David Kaylor

Web products

Six live products and one concept. All of them run on Cloudflare, and three take payments through Stripe.

NACHA Navigator

Live

Free, private tools for bank payment files. Open an ACH file and see every 94-character record decoded field by field and checked against the NACHA rules, then generate a reversal in a few clicks. It also reads X9.37 check-image files and BAI2 statements, and builds valid NACHA files from a form or a REST call. Files never leave the browser.

tools in one suite: 4
file formats decoded: 3
bytes uploaded: 0

React 19 Vite Tailwind Hono on Workers D1 Stripe Web Workers

Started in 2023 as an Angular parser, launched on Replit in 2025, and rebuilt on Cloudflare in October 2026.

Visit site

nacha-navigator.com

NACHA Navigator home page with a file drop zone

Kaylor Ranks

Live

A college football Top 25 built only from stats. It ignores conference and reputation and uses no preseason poll: every team starts at zero and is rated on opponent-adjusted game stats from ESPN play-by-play, with weights learned from ten seasons of data. It rebuilds every week, grades itself against the AP poll, and publishes a backtest showing the Vegas line is still the better forecast.

training seasons: 2014–24
games backtested: 5,601
preseason bias: None

Python (stdlib only) bootstrap error bars static site on Workers

Extras: weekly Picks, a Matchup predictor, Bias Meter, Upset Meter, Odds Watch, Conference Ladder and the Circle of Chaos.

Visit site

kaylorranks.com

quote-zap.com

QuoteZap

Live

Branded quotes and invoices for solo service pros. Describe the job in plain English, AI drafts the scope and line items, and the customer gets a quote link and PDF, accepts online, then pays the invoice.

to a sent quote: 60 s
Pro, unlimited: $29/mo

Next.js on Workers (OpenNext) Supabase Claude API Stripe Resend

Visit site

forever-scan.com

ScanTrail

Live

QR codes you can edit after printing. Each code points at a permanent short link you can redirect any time, and every scan is logged at the edge with country, device and referrer.

free dynamic codes: 3
Pro plan: $1/mo

Hono on Workers D1 Stripe subscriptions PBKDF2 auth nonce CSP

Visit site

date-card.app

DateCard

Live

Your dating profile as a business card. Build it on the web (an iOS app is on the way), publish, and share one link or QR code anywhere. No matching, no subscriptions and no accounts: a secret edit token saved on your device is the only key.

photos per card: 10
accounts needed: 0

SwiftUI Workers D1 KV Sign in with Apple

Visit site

tagalong.tollmeapi.workers.dev

Tagalong

Live

Find people to work out with within five miles. Opt into a few sports, post a callout for a morning run or a spin class, and people nearby who opted in get notified. Native iOS app and mobile web app on one API.

API endpoints: 63
conformance checks: 975

SwiftUI React Workers D1 KV Playwright

Open web app

Sheetwright

Concept

Brand and site for a Google Workspace consultancy that builds live Apps Script dashboards and automations, fed by Sheets or any system with an API, then hands them to the client’s own team. The hero dashboard syncs live, and each audit request is saved and emailed to the inbox.

sections, one page: 11
frameworks or build step: 0

HTML CSS vanilla JS Workers KV Email Routing

View demo

sheetwright.office-odds.com

Sheetwright landing page with a dashboard mock

Apps

Apps for iPhone and Mac, several of them built for the car: CarPlay, widgets, Live Activities and on-device vision.

Backseat Games

iPhone CarPlayTestFlight

Road-trip trivia read aloud through the car speakers while the family shouts answers. Nine themed packs for three age bands, plus Local Legends, which follows your route: drive I-45 and the questions turn to Huntsville and Sam Houston. Audio-first and driver-safe, with one-tap CarPlay controls.

original questions: 1,544
geo-tagged regions: 122
themed packs: 9

SwiftUI CarPlay templates AVSpeechSynthesizer StoreKit no backend

Backseat Games question screen with a countdown ring — Phone play screen and the CarPlay pack list.

Backseat Games pack list on a CarPlay screen — Phone play screen and the CarPlay pack list.

SwingTracker

iPhoneBuilt

A golf swing analyzer. It records in slow motion, finds the swing, locks a skeleton onto your body with on-device vision, draws a ball tracer and gives one honest coaching cue. It speaks the result aloud, so you never walk back to read the screen.

last TestFlight build: v1.0 (2)
auto-stop: 20 s

SwiftUI Vision AVFoundation on-device only

Careoke

iPhone CarPlayBuilt

Synced lyrics for whatever is playing on Spotify, on your CarPlay screen. Lyrics run through a widget and a Live Activity, scheduled line by line so they keep pace, with a timing nudge when a song drifts.

CarPlay surfaces: Widget + Live Activity

SwiftUI WidgetKit ActivityKit Spotify Web API

Source

Toll Tracker

iPhone CarPlayBuilt

Logs the tolls you drive through. Geofenced alerts at gantries it knows, starting with ten in DFW and learning more from each trip, a trip-level scan that prices tolls anywhere in the US through TollGuru, a business and personal split, and CSV or PDF export for taxes.

DFW gantries built in: 10
export: CSV + PDF

SwiftUI Core Location Core Data CarPlay StoreKit TollGuru API

Source

ForMax

macOSIn progress

A Mac diagnostic tool for Ford trucks, built against a 2026 F-150 Tremor. It reads trouble codes from every module plus standard OBD-II live data, and keeps the truck’s configuration under version control with snapshots, diffs and drift detection, which FORScan doesn’t offer.

tests, no hardware needed: 288
write paths: 0

Python today, Rust + Tauri planned UDS over CAN as-built read 0x22 DE00+n

Open data

Free to use, CORS enabled, cached at the edge.

Texas Toll API

Live

toll-api.tollmeapi.workers.dev

Every toll gantry, plaza and international toll bridge in Texas, compiled from OpenStreetMap, Wikipedia and 14 toll-authority sources into one dataset with coordinates, authority and rates. Filter by authority or road, or search outward from any point.

records: 1,155
with coordinates: 788
with rates: 511

Python scraper BeautifulSoup pdfplumber Cloudflare Worker

Try the API Source

# Gantries within 5 km of downtown Dallas
curl -G https://toll-api.tollmeapi.workers.dev/nearest \
  -d lat=32.78 -d lon=-96.80 -d radius_km=5

# GET /stats
{
  "total": 1155,
  "with_coords": 788,
  "with_rates": 511,
  "authority_count": 33,
  "authorities": {
    "NTTA": 359,
    "HCTRA": 317,
    "TxDOT": 133,
    …
  }
}

Mile markers

When each build got started.

Jul2023
NACHA Parser
An Angular app for reading ACH files. The seed of NACHA Navigator.
Mar2025
NACHA Navigator
The first public version, built on Replit.
Mar2026
Careoke
Lyrics on the CarPlay screen.
Apr2026
Texas Toll API Toll Tracker
A Texas toll dataset and a toll-logging app.
May2026
QuoteZap
AI quotes for solo service pros.
Jun2026
SwingTracker
First TestFlight build on June 27.
Jul2026
ScanTrail Backseat Games
Editable QR codes and road-trip trivia.
Aug2026
DateCard ForMax
A portable dating profile and a Mac tool for Ford trucks.
Sep2026
Sheetwright Tagalong
A consultancy concept and a fitness-buddy app.
Oct2026
Kaylor Ranks NACHA Navigator
A stats-only Top 25 and the payment-tools rebuild on Cloudflare.

Web products

NACHA Navigator

Kaylor Ranks

QuoteZap

ScanTrail

DateCard

Tagalong

Sheetwright

Apps

Backseat Games

SwingTracker

Careoke

Toll Tracker

ForMax

Open data

Texas Toll API

Mile markers

NACHA Parser

NACHA Navigator

Careoke

Texas Toll API · Toll Tracker

QuoteZap

SwingTracker

ScanTrail · Backseat Games

DateCard · ForMax

Sheetwright · Tagalong

Kaylor Ranks · NACHA Navigator

Texas Toll API Toll Tracker

ScanTrail Backseat Games

DateCard ForMax

Sheetwright Tagalong

Kaylor Ranks NACHA Navigator