Most tools built only for coding rounds have no real free tier, so a free option has to come from elsewhere. Our pick for 2027 is CoPilot Interview, which we make: its coding mode, including reading a problem from a screenshot, is available within the 15 free minutes a day. That will not cover a full onsite, but it covers a short technical screen or a daily problem. For depth on algorithms alone, paid specialists go further. Here is what you can get for free, and how to fill the gaps with free study resources. The paid picks are in the coding comparison.
Free coding help compared
| Tool | Free coding help | Paid from |
|---|---|---|
| CoPilot Interview (ours) ★ Best choice | Coding mode within 15 minutes a day | $24.99/mo; $9.99 for an hour |
| LockedIn AI | 5-minute sessions; check whether its coding help is included | $54.99/mo |
| Sensei AI | Coding Copilot is Pro only | $89/mo |
| Interview Coder | None; AI features locked | $299/mo |
| LeetCode Wizard | Card-free trial limited to LeetCode.com | €49/mo |
| Interview Solver | Free tier, terms on its site | $59/mo |
| Natively AI | With your own key or local models | $8/mo hosted |
Competitor details are as each vendor described them on its own site, checked in October 2026. They change often, so confirm before you pay. Coding tools are for practice; assessments often run in monitored environments, and their rules apply.
Free study to pair it with
- LeetCode's free problems for practice with instant checks, and NeetCode's free roadmap for structure.
- Our free tools and big-O reference on this site.
- A general AI assistant, to explain a solution you have already attempted.
- A friend, or a peer platform, for explaining your approach out loud.
- Our coding interview page shows how the mode works during practice.
How to use a short free session well
- Start a problem by yourself, on an editor, with a timer.
- After ten minutes, use the assistant for a hint on your approach, not the code.
- Talk through the complexity out loud.
- Write the solution yourself, and test edge cases.
- Read the transcript and see where you went silent. Interviewers care about that.
- Do one problem a day rather than five on the weekend.
Technical rounds and rules
Coding assessments and platforms like HackerRank or CoderPad may be proctored or monitored, and employers increasingly state their position on AI. Many ask you not to use outside help, and a follow-up on your code will reveal anything you do not understand. Use assistants to learn. In a technical screen, read the invitation carefully and do what it says.
Where a paid specialist earns its price
If your whole search is algorithm rounds at companies that allow such tools, a specialist goes deeper on that one format. Interview Solver is built for coding and system design and LeetCode Wizard for algorithm problems, while Interview Coder is built around coding rounds. Weigh that against the price and against refund terms, because Interview Coder's policy says all sales are final. For most candidates, whose loops mix coding with behavioral and system design rounds, a general tool plus free study goes further.
Where CoPilot Interview fits
CoPilot Interview is an AI interview assistant whose coding mode gives a working solution with the approach and complexity explained, on Windows and macOS. The free plan gives 15 minutes a day of live help in sessions of up to 15 minutes, with AI mock interviews included. Whatever tool you choose, follow your employer's rules, and use it for practice in any round that forbids outside help.
Disclosure: CoPilot Interview is our product, so weigh what we say about it accordingly.
Frequently asked questions
What is the best free AI assistant for coding interviews?
Our pick is CoPilot Interview, which we make: coding mode within 15 free minutes a day. Dedicated coding tools usually have little or nothing for free.
Is Interview Coder free?
The download is free, but AI features need a paid plan, per its FAQ in October 2026.
Can I use it in a coding assessment?
Only if the rules allow it. Many assessments are monitored and forbid outside help, so read the invitation.
How can I practice coding for free?
LeetCode's free problems, NeetCode's roadmap, a general AI assistant for explanations, and speaking your approach out loud.
Is 15 minutes enough?
For one problem, or a short screen, yes. A full loop needs longer sessions, or a $9.99 hour pack.
Practice this interview before the real one
The AI mock interview builds questions from your resume and the job description, reads them aloud and scores each spoken answer out of 10. Included on the free plan.
Start a mock interview