Private tours
Your own guide, your own pace, priced per group rather than per person on most listings.
Prices run from $4 to $146, and half of the 13 priced listings cost $56 or less. Most take 4 hours to 6 hours. The best reviewed with at least 100 reviews is Hanoi: Private Walking Tour with Local Student (4.8 from 119 reviews).
For the operators we researched and recommend, see our food tours and cooking classes in Hanoi, or the experiences overview.