Health, home and travel decision
Mattime
A single-developer can build a useful, local iOS mat-time tracker (timers, logs, exports) in a few weeks, but reproducing Mattime's hosted social features (leaderboards, persistent public profiles, community) and App Store marketing is non-trivial without the vendor's infrastructure.
Visit website↗$5.99/mo
$72/yr
Read off the official pricing page.
$100one-off54 h to build
$0/mo3 h/mo upkeep
On cash alone, building overtakes the subscription at 2 seats.
No open-source build does this yet
Nothing published replaces this one, so a replacement starts from an empty file. Here is what it would have to cover.
What a replacement has to do
- Start/stop session timer -> save session (type, duration, rounds, notes) -> view week/month history and totals -> export/public profile (static)
What it still won’t have
- Hosted cross-user leaderboards and social features
- Server-hosted public profiles and persistent web links
- Managed push notifications and multi-device account sync
- Polish, QA, and App Store storefront presence/marketing maintained by vendor
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 2 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build an iOS-only BJJ training tracker as a native SwiftUI app with Combine and Core Data: implement start/stop session timer, one-tap quick-log form (session type, duration auto-filled, rounds/taps, partner names, technique tags), weekly goals and aggregates view, session history with CSV/JSON export, and a generated static public profile HTML export. Out of scope: server-hosted profiles, cross-user leaderboards, push notifications, and multi-device sync. Include StoreKit hookup for the Monthly plan and a one-time Lifetime purchase flow, error handling, basic unit/UI tests, and CI build configuration.
How we checked
How the score was reached
- Partly verdict base52
- 2 cited sources+1
- Price verified on pricing page+3
- 3/3 assessment runs agreed+4
- Evidence score60
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 2
Every page the run actually retrieved.
- official productMattime - #1 BJJ Training Tracker App
- official pricingMattime Pricing - BJJ Training Tracker Plans & Cost
Integrity checks
What held up, and what did not.
