Each has a free plan or free experiment. Most also sell paid features, higher limits or premium content. Start on the free option; a paid trial is different and can renew into a subscription.
Do I need all eight tools?
No. Pick the tool that fits one task. Finish a small exercise before deciding whether another tool solves a different problem.
Can I trust the results?
Check facts, calculations and promises before using them. Source links help with verification, but a cited answer can still be wrong. Use our answer-checking checklist.
What should I practise with?
Start with fictional examples or information you are permitted to use in the selected tool. Check your organisation’s rules before adding work documents.