDF Redact: Black out text in a PDF Black out text in a PDF so it cannot be copied back out PDF Redact: Redact card numbers Redact credit card numbers in a PDF, checked with the Luhn test PDF Redact: Redact dates in a PDF Redact dates and dates of birth in a PDF 
Sprint Poker: Fibonacci Story point votes all over the place? Run Fibonacci planning poker with hidden votes Sprint Poker: Jira backlog Planning poker for a Jira backlog: paste issues free, or drop the CSV export with Pro Sprint Poker: T-shirt sizing Story points feel too precise? Estimate with T-shirt sizes in a free online session Sprint Poker: Teams & Zoom calls Estimating on a Teams or Zoom call? Share one link, vote on a 60-second clock, auto-reveal Sprint Poker: Modified Fibonacci Arguing 21 vs 34? Estimate with the modified Fibonacci deck: ½ to 13, then 20, 40, 100 Sprint Poker: Hours estimation Need task estimates in hours? Run planning poker with an hours deck (custom deck, Pro) Sprint Poker: Azure DevOps work items Estimating Azure Boards work items? Paste them free, or import the query CSV with Pro Sprint Poker: Custom cards (Pro) Your team needs a 6 or a 10? Make your own planning poker cards with Sprint Poker Pro Sprint Poker: Story points vs days How many days is a story point for your team? Compare estimates with cycle time (Pro) QR Studio: Wi-Fi QR code Wi-Fi QR code generator: guests join your network with one scan QR Studio: WhatsApp QR code WhatsApp QR code generator: open a chat with a message already typed QR Studio: Contact card QR code Contact card QR code: share your details with one scan QR Studio: QR code no expiration QR code with no expiration: free codes that keep working QR Studio: Restaurant menu QR code QR code for a restaurant menu: change the menu without reprinting QR Studio: Google review QR code Google review QR code: ask customers for a review with one scan QR Studio: QR code scan tracking QR code scan tracking: count scans by day and device QR Studio: Email QR code Email QR code: open a message with the address, subject and body filled in QR Studio: SMS QR code SMS QR code: open a text message with the number and text filled in QR Studio: QR code SVG for print QR code as SVG for print: a sharp vector code at any size Schema Diff Studio: Postgres add column Adding columns to a Postgres table? Generate the ALTER TABLE migration from two schemas Schema Diff Studio: Compare pg_dump files Compare two pg_dump schema files and get the migration between them Schema Diff Studio: Postgres rename column Renaming a Postgres column? Get RENAME COLUMN, not a DROP and ADD that loses data Schema Diff Studio: Postgres ER diagram Need an ER diagram of a Postgres schema? Paste the SQL and see it drawn Schema Diff Studio: Postgres add index Adding indexes to an existing Postgres table? Get the CREATE INDEX migration, checked Schema Diff Studio: SQLite add column Adding columns to a SQLite table? See which ADD COLUMN works and which needs a rebuild Schema Diff Studio: Postgres enum change Changing a Postgres enum? Add values in place, or recreate the type to remove one Schema Diff Studio: SQLite drop column SQLite drop column failing, or need to change a type? Get the table rebuild script Schema Diff Studio: Postgres add foreign key Adding a foreign key to an existing Postgres table? Get the ADD CONSTRAINT migration Schema Diff Studio: SQLite ER diagram Need an ER diagram of a SQLite database? Open the .db file or paste .schema output Schema Diff Studio: Postgres change column type Changing a Postgres column type? Get ALTER COLUMN TYPE ... USING, flagged for review Schema Diff Studio: Postgres add constraints Adding NOT NULL, UNIQUE or CHECK to an existing Postgres table? Get the ALTER script 
Statusboard: Statuspage alternative A simple Statuspage alternative: public status page and uptime checks, free for one page. Statusboard: API status A public API status page that checks your health endpoints every 5 minutes. Statusboard: SaaS A status page for your SaaS: app, API and email delivery, with incidents and uptime bars. Statusboard: Uptime An uptime status page with daily uptime bars, generated from checks every 5 minutes. Statusboard: Service status A service status page your customers can check before they contact support. Statusboard: Server status A server status page for your sites and services, checked from outside every 5 minutes. Hookwatch Webhook Tester: Stripe Stripe webhook signature failing? Inspect the event and verify it in your browser Hookwatch Webhook Tester: GitHub GitHub webhook signature check failing? See the delivery and verify X-Hub-Signature-256 Hookwatch Webhook Tester: Clerk Clerk webhook verification failing? Inspect the Svix delivery and check the signature Hookwatch Webhook Tester: Shopify Shopify webhook HMAC not matching? Capture the delivery and verify X-Shopify-Hmac-Sha256 Hookwatch Webhook Tester: Any HMAC-SHA256 Custom HMAC-SHA256 webhook not verifying? Check header, encoding and signed string here Hookwatch Webhook Tester: Slack slash command Slack slash command or request signature failing? Capture it and verify X-Slack-Signature Hookwatch Webhook Tester: WooCommerce WooCommerce webhook missing or signature wrong? Check X-WC-Webhook-Signature here Hookwatch Webhook Tester: Twilio SMS Twilio signature validation failing? Capture the SMS webhook and check X-Twilio-Signature Hookwatch Webhook Tester: Linear Linear webhook signature not verifying? See the delivery and check Linear-Signature Hookwatch Webhook Tester: Standard Webhooks / Svix Standard Webhooks signature not verifying? Inspect webhook-signature and check it here Hookwatch Webhook Tester: Square Square webhook signature invalid? Capture the event and check the URL-plus-body HMAC All tools
Developer Utilities
2Monitoring
1Web Security
1Data & Spreadsheets
1API & HTTP
3Email & DNS
1Images & Media
2Team & Collaboration
2Documents & Privacy
1Database
1Status & Incidents
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