Track food, symptoms, mood, sleep, and bowel movements. Spot trigger patterns over weeks. Generate read-only reports for your GP. All stored on your device, never synced to a server.
Real-time sync between household members. Barcode scanning. Per-shop price history so you know when something is on offer. Per-trip budgets that warn you before checkout. One-off unlock, no subscription.
Live household sync, no account required
Price history across Tesco, Asda, Aldi, Lidl and more
HMRC-ready reports for self-assessment. Auto-detects trip start and end. Splits work versus personal mileage with one tap. Built for UK rates and the UK tax year. No cloud sync, no data sharing. One-off unlock when it ships.
An honest companion app for the whole tattoo journey. Walks you through the lead-up to your appointment, lets you save the design photo, then guides healing day-by-day so you don't end up panic-Googling at 2am about whether the redness is normal.
Pre-appointment checklist: sleep, food, skin care, what to wear
Save your design and appointment details
Day-by-day healing reminders for the first 4 weeks
A small hub of free browser games - daily word puzzles, score-prediction pools, and a calm block puzzle. No sign-up, no app to install, no ads. Just open and play.
Letterly - one letter, ten categories, ninety seconds
A FODMAP-aware meal planner for people with sensitive guts. Paste any recipe URL - Settle pulls out the ingredients, flags Low/Medium/High FODMAP using the same database that powers GutLedger, and sends the week's shopping list straight to ListLedger. Built to fix the gap between knowing what you can't eat and actually planning meals around it.
Recipe import from any URL or share sheet (TikTok, Pinterest, Safari)
Auto Low/Medium/High FODMAP flags on every ingredient - free
Weekly plan view, one-tap export to ListLedger shopping
A public log so you can tell whether the studio is still alive. Most-recent first.
A toolkit for the high street
Built five small, embeddable web apps for local businesses: Snug (commission-free booking), Carte (allergen-aware digital menus), Slate (appointment booking), Tally (digital loyalty cards) and Nudge (review booster). One line of code to drop onto a shop's own site. See them all on the business apps page.
A hub of daily browser games
Letterly grew into a small hub of free daily games at games.cyber-jack.uk: Cluster (find four hidden groups), Rankle (put four things in order) and Spot On (call the scores in a pool with friends). No sign-up, no ads.
Letterly launched
Shipped a seventh app and the first pure-web one: Letterly, a daily word categories game. Same letter and same ten categories for everyone worldwide each day. Real-time originality scoring, private friend leagues, no account. Build to launch in a single weekend.
Dabbling in web design for small businesses
Started building modern, responsive websites for small UK businesses still stuck on dated, mobile-broken sites. Free concept redesign first, no obligation, hosted and looked after on a simple monthly plan. See examples and pricing on the web design page.
Settle announced
Starting a sixth app: Settle, a FODMAP-aware meal planner. Recipe URL import, auto Low/Medium/High flags, weekly plan, hand-off to ListLedger for the shop. Build kicks off this week.
Journal launched
Started a weekly journal documenting the studio in public: what's shipping, what's broken, real numbers. Honest, not marketing.
Studio newsletter on Brevo
Migrated newsletter and tester signups to a proper provider with one-click unsubscribe. No more "subscribe to a Discord ping".
Studio site relaunched
This page. Replaced the old single-card placeholder with a proper studio landing, structured data, and a public changelog.
Inkframe in development
Started building a tattoo lifecycle companion app: pre-appointment prep, design photo, day-by-day healing reminders. Coming soon.
SEO tool pages across the apps
Added free utility pages on each app site: GutLedger FODMAP food checker, Odomo mileage calculator, ListLedger shopping templates.
Shoji landing page live
Calm block puzzle game site published. Browser version playable. Android build coming soon.
Schema.org structured data on every app site
Organization, WebSite, MobileApplication and FAQPage JSON-LD shipped across all four landing sites. Better search results, AI-crawler friendly.
Odomo entered internal testing
UK mileage tracker for self-employed drivers - landing page and free mileage calculator live; the app itself is under internal test. Take a tester slot from the Odomo card above.
ListLedger to the Play Store
Shared shopping list app went live on Google Play. iOS link added to landing page.
GutLedger on the App Store
IBS food and symptom diary went live for iOS, alongside the existing Android build.
GutLedger paid Pro tier added
One-off in-app purchase for advanced reports, FODMAP severity tracking, and unlimited history. Free tier still does the core diary.
ListLedger first release
Shared shopping and household list app published on iOS. Built it because every existing list app wanted an account and a subscription.
GutLedger first release
IBS diary for Android shipped after months of testing with my own gut. Free, on-device, no account required.
Cyber-Jack studio formed
Decided to put the small apps under one roof instead of leaving them as scattered side projects. Bought the domain. Got serious.
About the studio
Cyber-Jack is a one-person studio. We build apps the way we'd want them used: small, fast, private, paid for once. No data harvesting, no engagement-bait, no surprise charges.
Every app is designed to work without an account. Your data lives on your device. We don't see it, store it, or sell it. If we ever change that, we'll tell you on this page first.
We work in public where we can. Each app has its own site with a privacy policy that explains exactly what it does and doesn't do, in plain English.
Common questions
Everything we get asked often. If your question isn't here, email hello@cyber-jack.uk.
Is Cyber-Jack really one person?
Yes. Every app, every landing page, every reply to support email is one human in the UK. Bigger studios with bigger budgets ship more, but a one-person studio means decisions are made by the person who has to live with them - which is why we don't add subscriptions, ads, or trackers we wouldn't want in our own apps.
How do you make money without subscriptions?
Optional one-off Pro unlocks. The free version of every app is fully usable - the unlock adds nice-to-haves. We'd rather sell once to a happy user than churn a recurring subscriber. Current prices are on each app's own site.
Are the apps actually private, or is that marketing?
Actually private. None of the apps require an account. Your data is stored on your device, not on any Cyber-Jack server. There is no Cyber-Jack server. The privacy policy on each app spells out exactly what each app does and doesn't do, in plain English.
Why are some apps Android-only?
Apple charges £99/year just to publish an iOS build, plus more for app review. For an indie studio shipping free games like Shoji, that's a real friction. Most apps go to Android first because the cost of being wrong is lower; iOS follows once an app proves it's wanted.
How often do new apps come out?
Roughly one new app every 6-12 weeks. As of mid-2026, GutLedger and ListLedger are live on stores, Odomo is in internal testing, Letterly and a small hub of daily browser games are live on the web, and Inkframe is being built. The pace depends on what's already shipped working as expected - support emails come first, new builds second.
How does the tester signup work?
Each in-development app card has a "Become a tester" form. Drop your email, hit Sign up, and you're added to a list specific to that app in Brevo (the email service we use). We email you only when there's a build to try (TestFlight on iOS, Closed Beta on Google Play, or a direct APK link). One email per app per launch step. Every email has a one-click unsubscribe link - it removes you from that specific list immediately.
Can I suggest a feature or report a bug?
Please do. Email hello@cyber-jack.uk for general feedback, or use the support page on the relevant app's site for app-specific issues. Every email gets read and usually replied to within a day. Real feature requests have shipped within weeks.
Is there a roadmap?
The "What's shipped lately" timeline above is the public roadmap. Anything past that is a maybe. We don't pre-announce features so we can change direction when something better comes up.
What does "on-device first" actually mean?
It means the data lives on your phone. If you delete the app, the data is gone. If you change phones without backing up, the data is gone. That's the trade-off for not having a Cyber-Jack server holding your information. Each app has its own way to export data so you can keep your own backups.
Get in touch
For app questions, bug reports, ideas, or business: email hello@cyber-jack.uk. A real person reads every message and usually replies within a day.
For app-specific support, use the support page on the relevant app's site - we keep separate inboxes per app so nothing falls through the cracks:
Anonymous analytics?We'd like to use Google Analytics to count anonymous visits with IP addresses masked. No personal data, no advertising cookies, no third-party sharing. Your call.
