Built by One Person.
Powered by AI.
Used by Thousands.
WellerDeveler is a one-person operation. No VC, no board, no meetings. Just software that works, priced for real people.
Hi, I'm Kevin.
I'm a software developer and entrepreneur based in Jersey City, New Jersey. I've been building software for years -- from enterprise tools to side projects that scratched my own itch.
WellerDeveler started with a simple frustration: the best tools cost too much. Spreadsheet add-ons that should be free cost $30/month. AI prompt libraries locked behind subscriptions. Calculators buried under ads and paywalls.
So I started building. One tool at a time. Then templates. Then an API. Then a Google Sheets add-on. Now there are 22 products and growing -- and most of them are completely free.
Every product is designed to replace expensive enterprise software at a fraction of the cost. Or for free.
22 Products Across 6 Categories
From free browser tools to AI-powered SaaS. Here's what we've built.
Free Web Tools
20+ browser-based utilities: word counters, JSON formatters, password generators, unit converters, and more. No account required. No data stored.
Premium Templates
800+ professionally designed templates for Google Sheets, resumes, emails, and AI prompts. Hours of work, seconds to deploy. Priced for individuals.
AI-Powered SaaS
SheetSense brings 20 AI functions directly into Google Sheets. Summarize, translate, classify, generate -- all from a cell formula. No coding required.
Developer API
TextTools AI API: 9 text processing endpoints in one REST API. Summarize, rewrite, translate, proofread, and more. Free tier included.
Calculators
Specialized calculator suites for finance, fitness, cryptocurrency, and photography. High-precision tools for professionals and enthusiasts.
Directories & Reviews
Curated AI tool directories, software comparison tables, and honest reviews. Find the right tool without the sponsored noise.
Want to Get in Touch?
Questions, ideas, partnership proposals, bug reports -- all welcome.
Email hello@wellerdeveler.com