What Cault
is building for you.
LEGO is the starting point. The vision is much broader: a financial platform capable of hosting any collection with official price sources. Pokémon TCG, Magic, Hot Wheels and more are coming. Here is where we stand.
Progress
15 milestones. 10 completed. V1 published and enhanced.
Infrastructure & Architecture
DoneFull stack, Supabase database, CI/CD GitHub Actions. The foundations.
Price & Catalogue APIs
DoneBrickLink (LEGO market) and Brickset (retail + LEGO dates) integration. On-demand 48h cache + 7d CRON strategy.
Web Design — Mockups
DoneMinimalist design system, mockups of all pages, validated design tokens.
Web MVP — Main screens
DoneDashboard, collection view, item detail, add/remove, semi-real-time ROI, tri-source prices.
Wishlists + History + Settings
DoneWishlists with alerts, full transaction history, user settings.
Advanced Financial Features
DoneInvestment ranking, evolution charts, advanced indicators (Sharpe, volatility), heatmap, wealth curve, portfolio health score.
Investor Tools
DoneCSV insurance report, fiscal export of disposals (P&L per year), price target on alerts, portfolio benchmark vs inflation.
Retirement Calendar + Market Intelligence
DoneV1Retirement page with buy signals for the next 180 days, urgency badge in sidebar, automated market blog and analyses.
Dark Mode, PWA & Accessibility
DoneFull dark mode (universe-aware). Installable PWA with service worker and offline mode. LEGO EAN barcode scan. WCAG AA accessibility audit. Issue reporting integrated into each item sheet.
Social Features, Rich Catalogue & Onboarding
DoneFull friends system: add by email, accept, manage. Read-only view of a friend's collection. Side-by-side comparison of two collections. Full detail sheet from the catalogue (market prices, minifigs, market comparison, one-click add) — viewable without owning the item. 7-day trial plan for new sign-ups (#51+).
iOS MVP
In progressNative Swift/SwiftUI app with all web MVP features. Push notifications for price alerts.
Android MVP
UpcomingNative Kotlin/Jetpack Compose app. Full iOS and Web parity.
Pokémon TCG — Full Integration
UpcomingFull catalogue by set and number. Near Mint prices in semi-real time via JustTCG. Conditions (Mint, NM, LP, MP, HP). Dashboard adapted to the card universe.
Magic: The Gathering + Playmobil + Hot Wheels
UpcomingMagic via TCGPlayer API. Playmobil via official catalogue. Hot Wheels via community references. Referral programme. Anonymised community stats.
Seller Pro Plan + Expansion
UpcomingProfessional plan for BrickLink/TCGPlayer sellers: stock management, margin per batch, accounting export. Exploration of new collections (Funko Pop, Comics, Sneakers).
CSV/JSON Import
UpcomingImport your existing collection from Excel, Brickset, Rebrickable or a Cault export. Templates provided per universe. Migration in minutes.
M6 — V1 published
Advanced financial features.
M6 marks the end of the V1 web. Cault is a complete financial analysis tool for serious collectors.
Investment performance ranking
DoneYour items sorted by ROI, absolute gain, or period performance.
Value evolution charts
DoneCurve of your total wealth and per collection over time.
Advanced indicators
DoneSharpe ratio, volatility, break-even — for collector-investors.
Performance heatmap
DoneCalendar view of price movements — spot seasonal patterns.
Portfolio health score
DoneA synthetic score — diversification, liquidity, performance — at a glance.
PDF report export
DoneFull portfolio report for your records or your advisor.
Future collections
Tomorrow, even more universes.
Cault was designed from the start to host any collection with official price sources. These universes are being explored — in priority order.
Pokémon TCG
Planned — M13
The next integrated collection. Near Mint prices in semi-real time via JustTCG, full catalogue by set and number.
Magic: The Gathering
Explored — M14
One of the largest card collector communities. Deep markets and very dynamic prices via TCGPlayer.
Playmobil
Explored — M14
A toy universe close to LEGO, with an active secondary market and a usable official catalogue.
Hot Wheels
Explored — M14
Very active collecting, many limited editions, well-documented secondary prices via community databases.
Funko Pop
Explored — M13
Mature secondary market with established data sources. Strong community demand for a tracking tool.
Comics & BD
Explored — M13
Very structured niche market (CGC, CBCS). Growing demand for a grading-aware tracking tool.
Your collection isn't listed? Tell us what you collect.
Suggest a collection →Our philosophy
What Cault will never do.
We have clear principles on what Cault should — and should not — be.
Official sources only
Every price comes from an official API (BrickLink, Brickset, JustTCG, Scryfall…). Never unverified data or fragile scraping.
Your data stays yours
Full export of your collection and transactions at any time. No lock-in. You can leave with all your data in CSV.
No marketplace
Cault helps you value your collection — not sell it. We take no commission and don't become an intermediary.
No unnecessary features
We build what collectors actually use. No artificial gamification, no social feed, no bloat.
Join Cault today.
Start with LEGO. Get all new collections from day one — Pokémon TCG, Magic and more.