What I've built
Everything here was built by one person, and everything here is out now on the stores linked below. No team, no investor roadmap. Just apps I wanted to exist.
Learn Japanese kanji the way a first-year course teaches it: 314 JLPT N5 and N4 kanji, 1,557 words, hiragana and katakana with stroke order, and 1,100 real sentences that open up as you learn the kanji in them.
- Meaning, reading and writing reviewed on separate schedules — because a kanji is not one fact
- Every reading taught in the words that use it (生 is セイ in 学生, い in 生きる, う in 生まれる)
- Writing checked stroke by stroke on genkouyoushi squares, plus printable practice sheets
- Hiragana and katakana charts with stroke order for every kana
- Free reference: the full JLPT N5 and N4 kanji lists
- Works offline. No account, no ads, no subscription.
A daily word puzzle with a twist. Each of four words comes with three clues of decreasing difficulty. Solve it on the hardest clue and score maximum points. A fresh set every day.
- Four words per day, each with Purple, Yellow, and Green clues
- Solve on Purple (hardest) for 3 pts, Yellow for 2, Green for 1
- Clue types: double definitions, acrostics, anagrams, reversals, homophones, and more
- Max score of 12. Can you go perfect?
- Daily streaks, stats, and one-tap shareable results
The complete International and Inland Navigation Rules, plus the drills the Rules of the Road exam actually tests. Every light and shape is drawn as original artwork you can rotate to any aspect.
- Both rule sets in full with the annexes, and full-text search across them
- Every question from the USCG sample examinations (Q100, Q300, Q301), free forever
- Lights and shapes drawn from the rule text at run time, rotatable to any aspect
- Synthesized sound signals, full exam simulation and progress tracking
- Every source named with its retrieval date and SHA-256, so the text is checkable
- Works offline, no account, nothing collected
The reference and calculator set a US amateur radio operator reaches for at the bench, in the truck, or in a field with no signal. Pay once, no subscription, no account, no network.
- Every US band from 160 meters to 23 centimeters, drawn as a bar you can read at a glance
- Privileges by license class from 47 CFR Part 97, with the section cited on every segment
- Q-codes, an RST decoder, CW abbreviations, and a callsign speller for the ITU phonetics
- Antenna calculators: dipole, inverted V, quarter-wave vertical, full-wave loop and J-pole
- RF math: dB and dBm, SWR, return loss, coax loss for 15 lines, ERP and EIRP
- Includes the December 2025 changes to 60 meters
- On iPhone and iPad it also includes FCC exam prep, in the same $2.99 (the App Store name is Band Plan & GROL Exam Prep)
Study software for the FCC commercial radio operator examinations — the GROL that avionics and marine electronics technicians need, the GMDSS licenses, the Ship Radar Endorsement and the Marine Radio Operator Permit.
- Every question in the FCC’s published pools for Elements 1, 3, 6, 7, 7R, 8 and 9, with the figures
- Element 1 (144 questions) is free forever; one purchase unlocks every other element
- Spaced repetition: what you miss comes back tomorrow, collected in a Due tab
- Practice exams that mirror the real paper — length, topic spread, passing score and timer
- A readiness estimate per element, so you know when to book
- Each pool’s approval date, FCC link and SHA-256 shown in the app
- On iPhone and iPad the same pools are included in Band Plan & GROL Exam Prep for $2.99
A serious vocabulary tool for Biblical Hebrew students. Over 5,000 words drawn from 8 of the most widely used introductory textbooks, with spaced repetition that adapts to what you actually know.
- Flashcards, quizzes, matching games and guided review modes
- SM-2 spaced repetition: study smarter, not longer
- Covers the top 1,000 most frequent words in the Hebrew Bible
- Supports Lambdin, Van Pelt, Weingreen, Kelley and more
- Streak tracking and retention stats to keep you honest
- Fully offline, no account required, no data collected
The same study engine, pointed at Koine Greek. Word lists for six widely used introductory grammars — Mounce, Machen, Duff and more — organized by chapter, plus the 1,000 most frequent words in the New Testament.
- Textbook lists for Mounce, Machen, Duff, Long, Swetnam and Hewett, by chapter
- The top 1,000 words of the Greek New Testament, ordered by frequency
- Flashcards, quizzes, matching games and guided review modes
- SM-2 spaced repetition, so review time goes where it is needed
- Streak tracking and retention stats
- Fully offline, no account required, no data collected
Every word of Biblical Aramaic — the language of Daniel 2–7, Ezra 4–7 and Jeremiah 10:11 — as flashcards. The whole vocabulary is 675 words, so the app covers all of it, in the Ezra SIL square script with vowel points.
- Frequent Words: all 675 words, commonest first
- Reading tracks for Daniel and Ezra, in the order you meet each word
- Flashcards, quizzes, matching games and guided review, with SM-2 spaced repetition
- Alphabet and vowel decks, search, progress tracking and custom review lists
- On iPhone and iPad: the same 675 words are a one-time unlock inside Biblical Hebrew Vocabulary
- Vocabulary derived from the Westminster Leningrad Codex, not a publisher’s list
- Fully offline, no account required, no data collected
The digital version of pulling a folded slip out of a hat — for school fundraisers, class prize days, team banquets and office potlucks. One name appears, in a serif big enough to read from the back of the hall.
- Paste a whole roster — one name per line or comma separated
- Verifiable fairness: the seed fingerprint is published before the draw, the seed revealed after
- Deal everyone into 2–6 teams, or draw numbers instead
- 30 names free; a single $4.99 payment adds unlimited names and live rooms
Somebody’s parent is keeping score on a napkin. This is that, but readable from the bleachers — tap a team to score, with a number enormous on purpose.
- Sport presets, not separate apps: basketball +2/+3, volleyball sets, or just counting
- Works with no signal; no account, no ads — not in the free version either
- Per-quarter and per-set breakdowns, and an undo button always in reach
- $4.99 once adds live sharing, a second scorer, up to eight teams and colours
Your softener ran out of salt and nobody noticed for weeks. This works out when the tank will be empty and reminds you a few days before — no sensor to buy, nothing to install.
- Days of salt left and a refill date, from your tank, hardness and household size
- Quick level checks teach it your real salt use
- One tank for the whole house: anyone logs it, the reminder clears for everyone (iPhone)
- Free reference: how much salt a water softener uses
- No account, no ads, no subscription. $2.99 once adds problem alerts, sharing and the full maintenance schedule.