Premium practice modes and what stays free
The teaching is the free product: the daily drill, the model page that writes out every equation, every fault page and the diagnostic guide, forever. Premium is the depth of practice: every family, the exam, the classroom projection mode, two faults at once, and the record of what you have learned to read.
What Premium adds
- Practice on every fault family: air metering, fuel supply, exhaust and sensors, coolant temperature
- The timed exam, 20 cases in 40 minutes across every family and tier
- Projection mode for class, with reveal on click and a printable case sheet with the answer
- The two fault tier, where two faults share one engine
- Your history: every case you worked, with accuracy per fault and per cue
Weekly, yearly and lifetime plans are available.
Free forever
- The daily drill of 5 cases, the same for everyone and new every day
- Practice on the unmetered air family, clean and noisy tiers
- The model page, which writes out every equation the cases are generated from
- Every fault page, with its fingerprint table and example chart
- The diagnostic guide and the FAQ
- Export and import of your progress file as JSON
Choose a plan
Loading plans.
The weekly and yearly plans renew automatically and can be cancelled anytime from the link in your receipt email. Access is tied to this browser; keep your receipt email for account recovery. Already subscribed elsewhere? Restore access.
Frequently asked questions
What stays free?
The teaching, forever. The daily drill of 5 cases that renews at midnight UTC, practice on the unmetered air family, the model page, every fault page with its fingerprint table, the diagnostic guide, and export of your progress file. No account is needed and nothing you answer leaves your browser.
What does Premium add?
Depth of practice. Every practice family, the timed exam of 20 cases in 40 minutes, projection mode for class with a printable case sheet, the two fault tier, and your history with accuracy per fault and per cue.
Are the cases different in Premium?
No. Every case comes from the same engine model and the same seed gives the same case for everyone. Premium opens more families and modes. It hides no explanation and changes no grading.
Is a score here a qualification?
No. It is a self assessment on this browser. It is not issued or verified by anyone. TrimCase is not affiliated with ASE, the ASE Education Foundation, or any certification or accrediting body.
How is my access stored?
Purchases are handled by RevenueCat and Stripe. An anonymous purchase id is kept in this browser so TrimCase recognises your Premium on this device. Keep your receipt email for recovery.
I already bought Premium on another browser or device, how do I get it here?
Open the restore page and paste the access code shown on this Premium page, or the one from your receipt. Premium moves to this browser instantly.
Can I cancel, and can I get a refund?
Yes. The weekly and yearly plans renew automatically and can be cancelled anytime from the link in your receipt email; lifetime is a one time payment. Refunds are covered by the Refunds section of the terms of use, which is the one place the refund window is stated.
Lost your access code?
Your code is shown on this page whenever you have Premium here, and it is in your purchase receipt email. If you cannot find it, reply to your receipt email from the address you paid with. Your purchase is tied to it and access can be recovered from there.