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
Your diary, deposits and balances, client photos and portfolio in one calm place - plus a public page that always shows your open dates, so clients can book without the back-and-forth in your DMs.
Diary, clients, and money tracked in one place
A public page with your live availability and portfolio
Enquiries land in the app, not scattered across apps
A small hub of free browser games - daily word puzzles, score-prediction pools, and a calm block puzzle. New this autumn: six more daily word games, each with its own look, at games.cyber-jack.uk/dailies. 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.
GutLedger 2.7.10 on both stores
Two GutLedger updates went out to the App Store and Google Play. 2.7.9 added a list of past alerts, a search across your ledger, and alert wording that says when you actually ate the food instead of a fixed number of hours ago. 2.7.10 stopped the weekly summary telling people who already own Pro to upgrade. Both came straight from one user's emails.
Giving Letterly players a reason to come back
Most Letterly players play once and never return, so this update is about day two: a streak card with a countdown to the next letter, an optional 9am reminder, a share-as-image button, and plain tips for first-timers whose answers were rejected. The round and the scoring are unchanged.
Fresh puzzles for Rankle and Cluster
Rankle had started repeating old puzzles in early October. Rankle and Cluster now have a new puzzle lined up for every day into 2028, and the games hub has a "Today's dailies" strip showing which of Letterly, Cluster and Rankle you have played today.
Mileage calculator updated for 55p a mile
The free HMRC mileage calculator now uses 55p a mile for the first 10,000 business miles from 6 April 2026 (45p for earlier tax years), checked against GOV.UK.
Letterly's best day yet
Letterly had its biggest day so far: 54 rounds played against a usual 20, and 37 of those were people who had never played before. It has now had 2,126 rounds from 726 players in 53 countries. Almost all of the growth came from being listed in daily-puzzle directories rather than anything I did to the game. The honest part: those new players mostly did not come back the next day, and that is the thing to fix next.
Inkframe is live
The back office for tattoo artists came out of development and is running at inkframe.cyber-jack.uk - diary, deposits and balances, client photos, and a public artist page that shows an artist's real open dates so clients can enquire without the back-and-forth in DMs.
Took the review gating out of Nudge
Nudge originally used a star rating to send happy customers to Google and unhappy ones to a private form. That is review gating, it is against Google's policy, and it was quietly making the tool worse for the customer. It is gone: everyone now gets the same choice. I also fixed a privacy claim on the studio site that was more generous than the truth, and a couple of dead links.
Letterly stopped losing people's points
Answer validation runs through an AI check, and when that check hit its rate limit it silently capped good answers at the minimum score - so some players had been quietly under-scored for weeks. There is now a nightly sweep that re-checks and repairs those rounds, and a daily job that watches for the failure instead of waiting for someone to notice.
One sign-in across all the games
The games each had their own idea of who you were, which meant losing your streak if your browser cleared its storage. They now share a single email magic-link sign-in - no password, no account form - so a score follows you between devices and between games.
Killed the GutLedger video pipeline
For months an automated pipeline posted short-form gut-health videos to build an audience for GutLedger. It produced 942 posts and 142,000 views, and not one referral signup. Views are not users, so it was switched off rather than left running to look busy. Writing this down because a public log that only lists wins is not a log.
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.
Settle on the App Store
Settle, the FODMAP-aware meal planner, went live on the App Store: free, with an optional one-off £2.99 Pro unlock. It is not on Android yet.
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. (It later pivoted into Inkframe, a back-office tool for tattoo artists.)
SEO tool pages across the apps
Added free utility pages on each app site: GutLedger FODMAP food checker, a free HMRC mileage calculator, ListLedger shopping templates.
Shoji landing page live
Calm block puzzle game site published. Browser version playable.
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.
ListLedger launched
Started the shared shopping and household list app in mid-April and had it live on the App Store a week later. Built it because every existing list app wanted an account and a subscription.
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.
GutLedger first release
IBS diary for Android shipped. 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 [email protected].
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. The one exception is a shared list or household in ListLedger, which has to sync through a server so the people you share with can see it - that carries your list contents and a household ID, and nothing else. 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 October 2026: GutLedger and ListLedger are live on the App Store and Google Play, Settle is live on the App Store (not on Android yet), Inkframe is live on the web, and there are twelve free browser games at games.cyber-jack.uk, including six daily word games at games.cyber-jack.uk/dailies/. The log above is the honest version of this answer.
Can I suggest a feature or report a bug?
Please do. Email [email protected] 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.
