About this app
Markdown has become one of the most important formats of the AI era. LLMs and coding agents use .md to structure answers, plans, prompts, documentation, code notes, and lasting knowledge. MDer gives those files a calm, native home on iPhone and iPad. WRITE WITH FOCUS Edit Markdown in a clean, responsive workspace with useful formatting shortcuts, word counts, reading time, and automatic local saving. READ LIKE A BOOK Switch into a genuinely separate reading experience—not a cramped preview. Enjoy carefully tuned serif typography, comfortable line length, generous spacing, and Paper, Sepia, or Night themes. BUILT FOR AI-ERA WORKFLOWS Open Markdown created by an LLM, refine a prompt, preserve an agent plan, review technical notes, or turn an AI response into durable knowledge. MDer works with the open .md format, so your writing is never trapped in a proprietary system. YOUR MARKDOWN, YOUR DEVICE • Import standard .md and plain-text files • Export and share clean Markdown anytime • Search titles and document contents • Favorite, pin, duplicate, and organize notes • Keep documents locally without creating an account • Use a layout designed for both iPhone and iPad MDer does not require an AI subscription and does not send your documents to an LLM. It is the focused reader and editor for the Markdown files that power modern AI, developer, research, and writing workflows.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 12, 2026 · 4:07 PM $2.99
Screenshots
