Tool library
Free tools for developer growth experiments
Twenty-two focused utilities built for indie developers, SaaS founders, and product builders. Each tool targets a single task — AI search visibility, launch copy, landing page SEO, pricing page drafts, or everyday dev work — and delivers a useful output without login, API keys, or token cost.
Pick a tool below, enter a few details about your product, and get a ready-to-use result in seconds. No onboarding. No waiting. Just practical help for the parts of building software that aren't writing code.
How it works
Three steps from idea to output.
Browse the library below. Each card shows the tool name, category tag, and a one-sentence summary. Click any card to open the full tool page with input fields and output area.
Fill in a few fields — your product name, URL, target audience, and any extra context. The form adapts to each tool's purpose so you only answer what matters.
Hit generate and you get a complete output — a visibility assessment, a launch copy draft, a formatted checklist, or a validated expression. Copy it, tweak it, ship it.
SEO & GEO
Get found — in search engines and AI answers.
Generative engine optimization and search visibility tools. Check how AI search engines see your site, audit your landing page SEO, and preview social cards before you share.
AI Search Visibility Checker
Check how your site appears in AI search results like ChatGPT, Perplexity, and Gemini.
Open toolSEOLanding Page SEO Roast
Get a blunt SEO audit of your landing page — title tags, headings, content gaps, and more.
Open toolSEOSocial Card Previewer
Preview how your website looks when shared on X/Twitter, LinkedIn, Discord, and Slack.
Open toolSEOOG Image & Meta Tag Checker
Check your page's Open Graph, Twitter Card, and meta tags — see exactly how your link previews on social media.
Open toolLaunch & Copywriting
Ship faster with launch-ready copy and checklists.
Go-to-market tools for indie developers. Generate Product Hunt launch copy, SaaS pricing page drafts, and app launch checklists so you ship faster and skip the blank-page paralysis.
Product Hunt Launch Copy Generator
Generate Product Hunt tagline, description, and first comment draft for your launch.
Open toolCopywritingSaaS Pricing Page Copy Generator
Generate pricing page copy, plan names, feature bullets, and FAQ content for your SaaS.
Open toolLaunchApp Launch Checklist Generator
Generate a custom launch checklist for your app based on your store type and target market.
Open toolDeveloper Utilities
Everyday tools that run in your browser.
Everyday tools that run entirely in your browser — regex tester, cron expression builder, JSON formatter, diff checker, UUID generator, and Base64/URL/HTML encoder. No server round-trips, no data leaves your machine.
Regex Tester
Test and debug regular expressions in real time with match highlighting and group capture.
Open toolDeveloper UtilityCron Expression Generator
Build cron expressions visually with an interactive schedule helper and human-readable output.
Open toolDeveloper UtilityJSON Formatter & Validator
Format, validate, minify, and explore JSON data instantly in your browser.
Open toolDeveloper UtilityBase64, URL & HTML Encoder / Decoder
Encode and decode Base64 strings, URL-encode text, and escape HTML entities instantly in your browser.
Open toolDeveloper UtilityDiff Checker — Text & Code Compare
Compare two blocks of text or code side by side and see exactly what changed, added, or removed.
Open toolDeveloper UtilityUUID & ULID Generator
Generate random UUIDs (v4), ULIDs, and copy them instantly. Batch generate up to 100 at once.
Open toolDeveloper UtilityFavicon Generator — ICO, PNG & Apple Touch Icon
Upload an image and get a complete favicon package: .ico, all PNG sizes, Apple Touch Icon, and HTML code.
Open toolDeveloper UtilityColor Contrast Checker — WCAG AA/AAA Accessibility
Check text-background color contrast ratios against WCAG 2.1 AA and AAA standards. Instant feedback for accessible design.
Open toolDeveloper UtilityURL Slug Generator — SEO-Friendly Permalink Creator
Convert any text into a clean, SEO-friendly URL slug. Remove special chars, lowercase, and join with hyphens.
Open toolDeveloper UtilityLorem Ipsum Generator — Placeholder Text for Design & Dev
Generate customizable lorem ipsum placeholder text. Choose paragraphs, sentences, or words — with options for fun themed variants.
Open toolDeveloper UtilitySQL Formatter & Beautifier
Format messy SQL queries with proper indentation, keyword casing, and line breaks — instantly in your browser.
Open toolDeveloper UtilityJWT Decoder
Decode and inspect JWT tokens instantly — view header, payload, signature, and check expiration.
Open toolDeveloper UtilityImage Compressor
Compress JPG, PNG, and WebP images right in your browser — adjust quality, preview results, and download smaller files.
Open toolDeveloper UtilityYAML Validator & JSON Converter
Validate YAML syntax with line-level error reporting and convert valid YAML to JSON — entirely in your browser.
Open toolDeveloper UtilityJSON to CSV Converter
Convert JSON arrays to CSV format instantly — auto-detect headers, flatten nested objects, and download as .csv file.
Open toolCommon questions
What you need to know before you start.
Are these tools really free?
Yes. All twenty-two tools are free to use with no login, no API keys, and no token cost. We built them to help indie developers move faster, and keeping them free means more people can benefit.
Do you store my data?
No. Every tool processes your input entirely in your browser. Product names, URLs, audience descriptions, and generated output never leave your computer. There are no analytics events tied to your tool inputs.
How are these different from other free tools?
Most free developer tools are generic utilities. These are built specifically for indie founders and SaaS builders — they understand concepts like launch copy, pricing tiers, ASO checklists, and GEO optimization. The output is tailored to the context of shipping and growing a software product.
What if I need deeper help?
Each tool page includes a consultation CTA if you want a human review of your launch strategy, SEO, or pricing. For App Store and Google Play launch assets — screenshots, captions, localization — visit our sister site LaunchAssetKit, which is built specifically for mobile app store publishing.
Can I suggest a new tool?
We add tools based on what indie developers actually need. If you have a suggestion for a tool that would help you ship or grow faster, reach out through the contact page — we read every submission.
Ready to start?
Pick a tool and ship something today.
Every tool on this page was built to solve one specific problem for indie developers. No fluff. No upsells. Just practical output you can use immediately.