What the book costs.
Keep it
The whole book, offline.
$19$29
Once. Yours forever.
- PDF in colour, plus one per part
- EPUB for phones and e-readers
- The tested code
- No account needed to open them
14 days to change your mind
Everything
The book, plus a year of practice rounds.
$19a month
Billed $228 yearly · book included
- Everything in Keep it
- A practice round every week
- A full loop every month, scored
- Explain out loud; AI names what you skipped
- A score on the 8 things interviewers judge
Not open yet · no card today
Prove it
The practice rounds, month to month.
$29a month
Stop whenever you like
- The rounds, the loops and the score
- Book not included ($19 separately)
- $348 a year, against $228 yearly
Not open yet · no card today
Or read the whole book online, free
All 19 sections, 30 problems and 9 patterns. No card, no expiry.
Nothing you can read today ever moves behind a paywall.
Side by side
| Side by side | Free$0 | Keep it$19 once | Everything$228 a year | Prove it$29 a month |
|---|---|---|---|---|
| All 19 sections online | ✓ | ✓ | ✓ | ✓ |
| First 3 sections, no account | ✓ | ✓ | ✓ | ✓ |
| Highlights and notes | ✓ | ✓ | ✓ | ✓ |
| All 30 problems, auto-graded | ✓ | ✓ | ✓ | ✓ |
| 9 patterns to drill | ✓ | ✓ | ✓ | ✓ |
| PDF, EPUB and code | — | ✓ | ✓ | — |
| Weekly practice round | — | — | ✓ | ✓ |
| Monthly full loop, scored | — | — | ✓ | ✓ |
| Explain out loud, AI feedback | — | — | ✓ | ✓ |
| Score on 8 interview skills | — | — | ✓ | ✓ |
Questions
About paying
No. Keep it is one payment, and the files are yours, including every corrected version of this edition. The yearly and monthly plans are separate and not open yet.
No. All thirty problems and the pattern cards are free with an account. Buying adds the files to keep.
Write to contact@solvealgorithms.com. You should not pay twice for a book that had defects in it.
Ask for a refund within 14 days and you will get one, no questions.