Membership
Upgrade
Free covers every course. Plus adds every lab challenge and something new every week; Premium adds a mentor.
Free
Everything you need to learn.
৳0forever
- Every course, lesson, podcast episode and simulator
- Checkpoints, quizzes, practice tasks and flashcard review
- Auto-checked SQL and JavaScript exercises
- Final exams, capstones and verifiable certificates
- All 10 labs: System Design Studio, SQL, Code, Data, Product & BA, Security, QA, DevOps, AI and Finance, with templates for real work (up to 5 saved projects per lab)
- The daily incident drill and the first challenge campaign in every lab
- XP, streaks, weekly leagues, Builder rank and a public profile
- Notes, bookmarks and progress synced across devices
Kolom Plus
Every challenge, bigger simulations, unlimited projects and something new every week.
৳100per 30 days, no automatic renewal
- Everything in Free
- Every challenge campaign in every lab, and the full incident drill library
- Unlimited saved projects in every lab, with version history
- The full case-study and template libraries
- Bigger simulations: designs beyond 12 parts, load tests beyond 10,000 requests a second, chaos and failure injection
- Larger data imports (CSV up to 20 MB)
- AI hints and reviews in the labs, with a monthly fair-use limit
- A weekly issue on the This week page: 3 to 5 tasks in the labs and a project of the week with criteria
- The weekly e-mail with each new issue (switch it off any time)
With a mentor
Kolom Premium
Plus, and people: a mentor every two weeks, seminars and meet-ups.
৳1,500per 30 days, no automatic renewal
- Everything in Plus
- A 1-hour 1:1 session with a mentor every 2 weeks: pick a department, and we suggest a mentor from your progress (or pick one of two others); move it until 24 hours before
- A live seminar every month, with questions
- Invitations to in-person gatherings, with a waiting list when places run out
| Feature | Free | Plus | Premium |
|---|---|---|---|
| Learn | |||
| Every course, lesson, podcast and simulator | Included in Free | Included in Plus | Included in Premium |
| Quizzes, exercises, flashcards, exams and certificates | Included in Free | Included in Plus | Included in Premium |
| XP, streaks, leagues and the Builder rank | Included in Free | Included in Plus | Included in Premium |
| Tools | |||
| Open labs (5 saved projects each), the daily drill and the first campaign in every lab | Included in Free | Included in Plus | Included in Premium |
| Every challenge campaign and the full incident drill library | – | Included in Plus | Included in Premium |
| Unlimited saved projects with version history | – | Included in Plus | Included in Premium |
| Case-study and template libraries | – | Included in Plus | Included in Premium |
| Bigger simulations and larger data imports (20 MB) | – | Included in Plus | Included in Premium |
| AI hints and reviews in the labsmonthly fair-use limit | – | Included in Plus | Included in Premium |
| Every week | |||
| A weekly issue: 3 to 5 lab tasks and a project of the weekprojects count towards the Gold rank | – | Included in Plus | Included in Premium |
| The weekly e-mail with each new issueswitch it off any time | – | Included in Plus | Included in Premium |
| People | |||
| A 1-hour 1:1 mentor session every 2 weekspick a department; we suggest a mentor from your progress, or pick one of two others | – | – | Included in Premium |
| A live seminar every monthsome are open to Plus too | – | – | Included in Premium |
| Invitations to in-person gatherings | – | – | Included in Premium |
How to upgrade
Pay with bKash
Send the amount shown at checkout, then enter the TrxID. Someone on our team checks it, usually within a few hours, and e-mails you. Nothing renews by itself; pay again to add more days.
Use your coins
Coins you earn on the site pay part of the price, or all of it. They are held while a payment waits for a check and come back if it is not approved. Earn coins.
Add a coupon
Type a coupon code at checkout to see the discount before you pay. When coins and a coupon cover the whole price, the plan starts at once with no bKash step.
Finish half a course
Complete half the lessons of any one course (and at least 5 lessons in all) and get your first month of Plus free. It comes once per account.