How Kept Identifies Your Items
When you scan an item, your photo travels through an encrypted connection to Kept's Cloudflare Worker proxy — never directly to a third party. The proxy forwards it to OpenAI's GPT-5.4 vision model, which runs two sequential AI calls:
- Call 1 — Identification: The AI reads visible details — player names, years, brand markings, set identifiers, mint marks, serial numbers, condition indicators — and returns a structured identification with a confidence level.
- Call 2 — Valuation: A second AI call estimates value across four condition tiers (Mint, Near Mint, Good, Fair/Poor) based on its training knowledge of the collectibles market.
The entire process completes in under 15 seconds. Photos are not used for AI training; OpenAI may keep them up to 30 days for safety monitoring, then deletes them.
Accuracy: What We're Good At, and Where We're Not
We ran a structured accuracy study across categories. These are real numbers — not marketing claims.
| Category | Avg ID Score | Avg Value Score | Avg Overall |
|---|---|---|---|
| Edge Cases | 97/100 | 97/100 | 97/100 |
| Stamps | 96/100 | 95/100 | 95.8/100 |
| Sports Cards | ~95/100 | ~72/100 | ~82/100 |
| Vinyl Records | 91/100 | 86/100 | 89.1/100 |
| Coins | ~88/100 | ~65/100 | ~75/100 |
| Toys / Figures | 84/100 | 72/100 | 79.2/100 |
| Trading Cards | 80/100 | 62/100 | 68.6/100 |
| Comics | 88/100 | 62/100 | 73.1/100 |
| Antiques | 72/100 | 45/100 | 58.0/100 |
| Art / Prints | 58/100 | 32/100 | 43.0/100 |
Best at
- Common/base versions of well-documented items (cards, coins, stamps)
- Items with clearly visible text (player names, years, mint marks)
- Recognising when it doesn't know (confidence gating)
Where accuracy varies
- Rare parallels, variants, and short prints
- Items without visible identifying text
- Niche or one-of-a-kind collectibles
- Condition estimates (lighting and angle affect results)
Your Data and Privacy
- Photos are stored in your private encrypted cloud account (Supabase) — protected by row-level security, only accessible by you
- Photos sent to the AI are used for that single scan only — not used for AI training; OpenAI may keep them up to 30 days for safety monitoring, then deletes them
- Your collection data is never sold, shared, or used for advertising
- Kept is subscription-only. No ads. Ever.
- Export your full collection as CSV or PDF at any time, free on all tiers
- Delete your account and all associated data from Settings at any time
Pro Tier: Real Market Data Coming Soon
All tiers currently use AI-estimated valuations drawn from GPT-5.4's training knowledge of the collectibles market.
Pro and Pro Max subscribers will soon receive values cross-referenced against real recent sold listings from PriceCharting and eBay — both of which track actual transaction prices for thousands of collectible categories.
All values — whether AI-estimated or market-enriched — will be clearly labeled by source so you always know which numbers come from AI training data and which come from live market transactions.
Who Built This
Kept is a solo-built app. It started because collectors — especially older ones planning their estates — deserve a private, honest tool that tells them what they own without pressuring them to sell. No marketplace, no social feed, no ads. Just a clear answer to "what do I have and what is it worth?"
Questions, concerns, or feedback: tj@kept-collections.com