Tool round-ups that name the catch
7 lists covering 59 tools for coding practice, interview prep, certifications and the job hunt itself. Each entry carries the exact free-tier limit, the exact price in the currency the vendor charges, and one line on who it is not for. Where a figure was not published, we say that rather than guess it.
Last re-checked 24 Jul 2026 · oldest verification on the site 24 Jul 2026 · no affiliate links, no paid placements
All round-ups
Coding practice sites, ranked by what each is actually for
Ten sites, and they are not substitutes for each other. LeetCode is a searchable bank of 3,999 problems with no sequence; Codeforces is a competition with 11,311 problems and a rating that means something; Exercism is language fluency with a human reading your code. Picking the wrong one costs you months.
10 tools · checked 24 Jul 2026
SQL practice sites for analyst and data interviews
SQL practice splits cleanly in two: sites that teach you the language, and sites that drill you on interview questions from named companies. Mixing them up is why people spend a month on window functions and still freeze on a self-join. Both kinds are below, labelled.
7 tools · checked 24 Jul 2026
System design resources, from a free repo to a ₹49,999 cohort
The free material here is genuinely good — the System Design Primer has 359,000 GitHub stars and costs nothing — so the question is never whether to pay for access. It is whether you need someone to tell you what a good answer sounds like out loud, which is the one thing a repository cannot do and a ₹49,999 cohort can.
8 tools · checked 24 Jul 2026
Mock interview platforms, from free peer swaps to ₹15,000 sessions
There are three products hiding under one phrase. A peer swap costs nothing and teaches you to speak while thinking. An AI simulation is endlessly available and never surprised by anything. A session with someone who has actually rejected candidates for that role costs from about $50 and is the only one that tells you why you would have failed. Choose by which of those you are short of.
8 tools · checked 24 Jul 2026
Resume builders, ordered by whether the free plan really exports
Almost every resume builder is free to use and not free to finish. You write for forty minutes, hit download, and find out that the free plan exports plain text, or expires in seven days, or allows three PDFs total. Here is what each one actually lets you leave with.
8 tools · checked 24 Jul 2026
Free certifications: which ones are actually free at the end
Half the certifications marketed as free are free to study and paid to certify. Microsoft will teach you for nothing and charge US$165 at the exam. NPTEL’s IIT courses cost nothing until the proctored paper. freeCodeCamp charges nothing at any point. That distinction is the whole page.
8 tools · checked 24 Jul 2026
Remote job boards, and how much of each you can see for free
Two things separate these boards, and neither is the number on the homepage. The first is how much of the inventory a non-paying visitor can see — one of the best-known names here shows you 0.4% of it. The second is whether "remote" means remote-from-India or remote-within-the-United-States, which most boards will not tell you until you open the listing.
10 tools · checked 24 Jul 2026
How a tool earns a place
- — Somebody opened it. Pricing page included. The date that happened is printed next to the entry and is moved only by a checker that successfully re-fetched the page.
- — Exact numbers or nothing. A free tier is described by its actual limit, a price by its actual figure and currency. No “affordable”, no “generous free plan”.
- — Every entry names who it is wrong for. A list where everything is excellent tells you nothing and is the easiest kind to fake.
- — Nothing is bought. No affiliate links, no commissions, no paid slots; where a competitor beats us, the page says so.
- — Dead links fail the build, and any entry unverified for 90 days goes back on the review list.
Questions people actually ask
How are these lists put together?
Every tool on every list was opened and read before it was written about — pricing page included — and each entry records the date that happened. We record the exact free-tier limit and the exact price with currency, and where a figure was not published we say so instead of estimating it. Across 7 lists that covers 59 tools.
Does OnJob earn money from the links on these pages?
No. There are no affiliate links, no referral commissions and no paid placements anywhere in these round-ups. The link pipeline that tags paid links rel="sponsored" has an empty sponsored-host list because there is nothing to tag. OnJob makes money from its own subscriptions, not from sending you elsewhere.
How often do these lists get updated?
A checker re-fetches every outbound link, follows redirects, and flags any entry whose verification is more than 90 days old. Dead links fail the build. An entry it cannot reach keeps its old date and stays on the review list, so the date printed next to a tool always means somebody confirmed it was still there.
Do you recommend competitors over OnJob?
On these pages, often. A round-up where the publisher always wins is worthless, so where a competitor is genuinely the better answer for a use case we say which one and why. OnJob appears only where it does something the alternatives do not.
Then go and use it on something
Practice and certificates only pay off against real openings. Create a free OnJob profile to see a match score on every job before you apply.