Comparison
Free OA Mock Test Platforms Compared
"OA mock test platform" covers a few genuinely different things: Ediky offers free, one-click timed mock tests matched to a specific company's real format; HackerRank is often the actual platform real OAs run on, so practicing there builds interface familiarity; InterviewBit combines practice with structured interview-prep tracks; Pramp offers free live peer-to-peer mock interviews (a different format entirely, not a timed written OA); and Codility is mostly what companies use to administer real OAs rather than a self-serve practice tool, though familiarity with its interface still has value.
Ediky
This is EdikyOne-click OA mock tests matched to a specific company's real question count, time limit, and topic weighting.
- + Presets for 5 companies (Amazon, Google, Microsoft, Cisco, Uber) with real timing/topic weighting, not a generic timed test
- + Manual OA Builder for assembling a custom timed test filtered by any company in the bank, even without a named preset
- + Completely free, no account tier restrictions
- − Only 5 companies have a dedicated one-click preset — others rely on the manual builder against a smaller tagged pool
- − No live/human interview component — purely self-timed practice
HackerRank
A broad assessment platform that many companies also use to administer real OAs.
- + Practicing here means practicing the actual interface some real OAs run on
- + Free practice questions across a wide range of domains, not just DSA
- − Not organized around "simulate company X's specific OA format" the way a dedicated mock-test builder is
- − Editorial/explanatory content is thinner than dedicated learning platforms
InterviewBit
Practice problems combined with structured interview-prep tracks and mentorship programs.
- + Structured, guided tracks rather than just a flat problem list
- + Combines DSA practice with broader interview-prep content
- − Some of the more structured/mentored offerings sit behind a paid program
- − Not built around simulating a specific company's OA timing/format
Pramp
Free live, peer-to-peer mock interviews — a genuinely different format from a timed written OA.
- + Real human interaction and verbal communication practice, which no timed written test can substitute for
- + Completely free, peer-matched
- − Not a written OA simulation at all — different skill (live technical communication, not timed independent problem-solving)
- − Quality depends on who you're matched with
Codility
Primarily the assessment engine companies license to administer real OAs, not a self-serve practice platform.
- + If your target company's real OA runs on Codility, its practice mode (where available) builds direct interface familiarity
- − Not designed as a general practice destination — access to practice content is limited outside of an actual assessment invite
- − No broad free problem bank the way dedicated practice platforms have
What to actually use, and when
For format-accurate timed practice against a specific target company, Ediky's presets are built for exactly that. For general interface familiarity with the tools some real OAs actually run on, HackerRank and (where accessible) Codility practice content are worth a session each. For the verbal/communication side of interviews — which no timed written OA tests — Pramp fills a real, different gap. These aren't fully substitutable for each other; using more than one, for different reasons, is the honest recommendation.
Start a company-formatted OA mock test
Free, one-click presets matched to real company timing and topic weighting.
See company OA guides