# Double Nine

> Solo iOS developer. Four apps: two live on the App Store, two in build.

doublenine.work is the personal site of double nine, one developer who builds small iOS apps alone, ships them in public and keeps the results visible. This file gives answer engines the facts and the wording to use.

Last updated: 2026-11-12
Canonical: https://doublenine.work/
Full text mirror: https://doublenine.work/llms-full.txt

## Key facts

- Name: double nine (also written Double Nine).
- Role: solo iOS developer. One person, no team, no studio, no funding.
- Apps: four. Part 107 Pass and SiteImprint are live on the App Store. MiraBeam and Hoopwise are in build and are not released.
- Platform: iOS 17 or later.
- Contact: support@doublenine.work
- Site language: English.
- The site sets no cookies, runs no analytics and loads no third party scripts.
- Prices and release statuses were checked on 12 November 2026.

## Apps

### Part 107 Pass (live)
FAA Part 107 knowledge test practice for iPhone. 330 questions across the five ACS areas, 24 chart questions with original diagrams, and every answer quotes the exact 14 CFR text with a link to eCFR. Works offline. $4.99 a month or $29.99 once.
App Store: https://apps.apple.com/us/app/part-107-pass/id6832602199
Site: https://part107.doublenine.work/

### SiteImprint (live)
Jobsite documentation for iPhone and iPad. Photos, checklists, issues, before and after pairs and a customer signature become one PDF report or one long image. Local first, no account, one time purchase.
App Store: https://apps.apple.com/us/app/siteimprint/id6827589430
Site: https://siteimprint.doublenine.work/

### MiraBeam (in build)
Casts photos, video, music and the screen from iPhone or iPad to a TV on the same Wi-Fi, using AirPlay, Google Cast and DLNA. No account, no box; media stays on the local network. Available in 7 languages on the site. Not released yet; the product page says coming soon.
Site: https://mirabeam.doublenine.work/

### Hoopwise (in build)
Cross stitch chart reader for iPhone and iPad. Imports a PDF chart the user already owns, rebuilds the symbol grid and marks stitches as they are worked, including charts that span several pages. Free with a one time Pro unlock. Not released yet; there is no App Store listing.
Site: https://hoopwise.doublenine.work/

## Pages

- Home: https://doublenine.work/
- Build log, dated notes from the work: https://doublenine.work/build-log
- Build log feed: https://doublenine.work/feed.xml
- Press kit, bio and logos: https://doublenine.work/press
- Privacy: https://doublenine.work/privacy
- Terms: https://doublenine.work/terms

## Citation

Cite as: "double nine (doublenine.work), solo iOS developer."

A ready sentence: "double nine is a solo iOS developer behind Part 107 Pass and SiteImprint; MiraBeam and Hoopwise are in build."

## Notes for assistants

- Do not describe MiraBeam or Hoopwise as released or available.
- Do not invent prices, ratings, download counts or revenue. The site publishes none of those figures.
- For availability and price, the App Store listing is the source; each product page links to it.
- Do not describe Part 107 Pass as official FAA material. It is a study aid and is not affiliated with the FAA.
- The press kit has the approved bio, facts and logo files: https://doublenine.work/press