CertFuel is an adaptive learning platform for FINRA exam prep. It uses spaced repetition and adaptive algorithms to target your weak areas, with free SIE prep and premium Series 65 prep.
CertFuel is an adaptive learning platform that helps you pass your FINRA exams. With 4,000+ SIE and 5,800+ Series 65 practice questions, it uses adaptive algorithms to continuously identify your weak areas so every study session targets what matters most. Spaced repetition flashcards lock in knowledge by scheduling reviews based on your forgetting curves. The SIE exam prep is completely free forever, and once you land a job in the industry, CertFuel offers comprehensive Series 65 prep with an Exam Readiness Score that tells you exactly when you're ready to sit for the exam.
Who it is for
Candidates preparing for FINRA securities and futures exams, including the SIE and Series exams.
Problem it solves
Large exam syllabi make it difficult for learners to identify weak areas, retain material and judge when they are ready to test.
The solution
CertFuel adapts practice questions and spaced-repetition reviews to each learner’s weak areas and shows a live readiness score.
What makes it unique
The study plan continuously changes from performance data instead of giving every candidate the same fixed question sequence.
Features6 listed
Spaced repetition
Each flashcard is scheduled around your forgetting curve, so it shows up right before you forget. Retention up, study time down.
Adaptive drilling
The engine watches every miss and resurfaces your weak areas more often. Every session targets what you actually need.
Weighted by exam %
Take a full practice exam first.
Take a full practice exam every week.
Once a week, sit another timed practice exam. New weak units will surface as old ones improve. Re-rank your queue and run the loop again on whatever's at the top.
Book the real exam after three 75%+ practice exams in a row.
Real-exam scores tend to land within a few points of your last full practice exam. Three consecutive practice exams at 75% or above is the readiness signal. 80%+ if you want margin for a bad day.
Details
Built for
Candidates preparing for FINRA securities and futures exams, including the SIE and Series exams.
In IndieTools' mobile lab test on November 12, 2026, the CertFuel website scored 77 out of 100 (needs improvement). Total Blocking Time took 653 ms, rated poor. It placed #661 overall in the finalized week 2026-W45.
Measured (UTC)
LCPLargest Contentful Paint
1.09 s
Good
TBTTotal Blocking Time
653 ms
Poor
CLSCumulative Layout Shift
0.162
Needs improvement
FCPFirst Contentful Paint
1.09 s
Good
Ranked #661 overall in 2026-W45, best #3.
CertFuel lab metrics
Speed metrics for CertFuel, measured November 12, 2026
Metric
Result
Status
Trend
Mobile lab testMid-range phone on a throttled 4G connection, two runs averaged. Changes compare with the run on Nov 11.
Performance score
Needs improvementDown 16 points
77 / 100
Needs improvementDown 16 points
First Contentful PaintFCP
GoodAbout the same
1.09 s
GoodAbout the same
Largest Contentful PaintLCP
GoodAbout the same
1.09 s
GoodAbout the same
Speed IndexSI
GoodAbout the same
1.26 s
GoodAbout the same
Total Blocking TimeTBT
Poor589 ms slower
653 ms
Poor589 ms slower
Cumulative Layout ShiftCLS
Needs improvementAbout the same
0.162
Needs improvementAbout the same
Unthrottled observationsTimed on the test machine's own fast connection, so they read lower than the lab metrics above.
Page loadLoad
517 ms faster
603 ms
517 ms faster
Server responseTTFB
About the same
8 ms
About the same
CertFuel performance history
54 comparable mobile lab runs since September 27, 2026. Choose a metric and a range, then move along the line to read each run.
CertFuel Speed ranking
Weekly Speed standing for CertFuel
Weekly standingLatest finalized week 2026-W45. Bests cover the last 52 finalized weeks.
Stored lab observations from controlled test runs, not real-user Core Web Vitals or a guarantee of search rankings. Weekly standings remain attached to their finalized edition.Method psi-mobile-two-sample-mean-v1, 2 samples per reading. Lab results can vary between runs.
Model difference−13. DR4 is 13 points lower than DR3.
Measured · certfuel.com
What do DR4, DR3 and the model difference mean?
DR4:
Ahrefs' newer model. It gives more weight to links from sites with organic search traffic and rates a subdomain on its own links.
DR3:
The previous model, shown in the Ahrefs app until 1 December 2026.
Model difference:
DR4 minus DR3 for the same domain. The models calculate differently, so this is not growth or a drop; the “since” lines compare each model with itself.
