About BioOnSun
Building bioinformatics tools that solve small, everyday annoyances.
What is BioOnSun?
BioOnSun (juonsun.com/bioonsun) is a free collection of online bioinformatics tools built for researchers, students, and hobbyist biologists who work with DNA and RNA sequences. The goal is simple: let anyone run the calculation they need directly in their browser, without sign-up or installation.
Why we built it
Preparing an experiment or working through coursework often means doing small, repetitive tasks — like reversing a sequence and swapping it for its complement. Many existing tools are cluttered with ads, feel dated on mobile, or require an account you don't really need. BioOnSun started as a personal project to fix these small frictions, one tool at a time.
Our principles
- Privacy first: sequence calculations run in your browser (JavaScript), not on our servers. Nothing you paste in is transmitted or stored.
- Free, with minimal ads: core tools stay free, and any advertising is placed to avoid getting in the way of the tool itself.
- Accuracy: calculation logic is checked against established standards such as the IUPAC nucleotide code conventions.
- Ongoing expansion: after the Reverse Complement calculator, the GC Content Calculator, the DNA→Protein Translator, the FASTA Cleanup Tool, and the Sequence Alignment tool, we'll keep adding commonly needed tools based on user feedback.
Who runs this
BioOnSun is built and maintained by an independent developer. Bug reports, feature requests, and collaboration inquiries are always welcome via the contact page.
Changelog
- August 2026 — Launched the Sequence Alignment tool (Needleman-Wunsch global and Smith-Waterman local alignment with affine gap penalties, BLOSUM62 for protein sequences, async computation via a Web Worker). Launched the FASTA Cleanup Tool (line-wrap re-formatting, whitespace/digit stripping, auto-naming headerless sequences, duplicate header fixes). Launched the GC Content Calculator (GC/AT content, GC skew, multi-FASTA, sliding-window chart). Launched the DNA/RNA → Protein Translator (all 6 reading frames, 18 genetic code tables, automatic ORF detection).
- July 2026 — BioOnSun launches with the Reverse Complement calculator.