Your collection.
Your wealth.
Real-time market prices 1, automatic ROI, alerts — all in one.
Total value
3 914 €
+37,1 %UCS Millennium Falcon
+88 %Charizard Holo Base Set
+180 %Black Lotus Alpha
+320 %Manage and value your collections in real time 1.
Your collection.Your wealth.
Cault centralises all your collections, connects official price sources, and calculates your ROI in real time 1 — automatically.
Real-time value¹
Connected to official price sources. Prices refresh automatically, no manual entry. You always know what your collection is worth
12-month progression
Purchases, sales and refreshes tracked on the chart. See if your value grows, stagnates or drops. Spot the right moments to buy or sell
Complete journal
Every operation auto-archived — purchases, sales, refreshes. Zero manual entry, everything is logged. Find any transaction in seconds
Overview
LEGO
Estimated total collection value
3 914 €
↗ +37,1% vs purchaseROI
+37,1%
LEGO
2 814 €
22 SETS
640 €
18 FIGS
TECHNIC
460 €
5 SETS
Purchase total
2 856 €
Total sales
1 120 €
Realized profit
+420 € ↗
Items
47
Value progression
Market value · adjusted per refresh
Monthly cash-flow
Journal (recent activity)
•••Sale UCS Falcon
Full sale · Apr 12
Purchase Charizard
Purchase · Apr 4
Sale Black Lotus
Full sale · Mar 28
Market update
Refresh · Mar 27
Themes
Status
Age
Black Lotus Alpha — best ROI in the collection at +320%
Portfolio health score
Auto-calculated ROI
Real purchase price vs market value, per item and collection. Recalculated at every refresh, always current. Instantly identify your best and worst positions
Monthly cash-flow
Each purchase and sale allocated to its month. Visualize investment months vs selling months. Plan purchases with a clear view of your budget
Portfolio health score
ROI, profitable items and unrealized gain aggregated into a score out of 100. A synthetic and honest indicator of your portfolio. In one number, you know if your collection performs or stagnates
The dashboard is the entry. Price alerts, integrated catalogue, full history — everything is waiting for you.
See featuresWhat Cault does for you
Your collection viewed as
a portfolio.
All the metrics of an investor, designed for a collector.
UCS Millennium Falcon
#75192 · LEGO · Sealed
Charizard Holo Base Set
Real-time prices 1
3 prices. 1 view.
0 effort.
Every item shows what you paid, the official retail price, and the current market value. All calculated automatically, always up to date.
- Real-time¹ market prices — LEGO, Pokémon TCG, Magic…
- Official retail price and purchase price, by universe
- Official sources: BrickLink, Brickset, JustTCG
Automatic ROI
Know exactly
what you earned.
Cault calculates your ROI in real time 1 — per item, per collection, and across your entire portfolio. No more Excel formulas.
- Global and per-collection ROI
- Unrealized gains calculated automatically
- Ranking of your best investments
Included in the Pro plan.
Total value
3 914 €
Best ROI
Black Lotus Alpha
+320 %Charizard Holo Base Set
+180 %UCS Millennium Falcon
+88 %Price alerts
2 near thresholdUCS Millennium Falcon
94 %Charizard Holo Base Set
80 %Black Lotus Alpha
70 %Smart alerts
Sell at the right time.
Not by chance.
Set a target price for each item. Cault watches the market and alerts you when the time is right — to sell or to buy.
- Alert when an item reaches your target price
- Integrated catalogue retirement dates to anticipate price rises
- Never miss a selling opportunity again
Included in the Pro plan.
Community
Rare or common?
You'll know.
Every item shows its rarity among Cault collectors, the average price paid, and which friends already own it — free, no opt-in needed.
- Rarity & average price paid on every item
- See which friends already own a set
- Optional ranking against other collectors — off by default
Set rarity
Rare set12 / 249 collectors own this set
Average price paid
742 €
In wishlists
37
3 friends own this set
Official real-time data 1
Sealed · New · Used — the world reference for the LEGO secondary market.
LEGO.com retail prices (DE + US), official launch and retirement dates.
Real-time¹ Near Mint prices — the reference for Pokémon cards.
2k+
Items tracked
113+
Collectors
311k €
Total tracked value
Comparison
Cault vs the tools you already use.
Each platform excels in its domain. Cault is the only tool that adds a complete financial layer — for any collection.
| Cault | BrickLink | Brickset | Rebrickable | BrickEconomy | BrickFact | Excel | |
|---|---|---|---|---|---|---|---|
| Real-time market prices¹ | Supported | Partial | Not available | Not available | Partial | Partial | Not available |
| LEGO.com retail price | Supported | Not available | Partial | Not available | Partial | Partial | Not available |
| Automatic ROI calculation | Supported | Not available | Not available | Not available | Partial | Partial | Partial |
| Global portfolio view | Supported | Not available | Not available | Partial | Not available | Not available | Partial |
| Financial catalogue sheet | Supported | Partial | Partial | Not available | Partial | Partial | Not available |
| Price alerts | Supported | Not available | Not available | Not available | Not available | Not available | Not available |
| Transaction history | Supported | Not available | Not available | Not available | Not available | Not available | Partial |
| Automatic updates | Supported | Not available | Not available | Not available | Partial | Partial | Not available |
| Web app | Supported | Supported | Supported | Supported | Supported | Not available | Partial |
| Native mobile app | Partial | Supported | Partial | Supported | Supported | Supported | Not available |
| Free | Partial | Partial | Supported | Supported | Supported | Supported | Supported |
Real-time market prices¹
LEGO.com retail price
Automatic ROI calculation
Global portfolio view
Financial catalogue sheet
Price alerts
Transaction history
Automatic updates
Web app
Native mobile app
Free
FAQ
Frequently asked questions.
Is it really free?
Cault is in launch — payments are not yet available. The first 50 users get full free access: lifetime for the first 10, then 5, 4, 2 and 1 year(s) depending on sign-up order. Beyond 50, paid plans will open soon.
What is an item?
An item is any collectible you own or want to track. Today: a LEGO set (sealed, opened or used), a minifig, or a Pokémon TCG card.
How are prices fetched?
Cault connects to BrickLink (LEGO market prices) and Brickset (LEGO.com retail prices) APIs. Updated on demand or every 48h.
Which universes are supported?
LEGO (sets and minifigs) at launch. More universes are coming per the roadmap — Pokémon TCG, Magic: The Gathering, Hot Wheels, Funko Pop…
Does Cault replace BrickLink or Brickset?
No — Cault builds on them. These platforms remain community references. Cault adds the financial layer and portfolio view they lack.
Is my data secure?
Yes. Your data is hosted in France, on a private server (self-hosted Supabase, encrypted PostgreSQL) — not on shared cloud infrastructure. Your data is only accessible to you.
Stop guessing.
Start knowing.
Free — 1 collection, 20 items. Paid plans coming soon. No credit card.