- TestReady: $9.99 one-time per mock. Eight-week study plan, daily tasks, and streaks designed to survive busy days. - IELTS Prep App (British Council): free, official practice tests, no streak system. - Magoosh IELTS: subscription video lessons, strong explanations. - IELTS Test Pro: free question banks, ad-supported. - E2 Test Prep: free plus paid tiers, genuinely good writing feedback. Sources: IELTS Streaks work because skipping feels like losing. Pick the app whose daily task takes 20 minutes, not two hours. A streak you keep beats a plan you abandon.